Matthias Andreas Benkard | b5d657a | 2022-02-03 21:14:30 +0100 | [diff] [blame] | 1 | // SPDX-FileCopyrightText: © 2021 Matthias Andreas Benkard <code@mail.matthias.benkard.de> |
| 2 | // |
| 3 | // SPDX-License-Identifier: LGPL-3.0-or-later |
| 4 | |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 5 | package eu.mulk.jgvariant.core; |
| 6 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 7 | import static java.lang.Math.max; |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 8 | import static java.nio.ByteOrder.BIG_ENDIAN; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 9 | import static java.nio.ByteOrder.LITTLE_ENDIAN; |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 10 | import static java.nio.charset.StandardCharsets.UTF_8; |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 11 | import static java.util.Objects.requireNonNullElse; |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 12 | import static java.util.stream.Collectors.toMap; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 13 | |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 14 | import com.google.errorprone.annotations.Immutable; |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 15 | |
| 16 | import java.io.ByteArrayOutputStream; |
| 17 | import java.io.IOException; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 18 | import java.lang.reflect.InvocationTargetException; |
| 19 | import java.lang.reflect.RecordComponent; |
| 20 | import java.nio.ByteBuffer; |
| 21 | import java.nio.ByteOrder; |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 22 | import java.nio.channels.Channels; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 23 | import java.nio.charset.Charset; |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 24 | import java.text.ParseException; |
Matthias Andreas Benkard | 2802f2b | 2023-12-10 15:42:19 +0100 | [diff] [blame^] | 25 | import java.util.*; |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 26 | import java.util.Map.Entry; |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 27 | import java.util.function.Function; |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 28 | import java.util.function.Predicate; |
| 29 | import java.util.function.UnaryOperator; |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 30 | |
Matthias Andreas Benkard | 25b7f90 | 2021-12-17 06:02:11 +0100 | [diff] [blame] | 31 | import org.apiguardian.api.API; |
| 32 | import org.apiguardian.api.API.Status; |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 33 | import org.jetbrains.annotations.NotNull; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 34 | import org.jetbrains.annotations.Nullable; |
| 35 | |
| 36 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 37 | * Type class for decodable types. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 38 | * |
| 39 | * <p>Use the {@code of*} family of constructor methods to acquire a suitable {@link Decoder} for |
| 40 | * the type you wish to decode. |
| 41 | * |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 42 | * <p><strong>Example</strong> |
| 43 | * |
| 44 | * <p>To parse a GVariant of type {@code "a(si)"}, which is an array of pairs of {@link String} and |
| 45 | * {@code int}, you can use the following code: |
| 46 | * |
Matthias Andreas Benkard | 0239d32 | 2022-04-15 20:21:37 +0200 | [diff] [blame] | 47 | * {@snippet lang="java" : |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 48 | * record ExampleRecord(String s, int i) {} |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 49 | * |
| 50 | * var decoder = |
| 51 | * Decoder.ofArray( |
| 52 | * Decoder.ofStructure( |
| 53 | * ExampleRecord.class, |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 54 | * Decoder.ofString(UTF_8), |
| 55 | * Decoder.ofInt().withByteOrder(LITTLE_ENDIAN))); |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 56 | * |
Matthias Andreas Benkard | 0239d32 | 2022-04-15 20:21:37 +0200 | [diff] [blame] | 57 | * byte[] bytes; |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 58 | * List<ExampleRecord> example = decoder.decode(ByteBuffer.wrap(bytes)); |
Matthias Andreas Benkard | 0239d32 | 2022-04-15 20:21:37 +0200 | [diff] [blame] | 59 | * } |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 60 | * |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 61 | * @param <T> the type that the {@link Decoder} can decode. |
| 62 | */ |
Matthias Andreas Benkard | 25b7f90 | 2021-12-17 06:02:11 +0100 | [diff] [blame] | 63 | @API(status = Status.EXPERIMENTAL) |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 64 | @Immutable |
| 65 | @SuppressWarnings({"ImmutableListOf", "InvalidInlineTag", "java:S1610", "UnescapedEntity"}) |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 66 | public abstract class Decoder<T> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 67 | |
| 68 | private Decoder() {} |
| 69 | |
| 70 | /** |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 71 | * Decodes a {@link ByteBuffer} holding a serialized GVariant into a value of type {@code T}. |
| 72 | * |
Matthias Andreas Benkard | 3f13b66 | 2021-12-18 18:57:37 +0100 | [diff] [blame] | 73 | * <p><strong>Note:</strong> Due to the way the GVariant serialization format works, it is |
| 74 | * important that the start and end boundaries of the passed byte slice correspond to the actual |
| 75 | * start and end of the serialized value. The format does generally not allow for the dynamic |
| 76 | * discovery of the end of the data structure. |
| 77 | * |
| 78 | * @param byteSlice a byte slice holding a serialized GVariant. |
| 79 | * @return the deserialized value. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 80 | * @throws java.nio.BufferUnderflowException if the byte buffer is shorter than the requested |
| 81 | * data. |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 82 | * @throws IllegalArgumentException if the serialized GVariant is ill-formed |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 83 | */ |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 84 | public abstract @NotNull T decode(ByteBuffer byteSlice); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 85 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 86 | /** |
| 87 | * Encodes a value of type {@code T} into a {@link ByteBuffer} holding a serialized GVariant. |
| 88 | * |
| 89 | * @param value the value to serialize. |
| 90 | * @return a {@link ByteBuffer} holding the serialized value. |
| 91 | */ |
| 92 | public final ByteBuffer encode(T value) { |
| 93 | var byteWriter = new ByteWriter(); |
| 94 | encode(value, byteWriter); |
| 95 | return byteWriter.toByteBuffer(); |
| 96 | } |
| 97 | |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 98 | abstract byte alignment(); |
| 99 | |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 100 | abstract @Nullable Integer fixedSize(); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 101 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 102 | abstract void encode(T value, ByteWriter byteWriter); |
| 103 | |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 104 | final boolean hasFixedSize() { |
| 105 | return fixedSize() != null; |
| 106 | } |
| 107 | |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 108 | /** |
| 109 | * Switches the input {@link ByteBuffer} to a given {@link ByteOrder} before reading from it. |
| 110 | * |
| 111 | * @param byteOrder the byte order to use. |
| 112 | * @return a new, decorated {@link Decoder}. |
| 113 | */ |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 114 | public final Decoder<T> withByteOrder(ByteOrder byteOrder) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 115 | return new ByteOrderFixingDecoder(byteOrder); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 116 | } |
| 117 | |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 118 | /** |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 119 | * Creates a new {@link Decoder} from an existing one by applying a function to the result. |
| 120 | * |
| 121 | * @param function the function to apply. |
| 122 | * @return a new, decorated {@link Decoder}. |
| 123 | * @see java.util.stream.Stream#map |
| 124 | */ |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 125 | public final <U> Decoder<U> map(Function<@NotNull T, @NotNull U> decodingFunction, Function<@NotNull U, @NotNull T> encodingFunction) { |
| 126 | return new MappingDecoder<>(decodingFunction, encodingFunction); |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | /** |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 130 | * Creates a new {@link Decoder} from an existing one by applying a function to the input. |
| 131 | * |
| 132 | * @param function the function to apply. |
| 133 | * @return a new, decorated {@link Decoder}. |
| 134 | * @see java.util.stream.Stream#map |
| 135 | */ |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 136 | public final Decoder<T> contramap(UnaryOperator<ByteBuffer> decodingFunction, UnaryOperator<ByteBuffer> encodingFunction) { |
| 137 | return new ContramappingDecoder(decodingFunction, encodingFunction); |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Creates a new {@link Decoder} that delegates to one of two other {@link Decoder}s based on a |
| 142 | * condition on the input {@link ByteBuffer}. |
| 143 | * |
| 144 | * @param selector the predicate to use to determine the decoder to use. |
| 145 | * @return a new {@link Decoder}. |
| 146 | */ |
| 147 | public static <U> Decoder<U> ofPredicate( |
| 148 | Predicate<ByteBuffer> selector, Decoder<U> thenDecoder, Decoder<U> elseDecoder) { |
| 149 | return new PredicateDecoder<>(selector, thenDecoder, elseDecoder); |
| 150 | } |
| 151 | |
| 152 | /** |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 153 | * Creates a {@link Decoder} for an {@code Array} type. |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 154 | * |
| 155 | * @param elementDecoder a {@link Decoder} for the elements of the array. |
| 156 | * @param <U> the element type. |
| 157 | * @return a new {@link Decoder}. |
| 158 | */ |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 159 | public static <U> Decoder<List<U>> ofArray(Decoder<U> elementDecoder) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 160 | return new ArrayDecoder<>(elementDecoder); |
| 161 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 162 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 163 | /** |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 164 | * Creates a {@link Decoder} for a {@code Dictionary} type. |
| 165 | * |
| 166 | * @param keyDecoder a {@link Decoder} for the key component of the dictionary entry. |
| 167 | * @param valueDecoder a {@link Decoder} for the value component of the dictionary entry. |
| 168 | * @return a new {@link Decoder}. |
| 169 | */ |
| 170 | public static <K, V> Decoder<Map<K, V>> ofDictionary( |
| 171 | Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 172 | return new DictionaryDecoder<>(keyDecoder, valueDecoder); |
| 173 | } |
| 174 | |
| 175 | /** |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 176 | * Creates a {@link Decoder} for an {@code Array} type of element type {@code byte} into a |
| 177 | * primitive {@code byte[]} array. |
| 178 | * |
| 179 | * @return a new {@link Decoder}. |
| 180 | */ |
| 181 | public static Decoder<byte[]> ofByteArray() { |
| 182 | return new ByteArrayDecoder(); |
| 183 | } |
| 184 | |
| 185 | /** |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 186 | * Creates a {@link Decoder} for a {@code Maybe} type. |
| 187 | * |
| 188 | * @param elementDecoder a {@link Decoder} for the contained element. |
| 189 | * @param <U> the element type. |
| 190 | * @return a new {@link Decoder}. |
| 191 | */ |
| 192 | public static <U> Decoder<Optional<U>> ofMaybe(Decoder<U> elementDecoder) { |
| 193 | return new MaybeDecoder<>(elementDecoder); |
| 194 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 195 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 196 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 197 | * Creates a {@link Decoder} for a {@code Structure} type, decoding into a {@link Record}. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 198 | * |
| 199 | * @param recordType the {@link Record} type that represents the components of the structure. |
| 200 | * @param componentDecoders a {@link Decoder} for each component of the structure. |
| 201 | * @param <U> the {@link Record} type that represents the components of the structure. |
| 202 | * @return a new {@link Decoder}. |
| 203 | */ |
| 204 | public static <U extends Record> Decoder<U> ofStructure( |
| 205 | Class<U> recordType, Decoder<?>... componentDecoders) { |
| 206 | return new StructureDecoder<>(recordType, componentDecoders); |
| 207 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 208 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 209 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 210 | * Creates a {@link Decoder} for a {@code Structure} type, decoding into a {@link List}. |
| 211 | * |
| 212 | * <p>Prefer {@link #ofStructure(Class, Decoder[])} if possible, which is both more type-safe and |
| 213 | * more convenient. |
| 214 | * |
| 215 | * @param componentDecoders a {@link Decoder} for each component of the structure. |
| 216 | * @return a new {@link Decoder}. |
| 217 | */ |
| 218 | public static Decoder<Object[]> ofStructure(Decoder<?>... componentDecoders) { |
| 219 | return new TupleDecoder(componentDecoders); |
| 220 | } |
| 221 | |
| 222 | /** |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 223 | * Creates a {@link Decoder} for a {@code Dictionary Entry} type, decoding into a {@link |
| 224 | * Map.Entry}. |
| 225 | * |
| 226 | * @param keyDecoder a {@link Decoder} for the key component of the dictionary entry. |
| 227 | * @param valueDecoder a {@link Decoder} for the value component of the dictionary entry. |
| 228 | * @return a new {@link Decoder}. |
| 229 | */ |
| 230 | public static <K, V> Decoder<Map.Entry<K, V>> ofDictionaryEntry( |
| 231 | Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 232 | return new DictionaryEntryDecoder<>(keyDecoder, valueDecoder); |
| 233 | } |
| 234 | |
| 235 | /** |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 236 | * Creates a {@link Decoder} for the {@link Variant} type. |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 237 | * |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 238 | * <p>The contained {@link Object} can be of one of the following types: |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 239 | * |
| 240 | * <ul> |
| 241 | * <li>{@link Boolean} |
| 242 | * <li>{@link Byte} |
| 243 | * <li>{@link Short} |
| 244 | * <li>{@link Integer} |
| 245 | * <li>{@link Long} |
| 246 | * <li>{@link String} |
| 247 | * <li>{@link Optional} (a GVariant {@code Maybe} type) |
| 248 | * <li>{@link List} (a GVariant array) |
Matthias Andreas Benkard | a66b73d | 2021-12-18 19:15:52 +0100 | [diff] [blame] | 249 | * <li>{@code Object[]} (a GVariant structure) |
Matthias Andreas Benkard | d6a25d1 | 2021-12-28 01:13:58 +0100 | [diff] [blame] | 250 | * <li>{@link java.util.Map} (a dictionary) |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 251 | * <li>{@link java.util.Map.Entry} (a dictionary entry) |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 252 | * <li>{@link Variant} (a nested variant) |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 253 | * </ul> |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 254 | * |
| 255 | * @return a new {@link Decoder}. |
| 256 | */ |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 257 | public static Decoder<Variant> ofVariant() { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 258 | return new VariantDecoder(); |
| 259 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 260 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 261 | /** |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 262 | * Creates a {@link Decoder} for the {@code boolean} type. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 263 | * |
| 264 | * @return a new {@link Decoder}. |
| 265 | */ |
| 266 | public static Decoder<Boolean> ofBoolean() { |
| 267 | return new BooleanDecoder(); |
| 268 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 269 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 270 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 271 | * Creates a {@link Decoder} for the 8-bit {@code byte} type. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 272 | * |
| 273 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 274 | * result of this method. |
| 275 | * |
| 276 | * @return a new {@link Decoder}. |
| 277 | */ |
| 278 | public static Decoder<Byte> ofByte() { |
| 279 | return new ByteDecoder(); |
| 280 | } |
| 281 | |
| 282 | /** |
| 283 | * Creates a {@link Decoder} for the 16-bit {@code short} type. |
| 284 | * |
| 285 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 286 | * result of this method. |
| 287 | * |
| 288 | * @return a new {@link Decoder}. |
| 289 | */ |
| 290 | public static Decoder<Short> ofShort() { |
| 291 | return new ShortDecoder(); |
| 292 | } |
| 293 | |
| 294 | /** |
| 295 | * Creates a {@link Decoder} for the 32-bit {@code int} type. |
| 296 | * |
| 297 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 298 | * result of this method. |
| 299 | * |
| 300 | * @return a new {@link Decoder}. |
| 301 | */ |
| 302 | public static Decoder<Integer> ofInt() { |
| 303 | return new IntegerDecoder(); |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * Creates a {@link Decoder} for the 64-bit {@code long} type. |
| 308 | * |
| 309 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 310 | * result of this method. |
| 311 | * |
| 312 | * @return a new {@link Decoder}. |
| 313 | */ |
| 314 | public static Decoder<Long> ofLong() { |
| 315 | return new LongDecoder(); |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * Creates a {@link Decoder} for the {@code double} type. |
| 320 | * |
| 321 | * @return a new {@link Decoder}. |
| 322 | */ |
| 323 | public static Decoder<Double> ofDouble() { |
| 324 | return new DoubleDecoder(); |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * Creates a {@link Decoder} for the {@link String} type. |
| 329 | * |
| 330 | * <p><strong>Note:</strong> While GVariant does not prescribe any particular encoding, {@link |
| 331 | * java.nio.charset.StandardCharsets#UTF_8} is the most common choice. |
| 332 | * |
Matthias Andreas Benkard | 3f13b66 | 2021-12-18 18:57:37 +0100 | [diff] [blame] | 333 | * @param charset the {@link Charset} the string is encoded in. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 334 | * @return a new {@link Decoder}. |
| 335 | */ |
| 336 | public static Decoder<String> ofString(Charset charset) { |
| 337 | return new StringDecoder(charset); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | private static int align(int offset, byte alignment) { |
| 341 | return offset % alignment == 0 ? offset : offset + alignment - (offset % alignment); |
| 342 | } |
| 343 | |
| 344 | private static int getIntN(ByteBuffer byteSlice) { |
| 345 | var intBytes = new byte[4]; |
| 346 | byteSlice.get(intBytes, 0, Math.min(4, byteSlice.limit())); |
| 347 | return ByteBuffer.wrap(intBytes).order(LITTLE_ENDIAN).getInt(); |
| 348 | } |
| 349 | |
| 350 | @SuppressWarnings("java:S3358") |
| 351 | private static int byteCount(int n) { |
| 352 | return n < (1 << 8) ? 1 : n < (1 << 16) ? 2 : 4; |
| 353 | } |
| 354 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 355 | private static int computeFramingOffsetSize(int elementsRelativeEnd, List<Integer> framingOffsets) { |
| 356 | // Determining the framing offset size requires trial and error. |
| 357 | int framingOffsetSize; |
| 358 | for (framingOffsetSize = 0;; framingOffsetSize = max(1, framingOffsetSize << 1)) { |
| 359 | if (elementsRelativeEnd + framingOffsetSize* framingOffsets.size() >= 1 << (8*framingOffsetSize)) { |
| 360 | continue; |
| 361 | } |
| 362 | |
| 363 | if (framingOffsetSize > 4) { |
| 364 | throw new IllegalArgumentException("too many framing offsets"); |
| 365 | } |
| 366 | |
| 367 | return framingOffsetSize; |
| 368 | } |
| 369 | } |
| 370 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 371 | private static class ArrayDecoder<U> extends Decoder<List<U>> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 372 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 373 | private final Decoder<U> elementDecoder; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 374 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 375 | ArrayDecoder(Decoder<U> elementDecoder) { |
| 376 | this.elementDecoder = elementDecoder; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 377 | } |
| 378 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 379 | @Override |
| 380 | public byte alignment() { |
| 381 | return elementDecoder.alignment(); |
| 382 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 383 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 384 | @Override |
| 385 | @Nullable |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 386 | public Integer fixedSize() { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 387 | return null; |
| 388 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 389 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 390 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 391 | public @NotNull List<U> decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 392 | List<U> elements; |
| 393 | |
| 394 | var elementSize = elementDecoder.fixedSize(); |
| 395 | if (elementSize != null) { |
| 396 | // A simple C-style array. |
| 397 | elements = new ArrayList<>(byteSlice.limit() / elementSize); |
| 398 | for (int i = 0; i < byteSlice.limit(); i += elementSize) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 399 | var element = elementDecoder.decode(slicePreservingOrder(byteSlice, i, elementSize)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 400 | elements.add(element); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 401 | } |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 402 | } else if (byteSlice.limit() == 0) { |
| 403 | // A degenerate zero-length array of variable width. |
| 404 | elements = List.of(); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 405 | } else { |
| 406 | // An array with aligned elements and a vector of framing offsets in the end. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 407 | int framingOffsetSize = byteCount(byteSlice.limit()); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 408 | int lastFramingOffset = |
| 409 | getIntN(byteSlice.slice(byteSlice.limit() - framingOffsetSize, framingOffsetSize)); |
| 410 | int elementCount = (byteSlice.limit() - lastFramingOffset) / framingOffsetSize; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 411 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 412 | elements = new ArrayList<>(elementCount); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 413 | int position = 0; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 414 | for (int i = 0; i < elementCount; i++) { |
| 415 | int framingOffset = |
| 416 | getIntN( |
| 417 | byteSlice.slice(lastFramingOffset + i * framingOffsetSize, framingOffsetSize)); |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 418 | elements.add( |
| 419 | elementDecoder.decode( |
| 420 | slicePreservingOrder(byteSlice, position, framingOffset - position))); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 421 | position = align(framingOffset, alignment()); |
| 422 | } |
| 423 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 424 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 425 | return elements; |
| 426 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 427 | |
| 428 | @Override |
| 429 | void encode(List<U> value, ByteWriter byteWriter) { |
| 430 | if (elementDecoder.hasFixedSize()) { |
| 431 | for (var element : value) { |
| 432 | elementDecoder.encode(element, byteWriter); |
| 433 | } |
| 434 | } else { |
| 435 | // Variable-width arrays are encoded with a vector of framing offsets in the end. |
| 436 | ArrayList<Integer> framingOffsets = new ArrayList<>(value.size()); |
| 437 | int startOffset = byteWriter.position(); |
| 438 | for (var element : value) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 439 | // Align the element. |
| 440 | var lastRelativeEnd = byteWriter.position() - startOffset; |
| 441 | byteWriter.write(new byte[align(lastRelativeEnd, alignment()) - lastRelativeEnd]); |
| 442 | |
| 443 | // Encode the element. |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 444 | elementDecoder.encode(element, byteWriter); |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 445 | |
| 446 | // Record the framing offset of the element. |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 447 | var relativeEnd = byteWriter.position() - startOffset; |
| 448 | framingOffsets.add(relativeEnd); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | // Write the framing offsets. |
| 452 | int framingOffsetSize = computeFramingOffsetSize(byteWriter.position() - startOffset, framingOffsets); |
| 453 | for (var framingOffset : framingOffsets) { |
| 454 | byteWriter.writeIntN(framingOffset, framingOffsetSize); |
| 455 | } |
| 456 | } |
| 457 | } |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 458 | } |
| 459 | |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 460 | private static class DictionaryDecoder<K, V> extends Decoder<Map<K, V>> { |
| 461 | |
| 462 | private final ArrayDecoder<Map.Entry<K, V>> entryArrayDecoder; |
| 463 | |
| 464 | DictionaryDecoder(Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 465 | this.entryArrayDecoder = |
| 466 | new ArrayDecoder<>(new DictionaryEntryDecoder<>(keyDecoder, valueDecoder)); |
| 467 | } |
| 468 | |
| 469 | @Override |
| 470 | public byte alignment() { |
| 471 | return entryArrayDecoder.alignment(); |
| 472 | } |
| 473 | |
| 474 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 475 | @Nullable |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 476 | public Integer fixedSize() { |
| 477 | return entryArrayDecoder.fixedSize(); |
| 478 | } |
| 479 | |
| 480 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 481 | public @NotNull Map<K, V> decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 482 | List<Map.Entry<K, V>> entries = entryArrayDecoder.decode(byteSlice); |
Matthias Andreas Benkard | 2802f2b | 2023-12-10 15:42:19 +0100 | [diff] [blame^] | 483 | Map<K, V> result = new LinkedHashMap<>(); |
| 484 | for (var entry : entries) { |
| 485 | result.put(entry.getKey(), entry.getValue()); |
| 486 | } |
| 487 | return result; |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 488 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 489 | |
| 490 | @Override |
| 491 | void encode(Map<K, V> value, ByteWriter byteWriter) { |
| 492 | entryArrayDecoder.encode(value.entrySet().stream().toList(), byteWriter); |
| 493 | } |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 494 | } |
| 495 | |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 496 | private static class ByteArrayDecoder extends Decoder<byte[]> { |
| 497 | |
| 498 | private static final int ELEMENT_SIZE = 1; |
| 499 | |
| 500 | @Override |
| 501 | public byte alignment() { |
| 502 | return ELEMENT_SIZE; |
| 503 | } |
| 504 | |
| 505 | @Override |
| 506 | @Nullable |
| 507 | Integer fixedSize() { |
| 508 | return null; |
| 509 | } |
| 510 | |
| 511 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 512 | public byte @NotNull [] decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 513 | // A simple C-style array. |
| 514 | byte[] elements = new byte[byteSlice.limit() / ELEMENT_SIZE]; |
| 515 | byteSlice.get(elements); |
| 516 | return elements; |
| 517 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 518 | |
| 519 | @Override |
| 520 | void encode(byte[] value, ByteWriter byteWriter) { |
| 521 | byteWriter.write(value); |
| 522 | } |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 523 | } |
| 524 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 525 | private static class MaybeDecoder<U> extends Decoder<Optional<U>> { |
| 526 | |
| 527 | private final Decoder<U> elementDecoder; |
| 528 | |
| 529 | MaybeDecoder(Decoder<U> elementDecoder) { |
| 530 | this.elementDecoder = elementDecoder; |
| 531 | } |
| 532 | |
| 533 | @Override |
| 534 | public byte alignment() { |
| 535 | return elementDecoder.alignment(); |
| 536 | } |
| 537 | |
| 538 | @Override |
| 539 | @Nullable |
| 540 | Integer fixedSize() { |
| 541 | return null; |
| 542 | } |
| 543 | |
| 544 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 545 | public @NotNull Optional<U> decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 546 | if (!byteSlice.hasRemaining()) { |
| 547 | return Optional.empty(); |
| 548 | } else { |
| 549 | if (!elementDecoder.hasFixedSize()) { |
| 550 | // Remove trailing zero byte. |
| 551 | byteSlice.limit(byteSlice.limit() - 1); |
| 552 | } |
| 553 | |
| 554 | return Optional.of(elementDecoder.decode(byteSlice)); |
| 555 | } |
| 556 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 557 | |
| 558 | @Override |
| 559 | void encode(Optional<U> value, ByteWriter byteWriter) { |
| 560 | if (value.isEmpty()) { |
| 561 | return; |
| 562 | } |
| 563 | |
| 564 | elementDecoder.encode(value.get(), byteWriter); |
| 565 | if (!elementDecoder.hasFixedSize()) { |
| 566 | byteWriter.write((byte) 0); |
| 567 | } |
| 568 | } |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | private static class StructureDecoder<U extends Record> extends Decoder<U> { |
| 572 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 573 | private final Class<U> recordType; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 574 | private final TupleDecoder tupleDecoder; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 575 | |
| 576 | StructureDecoder(Class<U> recordType, Decoder<?>... componentDecoders) { |
| 577 | var recordComponents = recordType.getRecordComponents(); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 578 | if (componentDecoders.length != recordComponents.length) { |
| 579 | throw new IllegalArgumentException( |
| 580 | "number of decoders (%d) does not match number of structure components (%d)" |
| 581 | .formatted(componentDecoders.length, recordComponents.length)); |
| 582 | } |
| 583 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 584 | this.recordType = recordType; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 585 | this.tupleDecoder = new TupleDecoder(componentDecoders); |
| 586 | } |
| 587 | |
| 588 | @Override |
| 589 | public byte alignment() { |
| 590 | return tupleDecoder.alignment(); |
| 591 | } |
| 592 | |
| 593 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 594 | public @Nullable Integer fixedSize() { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 595 | return tupleDecoder.fixedSize(); |
| 596 | } |
| 597 | |
| 598 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 599 | public @NotNull U decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 600 | Object[] recordConstructorArguments = tupleDecoder.decode(byteSlice); |
| 601 | |
| 602 | try { |
| 603 | var recordComponentTypes = |
| 604 | Arrays.stream(recordType.getRecordComponents()) |
| 605 | .map(RecordComponent::getType) |
| 606 | .toArray(Class<?>[]::new); |
| 607 | var recordConstructor = recordType.getDeclaredConstructor(recordComponentTypes); |
| 608 | return recordConstructor.newInstance(recordConstructorArguments); |
| 609 | } catch (NoSuchMethodException |
| 610 | | InstantiationException |
| 611 | | IllegalAccessException |
| 612 | | InvocationTargetException e) { |
| 613 | throw new IllegalStateException(e); |
| 614 | } |
| 615 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 616 | |
| 617 | @Override |
| 618 | void encode(U value, ByteWriter byteWriter) { |
| 619 | try { |
| 620 | var components = recordType.getRecordComponents(); |
| 621 | List<Object> componentValues = new ArrayList<>(components.length); |
| 622 | for (var component : components) { |
| 623 | var accessor = component.getAccessor(); |
| 624 | var componentValue = accessor.invoke(value); |
| 625 | componentValues.add(componentValue); |
| 626 | } |
| 627 | tupleDecoder.encode(componentValues.toArray(), byteWriter); |
| 628 | } catch (IllegalAccessException | InvocationTargetException e) { |
| 629 | throw new IllegalStateException(e); |
| 630 | } |
| 631 | } |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 632 | } |
| 633 | |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 634 | @SuppressWarnings("Immutable") |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 635 | private static class TupleDecoder extends Decoder<Object[]> { |
| 636 | |
| 637 | private final Decoder<?>[] componentDecoders; |
| 638 | |
| 639 | TupleDecoder(Decoder<?>... componentDecoders) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 640 | this.componentDecoders = componentDecoders; |
| 641 | } |
| 642 | |
| 643 | @Override |
| 644 | public byte alignment() { |
| 645 | return (byte) Arrays.stream(componentDecoders).mapToInt(Decoder::alignment).max().orElse(1); |
| 646 | } |
| 647 | |
| 648 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 649 | public @Nullable Integer fixedSize() { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 650 | int position = 0; |
| 651 | for (var componentDecoder : componentDecoders) { |
| 652 | var fixedComponentSize = componentDecoder.fixedSize(); |
| 653 | if (fixedComponentSize == null) { |
| 654 | return null; |
| 655 | } |
| 656 | |
| 657 | position = align(position, componentDecoder.alignment()); |
| 658 | position += fixedComponentSize; |
| 659 | } |
| 660 | |
| 661 | if (position == 0) { |
| 662 | return 1; |
| 663 | } |
| 664 | |
| 665 | return align(position, alignment()); |
| 666 | } |
| 667 | |
| 668 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 669 | public Object @NotNull [] decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 670 | int framingOffsetSize = byteCount(byteSlice.limit()); |
| 671 | |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 672 | var objects = new Object[componentDecoders.length]; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 673 | |
| 674 | int position = 0; |
| 675 | int framingOffsetIndex = 0; |
| 676 | int componentIndex = 0; |
| 677 | for (var componentDecoder : componentDecoders) { |
| 678 | position = align(position, componentDecoder.alignment()); |
| 679 | |
| 680 | var fixedComponentSize = componentDecoder.fixedSize(); |
| 681 | if (fixedComponentSize != null) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 682 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 683 | componentDecoder.decode( |
| 684 | slicePreservingOrder(byteSlice, position, fixedComponentSize)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 685 | position += fixedComponentSize; |
| 686 | } else { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 687 | if (componentIndex == componentDecoders.length - 1) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 688 | // The last component never has a framing offset. |
| 689 | int endPosition = byteSlice.limit() - framingOffsetIndex * framingOffsetSize; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 690 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 691 | componentDecoder.decode( |
| 692 | slicePreservingOrder(byteSlice, position, endPosition - position)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 693 | position = endPosition; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 694 | } else { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 695 | int framingOffset = |
| 696 | getIntN( |
| 697 | byteSlice.slice( |
| 698 | byteSlice.limit() - (1 + framingOffsetIndex) * framingOffsetSize, |
| 699 | framingOffsetSize)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 700 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 701 | componentDecoder.decode( |
| 702 | slicePreservingOrder(byteSlice, position, framingOffset - position)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 703 | position = framingOffset; |
| 704 | ++framingOffsetIndex; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 705 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 706 | } |
| 707 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 708 | ++componentIndex; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 709 | } |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 710 | |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 711 | return objects; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 712 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 713 | |
| 714 | @Override |
| 715 | @SuppressWarnings("unchecked") |
| 716 | void encode(Object[] value, ByteWriter byteWriter) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 717 | // The unit type is encoded as a single zero byte. |
| 718 | if (value.length == 0) { |
| 719 | byteWriter.write((byte) 0); |
| 720 | return; |
| 721 | } |
| 722 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 723 | int startOffset = byteWriter.position(); |
| 724 | ArrayList<Integer> framingOffsets = new ArrayList<>(value.length); |
| 725 | for (int i = 0; i < value.length; ++i) { |
| 726 | var componentDecoder = (Decoder<Object>) componentDecoders[i]; |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 727 | |
| 728 | // Align the element. |
| 729 | var lastRelativeEnd = byteWriter.position() - startOffset; |
| 730 | byteWriter.write(new byte[align(lastRelativeEnd, componentDecoder.alignment()) - lastRelativeEnd]); |
| 731 | |
| 732 | // Encode the element. |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 733 | componentDecoder.encode(value[i], byteWriter); |
| 734 | |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 735 | // Record the framing offset of the element if it is of variable size. |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 736 | var fixedComponentSize = componentDecoders[i].fixedSize(); |
| 737 | if (fixedComponentSize == null && i < value.length - 1) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 738 | var relativeEnd = byteWriter.position() - startOffset; |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 739 | framingOffsets.add(relativeEnd); |
| 740 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | // Write the framing offsets in reverse order. |
| 744 | int framingOffsetSize = computeFramingOffsetSize(byteWriter.position() - startOffset, framingOffsets); |
| 745 | for (int i = framingOffsets.size() - 1; i >= 0; --i) { |
| 746 | byteWriter.writeIntN(framingOffsets.get(i), framingOffsetSize); |
| 747 | } |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 748 | |
| 749 | // Pad the structure to its alignment if it is of fixed size. |
| 750 | if (fixedSize() != null) { |
| 751 | var lastRelativeEnd = byteWriter.position() - startOffset; |
| 752 | byteWriter.write(new byte[align(lastRelativeEnd, alignment()) - lastRelativeEnd]); |
| 753 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 754 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 755 | } |
| 756 | |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 757 | private static class DictionaryEntryDecoder<K, V> extends Decoder<Map.Entry<K, V>> { |
| 758 | |
| 759 | private final TupleDecoder tupleDecoder; |
| 760 | |
| 761 | DictionaryEntryDecoder(Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 762 | this.tupleDecoder = new TupleDecoder(keyDecoder, valueDecoder); |
| 763 | } |
| 764 | |
| 765 | @Override |
| 766 | public byte alignment() { |
| 767 | return tupleDecoder.alignment(); |
| 768 | } |
| 769 | |
| 770 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 771 | public @Nullable Integer fixedSize() { |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 772 | return tupleDecoder.fixedSize(); |
| 773 | } |
| 774 | |
| 775 | @Override |
| 776 | @SuppressWarnings("unchecked") |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 777 | public Map.@NotNull Entry<K, V> decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 778 | Object[] components = tupleDecoder.decode(byteSlice); |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 779 | return Map.entry((K) components[0], (V) components[1]); |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 780 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 781 | |
| 782 | @Override |
| 783 | void encode(Entry<K, V> value, ByteWriter byteWriter) { |
| 784 | tupleDecoder.encode(new Object[] {value.getKey(), value.getValue()}, byteWriter); |
| 785 | } |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 786 | } |
| 787 | |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 788 | private static class VariantDecoder extends Decoder<Variant> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 789 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 790 | @Override |
| 791 | public byte alignment() { |
| 792 | return 8; |
| 793 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 794 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 795 | @Override |
| 796 | @Nullable |
| 797 | Integer fixedSize() { |
| 798 | return null; |
| 799 | } |
| 800 | |
| 801 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 802 | public @NotNull Variant decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 803 | for (int i = byteSlice.limit() - 1; i >= 0; --i) { |
| 804 | if (byteSlice.get(i) != 0) { |
| 805 | continue; |
| 806 | } |
| 807 | |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 808 | var dataBytes = slicePreservingOrder(byteSlice, 0, i); |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 809 | var signatureBytes = byteSlice.slice(i + 1, byteSlice.limit() - (i + 1)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 810 | |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 811 | Signature signature; |
| 812 | try { |
| 813 | signature = Signature.parse(signatureBytes); |
| 814 | } catch (ParseException e) { |
| 815 | throw new IllegalArgumentException(e); |
| 816 | } |
| 817 | |
| 818 | return new Variant(signature, signature.decoder().decode(dataBytes)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 819 | } |
| 820 | |
| 821 | throw new IllegalArgumentException("variant signature not found"); |
| 822 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 823 | |
| 824 | @Override |
| 825 | void encode(Variant value, ByteWriter byteWriter) { |
| 826 | value.signature().decoder().encode(value.value(), byteWriter); |
| 827 | byteWriter.write((byte) 0); |
| 828 | byteWriter.write(value.signature().toString().getBytes(UTF_8)); |
| 829 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 830 | } |
| 831 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 832 | private static class BooleanDecoder extends Decoder<Boolean> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 833 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 834 | @Override |
| 835 | public byte alignment() { |
| 836 | return 1; |
| 837 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 838 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 839 | @Override |
| 840 | public Integer fixedSize() { |
| 841 | return 1; |
| 842 | } |
| 843 | |
| 844 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 845 | public @NotNull Boolean decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 846 | return byteSlice.get() != 0; |
| 847 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 848 | |
| 849 | @Override |
| 850 | void encode(Boolean value, ByteWriter byteWriter) { |
| 851 | byteWriter.write(Boolean.TRUE.equals(value) ? (byte) 1 : (byte) 0); |
| 852 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 853 | } |
| 854 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 855 | private static class ByteDecoder extends Decoder<Byte> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 856 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 857 | @Override |
| 858 | public byte alignment() { |
| 859 | return 1; |
| 860 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 861 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 862 | @Override |
| 863 | public Integer fixedSize() { |
| 864 | return 1; |
| 865 | } |
| 866 | |
| 867 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 868 | public @NotNull Byte decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 869 | return byteSlice.get(); |
| 870 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 871 | |
| 872 | @Override |
| 873 | void encode(Byte value, ByteWriter byteWriter) { |
| 874 | byteWriter.write(value); |
| 875 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 876 | } |
| 877 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 878 | private static class ShortDecoder extends Decoder<Short> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 879 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 880 | @Override |
| 881 | public byte alignment() { |
| 882 | return 2; |
| 883 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 884 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 885 | @Override |
| 886 | public Integer fixedSize() { |
| 887 | return 2; |
| 888 | } |
| 889 | |
| 890 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 891 | public @NotNull Short decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 892 | return byteSlice.getShort(); |
| 893 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 894 | |
| 895 | @Override |
| 896 | void encode(Short value, ByteWriter byteWriter) { |
| 897 | byteWriter.write(value); |
| 898 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 899 | } |
| 900 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 901 | private static class IntegerDecoder extends Decoder<Integer> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 902 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 903 | @Override |
| 904 | public byte alignment() { |
| 905 | return 4; |
| 906 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 907 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 908 | @Override |
| 909 | public Integer fixedSize() { |
| 910 | return 4; |
| 911 | } |
| 912 | |
| 913 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 914 | public @NotNull Integer decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 915 | return byteSlice.getInt(); |
| 916 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 917 | |
| 918 | @Override |
| 919 | void encode(Integer value, ByteWriter byteWriter) { |
| 920 | byteWriter.write(value); |
| 921 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 922 | } |
| 923 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 924 | private static class LongDecoder extends Decoder<Long> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 925 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 926 | @Override |
| 927 | public byte alignment() { |
| 928 | return 8; |
| 929 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 930 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 931 | @Override |
| 932 | public Integer fixedSize() { |
| 933 | return 8; |
| 934 | } |
| 935 | |
| 936 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 937 | public @NotNull Long decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 938 | return byteSlice.getLong(); |
| 939 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 940 | |
| 941 | @Override |
| 942 | void encode(Long value, ByteWriter byteWriter) { |
| 943 | byteWriter.write(value); |
| 944 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 945 | } |
| 946 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 947 | private static class DoubleDecoder extends Decoder<Double> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 948 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 949 | @Override |
| 950 | public byte alignment() { |
| 951 | return 8; |
| 952 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 953 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 954 | @Override |
| 955 | public Integer fixedSize() { |
| 956 | return 8; |
| 957 | } |
| 958 | |
| 959 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 960 | public @NotNull Double decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 961 | return byteSlice.getDouble(); |
| 962 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 963 | |
| 964 | @Override |
| 965 | void encode(Double value, ByteWriter byteWriter) { |
| 966 | byteWriter.write(value); |
| 967 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 968 | } |
| 969 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 970 | private static class StringDecoder extends Decoder<String> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 971 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 972 | private final Charset charset; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 973 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 974 | public StringDecoder(Charset charset) { |
| 975 | this.charset = charset; |
| 976 | } |
| 977 | |
| 978 | @Override |
| 979 | public byte alignment() { |
| 980 | return 1; |
| 981 | } |
| 982 | |
| 983 | @Override |
| 984 | @Nullable |
| 985 | Integer fixedSize() { |
| 986 | return null; |
| 987 | } |
| 988 | |
| 989 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 990 | public @NotNull String decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 991 | byteSlice.limit(byteSlice.limit() - 1); |
| 992 | return charset.decode(byteSlice).toString(); |
| 993 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 994 | |
| 995 | @Override |
| 996 | void encode(String value, ByteWriter byteWriter) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 997 | byteWriter.write(charset.encode(value).rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 998 | byteWriter.write((byte) 0); |
| 999 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 1000 | } |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1001 | |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 1002 | @SuppressWarnings("Immutable") |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1003 | private class MappingDecoder<U> extends Decoder<U> { |
| 1004 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1005 | private final Function<@NotNull T, @NotNull U> decodingFunction; |
| 1006 | private final Function<@NotNull U, @NotNull T> encodingFunction; |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1007 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1008 | MappingDecoder(Function<@NotNull T, @NotNull U> decodingFunction, Function<@NotNull U, @NotNull T> encodingFunction) { |
| 1009 | this.decodingFunction = decodingFunction; |
| 1010 | this.encodingFunction = encodingFunction; |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | @Override |
| 1014 | public byte alignment() { |
| 1015 | return Decoder.this.alignment(); |
| 1016 | } |
| 1017 | |
| 1018 | @Override |
| 1019 | public @Nullable Integer fixedSize() { |
| 1020 | return Decoder.this.fixedSize(); |
| 1021 | } |
| 1022 | |
| 1023 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 1024 | public @NotNull U decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1025 | return decodingFunction.apply(Decoder.this.decode(byteSlice)); |
| 1026 | } |
| 1027 | |
| 1028 | @Override |
| 1029 | void encode(U value, ByteWriter byteWriter) { |
| 1030 | Decoder.this.encode(encodingFunction.apply(value), byteWriter); |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1031 | } |
| 1032 | } |
| 1033 | |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 1034 | @SuppressWarnings("Immutable") |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1035 | private class ContramappingDecoder extends Decoder<T> { |
| 1036 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1037 | private final UnaryOperator<ByteBuffer> decodingFunction; |
| 1038 | private final UnaryOperator<ByteBuffer> encodingFunction; |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1039 | |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1040 | ContramappingDecoder(UnaryOperator<ByteBuffer> decodingFunction, UnaryOperator<ByteBuffer> encodingFunction) { |
| 1041 | this.decodingFunction = decodingFunction; |
| 1042 | this.encodingFunction = encodingFunction; |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1043 | } |
| 1044 | |
| 1045 | @Override |
| 1046 | public byte alignment() { |
| 1047 | return Decoder.this.alignment(); |
| 1048 | } |
| 1049 | |
| 1050 | @Override |
| 1051 | public @Nullable Integer fixedSize() { |
| 1052 | return Decoder.this.fixedSize(); |
| 1053 | } |
| 1054 | |
| 1055 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 1056 | public @NotNull T decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1057 | var transformedBuffer = decodingFunction.apply(byteSlice.asReadOnlyBuffer().order(byteSlice.order())); |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1058 | return Decoder.this.decode(transformedBuffer); |
| 1059 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1060 | |
| 1061 | @Override |
| 1062 | void encode(T value, ByteWriter byteWriter) { |
| 1063 | var innerByteWriter = new ByteWriter(); |
| 1064 | Decoder.this.encode(value, innerByteWriter); |
| 1065 | var transformedBuffer = encodingFunction.apply(innerByteWriter.toByteBuffer()); |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1066 | byteWriter.write(transformedBuffer.rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1067 | } |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1068 | } |
| 1069 | |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1070 | private class ByteOrderFixingDecoder extends Decoder<T> { |
| 1071 | |
| 1072 | private final ByteOrder byteOrder; |
| 1073 | |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1074 | ByteOrderFixingDecoder(ByteOrder byteOrder) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1075 | this.byteOrder = byteOrder; |
| 1076 | } |
| 1077 | |
| 1078 | @Override |
| 1079 | public byte alignment() { |
| 1080 | return Decoder.this.alignment(); |
| 1081 | } |
| 1082 | |
| 1083 | @Override |
| 1084 | public @Nullable Integer fixedSize() { |
| 1085 | return Decoder.this.fixedSize(); |
| 1086 | } |
| 1087 | |
| 1088 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 1089 | public @NotNull T decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1090 | var newByteSlice = byteSlice.duplicate(); |
| 1091 | newByteSlice.order(byteOrder); |
| 1092 | return Decoder.this.decode(newByteSlice); |
| 1093 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1094 | |
| 1095 | @Override |
| 1096 | protected void encode(T value, ByteWriter byteWriter) { |
| 1097 | var newByteWriter = byteWriter.duplicate(); |
| 1098 | newByteWriter.order(byteOrder); |
| 1099 | Decoder.this.encode(value, newByteWriter); |
| 1100 | } |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 1101 | } |
| 1102 | |
| 1103 | private static ByteBuffer slicePreservingOrder(ByteBuffer byteSlice, int index, int length) { |
| 1104 | return byteSlice.slice(index, length).order(byteSlice.order()); |
| 1105 | } |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1106 | |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 1107 | @SuppressWarnings("Immutable") |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1108 | private static class PredicateDecoder<U> extends Decoder<U> { |
| 1109 | |
| 1110 | private final Predicate<ByteBuffer> selector; |
| 1111 | private final Decoder<U> thenDecoder; |
| 1112 | private final Decoder<U> elseDecoder; |
| 1113 | |
| 1114 | PredicateDecoder( |
| 1115 | Predicate<ByteBuffer> selector, Decoder<U> thenDecoder, Decoder<U> elseDecoder) { |
| 1116 | this.selector = selector; |
| 1117 | this.thenDecoder = thenDecoder; |
| 1118 | this.elseDecoder = elseDecoder; |
| 1119 | if (thenDecoder.alignment() != elseDecoder.alignment()) { |
| 1120 | throw new IllegalArgumentException( |
| 1121 | "incompatible alignments in predicate branches: then=%d, else=%d" |
| 1122 | .formatted(thenDecoder.alignment(), elseDecoder.alignment())); |
| 1123 | } |
| 1124 | |
| 1125 | if (!Objects.equals(thenDecoder.fixedSize(), elseDecoder.fixedSize())) { |
| 1126 | throw new IllegalArgumentException( |
| 1127 | "incompatible sizes in predicate branches: then=%s, else=%s" |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 1128 | .formatted( |
Matthias Andreas Benkard | 91dbd74 | 2022-10-17 19:38:56 +0200 | [diff] [blame] | 1129 | requireNonNullElse(thenDecoder.fixedSize(), "(null)"), |
| 1130 | requireNonNullElse(elseDecoder.fixedSize(), "(null)"))); |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | @Override |
| 1135 | public byte alignment() { |
| 1136 | return thenDecoder.alignment(); |
| 1137 | } |
| 1138 | |
| 1139 | @Override |
| 1140 | public @Nullable Integer fixedSize() { |
| 1141 | return thenDecoder.fixedSize(); |
| 1142 | } |
| 1143 | |
| 1144 | @Override |
Matthias Andreas Benkard | 9006e70 | 2022-03-01 13:43:50 +0100 | [diff] [blame] | 1145 | public @NotNull U decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1146 | var b = selector.test(byteSlice); |
| 1147 | byteSlice.rewind(); |
| 1148 | return b ? thenDecoder.decode(byteSlice) : elseDecoder.decode(byteSlice); |
| 1149 | } |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1150 | |
| 1151 | @Override |
| 1152 | public void encode(U value, ByteWriter byteWriter) { |
| 1153 | elseDecoder.encode(value, byteWriter); |
| 1154 | } |
| 1155 | } |
| 1156 | |
| 1157 | private static class ByteWriter { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1158 | private ByteOrder byteOrder = BIG_ENDIAN; |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1159 | private final ByteArrayOutputStream outputStream; |
| 1160 | |
| 1161 | ByteWriter() { |
| 1162 | this.outputStream = new ByteArrayOutputStream(); |
| 1163 | } |
| 1164 | |
| 1165 | private ByteWriter(ByteArrayOutputStream outputStream) { |
| 1166 | this.outputStream = outputStream; |
| 1167 | } |
| 1168 | |
| 1169 | void write(byte[] bytes) { |
| 1170 | outputStream.write(bytes, 0, bytes.length); |
| 1171 | } |
| 1172 | |
| 1173 | @SuppressWarnings("java:S2095") |
| 1174 | void write(ByteBuffer byteBuffer) { |
| 1175 | var channel = Channels.newChannel(outputStream); |
| 1176 | try { |
| 1177 | channel.write(byteBuffer); |
| 1178 | } catch (IOException e) { |
| 1179 | // impossible |
| 1180 | throw new IllegalStateException(e); |
| 1181 | } |
| 1182 | } |
| 1183 | |
| 1184 | void write(byte value) { |
| 1185 | outputStream.write(value); |
| 1186 | } |
| 1187 | |
| 1188 | void write(int value) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1189 | write(ByteBuffer.allocate(4).order(byteOrder).putInt(value).rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | void write(long value) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1193 | write(ByteBuffer.allocate(8).order(byteOrder).putLong(value).rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1194 | } |
| 1195 | |
| 1196 | void write(short value) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1197 | write(ByteBuffer.allocate(2).order(byteOrder).putShort(value).rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | void write(double value) { |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1201 | write(ByteBuffer.allocate(8).order(byteOrder).putDouble(value).rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | private void writeIntN(int value, int byteCount) { |
| 1205 | var byteBuffer = ByteBuffer.allocate(byteCount).order(LITTLE_ENDIAN); |
| 1206 | switch (byteCount) { |
| 1207 | case 0 -> {} |
| 1208 | case 1 -> |
| 1209 | byteBuffer.put((byte) value); |
| 1210 | case 2 -> |
| 1211 | byteBuffer.putShort((short) value); |
| 1212 | case 4 -> |
| 1213 | byteBuffer.putInt(value); |
| 1214 | default -> |
| 1215 | throw new IllegalArgumentException("invalid byte count: %d".formatted(byteCount)); |
| 1216 | } |
Matthias Andreas Benkard | e9440b5 | 2023-12-10 15:28:16 +0100 | [diff] [blame] | 1217 | write(byteBuffer.rewind()); |
Matthias Andreas Benkard | aa11d82 | 2023-12-10 09:20:48 +0100 | [diff] [blame] | 1218 | } |
| 1219 | |
| 1220 | ByteWriter duplicate() { |
| 1221 | var duplicate = new ByteWriter(outputStream); |
| 1222 | duplicate.byteOrder = byteOrder; |
| 1223 | return duplicate; |
| 1224 | } |
| 1225 | |
| 1226 | ByteBuffer toByteBuffer() { |
| 1227 | return ByteBuffer.wrap(outputStream.toByteArray()); |
| 1228 | } |
| 1229 | |
| 1230 | void order(ByteOrder byteOrder) { |
| 1231 | this.byteOrder = byteOrder; |
| 1232 | } |
| 1233 | |
| 1234 | int position() { |
| 1235 | return outputStream.size(); |
| 1236 | } |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 1237 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 1238 | } |