Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 1 | package eu.mulk.jgvariant.core; |
| 2 | |
| 3 | import static java.nio.ByteOrder.LITTLE_ENDIAN; |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 4 | import static java.util.stream.Collectors.toMap; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 5 | |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 6 | import java.lang.reflect.InvocationTargetException; |
| 7 | import java.lang.reflect.RecordComponent; |
| 8 | import java.nio.ByteBuffer; |
| 9 | import java.nio.ByteOrder; |
| 10 | import java.nio.charset.Charset; |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 11 | import java.text.ParseException; |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 12 | import java.util.AbstractMap.SimpleImmutableEntry; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 13 | import java.util.ArrayList; |
| 14 | import java.util.Arrays; |
| 15 | import java.util.List; |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 16 | import java.util.Map; |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 17 | import java.util.Map.Entry; |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 18 | import java.util.Objects; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 19 | import java.util.Optional; |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 20 | import java.util.function.Function; |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 21 | import java.util.function.Predicate; |
| 22 | import java.util.function.UnaryOperator; |
Matthias Andreas Benkard | 25b7f90 | 2021-12-17 06:02:11 +0100 | [diff] [blame] | 23 | import org.apiguardian.api.API; |
| 24 | import org.apiguardian.api.API.Status; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 25 | import org.jetbrains.annotations.Nullable; |
| 26 | |
| 27 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 28 | * Type class for decodable types. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 29 | * |
| 30 | * <p>Use the {@code of*} family of constructor methods to acquire a suitable {@link Decoder} for |
| 31 | * the type you wish to decode. |
| 32 | * |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 33 | * <p><strong>Example</strong> |
| 34 | * |
| 35 | * <p>To parse a GVariant of type {@code "a(si)"}, which is an array of pairs of {@link String} and |
| 36 | * {@code int}, you can use the following code: |
| 37 | * |
| 38 | * <pre>{@code |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 39 | * record ExampleRecord(String s, int i) {} |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 40 | * |
| 41 | * var decoder = |
| 42 | * Decoder.ofArray( |
| 43 | * Decoder.ofStructure( |
| 44 | * ExampleRecord.class, |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 45 | * Decoder.ofString(UTF_8), |
| 46 | * Decoder.ofInt().withByteOrder(LITTLE_ENDIAN))); |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 47 | * |
| 48 | * byte[] bytes = ...; |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 49 | * List<ExampleRecord> example = decoder.decode(ByteBuffer.wrap(bytes)); |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 50 | * }</pre> |
| 51 | * |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 52 | * @param <T> the type that the {@link Decoder} can decode. |
| 53 | */ |
| 54 | @SuppressWarnings("java:S1610") |
Matthias Andreas Benkard | 25b7f90 | 2021-12-17 06:02:11 +0100 | [diff] [blame] | 55 | @API(status = Status.EXPERIMENTAL) |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 56 | public abstract class Decoder<T> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 57 | |
| 58 | private Decoder() {} |
| 59 | |
| 60 | /** |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 61 | * Decodes a {@link ByteBuffer} holding a serialized GVariant into a value of type {@code T}. |
| 62 | * |
Matthias Andreas Benkard | 3f13b66 | 2021-12-18 18:57:37 +0100 | [diff] [blame] | 63 | * <p><strong>Note:</strong> Due to the way the GVariant serialization format works, it is |
| 64 | * important that the start and end boundaries of the passed byte slice correspond to the actual |
| 65 | * start and end of the serialized value. The format does generally not allow for the dynamic |
| 66 | * discovery of the end of the data structure. |
| 67 | * |
| 68 | * @param byteSlice a byte slice holding a serialized GVariant. |
| 69 | * @return the deserialized value. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 70 | * @throws java.nio.BufferUnderflowException if the byte buffer is shorter than the requested |
| 71 | * data. |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 72 | * @throws IllegalArgumentException if the serialized GVariant is ill-formed |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 73 | */ |
| 74 | public abstract T decode(ByteBuffer byteSlice); |
| 75 | |
| 76 | abstract byte alignment(); |
| 77 | |
| 78 | @Nullable |
| 79 | abstract Integer fixedSize(); |
| 80 | |
| 81 | final boolean hasFixedSize() { |
| 82 | return fixedSize() != null; |
| 83 | } |
| 84 | |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 85 | /** |
| 86 | * Switches the input {@link ByteBuffer} to a given {@link ByteOrder} before reading from it. |
| 87 | * |
| 88 | * @param byteOrder the byte order to use. |
| 89 | * @return a new, decorated {@link Decoder}. |
| 90 | */ |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 91 | public final Decoder<T> withByteOrder(ByteOrder byteOrder) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 92 | return new ByteOrderFixingDecoder(byteOrder); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 93 | } |
| 94 | |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 95 | /** |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 96 | * Creates a new {@link Decoder} from an existing one by applying a function to the result. |
| 97 | * |
| 98 | * @param function the function to apply. |
| 99 | * @return a new, decorated {@link Decoder}. |
| 100 | * @see java.util.stream.Stream#map |
| 101 | */ |
| 102 | public final <U> Decoder<U> map(Function<T, U> function) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 103 | return new MappingDecoder<>(function); |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | /** |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 107 | * Creates a new {@link Decoder} from an existing one by applying a function to the input. |
| 108 | * |
| 109 | * @param function the function to apply. |
| 110 | * @return a new, decorated {@link Decoder}. |
| 111 | * @see java.util.stream.Stream#map |
| 112 | */ |
| 113 | public final Decoder<T> contramap(UnaryOperator<ByteBuffer> function) { |
| 114 | return new ContramappingDecoder(function); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Creates a new {@link Decoder} that delegates to one of two other {@link Decoder}s based on a |
| 119 | * condition on the input {@link ByteBuffer}. |
| 120 | * |
| 121 | * @param selector the predicate to use to determine the decoder to use. |
| 122 | * @return a new {@link Decoder}. |
| 123 | */ |
| 124 | public static <U> Decoder<U> ofPredicate( |
| 125 | Predicate<ByteBuffer> selector, Decoder<U> thenDecoder, Decoder<U> elseDecoder) { |
| 126 | return new PredicateDecoder<>(selector, thenDecoder, elseDecoder); |
| 127 | } |
| 128 | |
| 129 | /** |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 130 | * Creates a {@link Decoder} for an {@code Array} type. |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 131 | * |
| 132 | * @param elementDecoder a {@link Decoder} for the elements of the array. |
| 133 | * @param <U> the element type. |
| 134 | * @return a new {@link Decoder}. |
| 135 | */ |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 136 | public static <U> Decoder<List<U>> ofArray(Decoder<U> elementDecoder) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 137 | return new ArrayDecoder<>(elementDecoder); |
| 138 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 139 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 140 | /** |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 141 | * Creates a {@link Decoder} for a {@code Dictionary} type. |
| 142 | * |
| 143 | * @param keyDecoder a {@link Decoder} for the key component of the dictionary entry. |
| 144 | * @param valueDecoder a {@link Decoder} for the value component of the dictionary entry. |
| 145 | * @return a new {@link Decoder}. |
| 146 | */ |
| 147 | public static <K, V> Decoder<Map<K, V>> ofDictionary( |
| 148 | Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 149 | return new DictionaryDecoder<>(keyDecoder, valueDecoder); |
| 150 | } |
| 151 | |
| 152 | /** |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 153 | * Creates a {@link Decoder} for an {@code Array} type of element type {@code byte} into a |
| 154 | * primitive {@code byte[]} array. |
| 155 | * |
| 156 | * @return a new {@link Decoder}. |
| 157 | */ |
| 158 | public static Decoder<byte[]> ofByteArray() { |
| 159 | return new ByteArrayDecoder(); |
| 160 | } |
| 161 | |
| 162 | /** |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 163 | * Creates a {@link Decoder} for a {@code Maybe} type. |
| 164 | * |
| 165 | * @param elementDecoder a {@link Decoder} for the contained element. |
| 166 | * @param <U> the element type. |
| 167 | * @return a new {@link Decoder}. |
| 168 | */ |
| 169 | public static <U> Decoder<Optional<U>> ofMaybe(Decoder<U> elementDecoder) { |
| 170 | return new MaybeDecoder<>(elementDecoder); |
| 171 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 172 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 173 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 174 | * 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] | 175 | * |
| 176 | * @param recordType the {@link Record} type that represents the components of the structure. |
| 177 | * @param componentDecoders a {@link Decoder} for each component of the structure. |
| 178 | * @param <U> the {@link Record} type that represents the components of the structure. |
| 179 | * @return a new {@link Decoder}. |
| 180 | */ |
| 181 | public static <U extends Record> Decoder<U> ofStructure( |
| 182 | Class<U> recordType, Decoder<?>... componentDecoders) { |
| 183 | return new StructureDecoder<>(recordType, componentDecoders); |
| 184 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 185 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 186 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 187 | * Creates a {@link Decoder} for a {@code Structure} type, decoding into a {@link List}. |
| 188 | * |
| 189 | * <p>Prefer {@link #ofStructure(Class, Decoder[])} if possible, which is both more type-safe and |
| 190 | * more convenient. |
| 191 | * |
| 192 | * @param componentDecoders a {@link Decoder} for each component of the structure. |
| 193 | * @return a new {@link Decoder}. |
| 194 | */ |
| 195 | public static Decoder<Object[]> ofStructure(Decoder<?>... componentDecoders) { |
| 196 | return new TupleDecoder(componentDecoders); |
| 197 | } |
| 198 | |
| 199 | /** |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 200 | * Creates a {@link Decoder} for a {@code Dictionary Entry} type, decoding into a {@link |
| 201 | * Map.Entry}. |
| 202 | * |
| 203 | * @param keyDecoder a {@link Decoder} for the key component of the dictionary entry. |
| 204 | * @param valueDecoder a {@link Decoder} for the value component of the dictionary entry. |
| 205 | * @return a new {@link Decoder}. |
| 206 | */ |
| 207 | public static <K, V> Decoder<Map.Entry<K, V>> ofDictionaryEntry( |
| 208 | Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 209 | return new DictionaryEntryDecoder<>(keyDecoder, valueDecoder); |
| 210 | } |
| 211 | |
| 212 | /** |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 213 | * Creates a {@link Decoder} for the {@link Variant} type. |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 214 | * |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 215 | * <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] | 216 | * |
| 217 | * <ul> |
| 218 | * <li>{@link Boolean} |
| 219 | * <li>{@link Byte} |
| 220 | * <li>{@link Short} |
| 221 | * <li>{@link Integer} |
| 222 | * <li>{@link Long} |
| 223 | * <li>{@link String} |
| 224 | * <li>{@link Optional} (a GVariant {@code Maybe} type) |
| 225 | * <li>{@link List} (a GVariant array) |
Matthias Andreas Benkard | a66b73d | 2021-12-18 19:15:52 +0100 | [diff] [blame] | 226 | * <li>{@code Object[]} (a GVariant structure) |
Matthias Andreas Benkard | d6a25d1 | 2021-12-28 01:13:58 +0100 | [diff] [blame] | 227 | * <li>{@link java.util.Map} (a dictionary) |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 228 | * <li>{@link java.util.Map.Entry} (a dictionary entry) |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 229 | * <li>{@link Variant} (a nested variant) |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 230 | * </ul> |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 231 | * |
| 232 | * @return a new {@link Decoder}. |
| 233 | */ |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 234 | public static Decoder<Variant> ofVariant() { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 235 | return new VariantDecoder(); |
| 236 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 237 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 238 | /** |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 239 | * Creates a {@link Decoder} for the {@code boolean} type. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 240 | * |
| 241 | * @return a new {@link Decoder}. |
| 242 | */ |
| 243 | public static Decoder<Boolean> ofBoolean() { |
| 244 | return new BooleanDecoder(); |
| 245 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 246 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 247 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 248 | * Creates a {@link Decoder} for the 8-bit {@code byte} type. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 249 | * |
| 250 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 251 | * result of this method. |
| 252 | * |
| 253 | * @return a new {@link Decoder}. |
| 254 | */ |
| 255 | public static Decoder<Byte> ofByte() { |
| 256 | return new ByteDecoder(); |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Creates a {@link Decoder} for the 16-bit {@code short} type. |
| 261 | * |
| 262 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 263 | * result of this method. |
| 264 | * |
| 265 | * @return a new {@link Decoder}. |
| 266 | */ |
| 267 | public static Decoder<Short> ofShort() { |
| 268 | return new ShortDecoder(); |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Creates a {@link Decoder} for the 32-bit {@code int} type. |
| 273 | * |
| 274 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 275 | * result of this method. |
| 276 | * |
| 277 | * @return a new {@link Decoder}. |
| 278 | */ |
| 279 | public static Decoder<Integer> ofInt() { |
| 280 | return new IntegerDecoder(); |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Creates a {@link Decoder} for the 64-bit {@code long} type. |
| 285 | * |
| 286 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 287 | * result of this method. |
| 288 | * |
| 289 | * @return a new {@link Decoder}. |
| 290 | */ |
| 291 | public static Decoder<Long> ofLong() { |
| 292 | return new LongDecoder(); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Creates a {@link Decoder} for the {@code double} type. |
| 297 | * |
| 298 | * @return a new {@link Decoder}. |
| 299 | */ |
| 300 | public static Decoder<Double> ofDouble() { |
| 301 | return new DoubleDecoder(); |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Creates a {@link Decoder} for the {@link String} type. |
| 306 | * |
| 307 | * <p><strong>Note:</strong> While GVariant does not prescribe any particular encoding, {@link |
| 308 | * java.nio.charset.StandardCharsets#UTF_8} is the most common choice. |
| 309 | * |
Matthias Andreas Benkard | 3f13b66 | 2021-12-18 18:57:37 +0100 | [diff] [blame] | 310 | * @param charset the {@link Charset} the string is encoded in. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 311 | * @return a new {@link Decoder}. |
| 312 | */ |
| 313 | public static Decoder<String> ofString(Charset charset) { |
| 314 | return new StringDecoder(charset); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 315 | } |
| 316 | |
| 317 | private static int align(int offset, byte alignment) { |
| 318 | return offset % alignment == 0 ? offset : offset + alignment - (offset % alignment); |
| 319 | } |
| 320 | |
| 321 | private static int getIntN(ByteBuffer byteSlice) { |
| 322 | var intBytes = new byte[4]; |
| 323 | byteSlice.get(intBytes, 0, Math.min(4, byteSlice.limit())); |
| 324 | return ByteBuffer.wrap(intBytes).order(LITTLE_ENDIAN).getInt(); |
| 325 | } |
| 326 | |
| 327 | @SuppressWarnings("java:S3358") |
| 328 | private static int byteCount(int n) { |
| 329 | return n < (1 << 8) ? 1 : n < (1 << 16) ? 2 : 4; |
| 330 | } |
| 331 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 332 | private static class ArrayDecoder<U> extends Decoder<List<U>> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 333 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 334 | private final Decoder<U> elementDecoder; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 335 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 336 | ArrayDecoder(Decoder<U> elementDecoder) { |
| 337 | this.elementDecoder = elementDecoder; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 338 | } |
| 339 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 340 | @Override |
| 341 | public byte alignment() { |
| 342 | return elementDecoder.alignment(); |
| 343 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 344 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 345 | @Override |
| 346 | @Nullable |
| 347 | Integer fixedSize() { |
| 348 | return null; |
| 349 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 350 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 351 | @Override |
| 352 | public List<U> decode(ByteBuffer byteSlice) { |
| 353 | List<U> elements; |
| 354 | |
| 355 | var elementSize = elementDecoder.fixedSize(); |
| 356 | if (elementSize != null) { |
| 357 | // A simple C-style array. |
| 358 | elements = new ArrayList<>(byteSlice.limit() / elementSize); |
| 359 | for (int i = 0; i < byteSlice.limit(); i += elementSize) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 360 | var element = elementDecoder.decode(slicePreservingOrder(byteSlice, i, elementSize)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 361 | elements.add(element); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 362 | } |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 363 | } else if (byteSlice.limit() == 0) { |
| 364 | // A degenerate zero-length array of variable width. |
| 365 | elements = List.of(); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 366 | } else { |
| 367 | // 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] | 368 | int framingOffsetSize = byteCount(byteSlice.limit()); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 369 | int lastFramingOffset = |
| 370 | getIntN(byteSlice.slice(byteSlice.limit() - framingOffsetSize, framingOffsetSize)); |
| 371 | int elementCount = (byteSlice.limit() - lastFramingOffset) / framingOffsetSize; |
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 | elements = new ArrayList<>(elementCount); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 374 | int position = 0; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 375 | for (int i = 0; i < elementCount; i++) { |
| 376 | int framingOffset = |
| 377 | getIntN( |
| 378 | byteSlice.slice(lastFramingOffset + i * framingOffsetSize, framingOffsetSize)); |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 379 | elements.add( |
| 380 | elementDecoder.decode( |
| 381 | slicePreservingOrder(byteSlice, position, framingOffset - position))); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 382 | position = align(framingOffset, alignment()); |
| 383 | } |
| 384 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 385 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 386 | return elements; |
| 387 | } |
| 388 | } |
| 389 | |
Matthias Andreas Benkard | 9a6c8ed | 2021-12-28 01:00:22 +0100 | [diff] [blame] | 390 | private static class DictionaryDecoder<K, V> extends Decoder<Map<K, V>> { |
| 391 | |
| 392 | private final ArrayDecoder<Map.Entry<K, V>> entryArrayDecoder; |
| 393 | |
| 394 | DictionaryDecoder(Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 395 | this.entryArrayDecoder = |
| 396 | new ArrayDecoder<>(new DictionaryEntryDecoder<>(keyDecoder, valueDecoder)); |
| 397 | } |
| 398 | |
| 399 | @Override |
| 400 | public byte alignment() { |
| 401 | return entryArrayDecoder.alignment(); |
| 402 | } |
| 403 | |
| 404 | @Override |
| 405 | public Integer fixedSize() { |
| 406 | return entryArrayDecoder.fixedSize(); |
| 407 | } |
| 408 | |
| 409 | @Override |
| 410 | public Map<K, V> decode(ByteBuffer byteSlice) { |
| 411 | List<Map.Entry<K, V>> entries = entryArrayDecoder.decode(byteSlice); |
| 412 | return entries.stream().collect(toMap(Entry::getKey, Entry::getValue)); |
| 413 | } |
| 414 | } |
| 415 | |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 416 | private static class ByteArrayDecoder extends Decoder<byte[]> { |
| 417 | |
| 418 | private static final int ELEMENT_SIZE = 1; |
| 419 | |
| 420 | @Override |
| 421 | public byte alignment() { |
| 422 | return ELEMENT_SIZE; |
| 423 | } |
| 424 | |
| 425 | @Override |
| 426 | @Nullable |
| 427 | Integer fixedSize() { |
| 428 | return null; |
| 429 | } |
| 430 | |
| 431 | @Override |
| 432 | public byte[] decode(ByteBuffer byteSlice) { |
| 433 | // A simple C-style array. |
| 434 | byte[] elements = new byte[byteSlice.limit() / ELEMENT_SIZE]; |
| 435 | byteSlice.get(elements); |
| 436 | return elements; |
| 437 | } |
| 438 | } |
| 439 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 440 | private static class MaybeDecoder<U> extends Decoder<Optional<U>> { |
| 441 | |
| 442 | private final Decoder<U> elementDecoder; |
| 443 | |
| 444 | MaybeDecoder(Decoder<U> elementDecoder) { |
| 445 | this.elementDecoder = elementDecoder; |
| 446 | } |
| 447 | |
| 448 | @Override |
| 449 | public byte alignment() { |
| 450 | return elementDecoder.alignment(); |
| 451 | } |
| 452 | |
| 453 | @Override |
| 454 | @Nullable |
| 455 | Integer fixedSize() { |
| 456 | return null; |
| 457 | } |
| 458 | |
| 459 | @Override |
| 460 | public Optional<U> decode(ByteBuffer byteSlice) { |
| 461 | if (!byteSlice.hasRemaining()) { |
| 462 | return Optional.empty(); |
| 463 | } else { |
| 464 | if (!elementDecoder.hasFixedSize()) { |
| 465 | // Remove trailing zero byte. |
| 466 | byteSlice.limit(byteSlice.limit() - 1); |
| 467 | } |
| 468 | |
| 469 | return Optional.of(elementDecoder.decode(byteSlice)); |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | private static class StructureDecoder<U extends Record> extends Decoder<U> { |
| 475 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 476 | private final Class<U> recordType; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 477 | private final TupleDecoder tupleDecoder; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 478 | |
| 479 | StructureDecoder(Class<U> recordType, Decoder<?>... componentDecoders) { |
| 480 | var recordComponents = recordType.getRecordComponents(); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 481 | if (componentDecoders.length != recordComponents.length) { |
| 482 | throw new IllegalArgumentException( |
| 483 | "number of decoders (%d) does not match number of structure components (%d)" |
| 484 | .formatted(componentDecoders.length, recordComponents.length)); |
| 485 | } |
| 486 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 487 | this.recordType = recordType; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 488 | this.tupleDecoder = new TupleDecoder(componentDecoders); |
| 489 | } |
| 490 | |
| 491 | @Override |
| 492 | public byte alignment() { |
| 493 | return tupleDecoder.alignment(); |
| 494 | } |
| 495 | |
| 496 | @Override |
| 497 | public Integer fixedSize() { |
| 498 | return tupleDecoder.fixedSize(); |
| 499 | } |
| 500 | |
| 501 | @Override |
| 502 | public U decode(ByteBuffer byteSlice) { |
| 503 | Object[] recordConstructorArguments = tupleDecoder.decode(byteSlice); |
| 504 | |
| 505 | try { |
| 506 | var recordComponentTypes = |
| 507 | Arrays.stream(recordType.getRecordComponents()) |
| 508 | .map(RecordComponent::getType) |
| 509 | .toArray(Class<?>[]::new); |
| 510 | var recordConstructor = recordType.getDeclaredConstructor(recordComponentTypes); |
| 511 | return recordConstructor.newInstance(recordConstructorArguments); |
| 512 | } catch (NoSuchMethodException |
| 513 | | InstantiationException |
| 514 | | IllegalAccessException |
| 515 | | InvocationTargetException e) { |
| 516 | throw new IllegalStateException(e); |
| 517 | } |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | private static class TupleDecoder extends Decoder<Object[]> { |
| 522 | |
| 523 | private final Decoder<?>[] componentDecoders; |
| 524 | |
| 525 | TupleDecoder(Decoder<?>... componentDecoders) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 526 | this.componentDecoders = componentDecoders; |
| 527 | } |
| 528 | |
| 529 | @Override |
| 530 | public byte alignment() { |
| 531 | return (byte) Arrays.stream(componentDecoders).mapToInt(Decoder::alignment).max().orElse(1); |
| 532 | } |
| 533 | |
| 534 | @Override |
| 535 | public Integer fixedSize() { |
| 536 | int position = 0; |
| 537 | for (var componentDecoder : componentDecoders) { |
| 538 | var fixedComponentSize = componentDecoder.fixedSize(); |
| 539 | if (fixedComponentSize == null) { |
| 540 | return null; |
| 541 | } |
| 542 | |
| 543 | position = align(position, componentDecoder.alignment()); |
| 544 | position += fixedComponentSize; |
| 545 | } |
| 546 | |
| 547 | if (position == 0) { |
| 548 | return 1; |
| 549 | } |
| 550 | |
| 551 | return align(position, alignment()); |
| 552 | } |
| 553 | |
| 554 | @Override |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 555 | public Object[] decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 556 | int framingOffsetSize = byteCount(byteSlice.limit()); |
| 557 | |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 558 | var objects = new Object[componentDecoders.length]; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 559 | |
| 560 | int position = 0; |
| 561 | int framingOffsetIndex = 0; |
| 562 | int componentIndex = 0; |
| 563 | for (var componentDecoder : componentDecoders) { |
| 564 | position = align(position, componentDecoder.alignment()); |
| 565 | |
| 566 | var fixedComponentSize = componentDecoder.fixedSize(); |
| 567 | if (fixedComponentSize != null) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 568 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 569 | componentDecoder.decode( |
| 570 | slicePreservingOrder(byteSlice, position, fixedComponentSize)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 571 | position += fixedComponentSize; |
| 572 | } else { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 573 | if (componentIndex == componentDecoders.length - 1) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 574 | // The last component never has a framing offset. |
| 575 | int endPosition = byteSlice.limit() - framingOffsetIndex * framingOffsetSize; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 576 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 577 | componentDecoder.decode( |
| 578 | slicePreservingOrder(byteSlice, position, endPosition - position)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 579 | position = endPosition; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 580 | } else { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 581 | int framingOffset = |
| 582 | getIntN( |
| 583 | byteSlice.slice( |
| 584 | byteSlice.limit() - (1 + framingOffsetIndex) * framingOffsetSize, |
| 585 | framingOffsetSize)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 586 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 587 | componentDecoder.decode( |
| 588 | slicePreservingOrder(byteSlice, position, framingOffset - position)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 589 | position = framingOffset; |
| 590 | ++framingOffsetIndex; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 591 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 592 | } |
| 593 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 594 | ++componentIndex; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 595 | } |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 596 | |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 597 | return objects; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 598 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 599 | } |
| 600 | |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame] | 601 | private static class DictionaryEntryDecoder<K, V> extends Decoder<Map.Entry<K, V>> { |
| 602 | |
| 603 | private final TupleDecoder tupleDecoder; |
| 604 | |
| 605 | DictionaryEntryDecoder(Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 606 | this.tupleDecoder = new TupleDecoder(keyDecoder, valueDecoder); |
| 607 | } |
| 608 | |
| 609 | @Override |
| 610 | public byte alignment() { |
| 611 | return tupleDecoder.alignment(); |
| 612 | } |
| 613 | |
| 614 | @Override |
| 615 | public Integer fixedSize() { |
| 616 | return tupleDecoder.fixedSize(); |
| 617 | } |
| 618 | |
| 619 | @Override |
| 620 | @SuppressWarnings("unchecked") |
| 621 | public Map.Entry<K, V> decode(ByteBuffer byteSlice) { |
| 622 | Object[] components = tupleDecoder.decode(byteSlice); |
| 623 | return new SimpleImmutableEntry<>((K) components[0], (V) components[1]); |
| 624 | } |
| 625 | } |
| 626 | |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 627 | private static class VariantDecoder extends Decoder<Variant> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 628 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 629 | @Override |
| 630 | public byte alignment() { |
| 631 | return 8; |
| 632 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 633 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 634 | @Override |
| 635 | @Nullable |
| 636 | Integer fixedSize() { |
| 637 | return null; |
| 638 | } |
| 639 | |
| 640 | @Override |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 641 | public Variant decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 642 | for (int i = byteSlice.limit() - 1; i >= 0; --i) { |
| 643 | if (byteSlice.get(i) != 0) { |
| 644 | continue; |
| 645 | } |
| 646 | |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 647 | var dataBytes = slicePreservingOrder(byteSlice, 0, i); |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 648 | var signatureBytes = byteSlice.slice(i + 1, byteSlice.limit() - (i + 1)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 649 | |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 650 | Signature signature; |
| 651 | try { |
| 652 | signature = Signature.parse(signatureBytes); |
| 653 | } catch (ParseException e) { |
| 654 | throw new IllegalArgumentException(e); |
| 655 | } |
| 656 | |
| 657 | return new Variant(signature, signature.decoder().decode(dataBytes)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 658 | } |
| 659 | |
| 660 | throw new IllegalArgumentException("variant signature not found"); |
| 661 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 662 | } |
| 663 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 664 | private static class BooleanDecoder extends Decoder<Boolean> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 665 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 666 | @Override |
| 667 | public byte alignment() { |
| 668 | return 1; |
| 669 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 670 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 671 | @Override |
| 672 | public Integer fixedSize() { |
| 673 | return 1; |
| 674 | } |
| 675 | |
| 676 | @Override |
| 677 | public Boolean decode(ByteBuffer byteSlice) { |
| 678 | return byteSlice.get() != 0; |
| 679 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 680 | } |
| 681 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 682 | private static class ByteDecoder extends Decoder<Byte> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 683 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 684 | @Override |
| 685 | public byte alignment() { |
| 686 | return 1; |
| 687 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 688 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 689 | @Override |
| 690 | public Integer fixedSize() { |
| 691 | return 1; |
| 692 | } |
| 693 | |
| 694 | @Override |
| 695 | public Byte decode(ByteBuffer byteSlice) { |
| 696 | return byteSlice.get(); |
| 697 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 698 | } |
| 699 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 700 | private static class ShortDecoder extends Decoder<Short> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 701 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 702 | @Override |
| 703 | public byte alignment() { |
| 704 | return 2; |
| 705 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 706 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 707 | @Override |
| 708 | public Integer fixedSize() { |
| 709 | return 2; |
| 710 | } |
| 711 | |
| 712 | @Override |
| 713 | public Short decode(ByteBuffer byteSlice) { |
| 714 | return byteSlice.getShort(); |
| 715 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 716 | } |
| 717 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 718 | private static class IntegerDecoder extends Decoder<Integer> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 719 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 720 | @Override |
| 721 | public byte alignment() { |
| 722 | return 4; |
| 723 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 724 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 725 | @Override |
| 726 | public Integer fixedSize() { |
| 727 | return 4; |
| 728 | } |
| 729 | |
| 730 | @Override |
| 731 | public Integer decode(ByteBuffer byteSlice) { |
| 732 | return byteSlice.getInt(); |
| 733 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 734 | } |
| 735 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 736 | private static class LongDecoder extends Decoder<Long> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 737 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 738 | @Override |
| 739 | public byte alignment() { |
| 740 | return 8; |
| 741 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 742 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 743 | @Override |
| 744 | public Integer fixedSize() { |
| 745 | return 8; |
| 746 | } |
| 747 | |
| 748 | @Override |
| 749 | public Long decode(ByteBuffer byteSlice) { |
| 750 | return byteSlice.getLong(); |
| 751 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 752 | } |
| 753 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 754 | private static class DoubleDecoder extends Decoder<Double> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 755 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 756 | @Override |
| 757 | public byte alignment() { |
| 758 | return 8; |
| 759 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 760 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 761 | @Override |
| 762 | public Integer fixedSize() { |
| 763 | return 8; |
| 764 | } |
| 765 | |
| 766 | @Override |
| 767 | public Double decode(ByteBuffer byteSlice) { |
| 768 | return byteSlice.getDouble(); |
| 769 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 770 | } |
| 771 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 772 | private static class StringDecoder extends Decoder<String> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 773 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 774 | private final Charset charset; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 775 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 776 | public StringDecoder(Charset charset) { |
| 777 | this.charset = charset; |
| 778 | } |
| 779 | |
| 780 | @Override |
| 781 | public byte alignment() { |
| 782 | return 1; |
| 783 | } |
| 784 | |
| 785 | @Override |
| 786 | @Nullable |
| 787 | Integer fixedSize() { |
| 788 | return null; |
| 789 | } |
| 790 | |
| 791 | @Override |
| 792 | public String decode(ByteBuffer byteSlice) { |
| 793 | byteSlice.limit(byteSlice.limit() - 1); |
| 794 | return charset.decode(byteSlice).toString(); |
| 795 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 796 | } |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 797 | |
| 798 | private class MappingDecoder<U> extends Decoder<U> { |
| 799 | |
| 800 | private final Function<T, U> function; |
| 801 | |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 802 | MappingDecoder(Function<T, U> function) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 803 | this.function = function; |
| 804 | } |
| 805 | |
| 806 | @Override |
| 807 | public byte alignment() { |
| 808 | return Decoder.this.alignment(); |
| 809 | } |
| 810 | |
| 811 | @Override |
| 812 | public @Nullable Integer fixedSize() { |
| 813 | return Decoder.this.fixedSize(); |
| 814 | } |
| 815 | |
| 816 | @Override |
| 817 | public U decode(ByteBuffer byteSlice) { |
| 818 | return function.apply(Decoder.this.decode(byteSlice)); |
| 819 | } |
| 820 | } |
| 821 | |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 822 | private class ContramappingDecoder extends Decoder<T> { |
| 823 | |
| 824 | private final UnaryOperator<ByteBuffer> function; |
| 825 | |
| 826 | ContramappingDecoder(UnaryOperator<ByteBuffer> function) { |
| 827 | this.function = function; |
| 828 | } |
| 829 | |
| 830 | @Override |
| 831 | public byte alignment() { |
| 832 | return Decoder.this.alignment(); |
| 833 | } |
| 834 | |
| 835 | @Override |
| 836 | public @Nullable Integer fixedSize() { |
| 837 | return Decoder.this.fixedSize(); |
| 838 | } |
| 839 | |
| 840 | @Override |
| 841 | public T decode(ByteBuffer byteSlice) { |
| 842 | var transformedBuffer = function.apply(byteSlice.asReadOnlyBuffer().order(byteSlice.order())); |
| 843 | return Decoder.this.decode(transformedBuffer); |
| 844 | } |
| 845 | } |
| 846 | |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 847 | private class ByteOrderFixingDecoder extends Decoder<T> { |
| 848 | |
| 849 | private final ByteOrder byteOrder; |
| 850 | |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 851 | ByteOrderFixingDecoder(ByteOrder byteOrder) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 852 | this.byteOrder = byteOrder; |
| 853 | } |
| 854 | |
| 855 | @Override |
| 856 | public byte alignment() { |
| 857 | return Decoder.this.alignment(); |
| 858 | } |
| 859 | |
| 860 | @Override |
| 861 | public @Nullable Integer fixedSize() { |
| 862 | return Decoder.this.fixedSize(); |
| 863 | } |
| 864 | |
| 865 | @Override |
| 866 | public T decode(ByteBuffer byteSlice) { |
| 867 | var newByteSlice = byteSlice.duplicate(); |
| 868 | newByteSlice.order(byteOrder); |
| 869 | return Decoder.this.decode(newByteSlice); |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | private static ByteBuffer slicePreservingOrder(ByteBuffer byteSlice, int index, int length) { |
| 874 | return byteSlice.slice(index, length).order(byteSlice.order()); |
| 875 | } |
Matthias Andreas Benkard | 44df94e | 2021-12-30 18:43:33 +0100 | [diff] [blame] | 876 | |
| 877 | private static class PredicateDecoder<U> extends Decoder<U> { |
| 878 | |
| 879 | private final Predicate<ByteBuffer> selector; |
| 880 | private final Decoder<U> thenDecoder; |
| 881 | private final Decoder<U> elseDecoder; |
| 882 | |
| 883 | PredicateDecoder( |
| 884 | Predicate<ByteBuffer> selector, Decoder<U> thenDecoder, Decoder<U> elseDecoder) { |
| 885 | this.selector = selector; |
| 886 | this.thenDecoder = thenDecoder; |
| 887 | this.elseDecoder = elseDecoder; |
| 888 | if (thenDecoder.alignment() != elseDecoder.alignment()) { |
| 889 | throw new IllegalArgumentException( |
| 890 | "incompatible alignments in predicate branches: then=%d, else=%d" |
| 891 | .formatted(thenDecoder.alignment(), elseDecoder.alignment())); |
| 892 | } |
| 893 | |
| 894 | if (!Objects.equals(thenDecoder.fixedSize(), elseDecoder.fixedSize())) { |
| 895 | throw new IllegalArgumentException( |
| 896 | "incompatible sizes in predicate branches: then=%s, else=%s" |
| 897 | .formatted(thenDecoder.fixedSize(), elseDecoder.fixedSize())); |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | @Override |
| 902 | public byte alignment() { |
| 903 | return thenDecoder.alignment(); |
| 904 | } |
| 905 | |
| 906 | @Override |
| 907 | public @Nullable Integer fixedSize() { |
| 908 | return thenDecoder.fixedSize(); |
| 909 | } |
| 910 | |
| 911 | @Override |
| 912 | public U decode(ByteBuffer byteSlice) { |
| 913 | var b = selector.test(byteSlice); |
| 914 | byteSlice.rewind(); |
| 915 | return b ? thenDecoder.decode(byteSlice) : elseDecoder.decode(byteSlice); |
| 916 | } |
| 917 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 918 | } |