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; |
| 4 | |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 5 | import java.lang.reflect.InvocationTargetException; |
| 6 | import java.lang.reflect.RecordComponent; |
| 7 | import java.nio.ByteBuffer; |
| 8 | import java.nio.ByteOrder; |
| 9 | import java.nio.charset.Charset; |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 10 | import java.text.ParseException; |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame^] | 11 | import java.util.AbstractMap.SimpleImmutableEntry; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 12 | import java.util.ArrayList; |
| 13 | import java.util.Arrays; |
| 14 | import java.util.List; |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame^] | 15 | import java.util.Map; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 16 | import java.util.Optional; |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 17 | import java.util.function.Function; |
Matthias Andreas Benkard | 25b7f90 | 2021-12-17 06:02:11 +0100 | [diff] [blame] | 18 | import org.apiguardian.api.API; |
| 19 | import org.apiguardian.api.API.Status; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 20 | import org.jetbrains.annotations.Nullable; |
| 21 | |
| 22 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 23 | * Type class for decodable types. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 24 | * |
| 25 | * <p>Use the {@code of*} family of constructor methods to acquire a suitable {@link Decoder} for |
| 26 | * the type you wish to decode. |
| 27 | * |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 28 | * <p><strong>Example</strong> |
| 29 | * |
| 30 | * <p>To parse a GVariant of type {@code "a(si)"}, which is an array of pairs of {@link String} and |
| 31 | * {@code int}, you can use the following code: |
| 32 | * |
| 33 | * <pre>{@code |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 34 | * record ExampleRecord(String s, int i) {} |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 35 | * |
| 36 | * var decoder = |
| 37 | * Decoder.ofArray( |
| 38 | * Decoder.ofStructure( |
| 39 | * ExampleRecord.class, |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 40 | * Decoder.ofString(UTF_8), |
| 41 | * Decoder.ofInt().withByteOrder(LITTLE_ENDIAN))); |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 42 | * |
| 43 | * byte[] bytes = ...; |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 44 | * List<ExampleRecord> example = decoder.decode(ByteBuffer.wrap(bytes)); |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 45 | * }</pre> |
| 46 | * |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 47 | * @param <T> the type that the {@link Decoder} can decode. |
| 48 | */ |
| 49 | @SuppressWarnings("java:S1610") |
Matthias Andreas Benkard | 25b7f90 | 2021-12-17 06:02:11 +0100 | [diff] [blame] | 50 | @API(status = Status.EXPERIMENTAL) |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 51 | public abstract class Decoder<T> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 52 | |
| 53 | private Decoder() {} |
| 54 | |
| 55 | /** |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 56 | * Decodes a {@link ByteBuffer} holding a serialized GVariant into a value of type {@code T}. |
| 57 | * |
Matthias Andreas Benkard | 3f13b66 | 2021-12-18 18:57:37 +0100 | [diff] [blame] | 58 | * <p><strong>Note:</strong> Due to the way the GVariant serialization format works, it is |
| 59 | * important that the start and end boundaries of the passed byte slice correspond to the actual |
| 60 | * start and end of the serialized value. The format does generally not allow for the dynamic |
| 61 | * discovery of the end of the data structure. |
| 62 | * |
| 63 | * @param byteSlice a byte slice holding a serialized GVariant. |
| 64 | * @return the deserialized value. |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 65 | * @throws java.nio.BufferUnderflowException if the byte buffer is shorter than the requested |
| 66 | * data. |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 67 | * @throws IllegalArgumentException if the serialized GVariant is ill-formed |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 68 | */ |
| 69 | public abstract T decode(ByteBuffer byteSlice); |
| 70 | |
| 71 | abstract byte alignment(); |
| 72 | |
| 73 | @Nullable |
| 74 | abstract Integer fixedSize(); |
| 75 | |
| 76 | final boolean hasFixedSize() { |
| 77 | return fixedSize() != null; |
| 78 | } |
| 79 | |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 80 | /** |
| 81 | * Switches the input {@link ByteBuffer} to a given {@link ByteOrder} before reading from it. |
| 82 | * |
| 83 | * @param byteOrder the byte order to use. |
| 84 | * @return a new, decorated {@link Decoder}. |
| 85 | */ |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 86 | public final Decoder<T> withByteOrder(ByteOrder byteOrder) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 87 | return new ByteOrderFixingDecoder(byteOrder); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 88 | } |
| 89 | |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 90 | /** |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 91 | * Creates a new {@link Decoder} from an existing one by applying a function to the result. |
| 92 | * |
| 93 | * @param function the function to apply. |
| 94 | * @return a new, decorated {@link Decoder}. |
| 95 | * @see java.util.stream.Stream#map |
| 96 | */ |
| 97 | public final <U> Decoder<U> map(Function<T, U> function) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 98 | return new MappingDecoder<>(function); |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | /** |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 102 | * Creates a {@link Decoder} for an {@code Array} type. |
Matthias Andreas Benkard | 4c32c39 | 2021-12-12 21:23:53 +0100 | [diff] [blame] | 103 | * |
| 104 | * @param elementDecoder a {@link Decoder} for the elements of the array. |
| 105 | * @param <U> the element type. |
| 106 | * @return a new {@link Decoder}. |
| 107 | */ |
Matthias Andreas Benkard | 35f7a20 | 2021-12-14 19:29:26 +0100 | [diff] [blame] | 108 | public static <U> Decoder<List<U>> ofArray(Decoder<U> elementDecoder) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 109 | return new ArrayDecoder<>(elementDecoder); |
| 110 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 111 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 112 | /** |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 113 | * Creates a {@link Decoder} for an {@code Array} type of element type {@code byte} into a |
| 114 | * primitive {@code byte[]} array. |
| 115 | * |
| 116 | * @return a new {@link Decoder}. |
| 117 | */ |
| 118 | public static Decoder<byte[]> ofByteArray() { |
| 119 | return new ByteArrayDecoder(); |
| 120 | } |
| 121 | |
| 122 | /** |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 123 | * Creates a {@link Decoder} for a {@code Maybe} type. |
| 124 | * |
| 125 | * @param elementDecoder a {@link Decoder} for the contained element. |
| 126 | * @param <U> the element type. |
| 127 | * @return a new {@link Decoder}. |
| 128 | */ |
| 129 | public static <U> Decoder<Optional<U>> ofMaybe(Decoder<U> elementDecoder) { |
| 130 | return new MaybeDecoder<>(elementDecoder); |
| 131 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 132 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 133 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 134 | * 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] | 135 | * |
| 136 | * @param recordType the {@link Record} type that represents the components of the structure. |
| 137 | * @param componentDecoders a {@link Decoder} for each component of the structure. |
| 138 | * @param <U> the {@link Record} type that represents the components of the structure. |
| 139 | * @return a new {@link Decoder}. |
| 140 | */ |
| 141 | public static <U extends Record> Decoder<U> ofStructure( |
| 142 | Class<U> recordType, Decoder<?>... componentDecoders) { |
| 143 | return new StructureDecoder<>(recordType, componentDecoders); |
| 144 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 145 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 146 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 147 | * Creates a {@link Decoder} for a {@code Structure} type, decoding into a {@link List}. |
| 148 | * |
| 149 | * <p>Prefer {@link #ofStructure(Class, Decoder[])} if possible, which is both more type-safe and |
| 150 | * more convenient. |
| 151 | * |
| 152 | * @param componentDecoders a {@link Decoder} for each component of the structure. |
| 153 | * @return a new {@link Decoder}. |
| 154 | */ |
| 155 | public static Decoder<Object[]> ofStructure(Decoder<?>... componentDecoders) { |
| 156 | return new TupleDecoder(componentDecoders); |
| 157 | } |
| 158 | |
| 159 | /** |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame^] | 160 | * Creates a {@link Decoder} for a {@code Dictionary Entry} type, decoding into a {@link |
| 161 | * Map.Entry}. |
| 162 | * |
| 163 | * @param keyDecoder a {@link Decoder} for the key component of the dictionary entry. |
| 164 | * @param valueDecoder a {@link Decoder} for the value component of the dictionary entry. |
| 165 | * @return a new {@link Decoder}. |
| 166 | */ |
| 167 | public static <K, V> Decoder<Map.Entry<K, V>> ofDictionaryEntry( |
| 168 | Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 169 | return new DictionaryEntryDecoder<>(keyDecoder, valueDecoder); |
| 170 | } |
| 171 | |
| 172 | /** |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 173 | * Creates a {@link Decoder} for the {@link Variant} type. |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 174 | * |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 175 | * <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] | 176 | * |
| 177 | * <ul> |
| 178 | * <li>{@link Boolean} |
| 179 | * <li>{@link Byte} |
| 180 | * <li>{@link Short} |
| 181 | * <li>{@link Integer} |
| 182 | * <li>{@link Long} |
| 183 | * <li>{@link String} |
| 184 | * <li>{@link Optional} (a GVariant {@code Maybe} type) |
| 185 | * <li>{@link List} (a GVariant array) |
Matthias Andreas Benkard | a66b73d | 2021-12-18 19:15:52 +0100 | [diff] [blame] | 186 | * <li>{@code Object[]} (a GVariant structure) |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame^] | 187 | * <li>{@link java.util.Map.Entry} (a dictionary entry) |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 188 | * <li>{@link Variant} (a nested variant) |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 189 | * </ul> |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 190 | * |
| 191 | * @return a new {@link Decoder}. |
| 192 | */ |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 193 | public static Decoder<Variant> ofVariant() { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 194 | return new VariantDecoder(); |
| 195 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 196 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 197 | /** |
Matthias Andreas Benkard | b50fcd0 | 2021-12-16 20:17:20 +0100 | [diff] [blame] | 198 | * Creates a {@link Decoder} for the {@code boolean} type. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 199 | * |
| 200 | * @return a new {@link Decoder}. |
| 201 | */ |
| 202 | public static Decoder<Boolean> ofBoolean() { |
| 203 | return new BooleanDecoder(); |
| 204 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 205 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 206 | /** |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 207 | * Creates a {@link Decoder} for the 8-bit {@code byte} type. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 208 | * |
| 209 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 210 | * result of this method. |
| 211 | * |
| 212 | * @return a new {@link Decoder}. |
| 213 | */ |
| 214 | public static Decoder<Byte> ofByte() { |
| 215 | return new ByteDecoder(); |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Creates a {@link Decoder} for the 16-bit {@code short} type. |
| 220 | * |
| 221 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 222 | * result of this method. |
| 223 | * |
| 224 | * @return a new {@link Decoder}. |
| 225 | */ |
| 226 | public static Decoder<Short> ofShort() { |
| 227 | return new ShortDecoder(); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Creates a {@link Decoder} for the 32-bit {@code int} type. |
| 232 | * |
| 233 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 234 | * result of this method. |
| 235 | * |
| 236 | * @return a new {@link Decoder}. |
| 237 | */ |
| 238 | public static Decoder<Integer> ofInt() { |
| 239 | return new IntegerDecoder(); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Creates a {@link Decoder} for the 64-bit {@code long} type. |
| 244 | * |
| 245 | * <p><strong>Note:</strong> It is often useful to apply {@link #withByteOrder(ByteOrder)} to the |
| 246 | * result of this method. |
| 247 | * |
| 248 | * @return a new {@link Decoder}. |
| 249 | */ |
| 250 | public static Decoder<Long> ofLong() { |
| 251 | return new LongDecoder(); |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Creates a {@link Decoder} for the {@code double} type. |
| 256 | * |
| 257 | * @return a new {@link Decoder}. |
| 258 | */ |
| 259 | public static Decoder<Double> ofDouble() { |
| 260 | return new DoubleDecoder(); |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Creates a {@link Decoder} for the {@link String} type. |
| 265 | * |
| 266 | * <p><strong>Note:</strong> While GVariant does not prescribe any particular encoding, {@link |
| 267 | * java.nio.charset.StandardCharsets#UTF_8} is the most common choice. |
| 268 | * |
Matthias Andreas Benkard | 3f13b66 | 2021-12-18 18:57:37 +0100 | [diff] [blame] | 269 | * @param charset the {@link Charset} the string is encoded in. |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 270 | * @return a new {@link Decoder}. |
| 271 | */ |
| 272 | public static Decoder<String> ofString(Charset charset) { |
| 273 | return new StringDecoder(charset); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | private static int align(int offset, byte alignment) { |
| 277 | return offset % alignment == 0 ? offset : offset + alignment - (offset % alignment); |
| 278 | } |
| 279 | |
| 280 | private static int getIntN(ByteBuffer byteSlice) { |
| 281 | var intBytes = new byte[4]; |
| 282 | byteSlice.get(intBytes, 0, Math.min(4, byteSlice.limit())); |
| 283 | return ByteBuffer.wrap(intBytes).order(LITTLE_ENDIAN).getInt(); |
| 284 | } |
| 285 | |
| 286 | @SuppressWarnings("java:S3358") |
| 287 | private static int byteCount(int n) { |
| 288 | return n < (1 << 8) ? 1 : n < (1 << 16) ? 2 : 4; |
| 289 | } |
| 290 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 291 | private static class ArrayDecoder<U> extends Decoder<List<U>> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 292 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 293 | private final Decoder<U> elementDecoder; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 294 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 295 | ArrayDecoder(Decoder<U> elementDecoder) { |
| 296 | this.elementDecoder = elementDecoder; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 297 | } |
| 298 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 299 | @Override |
| 300 | public byte alignment() { |
| 301 | return elementDecoder.alignment(); |
| 302 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 303 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 304 | @Override |
| 305 | @Nullable |
| 306 | Integer fixedSize() { |
| 307 | return null; |
| 308 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 309 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 310 | @Override |
| 311 | public List<U> decode(ByteBuffer byteSlice) { |
| 312 | List<U> elements; |
| 313 | |
| 314 | var elementSize = elementDecoder.fixedSize(); |
| 315 | if (elementSize != null) { |
| 316 | // A simple C-style array. |
| 317 | elements = new ArrayList<>(byteSlice.limit() / elementSize); |
| 318 | for (int i = 0; i < byteSlice.limit(); i += elementSize) { |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 319 | var element = elementDecoder.decode(slicePreservingOrder(byteSlice, i, elementSize)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 320 | elements.add(element); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 321 | } |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 322 | } else if (byteSlice.limit() == 0) { |
| 323 | // A degenerate zero-length array of variable width. |
| 324 | elements = List.of(); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 325 | } else { |
| 326 | // 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] | 327 | int framingOffsetSize = byteCount(byteSlice.limit()); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 328 | int lastFramingOffset = |
| 329 | getIntN(byteSlice.slice(byteSlice.limit() - framingOffsetSize, framingOffsetSize)); |
| 330 | int elementCount = (byteSlice.limit() - lastFramingOffset) / framingOffsetSize; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 331 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 332 | elements = new ArrayList<>(elementCount); |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 333 | int position = 0; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 334 | for (int i = 0; i < elementCount; i++) { |
| 335 | int framingOffset = |
| 336 | getIntN( |
| 337 | byteSlice.slice(lastFramingOffset + i * framingOffsetSize, framingOffsetSize)); |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 338 | elements.add( |
| 339 | elementDecoder.decode( |
| 340 | slicePreservingOrder(byteSlice, position, framingOffset - position))); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 341 | position = align(framingOffset, alignment()); |
| 342 | } |
| 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 | return elements; |
| 346 | } |
| 347 | } |
| 348 | |
Matthias Andreas Benkard | 4e8423d | 2021-12-19 22:56:09 +0100 | [diff] [blame] | 349 | private static class ByteArrayDecoder extends Decoder<byte[]> { |
| 350 | |
| 351 | private static final int ELEMENT_SIZE = 1; |
| 352 | |
| 353 | @Override |
| 354 | public byte alignment() { |
| 355 | return ELEMENT_SIZE; |
| 356 | } |
| 357 | |
| 358 | @Override |
| 359 | @Nullable |
| 360 | Integer fixedSize() { |
| 361 | return null; |
| 362 | } |
| 363 | |
| 364 | @Override |
| 365 | public byte[] decode(ByteBuffer byteSlice) { |
| 366 | // A simple C-style array. |
| 367 | byte[] elements = new byte[byteSlice.limit() / ELEMENT_SIZE]; |
| 368 | byteSlice.get(elements); |
| 369 | return elements; |
| 370 | } |
| 371 | } |
| 372 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 373 | private static class MaybeDecoder<U> extends Decoder<Optional<U>> { |
| 374 | |
| 375 | private final Decoder<U> elementDecoder; |
| 376 | |
| 377 | MaybeDecoder(Decoder<U> elementDecoder) { |
| 378 | this.elementDecoder = elementDecoder; |
| 379 | } |
| 380 | |
| 381 | @Override |
| 382 | public byte alignment() { |
| 383 | return elementDecoder.alignment(); |
| 384 | } |
| 385 | |
| 386 | @Override |
| 387 | @Nullable |
| 388 | Integer fixedSize() { |
| 389 | return null; |
| 390 | } |
| 391 | |
| 392 | @Override |
| 393 | public Optional<U> decode(ByteBuffer byteSlice) { |
| 394 | if (!byteSlice.hasRemaining()) { |
| 395 | return Optional.empty(); |
| 396 | } else { |
| 397 | if (!elementDecoder.hasFixedSize()) { |
| 398 | // Remove trailing zero byte. |
| 399 | byteSlice.limit(byteSlice.limit() - 1); |
| 400 | } |
| 401 | |
| 402 | return Optional.of(elementDecoder.decode(byteSlice)); |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | private static class StructureDecoder<U extends Record> extends Decoder<U> { |
| 408 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 409 | private final Class<U> recordType; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 410 | private final TupleDecoder tupleDecoder; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 411 | |
| 412 | StructureDecoder(Class<U> recordType, Decoder<?>... componentDecoders) { |
| 413 | var recordComponents = recordType.getRecordComponents(); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 414 | if (componentDecoders.length != recordComponents.length) { |
| 415 | throw new IllegalArgumentException( |
| 416 | "number of decoders (%d) does not match number of structure components (%d)" |
| 417 | .formatted(componentDecoders.length, recordComponents.length)); |
| 418 | } |
| 419 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 420 | this.recordType = recordType; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 421 | this.tupleDecoder = new TupleDecoder(componentDecoders); |
| 422 | } |
| 423 | |
| 424 | @Override |
| 425 | public byte alignment() { |
| 426 | return tupleDecoder.alignment(); |
| 427 | } |
| 428 | |
| 429 | @Override |
| 430 | public Integer fixedSize() { |
| 431 | return tupleDecoder.fixedSize(); |
| 432 | } |
| 433 | |
| 434 | @Override |
| 435 | public U decode(ByteBuffer byteSlice) { |
| 436 | Object[] recordConstructorArguments = tupleDecoder.decode(byteSlice); |
| 437 | |
| 438 | try { |
| 439 | var recordComponentTypes = |
| 440 | Arrays.stream(recordType.getRecordComponents()) |
| 441 | .map(RecordComponent::getType) |
| 442 | .toArray(Class<?>[]::new); |
| 443 | var recordConstructor = recordType.getDeclaredConstructor(recordComponentTypes); |
| 444 | return recordConstructor.newInstance(recordConstructorArguments); |
| 445 | } catch (NoSuchMethodException |
| 446 | | InstantiationException |
| 447 | | IllegalAccessException |
| 448 | | InvocationTargetException e) { |
| 449 | throw new IllegalStateException(e); |
| 450 | } |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | private static class TupleDecoder extends Decoder<Object[]> { |
| 455 | |
| 456 | private final Decoder<?>[] componentDecoders; |
| 457 | |
| 458 | TupleDecoder(Decoder<?>... componentDecoders) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 459 | this.componentDecoders = componentDecoders; |
| 460 | } |
| 461 | |
| 462 | @Override |
| 463 | public byte alignment() { |
| 464 | return (byte) Arrays.stream(componentDecoders).mapToInt(Decoder::alignment).max().orElse(1); |
| 465 | } |
| 466 | |
| 467 | @Override |
| 468 | public Integer fixedSize() { |
| 469 | int position = 0; |
| 470 | for (var componentDecoder : componentDecoders) { |
| 471 | var fixedComponentSize = componentDecoder.fixedSize(); |
| 472 | if (fixedComponentSize == null) { |
| 473 | return null; |
| 474 | } |
| 475 | |
| 476 | position = align(position, componentDecoder.alignment()); |
| 477 | position += fixedComponentSize; |
| 478 | } |
| 479 | |
| 480 | if (position == 0) { |
| 481 | return 1; |
| 482 | } |
| 483 | |
| 484 | return align(position, alignment()); |
| 485 | } |
| 486 | |
| 487 | @Override |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 488 | public Object[] decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 489 | int framingOffsetSize = byteCount(byteSlice.limit()); |
| 490 | |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 491 | var objects = new Object[componentDecoders.length]; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 492 | |
| 493 | int position = 0; |
| 494 | int framingOffsetIndex = 0; |
| 495 | int componentIndex = 0; |
| 496 | for (var componentDecoder : componentDecoders) { |
| 497 | position = align(position, componentDecoder.alignment()); |
| 498 | |
| 499 | var fixedComponentSize = componentDecoder.fixedSize(); |
| 500 | if (fixedComponentSize != null) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 501 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 502 | componentDecoder.decode( |
| 503 | slicePreservingOrder(byteSlice, position, fixedComponentSize)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 504 | position += fixedComponentSize; |
| 505 | } else { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 506 | if (componentIndex == componentDecoders.length - 1) { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 507 | // The last component never has a framing offset. |
| 508 | int endPosition = byteSlice.limit() - framingOffsetIndex * framingOffsetSize; |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 509 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 510 | componentDecoder.decode( |
| 511 | slicePreservingOrder(byteSlice, position, endPosition - position)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 512 | position = endPosition; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 513 | } else { |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 514 | int framingOffset = |
| 515 | getIntN( |
| 516 | byteSlice.slice( |
| 517 | byteSlice.limit() - (1 + framingOffsetIndex) * framingOffsetSize, |
| 518 | framingOffsetSize)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 519 | objects[componentIndex] = |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 520 | componentDecoder.decode( |
| 521 | slicePreservingOrder(byteSlice, position, framingOffset - position)); |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 522 | position = framingOffset; |
| 523 | ++framingOffsetIndex; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 524 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 525 | } |
| 526 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 527 | ++componentIndex; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 528 | } |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 529 | |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 530 | return objects; |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 531 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 532 | } |
| 533 | |
Matthias Andreas Benkard | cd924f6 | 2021-12-28 00:46:06 +0100 | [diff] [blame^] | 534 | private static class DictionaryEntryDecoder<K, V> extends Decoder<Map.Entry<K, V>> { |
| 535 | |
| 536 | private final TupleDecoder tupleDecoder; |
| 537 | |
| 538 | DictionaryEntryDecoder(Decoder<K> keyDecoder, Decoder<V> valueDecoder) { |
| 539 | this.tupleDecoder = new TupleDecoder(keyDecoder, valueDecoder); |
| 540 | } |
| 541 | |
| 542 | @Override |
| 543 | public byte alignment() { |
| 544 | return tupleDecoder.alignment(); |
| 545 | } |
| 546 | |
| 547 | @Override |
| 548 | public Integer fixedSize() { |
| 549 | return tupleDecoder.fixedSize(); |
| 550 | } |
| 551 | |
| 552 | @Override |
| 553 | @SuppressWarnings("unchecked") |
| 554 | public Map.Entry<K, V> decode(ByteBuffer byteSlice) { |
| 555 | Object[] components = tupleDecoder.decode(byteSlice); |
| 556 | return new SimpleImmutableEntry<>((K) components[0], (V) components[1]); |
| 557 | } |
| 558 | } |
| 559 | |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 560 | private static class VariantDecoder extends Decoder<Variant> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 561 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 562 | @Override |
| 563 | public byte alignment() { |
| 564 | return 8; |
| 565 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 566 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 567 | @Override |
| 568 | @Nullable |
| 569 | Integer fixedSize() { |
| 570 | return null; |
| 571 | } |
| 572 | |
| 573 | @Override |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 574 | public Variant decode(ByteBuffer byteSlice) { |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 575 | for (int i = byteSlice.limit() - 1; i >= 0; --i) { |
| 576 | if (byteSlice.get(i) != 0) { |
| 577 | continue; |
| 578 | } |
| 579 | |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 580 | var dataBytes = slicePreservingOrder(byteSlice, 0, i); |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 581 | var signatureBytes = byteSlice.slice(i + 1, byteSlice.limit() - (i + 1)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 582 | |
Matthias Andreas Benkard | 31c61e7 | 2021-12-16 20:06:39 +0100 | [diff] [blame] | 583 | Signature signature; |
| 584 | try { |
| 585 | signature = Signature.parse(signatureBytes); |
| 586 | } catch (ParseException e) { |
| 587 | throw new IllegalArgumentException(e); |
| 588 | } |
| 589 | |
| 590 | return new Variant(signature, signature.decoder().decode(dataBytes)); |
Matthias Andreas Benkard | 55c3481 | 2021-12-14 21:51:10 +0100 | [diff] [blame] | 591 | } |
| 592 | |
| 593 | throw new IllegalArgumentException("variant signature not found"); |
| 594 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 595 | } |
| 596 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 597 | private static class BooleanDecoder extends Decoder<Boolean> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 598 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 599 | @Override |
| 600 | public byte alignment() { |
| 601 | return 1; |
| 602 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 603 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 604 | @Override |
| 605 | public Integer fixedSize() { |
| 606 | return 1; |
| 607 | } |
| 608 | |
| 609 | @Override |
| 610 | public Boolean decode(ByteBuffer byteSlice) { |
| 611 | return byteSlice.get() != 0; |
| 612 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 613 | } |
| 614 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 615 | private static class ByteDecoder extends Decoder<Byte> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 616 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 617 | @Override |
| 618 | public byte alignment() { |
| 619 | return 1; |
| 620 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 621 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 622 | @Override |
| 623 | public Integer fixedSize() { |
| 624 | return 1; |
| 625 | } |
| 626 | |
| 627 | @Override |
| 628 | public Byte decode(ByteBuffer byteSlice) { |
| 629 | return byteSlice.get(); |
| 630 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 631 | } |
| 632 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 633 | private static class ShortDecoder extends Decoder<Short> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 634 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 635 | @Override |
| 636 | public byte alignment() { |
| 637 | return 2; |
| 638 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 639 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 640 | @Override |
| 641 | public Integer fixedSize() { |
| 642 | return 2; |
| 643 | } |
| 644 | |
| 645 | @Override |
| 646 | public Short decode(ByteBuffer byteSlice) { |
| 647 | return byteSlice.getShort(); |
| 648 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 649 | } |
| 650 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 651 | private static class IntegerDecoder extends Decoder<Integer> { |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 652 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 653 | @Override |
| 654 | public byte alignment() { |
| 655 | return 4; |
| 656 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 657 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 658 | @Override |
| 659 | public Integer fixedSize() { |
| 660 | return 4; |
| 661 | } |
| 662 | |
| 663 | @Override |
| 664 | public Integer decode(ByteBuffer byteSlice) { |
| 665 | return byteSlice.getInt(); |
| 666 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 667 | } |
| 668 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 669 | private static class LongDecoder extends Decoder<Long> { |
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 byte alignment() { |
| 673 | return 8; |
| 674 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 675 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 676 | @Override |
| 677 | public Integer fixedSize() { |
| 678 | return 8; |
| 679 | } |
| 680 | |
| 681 | @Override |
| 682 | public Long decode(ByteBuffer byteSlice) { |
| 683 | return byteSlice.getLong(); |
| 684 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 685 | } |
| 686 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 687 | private static class DoubleDecoder extends Decoder<Double> { |
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 byte alignment() { |
| 691 | return 8; |
| 692 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 693 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 694 | @Override |
| 695 | public Integer fixedSize() { |
| 696 | return 8; |
| 697 | } |
| 698 | |
| 699 | @Override |
| 700 | public Double decode(ByteBuffer byteSlice) { |
| 701 | return byteSlice.getDouble(); |
| 702 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 703 | } |
| 704 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 705 | private static class StringDecoder extends Decoder<String> { |
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 | private final Charset charset; |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 708 | |
Matthias Andreas Benkard | 3443018 | 2021-12-14 20:00:36 +0100 | [diff] [blame] | 709 | public StringDecoder(Charset charset) { |
| 710 | this.charset = charset; |
| 711 | } |
| 712 | |
| 713 | @Override |
| 714 | public byte alignment() { |
| 715 | return 1; |
| 716 | } |
| 717 | |
| 718 | @Override |
| 719 | @Nullable |
| 720 | Integer fixedSize() { |
| 721 | return null; |
| 722 | } |
| 723 | |
| 724 | @Override |
| 725 | public String decode(ByteBuffer byteSlice) { |
| 726 | byteSlice.limit(byteSlice.limit() - 1); |
| 727 | return charset.decode(byteSlice).toString(); |
| 728 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 729 | } |
Matthias Andreas Benkard | 6f993f7 | 2021-12-27 22:40:14 +0100 | [diff] [blame] | 730 | |
| 731 | private class MappingDecoder<U> extends Decoder<U> { |
| 732 | |
| 733 | private final Function<T, U> function; |
| 734 | |
| 735 | public MappingDecoder(Function<T, U> function) { |
| 736 | this.function = function; |
| 737 | } |
| 738 | |
| 739 | @Override |
| 740 | public byte alignment() { |
| 741 | return Decoder.this.alignment(); |
| 742 | } |
| 743 | |
| 744 | @Override |
| 745 | public @Nullable Integer fixedSize() { |
| 746 | return Decoder.this.fixedSize(); |
| 747 | } |
| 748 | |
| 749 | @Override |
| 750 | public U decode(ByteBuffer byteSlice) { |
| 751 | return function.apply(Decoder.this.decode(byteSlice)); |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | private class ByteOrderFixingDecoder extends Decoder<T> { |
| 756 | |
| 757 | private final ByteOrder byteOrder; |
| 758 | |
| 759 | public ByteOrderFixingDecoder(ByteOrder byteOrder) { |
| 760 | this.byteOrder = byteOrder; |
| 761 | } |
| 762 | |
| 763 | @Override |
| 764 | public byte alignment() { |
| 765 | return Decoder.this.alignment(); |
| 766 | } |
| 767 | |
| 768 | @Override |
| 769 | public @Nullable Integer fixedSize() { |
| 770 | return Decoder.this.fixedSize(); |
| 771 | } |
| 772 | |
| 773 | @Override |
| 774 | public T decode(ByteBuffer byteSlice) { |
| 775 | var newByteSlice = byteSlice.duplicate(); |
| 776 | newByteSlice.order(byteOrder); |
| 777 | return Decoder.this.decode(newByteSlice); |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | private static ByteBuffer slicePreservingOrder(ByteBuffer byteSlice, int index, int length) { |
| 782 | return byteSlice.slice(index, length).order(byteSlice.order()); |
| 783 | } |
Matthias Andreas Benkard | 261532a | 2021-12-12 20:09:27 +0100 | [diff] [blame] | 784 | } |