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-rw-r--r--jgvariant-core/src/main/java/eu/mulk/jgvariant/core/Decoder.java40
1 files changed, 40 insertions, 0 deletions
diff --git a/jgvariant-core/src/main/java/eu/mulk/jgvariant/core/Decoder.java b/jgvariant-core/src/main/java/eu/mulk/jgvariant/core/Decoder.java
index 96e1332..8297d79 100644
--- a/jgvariant-core/src/main/java/eu/mulk/jgvariant/core/Decoder.java
+++ b/jgvariant-core/src/main/java/eu/mulk/jgvariant/core/Decoder.java
@@ -1,6 +1,7 @@
package eu.mulk.jgvariant.core;
import static java.nio.ByteOrder.LITTLE_ENDIAN;
+import static java.util.stream.Collectors.toMap;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.RecordComponent;
@@ -13,6 +14,7 @@ import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
+import java.util.Map.Entry;
import java.util.Optional;
import java.util.function.Function;
import org.apiguardian.api.API;
@@ -110,6 +112,18 @@ public abstract class Decoder<T> {
}
/**
+ * Creates a {@link Decoder} for a {@code Dictionary} type.
+ *
+ * @param keyDecoder a {@link Decoder} for the key component of the dictionary entry.
+ * @param valueDecoder a {@link Decoder} for the value component of the dictionary entry.
+ * @return a new {@link Decoder}.
+ */
+ public static <K, V> Decoder<Map<K, V>> ofDictionary(
+ Decoder<K> keyDecoder, Decoder<V> valueDecoder) {
+ return new DictionaryDecoder<>(keyDecoder, valueDecoder);
+ }
+
+ /**
* Creates a {@link Decoder} for an {@code Array} type of element type {@code byte} into a
* primitive {@code byte[]} array.
*
@@ -346,6 +360,32 @@ public abstract class Decoder<T> {
}
}
+ private static class DictionaryDecoder<K, V> extends Decoder<Map<K, V>> {
+
+ private final ArrayDecoder<Map.Entry<K, V>> entryArrayDecoder;
+
+ DictionaryDecoder(Decoder<K> keyDecoder, Decoder<V> valueDecoder) {
+ this.entryArrayDecoder =
+ new ArrayDecoder<>(new DictionaryEntryDecoder<>(keyDecoder, valueDecoder));
+ }
+
+ @Override
+ public byte alignment() {
+ return entryArrayDecoder.alignment();
+ }
+
+ @Override
+ public Integer fixedSize() {
+ return entryArrayDecoder.fixedSize();
+ }
+
+ @Override
+ public Map<K, V> decode(ByteBuffer byteSlice) {
+ List<Map.Entry<K, V>> entries = entryArrayDecoder.decode(byteSlice);
+ return entries.stream().collect(toMap(Entry::getKey, Entry::getValue));
+ }
+ }
+
private static class ByteArrayDecoder extends Decoder<byte[]> {
private static final int ELEMENT_SIZE = 1;