Add jgvariant-ostree module.
Change-Id: Idf7bacad28d7cf65eb1ddd0994dcc2c2c2a7e18e
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 d2f2403..fc11eab 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
@@ -12,6 +12,7 @@
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
+import java.util.function.Function;
import org.apiguardian.api.API;
import org.apiguardian.api.API.Status;
import org.jetbrains.annotations.Nullable;
@@ -80,7 +81,7 @@
* @param byteOrder the byte order to use.
* @return a new, decorated {@link Decoder}.
*/
- public Decoder<T> withByteOrder(ByteOrder byteOrder) {
+ public final Decoder<T> withByteOrder(ByteOrder byteOrder) {
var delegate = this;
return new Decoder<>() {
@@ -103,6 +104,34 @@
}
/**
+ * Creates a new {@link Decoder} from an existing one by applying a function to the result.
+ *
+ * @param function the function to apply.
+ * @return a new, decorated {@link Decoder}.
+ * @see java.util.stream.Stream#map
+ */
+ public final <U> Decoder<U> map(Function<T, U> function) {
+ var delegate = this;
+
+ return new Decoder<>() {
+ @Override
+ public byte alignment() {
+ return delegate.alignment();
+ }
+
+ @Override
+ public @Nullable Integer fixedSize() {
+ return delegate.fixedSize();
+ }
+
+ @Override
+ public U decode(ByteBuffer byteSlice) {
+ return function.apply(delegate.decode(byteSlice));
+ }
+ };
+ }
+
+ /**
* Creates a {@link Decoder} for an {@code Array} type.
*
* @param elementDecoder a {@link Decoder} for the elements of the array.
@@ -114,6 +143,16 @@
}
/**
+ * Creates a {@link Decoder} for an {@code Array} type of element type {@code byte} into a
+ * primitive {@code byte[]} array.
+ *
+ * @return a new {@link Decoder}.
+ */
+ public static Decoder<byte[]> ofByteArray() {
+ return new ByteArrayDecoder();
+ }
+
+ /**
* Creates a {@link Decoder} for a {@code Maybe} type.
*
* @param elementDecoder a {@link Decoder} for the contained element.
@@ -299,6 +338,9 @@
var element = elementDecoder.decode(byteSlice.slice(i, elementSize));
elements.add(element);
}
+ } else if (byteSlice.limit() == 0) {
+ // A degenerate zero-length array of variable width.
+ elements = List.of();
} else {
// An array with aligned elements and a vector of framing offsets in the end.
int framingOffsetSize = byteCount(byteSlice.limit());
@@ -321,6 +363,30 @@
}
}
+ private static class ByteArrayDecoder extends Decoder<byte[]> {
+
+ private static final int ELEMENT_SIZE = 1;
+
+ @Override
+ public byte alignment() {
+ return ELEMENT_SIZE;
+ }
+
+ @Override
+ @Nullable
+ Integer fixedSize() {
+ return null;
+ }
+
+ @Override
+ public byte[] decode(ByteBuffer byteSlice) {
+ // A simple C-style array.
+ byte[] elements = new byte[byteSlice.limit() / ELEMENT_SIZE];
+ byteSlice.get(elements);
+ return elements;
+ }
+ }
+
private static class MaybeDecoder<U> extends Decoder<Optional<U>> {
private final Decoder<U> elementDecoder;