Add Decoder#ofPredicate, Decoder#contramap.
Change-Id: Ifd4e372a6a3c3028d1cd74e6d9a0145c3f571ff5
diff --git a/jgvariant-core/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java b/jgvariant-core/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java
index efbcafa..8c78692 100644
--- a/jgvariant-core/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java
+++ b/jgvariant-core/src/test/java/eu/mulk/jgvariant/core/DecoderTest.java
@@ -507,4 +507,71 @@
var decoder = Decoder.ofByteArray().map(bytes -> bytes.length);
assertEquals(3, decoder.decode(ByteBuffer.wrap(data)));
}
+
+ @Test
+ void testContramap() {
+ var data = new byte[] {0x0A, 0x0B, 0x0C};
+ var decoder = Decoder.ofByteArray().contramap(bytes -> bytes.slice(1, 1));
+ assertArrayEquals(new byte[] {0x0B}, decoder.decode(ByteBuffer.wrap(data)));
+ }
+
+ @Test
+ void testPredicateTrue() {
+ var data = new byte[] {0x00, 0x01, 0x00};
+ var innerDecoder = Decoder.ofShort().contramap(bytes -> bytes.slice(1, 2).order(bytes.order()));
+ var decoder =
+ Decoder.ofPredicate(
+ byteBuffer -> byteBuffer.get(0) == 0,
+ innerDecoder.withByteOrder(LITTLE_ENDIAN),
+ innerDecoder.withByteOrder(BIG_ENDIAN));
+ assertEquals((short) 1, decoder.decode(ByteBuffer.wrap(data)));
+ }
+
+ @Test
+ void testPredicateFalse() {
+ var data = new byte[] {0x01, 0x01, 0x00};
+ var innerDecoder = Decoder.ofShort().contramap(bytes -> bytes.slice(1, 2).order(bytes.order()));
+ var decoder =
+ Decoder.ofPredicate(
+ byteBuffer -> byteBuffer.get(0) == 0,
+ innerDecoder.withByteOrder(LITTLE_ENDIAN),
+ innerDecoder.withByteOrder(BIG_ENDIAN));
+ assertEquals((short) 256, decoder.decode(ByteBuffer.wrap(data)));
+ }
+
+ @Test
+ void testByteOrder() {
+ var data =
+ new byte[] {
+ 0x01, 0x00, 0x02, 0x00, 0x00, 0x03, 0x00, 0x04, 0x05, 0x00, 0x00, 0x06, 0x00, 0x07, 0x08,
+ 0x00
+ };
+
+ record TestChild(short s1, short s2) {}
+ record TestParent(TestChild tc1, TestChild tc2, TestChild tc3, TestChild tc4) {}
+
+ var decoder =
+ Decoder.ofStructure(
+ TestParent.class,
+ Decoder.ofStructure(TestChild.class, Decoder.ofShort(), Decoder.ofShort())
+ .withByteOrder(LITTLE_ENDIAN),
+ Decoder.ofStructure(TestChild.class, Decoder.ofShort(), Decoder.ofShort())
+ .withByteOrder(BIG_ENDIAN),
+ Decoder.ofStructure(
+ TestChild.class,
+ Decoder.ofShort().withByteOrder(LITTLE_ENDIAN),
+ Decoder.ofShort())
+ .withByteOrder(BIG_ENDIAN),
+ Decoder.ofStructure(
+ TestChild.class, Decoder.ofShort().withByteOrder(BIG_ENDIAN), Decoder.ofShort())
+ .withByteOrder(LITTLE_ENDIAN));
+
+ assertEquals(
+ new TestParent(
+ new TestChild((short) 1, (short) 2),
+ new TestChild((short) 3, (short) 4),
+ new TestChild((short) 5, (short) 6),
+ new TestChild((short) 7, (short) 8)),
+ decoder.decode(ByteBuffer.wrap(data)));
+ }
}