Add support for Guava's ReverseList.

src/main/java/de/javakaffee/kryoserializers/guava/ReverseListSerializer.java

@@ -0,0 +1,78 @@
+package de.javakaffee.kryoserializers.guava;
+
+import com.google.common.collect.Lists;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import com.esotericsoftware.kryo.serializers.CollectionSerializer;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * A {@link Lists.ReverseList} Serializer.
+ * Treat as a {@link List} by reversing before write and after read.
+ */
+public abstract class ReverseListSerializer extends Serializer<Object> {
+
+    private static final CollectionSerializer serializer = new CollectionSerializer();
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void write(Kryo kryo, Output output, Object object) {
+        // reverse the ReverseList to get the "forward" list, and treat as regular List.
+        List forwardList = Lists.reverse((List<Object>) object);
+        serializer.write(kryo, output, forwardList);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Object copy(Kryo kryo, Object original) {
+        List forwardList = Lists.reverse((List) original);
+        return Lists.reverse((List<Object>) serializer.copy(kryo, forwardList));
+    }
+
+    public static void registerSerializers(final Kryo kryo) {
+        kryo.register(Lists.reverse(Lists.newLinkedList()).getClass(), forReverseList());
+        kryo.register(Lists.reverse(Lists.newArrayList()).getClass(), forRandomAccessReverseList());
+    }
+
+    public static ReverseListSerializer forReverseList() {
+      return new ReverseListSerializer.ReverseList();
+    }
+
+    public static ReverseListSerializer forRandomAccessReverseList() {
+      return new ReverseListSerializer.RandomAccessReverseList();
+    }
+
+    /**
+     * A {@link Lists.ReverseList} implementation based on a {@link LinkedList}.
+     */
+    private static class ReverseList extends ReverseListSerializer {
+
+        @SuppressWarnings("unchecked")
+        @Override
+        public Object read(Kryo kryo, Input input, Class<Object> type) {
+            // reading a "forward" list as a LinkedList and returning the reversed list.
+            List forwardList = (List) serializer.read(kryo, input, (Class) LinkedList.class);
+            return Lists.reverse(forwardList);
+        }
+    }
+
+    /**
+     * A {@link Lists.ReverseList} implementation based on an {@link ArrayList}.
+     */
+    private static class RandomAccessReverseList extends ReverseListSerializer {
+
+        @SuppressWarnings("unchecked")
+        @Override
+        public Object read(Kryo kryo, Input input, Class<Object> type) {
+            // reading a "forward" list as a ArrayList and returning the reversed list.
+            List forwardList = (List) serializer.read(kryo, input, (Class) ArrayList.class);
+            return Lists.reverse(forwardList);
+        }
+    }
+}

src/test/java/de/javakaffee/kryoserializers/guava/ReverseListSerializerTest.java

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+package de.javakaffee.kryoserializers.guava;
+
+import com.google.common.collect.Lists;
+
+import com.esotericsoftware.kryo.Kryo;
+
+import org.testng.annotations.BeforeTest;
+import org.testng.annotations.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static de.javakaffee.kryoserializers.KryoTest.deserialize;
+import static de.javakaffee.kryoserializers.KryoTest.serialize;
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertTrue;
+
+
+/**
+ * Test for {@link ReverseListSerializer}.
+ */
+public class ReverseListSerializerTest {
+
+    private Kryo _kryo;
+
+    @BeforeTest
+    public void setUp() throws Exception {
+        _kryo = new Kryo();
+
+        ReverseListSerializer.registerSerializers(_kryo);
+    }
+
+    @Test( enabled = true )
+    public void testEmptyReverseList() {
+        testEmpty(Lists.reverse(Lists.newLinkedList()));
+    }
+
+    @Test( enabled = true )
+    public void testEmptyRandomAccessReverseList() {
+        testEmpty(Lists.reverse(Lists.newArrayList()));
+    }
+
+    private void testEmpty(final List<?> reverseList) {
+        final byte[] serialized = serialize( _kryo, reverseList );
+        final List<?> deserialized = deserialize(_kryo, serialized, reverseList.getClass());
+        assertEquals(deserialized.getClass(), reverseList.getClass());
+        assertTrue(deserialized.isEmpty());
+        assertEquals(deserialized.size(), reverseList.size());
+    }
+
+    @Test( enabled = true )
+    public void testSingletonReverseList() {
+        testSingleton(Lists.reverse(Lists.newLinkedList(Collections.singleton(3))));
+    }
+
+    @Test( enabled = true )
+    public void testSingletonRandomAccessReverseList() {
+        testSingleton(Lists.reverse(Lists.newArrayList(Collections.singleton(3))));
+    }
+
+    private void testSingleton(final List<?> reverseList) {
+        final byte[] serialized = serialize( _kryo, reverseList );
+        final List<?> deserialized = deserialize(_kryo, serialized, reverseList.getClass());
+        assertEquals(deserialized.getClass(), reverseList.getClass());
+        assertEquals(deserialized, reverseList);
+    }
+
+    @Test( enabled = true )
+    public void testRegularReverseList() {
+        testRegular(Lists.reverse(Lists.newLinkedList(Arrays.asList(3, 4, 5, 6))));
+    }
+
+    @Test( enabled = true )
+    public void testRegularRandomAccessReverseList() {
+        testRegular(Lists.reverse(Lists.newArrayList(3, 4, 5, 6)));
+    }
+
+    private void testRegular(final List<?> reverseList) {
+        final byte[] serialized = serialize( _kryo, reverseList );
+        final List<?> deserialized = deserialize(_kryo, serialized, reverseList.getClass());
+        assertEquals(deserialized.getClass(), reverseList.getClass());
+        assertEquals(deserialized, reverseList);
+    }
+
+    // Kryo#copy tests
+
+    @Test( enabled = true )
+    public void testCopyEmptyReverseList() {
+        testCopy(Lists.reverse(Lists.newLinkedList()));
+    }
+
+    @Test( enabled = true )
+    public void testCopyEmptyRandomAccessReverseList() {
+        testCopy(Lists.reverse(Lists.newArrayList()));
+    }
+
+    @Test( enabled = true )
+    public void testCopySingletonReverseList() {
+        testCopy(Lists.reverse(Lists.newLinkedList(Collections.singleton(3))));
+    }
+
+    @Test( enabled = true )
+    public void testCopySingletonRandomAccessReverseList() {
+        testCopy(Lists.reverse(Lists.newArrayList(Collections.singleton(3))));
+    }
+
+    @Test( enabled = true )
+    public void testCopyRegularReverseList() {
+        testCopy(Lists.reverse(Lists.newLinkedList(Arrays.asList(3, 4, 5, 6))));
+    }
+
+    @Test( enabled = true )
+    public void testCopyRegularRandomAccessReverseList() {
+        testCopy(Lists.reverse(Lists.newArrayList(3, 4, 5, 6)));
+    }
+
+    private void testCopy(List<?> obj) {
+        final List<?> copied = _kryo.copy(obj);
+        assertEquals(copied.getClass(), obj.getClass());
+        assertEquals(copied, obj);
+    }
+}