java: implements MessagePackObject::hashCode()

java/src/main/java/org/msgpack/object/ArrayType.java

@@ -60,6 +60,11 @@ public class ArrayType extends MessagePackObject {
 		return Arrays.equals(((ArrayType)obj).array, array);
 	}
 
+	@Override
+	public int hashCode() {
+		return array.hashCode();
+	}
+
 	@Override
 	public Object clone() {
 		MessagePackObject[] copy = new MessagePackObject[array.length];

java/src/main/java/org/msgpack/object/BigIntegerTypeIMPL.java

@@ -103,6 +103,11 @@ class BigIntegerTypeIMPL extends IntegerType {
 		return ((BigIntegerTypeIMPL)obj).value.equals(value);
 	}
 
+	@Override
+	public int hashCode() {
+		return value.hashCode();
+	}
+
 	@Override
 	public Object clone() {
 		return new BigIntegerTypeIMPL(value);

java/src/main/java/org/msgpack/object/BooleanType.java

@@ -50,6 +50,15 @@ public class BooleanType extends MessagePackObject {
 		return ((BooleanType)obj).value == value;
 	}
 
+	@Override
+	public int hashCode() {
+		if(value) {
+			return 1231;
+		} else {
+			return 1237;
+		}
+	}
+
 	@Override
 	public Object clone() {
 		return new BooleanType(value);

java/src/main/java/org/msgpack/object/DoubleTypeIMPL.java

@@ -82,6 +82,12 @@ class DoubleTypeIMPL extends FloatType {
 		return ((DoubleTypeIMPL)obj).value == value;
 	}
 
+	@Override
+	public int hashCode() {
+		long v = Double.doubleToLongBits(value);
+		return (int)(v^(v>>>32));
+	}
+
 	@Override
 	public Object clone() {
 		return new DoubleTypeIMPL(value);

java/src/main/java/org/msgpack/object/FloatTypeIMPL.java

@@ -81,6 +81,11 @@ class FloatTypeIMPL extends FloatType {
 		return ((FloatTypeIMPL)obj).value == value;
 	}
 
+	@Override
+	public int hashCode() {
+		return Float.floatToIntBits(value);
+	}
+
 	@Override
 	public Object clone() {
 		return new FloatTypeIMPL(value);

java/src/main/java/org/msgpack/object/LongIntegerTypeIMPL.java

@@ -100,6 +100,11 @@ class LongIntegerTypeIMPL extends IntegerType {
 		return ((LongIntegerTypeIMPL)obj).value == value;
 	}
 
+	@Override
+	public int hashCode() {
+		return (int)(value^(value>>>32));
+	}
+
 	@Override
 	public Object clone() {
 		return new LongIntegerTypeIMPL(value);

java/src/main/java/org/msgpack/object/MapType.java

@@ -63,6 +63,11 @@ public class MapType extends MessagePackObject {
 		return Arrays.equals(((MapType)obj).map, map);
 	}
 
+	@Override
+	public int hashCode() {
+		return map.hashCode();
+	}
+
 	@Override
 	public Object clone() {
 		MessagePackObject[] copy = new MessagePackObject[map.length];

java/src/main/java/org/msgpack/object/NilType.java

@@ -39,6 +39,11 @@ public class NilType extends MessagePackObject {
 		return true;
 	}
 
+	@Override
+	public int hashCode() {
+		return 0;
+	}
+
 	@Override
 	public Object clone() {
 		return new NilType();

java/src/main/java/org/msgpack/object/RawType.java

@@ -61,6 +61,11 @@ public class RawType extends MessagePackObject {
 		return ((RawType)obj).bytes.equals(bytes);
 	}
 
+	@Override
+	public int hashCode() {
+		return bytes.hashCode();
+	}
+
 	@Override
 	public Object clone() {
 		return new RawType((byte[])bytes.clone());

java/src/main/java/org/msgpack/object/ShortIntegerTypeIMPL.java

@@ -102,6 +102,11 @@ class ShortIntegerTypeIMPL extends IntegerType {
 		return ((ShortIntegerTypeIMPL)obj).value == value;
 	}
 
+	@Override
+	public int hashCode() {
+		return value;
+	}
+
 	@Override
 	public Object clone() {
 		return new ShortIntegerTypeIMPL(value);