de.javakaffee.kryoserializers.ArraysAsListSerializer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of kryo-serializers Show documentation
Show all versions of kryo-serializers Show documentation
Additional kryo (http://kryo.googlecode.com) serializers for standard jdk types (e.g. currency, jdk proxies) and some for external libs (e.g. joda time, cglib proxies, wicket).
/*
* Copyright 2010 Martin Grotzke
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package de.javakaffee.kryoserializers;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.List;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
/**
* A kryo {@link Serializer} for lists created via {@link Arrays#asList(Object...)}.
*
* Note: This serializer does not support cyclic references, so if one of the objects
* gets set the list as attribute this might cause an error during deserialization.
*
*
* @author Martin Grotzke
*/
public class ArraysAsListSerializer extends Serializer> {
private Field _arrayField;
public ArraysAsListSerializer() {
try {
_arrayField = Class.forName( "java.util.Arrays$ArrayList" ).getDeclaredField( "a" );
_arrayField.setAccessible( true );
} catch ( final Exception e ) {
throw new RuntimeException( e );
}
// Immutable causes #copy(obj) to return the original object
setImmutable(true);
}
@Override
public List read(final Kryo kryo, final Input input, final Class> type) {
final int length = input.readInt(true);
Class componentType = kryo.readClass( input ).getType();
if (componentType.isPrimitive()) {
componentType = getPrimitiveWrapperClass(componentType);
}
try {
final Object items = Array.newInstance( componentType, length );
for( int i = 0; i < length; i++ ) {
Array.set(items, i, kryo.readClassAndObject( input ));
}
return Arrays.asList( (Object[])items );
} catch ( final Exception e ) {
throw new RuntimeException( e );
}
}
@Override
public void write(final Kryo kryo, final Output output, final List obj) {
try {
final Object[] array = (Object[]) _arrayField.get( obj );
output.writeInt(array.length, true);
final Class componentType = array.getClass().getComponentType();
kryo.writeClass( output, componentType );
for( final Object item : array ) {
kryo.writeClassAndObject( output, item );
}
} catch ( final RuntimeException e ) {
// Don't eat and wrap RuntimeExceptions because the ObjectBuffer.write...
// handles SerializationException specifically (resizing the buffer)...
throw e;
} catch ( final Exception e ) {
throw new RuntimeException( e );
}
}
private static Class getPrimitiveWrapperClass(final Class c) {
if (c.isPrimitive()) {
if (c.equals(Long.TYPE)) {
return Long.class;
} else if (c.equals(Integer.TYPE)) {
return Integer.class;
} else if (c.equals(Double.TYPE)) {
return Double.class;
} else if (c.equals(Float.TYPE)) {
return Float.class;
} else if (c.equals(Boolean.TYPE)) {
return Boolean.class;
} else if (c.equals(Character.TYPE)) {
return Character.class;
} else if (c.equals(Short.TYPE)) {
return Short.class;
} else if (c.equals(Byte.TYPE)) {
return Byte.class;
}
}
return c;
}
}