/*
* 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 static com.esotericsoftware.minlog.Log.TRACE;
import static com.esotericsoftware.minlog.Log.trace;
import java.lang.reflect.Field;
import java.util.EnumSet;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
/**
* A serializer for {@link EnumSet}s.
*
* @author <a href="mailto:martin.grotzke@javakaffee.de">Martin Grotzke</a>
*/
@SuppressWarnings( { "unchecked", "rawtypes" } )
public class EnumSetSerializer extends Serializer<EnumSet<? extends Enum<?>>> {
private static final Field TYPE_FIELD;
static {
try {
TYPE_FIELD = EnumSet.class.getDeclaredField( "elementType" );
TYPE_FIELD.setAccessible( true );
} catch ( final Exception e ) {
throw new RuntimeException( "The EnumSet class seems to have changed, could not access expected field.", e );
}
}
@Override
public EnumSet<? extends Enum<?>> copy (final Kryo kryo, final EnumSet<? extends Enum<?>> original) {
return original.clone();
}
@Override
public EnumSet read(final Kryo kryo, final Input input, final Class<EnumSet<? extends Enum<?>>> type) {
final Class<Enum> elementType = kryo.readClass( input ).getType();
final EnumSet result = EnumSet.noneOf( elementType );
final int size = input.readInt(true);
final Enum<?>[] enumConstants = elementType.getEnumConstants();
for ( int i = 0; i < size; i++ ) {
result.add( enumConstants[input.readInt(true)] );
}
return result;
}
@Override
public void write(final Kryo kryo, final Output output, final EnumSet<? extends Enum<?>> set) {
kryo.writeClass( output, getElementType( set ) );
output.writeInt( set.size(), true );
for (final Enum item : set) {
output.writeInt(item.ordinal(), true);
}
if ( TRACE ) trace( "kryo", "Wrote EnumSet: " + set );
}
private Class<? extends Enum<?>> getElementType( final EnumSet<? extends Enum<?>> set ) {
try {
return (Class)TYPE_FIELD.get( set );
} catch ( final Exception e ) {
throw new RuntimeException( "Could not access keys field.", e );
}
}
}