/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.wildfly.clustering.marshalling.jboss;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.nio.ByteBuffer;

/**
 * Like {@link SimpleMarshalledValue}, but also serializes the underlying object's hash code,
 * so that this object can still be hashed, even if deserialized, but not yet rehydrated.
 * @author Paul Ferraro
 */
public class HashableMarshalledValue<T> extends SimpleMarshalledValue<T> {
    private static final long serialVersionUID = -7576022002375288323L;

    private transient int hashCode;

    public HashableMarshalledValue(T object, MarshallingContext context) {
        super(object, context);
        this.hashCode = (object != null ) ? object.hashCode() : 0;
    }

    HashableMarshalledValue(ByteBuffer buffer, int hashCode) {
        super(buffer);
        this.hashCode = hashCode;
    }

    @Override
    public int hashCode() {
        return this.hashCode;
    }

    @Override
    public boolean equals(Object object) {
        if (object instanceof HashableMarshalledValue) {
            HashableMarshalledValue<?> value = (HashableMarshalledValue<?>) object;
            // Testing hashCode equivalence is just an optimization
            if (this.hashCode != value.hashCode) return false;
        }
        return super.equals(object);
    }

    private void writeObject(ObjectOutputStream out) throws IOException {
        out.defaultWriteObject();
        out.writeInt(this.hashCode);
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        in.defaultReadObject();
        this.hashCode = in.readInt();
    }
}
