library/src/main/java/com/datatorrent/lib/codec/KryoJdkContainer.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.datatorrent.lib.codec;

import java.io.Serializable;

import com.esotericsoftware.kryo.DefaultSerializer;
import com.esotericsoftware.kryo.serializers.JavaSerializer;

/**
 * KryoJdkContainer wraps a Java serializable object and sets up a Kryo Serializer.
 *
 * This class implements a simple wrapper that is serializable by Kryo for a Java serializable object
 * that isn't directly serializable in Kryo. This could be for reasons such as the object not having a
 * default constructor or a member object in the the object not having a default constructor.<br>
 * <br>
 * This container can be used when the object code cannot be modified to use the
 * KryoJdkSerializer directly.<br>
 * <br>
 *
 * @param <T> - Type of the object which you would like to serialize using KryoJdkSerializer.
 * @since 0.9.4
 */
@DefaultSerializer(JavaSerializer.class)
public class KryoJdkContainer<T> implements Serializable
{
  private static final long serialVersionUID = 201306031549L;
  private T t;

  /**
   * <p>Constructor for KryoJdkContainer.</p>
   */
  public KryoJdkContainer()
  {
  }

  /**
   * <p>Constructor for KryoJdkContainer.</p>
   */
  public KryoJdkContainer(T t)
  {
    this.t = t;
  }

  /**
   * <p>setComponent.</p>
   */
  public void setComponent(T t)
  {
    this.t = t;
  }

  /**
   * <p>getComponent.</p>
   */
  public T getComponent()
  {
    return t;
  }

  /** {@inheritDoc} */
  @Override
  public boolean equals(Object o)
  {
    boolean equal = false;
    if (o instanceof KryoJdkContainer) {
      KryoJdkContainer<?> k = (KryoJdkContainer<?>)o;
      equal = t.equals(k.getComponent());
    }
    return equal;
  }

  /** {@inheritDoc} */
  @Override
  public int hashCode()
  {
    int hash = 7;
    hash = 29 * hash + (this.t != null ? this.t.hashCode() : 0);
    return hash;
  }

}