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/***************************************************************************
 * Copyright (c) 2004 - 2007 Eike Stepper, Germany.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *    Eike Stepper - initial API and implementation
 **************************************************************************/
package org.eclipse.net4j.util.ref;

import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.text.MessageFormat;

/**
 * @author Eike Stepper
 */
public class KeyedSoftReference<K, T> extends SoftReference<T> implements KeyedReference<K, T>
{
  private K key;

  public KeyedSoftReference(K key, T ref)
  {
    super(ref);
    this.key = key;
  }

  public KeyedSoftReference(K key, T ref, ReferenceQueue<T> queue)
  {
    super(ref, queue);
    this.key = key;
  }

  public ReferenceType getType()
  {
    return ReferenceType.SOFT;
  }

  public K getKey()
  {
    return key;
  }

  @Override
  public String toString()
  {
    return MessageFormat.format("KeyedSoftReference[{0} -> {1}]", key, isEnqueued() ? "ENQUEUED" : get());
  }
}

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