/**
 * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution. 3. Neither the name of SCM-Manager;
 * nor the names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */



package sonia.scm.cache;

//~--- non-JDK imports --------------------------------------------------------

import com.google.common.collect.Maps;

import sonia.scm.Filter;

//~--- JDK imports ------------------------------------------------------------

import java.util.Map;

/**
 *
 * @author Sebastian Sdorra
 * @since 1.17
 *
 * @param <K>
 * @param <V>
 */
public class MapCache<K, V> implements Cache<K, V>
{

  /**
   * Method description
   *
   */
  @Override
  public void clear()
  {
    map.clear();
  }

  /**
   * Method description
   *
   *
   * @param key
   *
   * @return
   */
  @Override
  public boolean contains(K key)
  {
    return map.containsKey(key);
  }

  /**
   * Method description
   *
   *
   * @param key
   * @param value
   */
  @Override
  public void put(K key, V value)
  {
    map.put(key, value);
  }

  /**
   * Method description
   *
   *
   * @param key
   *
   * @return
   */
  @Override
  public boolean remove(K key)
  {
    return map.remove(key) != null;
  }

  /**
   * Method description
   *
   *
   * @param filter
   *
   * @return
   */
  @Override
  public boolean removeAll(Filter<K> filter)
  {
    boolean result = false;

    for (K key : map.keySet())
    {
      if (filter.accept(key))
      {
        if (remove(key))
        {
          result = true;
        }
      }
    }

    return result;
  }

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param key
   *
   * @return
   */
  @Override
  public V get(K key)
  {
    return map.get(key);
  }

  //~--- fields ---------------------------------------------------------------

  /** Field description */
  private Map<K, V> map = Maps.newHashMap();
}