Android Open Source - AUIL-for-volley Base Memory Cache

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The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 */*from w  w  w  .  j  a v  a2  s.  c o m*/
 * 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 com.nostra13.universalimageloader.cache.memory;

import java.lang.ref.Reference;
import java.util.*;

/**
 * Base memory cache. Implements common functionality for memory cache. Provides object references (
 * {@linkplain Reference not strong}) storing.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.0.0
 */
public abstract class BaseMemoryCache<K, V> implements MemoryCacheAware<K, V> {

  /** Stores not strong references to objects */
  private final Map<K, Reference<V>> softMap = Collections.synchronizedMap(new HashMap<K, Reference<V>>());

  @Override
  public V get(K key) {
    V result = null;
    Reference<V> reference = softMap.get(key);
    if (reference != null) {
      result = reference.get();
    }
    return result;
  }

  @Override
  public boolean put(K key, V value) {
    softMap.put(key, createReference(value));
    return true;
  }

  @Override
  public void remove(K key) {
    softMap.remove(key);
  }

  @Override
  public Collection<K> keys() {
    synchronized (softMap) {
      return new HashSet<K>(softMap.keySet());
    }
  }

  @Override
  public void clear() {
    softMap.clear();
  }

  /** Creates {@linkplain Reference not strong} reference of value */
  protected abstract Reference<V> createReference(V value);
}

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