Android Open Source - HorizontalImageScroller-Modified Memory Cache

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Back to project page HorizontalImageScroller-Modified.

License

The source code is released under:

Apache License

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Java Source Code

/*
Copyright 2012 Two Toasters, LLC//from w w w  .j  a  v  a2 s .c om

   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.twotoasters.android.horizontalimagescroller.io;

import java.lang.ref.SoftReference;
import java.util.concurrent.ConcurrentHashMap;

import android.graphics.Bitmap;

public class MemoryCache {
  private ConcurrentHashMap<ImageUrlRequestCacheKey, SoftReference<Bitmap>> cache = new ConcurrentHashMap<ImageUrlRequestCacheKey, SoftReference<Bitmap>>();

  public boolean contains(ImageUrlRequestCacheKey key) {
    try {
      return get(key) != null;
    } catch (NullPointerException e) {
      return false;
    }
  }

  public Bitmap get(ImageUrlRequestCacheKey key) {
    try {
      if(!cache.containsKey(key))
        return null;
      SoftReference<Bitmap> ref = cache.get(key);
      return ref.get();
    } catch (NullPointerException e) {
      return null;
    }
  }

  public void put(ImageUrlRequestCacheKey key, Bitmap bitmap) {
    try {
      cache.put(key, new SoftReference<Bitmap>(bitmap));
    } catch (NullPointerException e) {
    }
  }

  public void clear() {
    cache.clear();
  }

  public void putIfAbsent(ImageUrlRequestCacheKey key, Bitmap bitmap) {
    try {
      if(!contains(key)) {
        put(key, bitmap);
      }
    } catch (Exception e) {
    }
  }
}

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