/*******************************************************************************
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* Copyright 2011-2014 Sergey Tarasevich
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*******************************************************************************/
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package com.nostra13.universalimageloader.cache.memory.impl;
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import android.graphics.Bitmap;
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import com.nostra13.universalimageloader.cache.memory.MemoryCache;
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import java.util.Collection;
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import java.util.Comparator;
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/**
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* Decorator for {@link MemoryCache}. Provides special feature for cache: some different keys are considered as
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* equals (using {@link Comparator comparator}). And when you try to put some value into cache by key so entries with
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* "equals" keys will be removed from cache before.<br />
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* <b>NOTE:</b> Used for internal needs. Normally you don't need to use this class.
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*
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* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
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* @since 1.0.0
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*/
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public class FuzzyKeyMemoryCache implements MemoryCache {
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private final MemoryCache cache;
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private final Comparator<String> keyComparator;
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public FuzzyKeyMemoryCache(MemoryCache cache, Comparator<String> keyComparator) {
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this.cache = cache;
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this.keyComparator = keyComparator;
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}
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@Override
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public boolean put(String key, Bitmap value) {
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// Search equal key and remove this entry
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synchronized (cache) {
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String keyToRemove = null;
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for (String cacheKey : cache.keys()) {
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if (keyComparator.compare(key, cacheKey) == 0) {
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keyToRemove = cacheKey;
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break;
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}
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}
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if (keyToRemove != null) {
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cache.remove(keyToRemove);
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}
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}
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return cache.put(key, value);
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}
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@Override
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public Bitmap get(String key) {
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return cache.get(key);
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}
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@Override
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public Bitmap remove(String key) {
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return cache.remove(key);
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}
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@Override
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public void clear() {
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cache.clear();
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}
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@Override
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public Collection<String> keys() {
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return cache.keys();
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}
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}
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