/*******************************************************************************
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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.Collections;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Decorator for {@link MemoryCache}. Provides special feature for cache: if some cached object age exceeds defined
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* value then this object will be removed from cache.
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*
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* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
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* @see MemoryCache
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* @since 1.3.1
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*/
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public class LimitedAgeMemoryCache implements MemoryCache {
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private final MemoryCache cache;
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private final long maxAge;
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private final Map<String, Long> loadingDates = Collections.synchronizedMap(new HashMap<String, Long>());
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/**
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* @param cache Wrapped memory cache
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* @param maxAge Max object age <b>(in seconds)</b>. If object age will exceed this value then it'll be removed from
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* cache on next treatment (and therefore be reloaded).
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*/
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public LimitedAgeMemoryCache(MemoryCache cache, long maxAge) {
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this.cache = cache;
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this.maxAge = maxAge * 1000; // to milliseconds
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}
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@Override
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public boolean put(String key, Bitmap value) {
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boolean putSuccesfully = cache.put(key, value);
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if (putSuccesfully) {
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loadingDates.put(key, System.currentTimeMillis());
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}
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return putSuccesfully;
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}
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@Override
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public Bitmap get(String key) {
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Long loadingDate = loadingDates.get(key);
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if (loadingDate != null && System.currentTimeMillis() - loadingDate > maxAge) {
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cache.remove(key);
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loadingDates.remove(key);
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}
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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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loadingDates.remove(key);
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return cache.remove(key);
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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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@Override
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public void clear() {
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cache.clear();
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loadingDates.clear();
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}
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}
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