/*******************************************************************************
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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.LimitedMemoryCache;
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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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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import java.util.Map.Entry;
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import java.util.Set;
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/**
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* Limited {@link Bitmap bitmap} cache. Provides {@link Bitmap bitmaps} storing. Size of all stored bitmaps will not to
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* exceed size limit. When cache reaches limit size then the bitmap which has the largest size is deleted from
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* cache.<br />
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* <br />
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* <b>NOTE:</b> This cache uses strong and weak references for stored Bitmaps. Strong references - for limited count of
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* Bitmaps (depends on cache size), weak references - for all other cached Bitmaps.
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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 LargestLimitedMemoryCache extends LimitedMemoryCache {
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/**
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* Contains strong references to stored objects (keys) and sizes of the objects. If hard cache
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* size will exceed limit then object with the largest size is deleted (but it continue exist at
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* {@link #softMap} and can be collected by GC at any time)
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*/
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private final Map<Bitmap, Integer> valueSizes = Collections.synchronizedMap(new HashMap<Bitmap, Integer>());
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public LargestLimitedMemoryCache(int sizeLimit) {
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super(sizeLimit);
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}
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@Override
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public boolean put(String key, Bitmap value) {
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if (super.put(key, value)) {
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valueSizes.put(value, getSize(value));
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return true;
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} else {
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return false;
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}
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}
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@Override
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public Bitmap remove(String key) {
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Bitmap value = super.get(key);
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if (value != null) {
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valueSizes.remove(value);
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}
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return super.remove(key);
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}
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@Override
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public void clear() {
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valueSizes.clear();
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super.clear();
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}
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@Override
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protected int getSize(Bitmap value) {
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return value.getRowBytes() * value.getHeight();
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}
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@Override
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protected Bitmap removeNext() {
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Integer maxSize = null;
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Bitmap largestValue = null;
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Set<Entry<Bitmap, Integer>> entries = valueSizes.entrySet();
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synchronized (valueSizes) {
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for (Entry<Bitmap, Integer> entry : entries) {
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if (largestValue == null) {
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largestValue = entry.getKey();
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maxSize = entry.getValue();
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} else {
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Integer size = entry.getValue();
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if (size > maxSize) {
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maxSize = size;
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largestValue = entry.getKey();
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}
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}
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}
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}
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valueSizes.remove(largestValue);
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return largestValue;
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}
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@Override
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protected Reference<Bitmap> createReference(Bitmap value) {
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return new WeakReference<Bitmap>(value);
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}
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}
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