/*******************************************************************************
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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.utils;
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import android.graphics.Bitmap;
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import com.nostra13.universalimageloader.cache.memory.MemoryCache;
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import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
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import com.nostra13.universalimageloader.core.assist.ImageSize;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.List;
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/**
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* Utility for generating of keys for memory cache, key comparing and other work with memory cache
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*
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* @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
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* @since 1.6.3
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*/
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public final class MemoryCacheUtils {
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private static final String URI_AND_SIZE_SEPARATOR = "_";
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private static final String WIDTH_AND_HEIGHT_SEPARATOR = "x";
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private MemoryCacheUtils() {
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}
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/**
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* Generates key for memory cache for incoming image (URI + size).<br />
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* Pattern for cache key - <b>[imageUri]_[width]x[height]</b>.
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*/
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public static String generateKey(String imageUri, ImageSize targetSize) {
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return new StringBuilder(imageUri).append(URI_AND_SIZE_SEPARATOR).append(targetSize.getWidth()).append(WIDTH_AND_HEIGHT_SEPARATOR).append(targetSize.getHeight()).toString();
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}
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public static Comparator<String> createFuzzyKeyComparator() {
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return new Comparator<String>() {
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@Override
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public int compare(String key1, String key2) {
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String imageUri1 = key1.substring(0, key1.lastIndexOf(URI_AND_SIZE_SEPARATOR));
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String imageUri2 = key2.substring(0, key2.lastIndexOf(URI_AND_SIZE_SEPARATOR));
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return imageUri1.compareTo(imageUri2);
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}
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};
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}
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/**
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* Searches all bitmaps in memory cache which are corresponded to incoming URI.<br />
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* <b>Note:</b> Memory cache can contain multiple sizes of the same image if only you didn't set
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* {@link ImageLoaderConfiguration.Builder#denyCacheImageMultipleSizesInMemory()
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* denyCacheImageMultipleSizesInMemory()} option in {@linkplain ImageLoaderConfiguration configuration}
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*/
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public static List<Bitmap> findCachedBitmapsForImageUri(String imageUri, MemoryCache memoryCache) {
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List<Bitmap> values = new ArrayList<Bitmap>();
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for (String key : memoryCache.keys()) {
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if (key.startsWith(imageUri)) {
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values.add(memoryCache.get(key));
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}
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}
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return values;
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}
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/**
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* Searches all keys in memory cache which are corresponded to incoming URI.<br />
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* <b>Note:</b> Memory cache can contain multiple sizes of the same image if only you didn't set
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* {@link ImageLoaderConfiguration.Builder#denyCacheImageMultipleSizesInMemory()
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* denyCacheImageMultipleSizesInMemory()} option in {@linkplain ImageLoaderConfiguration configuration}
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*/
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public static List<String> findCacheKeysForImageUri(String imageUri, MemoryCache memoryCache) {
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List<String> values = new ArrayList<String>();
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for (String key : memoryCache.keys()) {
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if (key.startsWith(imageUri)) {
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values.add(key);
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}
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}
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return values;
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}
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/**
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* Removes from memory cache all images for incoming URI.<br />
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* <b>Note:</b> Memory cache can contain multiple sizes of the same image if only you didn't set
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* {@link ImageLoaderConfiguration.Builder#denyCacheImageMultipleSizesInMemory()
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* denyCacheImageMultipleSizesInMemory()} option in {@linkplain ImageLoaderConfiguration configuration}
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*/
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public static void removeFromCache(String imageUri, MemoryCache memoryCache) {
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List<String> keysToRemove = new ArrayList<String>();
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for (String key : memoryCache.keys()) {
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if (key.startsWith(imageUri)) {
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keysToRemove.add(key);
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}
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}
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for (String keyToRemove : keysToRemove) {
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memoryCache.remove(keyToRemove);
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}
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}
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}
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