The Tor Browser / file comparison
comparison: mobile/android/thirdparty/com/squareup/picasso/LruCache.java
mobile/android/thirdparty/com/squareup/picasso/LruCache.java
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
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| -1:000000000000 | 0:8213380a452a |
|---|---|
| 1 /* | |
| 2 * Copyright (C) 2011 The Android Open Source Project | |
| 3 * | |
| 4 * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 * you may not use this file except in compliance with the License. | |
| 6 * You may obtain a copy of the License at | |
| 7 * | |
| 8 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 * | |
| 10 * Unless required by applicable law or agreed to in writing, software | |
| 11 * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 * See the License for the specific language governing permissions and | |
| 14 * limitations under the License. | |
| 15 */ | |
| 16 package com.squareup.picasso; | |
| 17 | |
| 18 import android.content.Context; | |
| 19 import android.graphics.Bitmap; | |
| 20 import java.util.LinkedHashMap; | |
| 21 import java.util.Map; | |
| 22 | |
| 23 /** A memory cache which uses a least-recently used eviction policy. */ | |
| 24 public class LruCache implements Cache { | |
| 25 final LinkedHashMap<String, Bitmap> map; | |
| 26 private final int maxSize; | |
| 27 | |
| 28 private int size; | |
| 29 private int putCount; | |
| 30 private int evictionCount; | |
| 31 private int hitCount; | |
| 32 private int missCount; | |
| 33 | |
| 34 /** Create a cache using an appropriate portion of the available RAM as the maximum size. */ | |
| 35 public LruCache(Context context) { | |
| 36 this(Utils.calculateMemoryCacheSize(context)); | |
| 37 } | |
| 38 | |
| 39 /** Create a cache with a given maximum size in bytes. */ | |
| 40 public LruCache(int maxSize) { | |
| 41 if (maxSize <= 0) { | |
| 42 throw new IllegalArgumentException("Max size must be positive."); | |
| 43 } | |
| 44 this.maxSize = maxSize; | |
| 45 this.map = new LinkedHashMap<String, Bitmap>(0, 0.75f, true); | |
| 46 } | |
| 47 | |
| 48 @Override public Bitmap get(String key) { | |
| 49 if (key == null) { | |
| 50 throw new NullPointerException("key == null"); | |
| 51 } | |
| 52 | |
| 53 Bitmap mapValue; | |
| 54 synchronized (this) { | |
| 55 mapValue = map.get(key); | |
| 56 if (mapValue != null) { | |
| 57 hitCount++; | |
| 58 return mapValue; | |
| 59 } | |
| 60 missCount++; | |
| 61 } | |
| 62 | |
| 63 return null; | |
| 64 } | |
| 65 | |
| 66 @Override public void set(String key, Bitmap bitmap) { | |
| 67 if (key == null || bitmap == null) { | |
| 68 throw new NullPointerException("key == null || bitmap == null"); | |
| 69 } | |
| 70 | |
| 71 Bitmap previous; | |
| 72 synchronized (this) { | |
| 73 putCount++; | |
| 74 size += Utils.getBitmapBytes(bitmap); | |
| 75 previous = map.put(key, bitmap); | |
| 76 if (previous != null) { | |
| 77 size -= Utils.getBitmapBytes(previous); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 trimToSize(maxSize); | |
| 82 } | |
| 83 | |
| 84 private void trimToSize(int maxSize) { | |
| 85 while (true) { | |
| 86 String key; | |
| 87 Bitmap value; | |
| 88 synchronized (this) { | |
| 89 if (size < 0 || (map.isEmpty() && size != 0)) { | |
| 90 throw new IllegalStateException( | |
| 91 getClass().getName() + ".sizeOf() is reporting inconsistent results!"); | |
| 92 } | |
| 93 | |
| 94 if (size <= maxSize || map.isEmpty()) { | |
| 95 break; | |
| 96 } | |
| 97 | |
| 98 Map.Entry<String, Bitmap> toEvict = map.entrySet().iterator().next(); | |
| 99 key = toEvict.getKey(); | |
| 100 value = toEvict.getValue(); | |
| 101 map.remove(key); | |
| 102 size -= Utils.getBitmapBytes(value); | |
| 103 evictionCount++; | |
| 104 } | |
| 105 } | |
| 106 } | |
| 107 | |
| 108 /** Clear the cache. */ | |
| 109 public final void evictAll() { | |
| 110 trimToSize(-1); // -1 will evict 0-sized elements | |
| 111 } | |
| 112 | |
| 113 /** Returns the sum of the sizes of the entries in this cache. */ | |
| 114 public final synchronized int size() { | |
| 115 return size; | |
| 116 } | |
| 117 | |
| 118 /** Returns the maximum sum of the sizes of the entries in this cache. */ | |
| 119 public final synchronized int maxSize() { | |
| 120 return maxSize; | |
| 121 } | |
| 122 | |
| 123 public final synchronized void clear() { | |
| 124 evictAll(); | |
| 125 } | |
| 126 | |
| 127 /** Returns the number of times {@link #get} returned a value. */ | |
| 128 public final synchronized int hitCount() { | |
| 129 return hitCount; | |
| 130 } | |
| 131 | |
| 132 /** Returns the number of times {@link #get} returned {@code null}. */ | |
| 133 public final synchronized int missCount() { | |
| 134 return missCount; | |
| 135 } | |
| 136 | |
| 137 /** Returns the number of times {@link #set(String, Bitmap)} was called. */ | |
| 138 public final synchronized int putCount() { | |
| 139 return putCount; | |
| 140 } | |
| 141 | |
| 142 /** Returns the number of values that have been evicted. */ | |
| 143 public final synchronized int evictionCount() { | |
| 144 return evictionCount; | |
| 145 } | |
| 146 } |
