diff options
Diffstat (limited to 'src/com/android/gallery3d/util/IdentityCache.java')
-rw-r--r-- | src/com/android/gallery3d/util/IdentityCache.java | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/src/com/android/gallery3d/util/IdentityCache.java b/src/com/android/gallery3d/util/IdentityCache.java deleted file mode 100644 index 3edc424a3..000000000 --- a/src/com/android/gallery3d/util/IdentityCache.java +++ /dev/null @@ -1,78 +0,0 @@ -/* - * Copyright (C) 2010 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package com.android.gallery3d.util; - -import java.lang.ref.ReferenceQueue; -import java.lang.ref.WeakReference; -import java.util.ArrayList; -import java.util.HashMap; -import java.util.Set; - -public class IdentityCache<K, V> { - - private final HashMap<K, Entry<K, V>> mWeakMap = - new HashMap<K, Entry<K, V>>(); - private ReferenceQueue<V> mQueue = new ReferenceQueue<V>(); - - public IdentityCache() { - } - - private static class Entry<K, V> extends WeakReference<V> { - K mKey; - - public Entry(K key, V value, ReferenceQueue<V> queue) { - super(value, queue); - mKey = key; - } - } - - private void cleanUpWeakMap() { - Entry<K, V> entry = (Entry<K, V>) mQueue.poll(); - while (entry != null) { - mWeakMap.remove(entry.mKey); - entry = (Entry<K, V>) mQueue.poll(); - } - } - - public synchronized V put(K key, V value) { - cleanUpWeakMap(); - Entry<K, V> entry = mWeakMap.put( - key, new Entry<K, V>(key, value, mQueue)); - return entry == null ? null : entry.get(); - } - - public synchronized V get(K key) { - cleanUpWeakMap(); - Entry<K, V> entry = mWeakMap.get(key); - return entry == null ? null : entry.get(); - } - - // This is currently unused. - /* - public synchronized void clear() { - mWeakMap.clear(); - mQueue = new ReferenceQueue<V>(); - } - */ - - // This is for debugging only - public synchronized ArrayList<K> keys() { - Set<K> set = mWeakMap.keySet(); - ArrayList<K> result = new ArrayList<K>(set); - return result; - } -} |