diff options
Diffstat (limited to 'WallpaperPicker/src/android/util/Pools.java')
-rw-r--r-- | WallpaperPicker/src/android/util/Pools.java | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/WallpaperPicker/src/android/util/Pools.java b/WallpaperPicker/src/android/util/Pools.java deleted file mode 100644 index 40bab1eae..000000000 --- a/WallpaperPicker/src/android/util/Pools.java +++ /dev/null @@ -1,165 +0,0 @@ -/* - * Copyright (C) 2009 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 android.util; - -/** - * Helper class for crating pools of objects. An example use looks like this: - * <pre> - * public class MyPooledClass { - * - * private static final SynchronizedPool<MyPooledClass> sPool = - * new SynchronizedPool<MyPooledClass>(10); - * - * public static MyPooledClass obtain() { - * MyPooledClass instance = sPool.acquire(); - * return (instance != null) ? instance : new MyPooledClass(); - * } - * - * public void recycle() { - * // Clear state if needed. - * sPool.release(this); - * } - * - * . . . - * } - * </pre> - * - * @hide - */ -public final class Pools { - - /** - * Interface for managing a pool of objects. - * - * @param <T> The pooled type. - */ - public static interface Pool<T> { - - /** - * @return An instance from the pool if such, null otherwise. - */ - public T acquire(); - - /** - * Release an instance to the pool. - * - * @param instance The instance to release. - * @return Whether the instance was put in the pool. - * - * @throws IllegalStateException If the instance is already in the pool. - */ - public boolean release(T instance); - } - - private Pools() { - /* do nothing - hiding constructor */ - } - - /** - * Simple (non-synchronized) pool of objects. - * - * @param <T> The pooled type. - */ - public static class SimplePool<T> implements Pool<T> { - private final Object[] mPool; - - private int mPoolSize; - - /** - * Creates a new instance. - * - * @param maxPoolSize The max pool size. - * - * @throws IllegalArgumentException If the max pool size is less than zero. - */ - public SimplePool(int maxPoolSize) { - if (maxPoolSize <= 0) { - throw new IllegalArgumentException("The max pool size must be > 0"); - } - mPool = new Object[maxPoolSize]; - } - - @Override - @SuppressWarnings("unchecked") - public T acquire() { - if (mPoolSize > 0) { - final int lastPooledIndex = mPoolSize - 1; - T instance = (T) mPool[lastPooledIndex]; - mPool[lastPooledIndex] = null; - mPoolSize--; - return instance; - } - return null; - } - - @Override - public boolean release(T instance) { - if (isInPool(instance)) { - throw new IllegalStateException("Already in the pool!"); - } - if (mPoolSize < mPool.length) { - mPool[mPoolSize] = instance; - mPoolSize++; - return true; - } - return false; - } - - private boolean isInPool(T instance) { - for (int i = 0; i < mPoolSize; i++) { - if (mPool[i] == instance) { - return true; - } - } - return false; - } - } - - /** - * Synchronized) pool of objects. - * - * @param <T> The pooled type. - */ - public static class SynchronizedPool<T> extends SimplePool<T> { - private final Object mLock = new Object(); - - /** - * Creates a new instance. - * - * @param maxPoolSize The max pool size. - * - * @throws IllegalArgumentException If the max pool size is less than zero. - */ - public SynchronizedPool(int maxPoolSize) { - super(maxPoolSize); - } - - @Override - public T acquire() { - synchronized (mLock) { - return super.acquire(); - } - } - - @Override - public boolean release(T element) { - synchronized (mLock) { - return super.release(element); - } - } - } -}
\ No newline at end of file |