Merge "This file should not be here."
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Romain Guy
Android (Google) Code Review
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/*
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* Copyright (C) 2010 The Android Open Source Project
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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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#ifndef ANDROID_HWUI_GENERATION_CACHE_H
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#define ANDROID_HWUI_GENERATION_CACHE_H
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#include <utils/KeyedVector.h>
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#include <utils/RefBase.h>
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namespace android {
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namespace uirenderer {
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template<typename EntryKey, typename EntryValue>
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class OnEntryRemoved {
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public:
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virtual ~OnEntryRemoved() { };
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virtual void operator()(EntryKey& key, EntryValue& value) = 0;
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}; // class OnEntryRemoved
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template<typename EntryKey, typename EntryValue>
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struct Entry: public LightRefBase<Entry<EntryKey, EntryValue> > {
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Entry() { }
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Entry(const Entry<EntryKey, EntryValue>& e):
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key(e.key), value(e.value), parent(e.parent), child(e.child) { }
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Entry(sp<Entry<EntryKey, EntryValue> > e):
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key(e->key), value(e->value), parent(e->parent), child(e->child) { }
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EntryKey key;
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EntryValue value;
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sp<Entry<EntryKey, EntryValue> > parent;
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sp<Entry<EntryKey, EntryValue> > child;
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}; // struct Entry
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template<typename K, typename V>
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class GenerationCache {
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public:
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GenerationCache(uint32_t maxCapacity);
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virtual ~GenerationCache();
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enum Capacity {
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kUnlimitedCapacity,
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};
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void setOnEntryRemovedListener(OnEntryRemoved<K, V>* listener);
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void clear();
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bool contains(K key) const;
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V get(K key);
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K getKeyAt(uint32_t index) const;
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bool put(K key, V value);
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V remove(K key);
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V removeOldest();
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V getValueAt(uint32_t index) const;
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uint32_t size() const;
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void addToCache(sp<Entry<K, V> > entry, K key, V value);
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void attachToCache(sp<Entry<K, V> > entry);
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void detachFromCache(sp<Entry<K, V> > entry);
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V removeAt(ssize_t index);
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KeyedVector<K, sp<Entry<K, V> > > mCache;
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uint32_t mMaxCapacity;
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OnEntryRemoved<K, V>* mListener;
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sp<Entry<K, V> > mOldest;
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sp<Entry<K, V> > mYoungest;
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}; // class GenerationCache
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template<typename K, typename V>
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GenerationCache<K, V>::GenerationCache(uint32_t maxCapacity): mMaxCapacity(maxCapacity), mListener(NULL) {
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};
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template<typename K, typename V>
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GenerationCache<K, V>::~GenerationCache() {
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clear();
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};
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template<typename K, typename V>
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uint32_t GenerationCache<K, V>::size() const {
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return mCache.size();
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}
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template<typename K, typename V>
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void GenerationCache<K, V>::setOnEntryRemovedListener(OnEntryRemoved<K, V>* listener) {
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mListener = listener;
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}
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template<typename K, typename V>
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void GenerationCache<K, V>::clear() {
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if (mListener) {
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for (uint32_t i = 0; i < mCache.size(); i++) {
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sp<Entry<K, V> > entry = mCache.valueAt(i);
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if (mListener) {
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(*mListener)(entry->key, entry->value);
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}
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}
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}
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mCache.clear();
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mYoungest.clear();
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mOldest.clear();
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}
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template<typename K, typename V>
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bool GenerationCache<K, V>::contains(K key) const {
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return mCache.indexOfKey(key) >= 0;
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}
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template<typename K, typename V>
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K GenerationCache<K, V>::getKeyAt(uint32_t index) const {
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return mCache.keyAt(index);
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}
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template<typename K, typename V>
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V GenerationCache<K, V>::getValueAt(uint32_t index) const {
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return mCache.valueAt(index)->value;
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}
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template<typename K, typename V>
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V GenerationCache<K, V>::get(K key) {
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ssize_t index = mCache.indexOfKey(key);
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if (index >= 0) {
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sp<Entry<K, V> > entry = mCache.valueAt(index);
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if (entry.get()) {
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detachFromCache(entry);
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attachToCache(entry);
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return entry->value;
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}
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}
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return NULL;
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}
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template<typename K, typename V>
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bool GenerationCache<K, V>::put(K key, V value) {
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if (mMaxCapacity != kUnlimitedCapacity && mCache.size() >= mMaxCapacity) {
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removeOldest();
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}
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ssize_t index = mCache.indexOfKey(key);
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if (index < 0) {
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sp<Entry<K, V> > entry = new Entry<K, V>;
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addToCache(entry, key, value);
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return true;
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}
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return false;
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}
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template<typename K, typename V>
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void GenerationCache<K, V>::addToCache(sp<Entry<K, V> > entry, K key, V value) {
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entry->key = key;
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entry->value = value;
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mCache.add(key, entry);
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attachToCache(entry);
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}
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template<typename K, typename V>
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V GenerationCache<K, V>::remove(K key) {
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ssize_t index = mCache.indexOfKey(key);
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if (index >= 0) {
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return removeAt(index);
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}
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return NULL;
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}
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template<typename K, typename V>
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V GenerationCache<K, V>::removeAt(ssize_t index) {
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sp<Entry<K, V> > entry = mCache.valueAt(index);
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if (mListener) {
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(*mListener)(entry->key, entry->value);
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}
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mCache.removeItemsAt(index, 1);
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detachFromCache(entry);
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return entry->value;
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}
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template<typename K, typename V>
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V GenerationCache<K, V>::removeOldest() {
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if (mOldest.get()) {
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ssize_t index = mCache.indexOfKey(mOldest->key);
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if (index >= 0) {
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return removeAt(index);
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}
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}
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return NULL;
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}
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template<typename K, typename V>
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void GenerationCache<K, V>::attachToCache(sp<Entry<K, V> > entry) {
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if (!mYoungest.get()) {
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mYoungest = mOldest = entry;
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} else {
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entry->parent = mYoungest;
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mYoungest->child = entry;
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mYoungest = entry;
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}
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}
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template<typename K, typename V>
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void GenerationCache<K, V>::detachFromCache(sp<Entry<K, V> > entry) {
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if (entry->parent.get()) {
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entry->parent->child = entry->child;
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}
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if (entry->child.get()) {
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entry->child->parent = entry->parent;
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}
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if (mOldest == entry) {
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mOldest = entry->child;
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}
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if (mYoungest == entry) {
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mYoungest = entry->parent;
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}
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entry->parent.clear();
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entry->child.clear();
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}
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_GENERATION_CACHE_H
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