73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
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/*
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* Copyright (C) 2013 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_TINYHASHMAP_H
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#define ANDROID_HWUI_TINYHASHMAP_H
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#include <utils/BasicHashtable.h>
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namespace android {
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namespace uirenderer {
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/**
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* A very simple hash map that doesn't allow duplicate keys, overwriting the older entry.
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*
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* Currently, expects simple keys that are handled by hash_t()
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*/
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template <typename TKey, typename TValue>
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class TinyHashMap {
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public:
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typedef key_value_pair_t<TKey, TValue> TEntry;
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/**
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* Puts an entry in the hash, removing any existing entry with the same key
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*/
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void put(TKey key, TValue value) {
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hash_t hash = hash_t(key);
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ssize_t index = mTable.find(-1, hash, key);
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if (index != -1) {
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mTable.removeAt(index);
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}
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TEntry initEntry(key, value);
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mTable.add(hash, initEntry);
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}
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/**
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* Return true if key is in the map, in which case stores the value in the output ref
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*/
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bool get(TKey key, TValue& outValue) {
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hash_t hash = hash_t(key);
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ssize_t index = mTable.find(-1, hash, key);
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if (index == -1) {
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return false;
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}
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outValue = mTable.entryAt(index).value;
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return true;
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}
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void clear() { mTable.clear(); }
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private:
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BasicHashtable<TKey, TEntry> mTable;
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};
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_TINYHASHMAP_H
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