68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
/*
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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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#include <sys/types.h>
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#include "AAtomizer.h"
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namespace android {
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// static
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AAtomizer AAtomizer::gAtomizer;
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// static
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const char *AAtomizer::Atomize(const char *name) {
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return gAtomizer.atomize(name);
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}
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AAtomizer::AAtomizer() {
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for (size_t i = 0; i < 128; ++i) {
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mAtoms.push(List<AString>());
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}
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}
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const char *AAtomizer::atomize(const char *name) {
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Mutex::Autolock autoLock(mLock);
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const size_t n = mAtoms.size();
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size_t index = AAtomizer::Hash(name) % n;
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List<AString> &entry = mAtoms.editItemAt(index);
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List<AString>::iterator it = entry.begin();
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while (it != entry.end()) {
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if ((*it) == name) {
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return (*it).c_str();
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}
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++it;
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}
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entry.push_back(AString(name));
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return (*--entry.end()).c_str();
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}
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// static
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uint32_t AAtomizer::Hash(const char *s) {
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uint32_t sum = 0;
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while (*s != '\0') {
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sum = (sum * 31) + *s;
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++s;
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}
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return sum;
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}
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} // namespace android
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