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