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/*
* Copyright (C) 2013, 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 "suggest/policyimpl/dictionary/header/header_policy.h"
namespace latinime {
// Note that these are corresponding definitions in Java side in FormatSpec.FileHeader.
const char *const HeaderPolicy::MULTIPLE_WORDS_DEMOTION_RATE_KEY = "MULTIPLE_WORDS_DEMOTION_RATE";
// TODO: Change attribute string to "IS_DECAYING_DICT".
const char *const HeaderPolicy::IS_DECAYING_DICT_KEY = "USES_FORGETTING_CURVE";
const char *const HeaderPolicy::LAST_UPDATED_TIME_KEY = "date";
const char *const HeaderPolicy::LAST_DECAYED_TIME_KEY = "LAST_DECAYED_TIME";
const char *const HeaderPolicy::UNIGRAM_COUNT_KEY = "UNIGRAM_COUNT";
const char *const HeaderPolicy::BIGRAM_COUNT_KEY = "BIGRAM_COUNT";
const char *const HeaderPolicy::EXTENDED_REGION_SIZE_KEY = "EXTENDED_REGION_SIZE";
const int HeaderPolicy::DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE = 100;
const float HeaderPolicy::MULTIPLE_WORD_COST_MULTIPLIER_SCALE = 100.0f;
// Used for logging. Question mark is used to indicate that the key is not found.
void HeaderPolicy::readHeaderValueOrQuestionMark(const char *const key, int *outValue,
int outValueSize) const {
if (outValueSize <= 0) return;
if (outValueSize == 1) {
outValue[0] = '\0';
return;
}
std::vector<int> keyCodePointVector;
HeaderReadWriteUtils::insertCharactersIntoVector(key, &keyCodePointVector);
HeaderReadWriteUtils::AttributeMap::const_iterator it = mAttributeMap.find(keyCodePointVector);
if (it == mAttributeMap.end()) {
// The key was not found.
outValue[0] = '?';
outValue[1] = '\0';
return;
}
const int terminalIndex = min(static_cast<int>(it->second.size()), outValueSize - 1);
for (int i = 0; i < terminalIndex; ++i) {
outValue[i] = it->second[i];
}
outValue[terminalIndex] = '\0';
}
float HeaderPolicy::readMultipleWordCostMultiplier() const {
const int demotionRate = HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
MULTIPLE_WORDS_DEMOTION_RATE_KEY, DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE);
if (demotionRate <= 0) {
return static_cast<float>(MAX_VALUE_FOR_WEIGHTING);
}
return MULTIPLE_WORD_COST_MULTIPLIER_SCALE / static_cast<float>(demotionRate);
}
bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
const bool updatesLastUpdatedTime, const bool updatesLastDecayedTime,
const int unigramCount, const int bigramCount, const int extendedRegionSize) const {
int writingPos = 0;
if (!HeaderReadWriteUtils::writeDictionaryVersion(bufferToWrite, mDictFormatVersion,
&writingPos)) {
return false;
}
if (!HeaderReadWriteUtils::writeDictionaryFlags(bufferToWrite, mDictionaryFlags,
&writingPos)) {
return false;
}
// Temporarily writes a dummy header size.
int headerSizeFieldPos = writingPos;
if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(bufferToWrite, 0 /* size */,
&writingPos)) {
return false;
}
HeaderReadWriteUtils::AttributeMap attributeMapTowrite(mAttributeMap);
HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, UNIGRAM_COUNT_KEY, unigramCount);
HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, BIGRAM_COUNT_KEY, bigramCount);
HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, EXTENDED_REGION_SIZE_KEY,
extendedRegionSize);
if (updatesLastUpdatedTime) {
// Set current time as a last updated time.
HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_UPDATED_TIME_KEY,
time(0));
}
if (updatesLastDecayedTime) {
// Set current time as a last updated time.
HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_DECAYED_TIME_KEY,
time(0));
}
if (!HeaderReadWriteUtils::writeHeaderAttributes(bufferToWrite, &attributeMapTowrite,
&writingPos)) {
return false;
}
// Writes an actual header size.
if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(bufferToWrite, writingPos,
&headerSizeFieldPos)) {
return false;
}
return true;
}
/* static */ HeaderReadWriteUtils::AttributeMap
HeaderPolicy::createAttributeMapAndReadAllAttributes(const uint8_t *const dictBuf) {
HeaderReadWriteUtils::AttributeMap attributeMap;
HeaderReadWriteUtils::fetchAllHeaderAttributes(dictBuf, &attributeMap);
return attributeMap;
}
} // namespace latinime
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