2013-06-11 03:01:49 +00:00
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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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2013-08-13 11:35:16 +00:00
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#include "suggest/policyimpl/dictionary/header/header_policy.h"
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2013-06-11 03:01:49 +00:00
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namespace latinime {
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2013-09-26 03:59:02 +00:00
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// Note that these are corresponding definitions in Java side in FormatSpec.FileHeader.
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2013-09-04 10:00:53 +00:00
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const char *const HeaderPolicy::MULTIPLE_WORDS_DEMOTION_RATE_KEY = "MULTIPLE_WORDS_DEMOTION_RATE";
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2013-09-30 04:57:54 +00:00
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// TODO: Change attribute string to "IS_DECAYING_DICT".
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const char *const HeaderPolicy::IS_DECAYING_DICT_KEY = "USES_FORGETTING_CURVE";
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2013-09-05 03:28:38 +00:00
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const char *const HeaderPolicy::LAST_UPDATED_TIME_KEY = "date";
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2013-09-27 14:12:12 +00:00
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const char *const HeaderPolicy::UNIGRAM_COUNT_KEY = "UNIGRAM_COUNT";
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const char *const HeaderPolicy::BIGRAM_COUNT_KEY = "BIGRAM_COUNT";
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const char *const HeaderPolicy::EXTENDED_REGION_SIZE_KEY = "EXTENDED_REGION_SIZE";
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2013-09-26 01:45:03 +00:00
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const int HeaderPolicy::DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE = 100;
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2013-09-04 10:00:53 +00:00
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const float HeaderPolicy::MULTIPLE_WORD_COST_MULTIPLIER_SCALE = 100.0f;
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// Used for logging. Question mark is used to indicate that the key is not found.
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void HeaderPolicy::readHeaderValueOrQuestionMark(const char *const key, int *outValue,
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int outValueSize) const {
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if (outValueSize <= 0) return;
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if (outValueSize == 1) {
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outValue[0] = '\0';
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return;
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}
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std::vector<int> keyCodePointVector;
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2013-09-26 01:45:03 +00:00
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HeaderReadWriteUtils::insertCharactersIntoVector(key, &keyCodePointVector);
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2013-09-18 09:08:33 +00:00
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HeaderReadWriteUtils::AttributeMap::const_iterator it = mAttributeMap.find(keyCodePointVector);
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2013-09-04 10:00:53 +00:00
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if (it == mAttributeMap.end()) {
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// The key was not found.
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outValue[0] = '?';
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outValue[1] = '\0';
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return;
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}
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const int terminalIndex = min(static_cast<int>(it->second.size()), outValueSize - 1);
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for (int i = 0; i < terminalIndex; ++i) {
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outValue[i] = it->second[i];
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}
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outValue[terminalIndex] = '\0';
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}
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2013-06-11 03:01:49 +00:00
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2013-09-04 10:00:53 +00:00
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float HeaderPolicy::readMultipleWordCostMultiplier() const {
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2013-09-26 01:45:03 +00:00
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const int demotionRate = HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
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2013-09-27 14:12:12 +00:00
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MULTIPLE_WORDS_DEMOTION_RATE_KEY, DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE);
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2013-09-26 01:45:03 +00:00
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if (demotionRate <= 0) {
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return static_cast<float>(MAX_VALUE_FOR_WEIGHTING);
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2013-09-04 10:00:53 +00:00
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}
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2013-09-26 01:45:03 +00:00
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return MULTIPLE_WORD_COST_MULTIPLIER_SCALE / static_cast<float>(demotionRate);
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2013-09-05 03:28:38 +00:00
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}
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2013-09-18 09:08:33 +00:00
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bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
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2013-09-27 14:12:12 +00:00
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const bool updatesLastUpdatedTime, const int unigramCount, const int bigramCount,
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const int extendedRegionSize) const {
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2013-09-18 09:08:33 +00:00
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int writingPos = 0;
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if (!HeaderReadWriteUtils::writeDictionaryVersion(bufferToWrite, mDictFormatVersion,
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&writingPos)) {
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return false;
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}
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if (!HeaderReadWriteUtils::writeDictionaryFlags(bufferToWrite, mDictionaryFlags,
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&writingPos)) {
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return false;
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}
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// Temporarily writes a dummy header size.
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int headerSizeFieldPos = writingPos;
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if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(bufferToWrite, 0 /* size */,
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&writingPos)) {
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return false;
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}
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2013-09-27 14:12:12 +00:00
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HeaderReadWriteUtils::AttributeMap attributeMapTowrite(mAttributeMap);
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HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, UNIGRAM_COUNT_KEY, unigramCount);
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HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, BIGRAM_COUNT_KEY, bigramCount);
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HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, EXTENDED_REGION_SIZE_KEY,
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extendedRegionSize);
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2013-09-18 09:08:33 +00:00
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if (updatesLastUpdatedTime) {
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// Set current time as a last updated time.
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2013-09-27 14:12:12 +00:00
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HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_UPDATED_TIME_KEY,
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time(0));
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}
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if (!HeaderReadWriteUtils::writeHeaderAttributes(bufferToWrite, &attributeMapTowrite,
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&writingPos)) {
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return false;
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2013-09-18 09:08:33 +00:00
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}
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// Writes an actual header size.
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if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(bufferToWrite, writingPos,
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&headerSizeFieldPos)) {
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return false;
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}
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return true;
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}
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/* static */ HeaderReadWriteUtils::AttributeMap
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HeaderPolicy::createAttributeMapAndReadAllAttributes(const uint8_t *const dictBuf) {
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HeaderReadWriteUtils::AttributeMap attributeMap;
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HeaderReadWriteUtils::fetchAllHeaderAttributes(dictBuf, &attributeMap);
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2013-09-04 10:00:53 +00:00
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return attributeMap;
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}
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2013-06-11 03:01:49 +00:00
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} // namespace latinime
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