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/*
* Copyright (C) 2011 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.
*/
#ifndef LATINIME_WORDS_PRIORITY_QUEUE_H
#define LATINIME_WORDS_PRIORITY_QUEUE_H
#include <iostream>
#include <queue>
#include "defines.h"
namespace latinime {
class WordsPriorityQueue {
public:
class SuggestedWord {
public:
int mScore;
unsigned short mWord[MAX_WORD_LENGTH_INTERNAL];
int mWordLength;
bool mUsed;
void setParams(int score, unsigned short* word, int wordLength) {
mScore = score;
mWordLength = wordLength;
memcpy(mWord, word, sizeof(unsigned short) * wordLength);
mUsed = true;
}
};
WordsPriorityQueue(int maxWords, int maxWordLength) :
MAX_WORDS((unsigned int) maxWords), MAX_WORD_LENGTH(
(unsigned int) maxWordLength) {
mSuggestedWords = new SuggestedWord[maxWordLength];
for (int i = 0; i < maxWordLength; ++i) {
mSuggestedWords[i].mUsed = false;
}
mHighestSuggestedWord = 0;
}
~WordsPriorityQueue() {
delete[] mSuggestedWords;
}
void push(int score, unsigned short* word, int wordLength) {
SuggestedWord* sw = 0;
if (mSuggestions.size() >= MAX_WORDS) {
sw = mSuggestions.top();
const int minScore = sw->mScore;
if (minScore >= score) {
return;
} else {
sw->mUsed = false;
mSuggestions.pop();
}
}
if (sw == 0) {
sw = getFreeSuggestedWord(score, word, wordLength);
} else {
sw->setParams(score, word, wordLength);
}
if (sw == 0) {
AKLOGE("SuggestedWord is accidentally null.");
return;
}
if (DEBUG_WORDS_PRIORITY_QUEUE) {
AKLOGI("Push word. %d, %d", score, wordLength);
DUMP_WORD(word, wordLength);
}
mSuggestions.push(sw);
if (!mHighestSuggestedWord || mHighestSuggestedWord->mScore < sw->mScore) {
mHighestSuggestedWord = sw;
}
}
SuggestedWord* top() {
if (mSuggestions.empty()) return 0;
SuggestedWord* sw = mSuggestions.top();
return sw;
}
int outputSuggestions(int *frequencies, unsigned short *outputChars) {
mHighestSuggestedWord = 0;
const unsigned int size = min(MAX_WORDS, mSuggestions.size());
int index = size - 1;
while (!mSuggestions.empty() && index >= 0) {
SuggestedWord* sw = mSuggestions.top();
if (DEBUG_WORDS_PRIORITY_QUEUE) {
AKLOGI("dump word. %d", sw->mScore);
DUMP_WORD(sw->mWord, sw->mWordLength);
}
const unsigned int wordLength = sw->mWordLength;
char* targetAdr = (char*) outputChars
+ (index) * MAX_WORD_LENGTH * sizeof(short);
frequencies[index] = sw->mScore;
memcpy(targetAdr, sw->mWord, (wordLength) * sizeof(short));
if (wordLength < MAX_WORD_LENGTH) {
((unsigned short*) targetAdr)[wordLength] = 0;
}
sw->mUsed = false;
mSuggestions.pop();
--index;
}
return size;
}
int size() const {
return mSuggestions.size();
}
void clear() {
mHighestSuggestedWord = 0;
while (!mSuggestions.empty()) {
SuggestedWord* sw = mSuggestions.top();
if (DEBUG_WORDS_PRIORITY_QUEUE) {
AKLOGI("Clear word. %d", sw->mScore);
DUMP_WORD(sw->mWord, sw->mWordLength);
}
sw->mUsed = false;
mSuggestions.pop();
}
}
void dumpTopWord() {
if (size() <= 0) {
return;
}
DUMP_WORD(mHighestSuggestedWord->mWord, mHighestSuggestedWord->mWordLength);
}
double getHighestNormalizedScore(const unsigned short* before, const int beforeLength,
unsigned short** outWord, int *outScore, int *outLength) {
if (!mHighestSuggestedWord) {
return 0.0;
}
SuggestedWord* sw = mHighestSuggestedWord;
const int score = sw->mScore;
unsigned short* word = sw->mWord;
const int wordLength = sw->mWordLength;
if (outScore) {
*outScore = score;
}
if (outWord) {
*outWord = word;
}
if (outLength) {
*outLength = wordLength;
}
return Correction::RankingAlgorithm::calcNormalizedScore(
before, beforeLength, word, wordLength, score);
}
private:
struct wordComparator {
bool operator ()(SuggestedWord * left, SuggestedWord * right) {
return left->mScore > right->mScore;
}
};
SuggestedWord* getFreeSuggestedWord(int score, unsigned short* word,
int wordLength) {
for (unsigned int i = 0; i < MAX_WORD_LENGTH; ++i) {
if (!mSuggestedWords[i].mUsed) {
mSuggestedWords[i].setParams(score, word, wordLength);
return &mSuggestedWords[i];
}
}
return 0;
}
typedef std::priority_queue<SuggestedWord*, std::vector<SuggestedWord*>,
wordComparator> Suggestions;
Suggestions mSuggestions;
const unsigned int MAX_WORDS;
const unsigned int MAX_WORD_LENGTH;
SuggestedWord* mSuggestedWords;
SuggestedWord* mHighestSuggestedWord;
};
}
#endif // LATINIME_WORDS_PRIORITY_QUEUE_H
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