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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 "dictionary/structure/v4/content/terminal_position_lookup_table.h"
#include "dictionary/utils/buffer_with_extendable_buffer.h"
namespace latinime {
int TerminalPositionLookupTable::getTerminalPtNodePosition(const int terminalId) const {
if (terminalId < 0 || terminalId >= mSize) {
return NOT_A_DICT_POS;
}
const int terminalPos = getBuffer()->readUint(
Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(terminalId));
return (terminalPos == Ver4DictConstants::NOT_A_TERMINAL_ADDRESS) ?
NOT_A_DICT_POS : terminalPos;
}
bool TerminalPositionLookupTable::setTerminalPtNodePosition(
const int terminalId, const int terminalPtNodePos) {
if (terminalId < 0) {
return false;
}
while (terminalId >= mSize) {
// Write new entry.
if (!getWritableBuffer()->writeUint(Ver4DictConstants::NOT_A_TERMINAL_ADDRESS,
Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(mSize))) {
return false;
}
mSize++;
}
const int terminalPos = (terminalPtNodePos != NOT_A_DICT_POS) ?
terminalPtNodePos : Ver4DictConstants::NOT_A_TERMINAL_ADDRESS;
return getWritableBuffer()->writeUint(terminalPos,
Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(terminalId));
}
bool TerminalPositionLookupTable::flushToFile(FILE *const file) const {
// If the used buffer size is smaller than the actual buffer size, regenerate the lookup
// table and write the new table to the file.
if (getEntryPos(mSize) < getBuffer()->getTailPosition()) {
TerminalPositionLookupTable lookupTableToWrite;
for (int i = 0; i < mSize; ++i) {
const int terminalPtNodePosition = getTerminalPtNodePosition(i);
if (!lookupTableToWrite.setTerminalPtNodePosition(i, terminalPtNodePosition)) {
AKLOGE("Cannot set terminal position to lookupTableToWrite."
" terminalId: %d, position: %d", i, terminalPtNodePosition);
return false;
}
}
return lookupTableToWrite.flush(file);
} else {
// We can simply use this lookup table because the buffer size has not been
// changed.
return flush(file);
}
}
bool TerminalPositionLookupTable::runGCTerminalIds(TerminalIdMap *const terminalIdMap) {
int removedEntryCount = 0;
int nextNewTerminalId = 0;
for (int i = 0; i < mSize; ++i) {
const int terminalPos = getBuffer()->readUint(
Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(i));
if (terminalPos == Ver4DictConstants::NOT_A_TERMINAL_ADDRESS) {
// This entry is a garbage.
removedEntryCount++;
} else {
// Give a new terminal id to the entry.
if (!getWritableBuffer()->writeUint(terminalPos,
Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE,
getEntryPos(nextNewTerminalId))) {
return false;
}
// Memorize the mapping to the old terminal id to the new terminal id.
terminalIdMap->insert(TerminalIdMap::value_type(i, nextNewTerminalId));
nextNewTerminalId++;
}
}
mSize = nextNewTerminalId;
return true;
}
} // namespace latinime
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