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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2011 Peng Wu <alexepico@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PHRASE_LOGGER_H
#define PHRASE_LOGGER_H
#include <assert.h>
#include "novel_types.h"
#include "memory_chunk.h"
/**
* File Format
* Logger Record type: add/remove/modify
*
* Modify Header: header/null token/len/old data chunk/new data chunk
*
* Add Record: add/token/len/data chunk
* Remove Record: remove/token/len/data chunk
* Modify Record: modify/token/old len/new len/old data chunk/new data chunk
*
*/
namespace pinyin{
enum LOG_TYPE{
LOG_INVALID_RECORD = 0,
LOG_ADD_RECORD = 1,
LOG_REMOVE_RECORD,
LOG_MODIFY_RECORD,
LOG_MODIFY_HEADER
};
/**
* PhraseIndexLogger:
*
* The logger of phrase index changes.
*
*/
class PhraseIndexLogger{
protected:
MemoryChunk * m_chunk;
size_t m_offset;
bool m_error;
void reset(){
if ( m_chunk ){
delete m_chunk;
m_chunk = NULL;
}
m_offset = 0;
m_error = false;
}
public:
/**
* PhraseIndexLogger::PhraseIndexLogger:
*
* The constructor of the PhraseIndexLogger.
*
*/
PhraseIndexLogger():m_offset(0), m_error(false){
m_chunk = new MemoryChunk;
}
/**
* PhraseIndexLogger::~PhraseIndexLogger:
*
* The destructor of the PhraseIndexLogger.
*
*/
~PhraseIndexLogger(){
reset();
}
/**
* PhraseIndexLogger::load:
* @chunk: the memory chunk of the logs.
* @returns: whether the load operation is successful.
*
* Load the logs from the memory chunk.
*
*/
bool load(MemoryChunk * chunk) {
reset();
m_chunk = chunk;
return true;
}
/**
* PhraseIndexLogger::store:
* @new_chunk: the new memory chunk to store the logs.
* @returns: whether the store operation is successful.
*
* Store the logs to the new memory chunk.
*
*/
bool store(MemoryChunk * new_chunk){
new_chunk->set_content(0, m_chunk->begin(), m_chunk->size());
return true;
}
/**
* PhraseIndexLogger::has_next_record:
* @returns: whether this logger has next record.
*
* Whether this logger has next record.
*
*/
bool has_next_record(){
if (m_error)
return false;
return m_offset < m_chunk->size();
}
/**
* PhraseIndexLogger::rewind:
* @returns: whether the rewind operation is successful.
*
* Rewind this logger to the begin of logs.
*
*/
bool rewind(){
m_offset = 0;
return true;
}
/**
* PhraseIndexLogger::next_record:
* @log_type: the type of this log record.
* @token: the token of this log record.
* @oldone: the original content of the phrase item.
* @newone: the new content of the phrase item.
*
* Read the next log record.
*
* Prolog: has_next_record() returned true.
*
*/
bool next_record(LOG_TYPE & log_type, phrase_token_t & token,
MemoryChunk * oldone, MemoryChunk * newone){
log_type = LOG_INVALID_RECORD;
token = null_token;
size_t offset = m_offset;
m_chunk->get_content(offset, &log_type, sizeof(LOG_TYPE));
offset += sizeof(LOG_TYPE);
m_chunk->get_content(offset, &token, sizeof(phrase_token_t));
offset += sizeof(phrase_token_t);
oldone->set_size(0); newone->set_size(0);
switch(log_type){
case LOG_ADD_RECORD:{
guint16 len = 0;
m_chunk->get_content(offset, &len, sizeof(guint16));
offset += sizeof(guint16);
newone->set_content(0, ((char *)m_chunk->begin()) + offset, len);
offset += len;
break;
}
case LOG_REMOVE_RECORD:{
guint16 len = 0;
m_chunk->get_content(offset, &len, sizeof(guint16));
offset += sizeof(guint16);
oldone->set_content(0, ((char *)m_chunk->begin()) + offset, len);
offset += len;
break;
}
case LOG_MODIFY_RECORD:{
guint16 oldlen = 0, newlen = 0;
m_chunk->get_content(offset, &oldlen, sizeof(guint16));
offset += sizeof(guint16);
m_chunk->get_content(offset, &newlen, sizeof(guint16));
offset += sizeof(guint16);
oldone->set_content(0, ((char *)m_chunk->begin()) + offset,
oldlen);
offset += oldlen;
newone->set_content(0, ((char *)m_chunk->begin()) + offset, newlen);
offset += newlen;
break;
}
case LOG_MODIFY_HEADER:{
assert(token == null_token);
guint16 len = 0;
m_chunk->get_content(offset, &len, sizeof(guint16));
offset += sizeof(guint16);
oldone->set_content(0, ((char *)m_chunk->begin()) + offset,
len);
offset += len;
newone->set_content(0, ((char *)m_chunk->begin()) + offset,
len);
offset += len;
break;
}
default:
m_error = true;
return false;
}
m_offset = offset;
return true;
}
/**
* PhraseIndexLogger::append_record:
* @log_type: the type of this log record.
* @token: the token of this log record.
* @oldone: the original content of the phrase item.
* @newone: the new content of the phrase item.
*
* Append one log record to the logger.
*
*/
bool append_record(LOG_TYPE log_type, phrase_token_t token,
MemoryChunk * oldone, MemoryChunk * newone){
MemoryChunk chunk;
size_t offset = 0;
chunk.set_content(offset, &log_type, sizeof(LOG_TYPE));
offset += sizeof(LOG_TYPE);
chunk.set_content(offset, &token, sizeof(phrase_token_t));
offset += sizeof(phrase_token_t);
switch(log_type){
case LOG_ADD_RECORD:{
assert( NULL == oldone );
assert( NULL != newone );
/* use newone chunk */
guint16 len = newone->size();
chunk.set_content(offset, &len, sizeof(guint16));
offset += sizeof(guint16);
chunk.set_content(offset, newone->begin(), newone->size());
offset += newone->size();
break;
}
case LOG_REMOVE_RECORD:{
assert(NULL != oldone);
assert(NULL == newone);
/* use oldone chunk */
guint16 len = oldone->size();
chunk.set_content(offset, &len, sizeof(guint16));
offset += sizeof(guint16);
chunk.set_content(offset, oldone->begin(), oldone->size());
offset += oldone->size();
break;
}
case LOG_MODIFY_RECORD:{
assert(NULL != oldone);
assert(NULL != newone);
guint16 oldlen = oldone->size();
guint16 newlen = newone->size();
chunk.set_content(offset, &oldlen, sizeof(guint16));
offset += sizeof(guint16);
chunk.set_content(offset, &newlen, sizeof(guint16));
offset += sizeof(guint16);
chunk.set_content(offset, oldone->begin(), oldone->size());
offset += oldlen;
chunk.set_content(offset, newone->begin(), newone->size());
offset += newlen;
break;
}
case LOG_MODIFY_HEADER:{
assert(NULL != oldone);
assert(NULL != newone);
assert(null_token == token);
guint16 oldlen = oldone->size();
guint16 newlen = newone->size();
assert(oldlen == newlen);
chunk.set_content(offset, &oldlen, sizeof(guint16));
offset += sizeof(guint16);
chunk.set_content(offset, oldone->begin(), oldone->size());
offset += oldlen;
chunk.set_content(offset, newone->begin(), newone->size());
offset += newlen;
break;
}
default:
assert(false);
}
/* store log record. */
m_chunk->set_content(m_chunk->size(), chunk.begin(), chunk.size());
return true;
}
};
};
#endif
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