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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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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
*
* 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_ADD_RECORD = 1,
LOG_REMOVE_RECORD = 2,
LOG_MODIFY_RECORD = 3
};
class PhraseIndexLogger{
protected:
MemoryChunk * m_chunk;
size_t m_offset;
void reset(){
if ( m_chunk ){
delete m_chunk;
m_chunk = NULL;
}
m_offset = 0;
}
public:
PhraseIndexLogger():m_offset(0){
m_chunk = new MemoryChunk;
}
~PhraseIndexLogger(){
reset();
}
bool load(MemoryChunk * chunk) {
reset();
m_chunk = chunk;
return true;
}
bool store(MemoryChunk * new_chunk){
new_chunk->set_content(0, m_chunk->begin(), m_chunk->size());
return true;
}
bool has_next_record(){
return m_offset < m_chunk->size();
}
bool rewind(){
m_offset = 0;
return true;
}
/* prolog: has_next_record() returned true. */
bool next_record(LOG_TYPE & log_type, phrase_token_t & token,
MemoryChunk * oldone, MemoryChunk * newone){
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);
switch(log_type){
case LOG_ADD_RECORD:{
oldone->set_size(0);
size_t len = 0;
m_chunk->get_content(offset, &len, sizeof(size_t));
offset += sizeof(size_t);
newone->set_content(0, ((char *)m_chunk->begin()) + offset, len);
offset += len;
break;
}
case LOG_REMOVE_RECORD:{
newone->set_size(0);
size_t len = 0;
m_chunk->get_content(offset, &len, sizeof(size_t));
offset += sizeof(size_t);
oldone->set_content(0, ((char *)m_chunk->begin()) + offset, len);
offset += len;
break;
}
case LOG_MODIFY_RECORD:{
size_t oldlen = 0, newlen = 0;
m_chunk->get_content(offset, &oldlen, sizeof(size_t));
offset += sizeof(size_t);
m_chunk->get_content(offset, &newlen, sizeof(size_t));
offset += sizeof(size_t);
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;
}
default:
assert(false);
}
m_offset = offset;
return true;
}
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 */
size_t len = newone->size();
chunk.set_content(offset, &len, sizeof(size_t));
offset += sizeof(size_t);
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 */
size_t len = oldone->size();
chunk.set_content(offset, &len, sizeof(size_t));
offset += sizeof(size_t);
chunk.set_content(offset, oldone->begin(), oldone->size());
offset += oldone->size();
break;
}
case LOG_MODIFY_RECORD:{
assert(NULL != oldone);
assert(NULL != newone);
size_t oldlen = oldone->size();
size_t newlen = newone->size();
chunk.set_content(offset, &oldlen, sizeof(size_t));
offset += sizeof(size_t);
chunk.set_content(offset, &newlen, sizeof(size_t));
offset += sizeof(size_t);
chunk.set_content(offset, oldone->begin(), oldone->size());
offset += oldone->size();
chunk.set_content(offset, newone->begin(), newone->size());
offset += newone->size();
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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