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/*
* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team
*
* Distributable under the terms of either the Apache License (Version 2.0) or
* the GNU Lesser General Public License, as specified in the COPYING file.
*
* Changes are Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies), all rights reserved.
*/
#include "CLucene/StdHeader.h"
#include "TermInfosWriter.h"
#include "CLucene/store/Directory.h"
#include "CLucene/util/Misc.h"
#include "FieldInfos.h"
#include "Term.h"
#include "TermInfo.h"
#include "IndexWriter.h"
CL_NS_USE(util)
CL_NS_USE(store)
CL_NS_DEF(index)
TermInfosWriter::TermInfosWriter(Directory* directory, const QString& segment,
FieldInfos* fis, int32_t interval)
: fieldInfos(fis)
{
//Func - Constructor
//Pre - directory contains a valid reference to a Directory
// segment != NULL
// fis contains a valid reference to a reference FieldInfos
//Post - The instance has been created
CND_PRECONDITION(!segment.isEmpty(), "segment is NULL");
//Initialize instance
initialise(directory, segment, interval, false);
other = _CLNEW TermInfosWriter(directory, segment, fieldInfos, interval, true);
CND_CONDITION(other != NULL, "other is NULL");
other->other = this;
}
TermInfosWriter::TermInfosWriter(Directory* directory, const QString& segment,
FieldInfos* fis, int32_t interval, bool isIndex)
: fieldInfos(fis)
{
//Func - Constructor
//Pre - directory contains a valid reference to a Directory
// segment != NULL
// fis contains a valid reference to a reference FieldInfos
// isIndex is true or false
//Post - The instance has been created
CND_PRECONDITION(!segment.isEmpty(), "segment is NULL");
initialise(directory, segment, interval, isIndex);
}
void TermInfosWriter::initialise(Directory* directory, const QString& segment,
int32_t interval, bool IsIndex)
{
//Func - Helps constructors to initialize Instance
//Pre - directory contains a valid reference to a Directory
// segment != NULL
// fis contains a valid reference to a reference FieldInfos
//Post - The instance has been initialized
lastTerm = _CLNEW Term;
CND_CONDITION(lastTerm != NULL, "Could not allocate memory for lastTerm");
lastTi = _CLNEW TermInfo();
CND_CONDITION(lastTi != NULL, "Could not allocate memory for lastTi");
lastIndexPointer = 0;
size = 0;
isIndex = IsIndex;
indexInterval = interval;
skipInterval = LUCENE_DEFAULT_TERMDOCS_SKIP_INTERVAL;
QString buf = Misc::segmentname(segment, QLatin1String(isIndex ? ".tii" : ".tis"));
output = directory->createOutput(buf);
output->writeInt(FORMAT); // write format
output->writeLong(0); // leave space for size
output->writeInt(indexInterval);// write indexInterval
output->writeInt(skipInterval); // write skipInterval
//Set other to NULL by Default
other = NULL;
}
TermInfosWriter::~TermInfosWriter()
{
//Func - Destructor
//Pre - true
//Post - de instance has been destroyed
close();
}
void TermInfosWriter::add(Term* term, const TermInfo* ti)
{
//Func - Writes a Term and TermInfo to the outputstream
//Pre - Term must be lexicographically greater than all previous Terms added.
// Pointers of TermInfo ti (freqPointer and proxPointer) must be
// positive and greater than all previous.
CND_PRECONDITION(isIndex || (!isIndex && term->compareTo(lastTerm) > 0),"term out of order");
CND_PRECONDITION(ti->freqPointer >= lastTi->freqPointer,"freqPointer out of order");
CND_PRECONDITION(ti->proxPointer >= lastTi->proxPointer,"proxPointer out of order");
if (!isIndex && size % indexInterval == 0) {
//add an index term
other->add(lastTerm, lastTi);
}
//write term
writeTerm(term);
// write doc freq
output->writeVInt(ti->docFreq);
//write pointers
output->writeVLong(ti->freqPointer - lastTi->freqPointer);
output->writeVLong(ti->proxPointer - lastTi->proxPointer);
if (ti->docFreq >= skipInterval) {
output->writeVInt(ti->skipOffset);
}
if (isIndex){
output->writeVLong(other->output->getFilePointer() - lastIndexPointer);
lastIndexPointer = other->output->getFilePointer(); // write pointer
}
lastTi->set(ti);
size++;
}
void TermInfosWriter::close() {
//Func - Closes the TermInfosWriter
//Pre - true
//Post - The TermInfosWriter has been closed
if (output){
//write size at start
output->seek(4); // write size after format
output->writeLong(size);
output->close();
_CLDELETE(output);
if (!isIndex){
if(other){
other->close();
_CLDELETE( other );
}
}
_CLDECDELETE(lastTerm);
_CLDELETE(lastTi);
}
}
void TermInfosWriter::writeTerm(Term* term)
{
int32_t start = Misc::stringDifference(lastTerm->text(),lastTerm->textLength(),
term->text(),term->textLength());
int32_t length = term->textLength() - start;
output->writeVInt(start); // write shared prefix length
output->writeVInt(length); // write delta length
output->writeChars(term->text(), start, length); // write delta chars
int32_t fieldnum = fieldInfos->fieldNumber(term->field());
CND_PRECONDITION(fieldnum>=-1&&fieldnum<fieldInfos->size(),"Fieldnum is out of range");
output->writeVInt(fieldnum); // write field num
if ( lastTerm->__cl_refcount == 1 ){
lastTerm->set(term,term->text());
}else{
_CLDECDELETE(lastTerm);
lastTerm = _CL_POINTER(term);
}
}
CL_NS_END
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