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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.
------------------------------------------------------------------------------*/
#include "CLucene/StdHeader.h"
#include "SegmentHeader.h"
#include "CLucene/store/IndexInput.h"
#include "Term.h"
CL_NS_DEF(index)
SegmentTermDocs::SegmentTermDocs(const SegmentReader* _parent){
//Func - Constructor
//Pre - Paren != NULL
//Post - The instance has been created
CND_PRECONDITION(_parent != NULL,"Parent is NULL");
parent = _parent;
deletedDocs = parent->deletedDocs;
_doc = 0;
_freq = 0;
count = 0;
df = 0;
skipInterval=0;
numSkips=0;
skipCount=0;
skipStream=NULL;
skipDoc=0;
freqPointer=0;
proxPointer=0;
skipPointer=0;
haveSkipped=false;
freqStream = parent->freqStream->clone();
skipInterval = parent->tis->getSkipInterval();
}
SegmentTermDocs::~SegmentTermDocs() {
//Func - Destructor
//Pre - true
//Post - The instance has been destroyed
close();
}
TermPositions* SegmentTermDocs::__asTermPositions(){
return NULL;
}
void SegmentTermDocs::seek(Term* term) {
TermInfo* ti = parent->tis->get(term);
seek(ti);
_CLDELETE(ti);
}
void SegmentTermDocs::seek(TermEnum* termEnum){
TermInfo* ti=NULL;
// use comparison of fieldinfos to verify that termEnum belongs to the same segment as this SegmentTermDocs
if ( termEnum->getObjectName() == SegmentTermEnum::getClassName() ){
SegmentTermEnum* te = (SegmentTermEnum*)termEnum;
te->fieldInfos = parent->fieldInfos;
ti = te->getTermInfo();
}else{
ti = parent->tis->get(termEnum->term(false));
}
seek(ti);
_CLDELETE(ti);
}
void SegmentTermDocs::seek(const TermInfo* ti) {
count = 0;
if (ti == NULL) {
df = 0;
} else {
df = ti->docFreq;
_doc = 0;
skipDoc = 0;
skipCount = 0;
numSkips = df / skipInterval;
freqPointer = ti->freqPointer;
proxPointer = ti->proxPointer;
skipPointer = freqPointer + ti->skipOffset;
freqStream->seek(freqPointer);
haveSkipped = false;
}
}
void SegmentTermDocs::close() {
//Check if freqStream still exists
if (freqStream != NULL){
freqStream->close(); //todo: items like these can probably be delete, because deleting the object also closes it...do everywhere
_CLDELETE( freqStream );
}
if (skipStream != NULL){
skipStream->close();
_CLDELETE( skipStream );
}
}
int32_t SegmentTermDocs::doc()const {
return _doc;
}
int32_t SegmentTermDocs::freq()const {
return _freq;
}
bool SegmentTermDocs::next()
{
while (true) {
if (count == df)
return false;
uint32_t docCode = freqStream->readVInt();
_doc += docCode >> 1; //unsigned shift
if ((docCode & 1) != 0) // if low bit is set
_freq = 1; // _freq is one
else
_freq = freqStream->readVInt(); // else read _freq
count++;
if (deletedDocs == NULL || (_doc >= 0 && !deletedDocs->get(_doc)))
break;
skippingDoc();
}
return true;
}
int32_t SegmentTermDocs::read(int32_t* docs, int32_t* freqs, int32_t length)
{
int32_t i = 0;
// TODO: one optimization would be to get the pointer buffer for ram or mmap
// dirs and iterate over them instead of using readByte() intensive functions.
while (i < length && count < df) {
uint32_t docCode = freqStream->readVInt();
_doc += docCode >> 1;
if ((docCode & 1) != 0) // if low bit is set
_freq = 1; // _freq is one
else
_freq = freqStream->readVInt(); // else read _freq
count++;
if (deletedDocs == NULL || (_doc >= 0 && !deletedDocs->get(_doc))) {
docs[i] = _doc;
freqs[i] = _freq;
i++;
}
}
return i;
}
bool SegmentTermDocs::skipTo(const int32_t target){
if (df >= skipInterval) { // optimized case
if (skipStream == NULL)
skipStream = freqStream->clone(); // lazily clone
if (!haveSkipped) { // lazily seek skip stream
skipStream->seek(skipPointer);
haveSkipped = true;
}
// scan skip data
int32_t lastSkipDoc = skipDoc;
int64_t lastFreqPointer = freqStream->getFilePointer();
int64_t lastProxPointer = -1;
int32_t numSkipped = -1 - (count % skipInterval);
while (target > skipDoc) {
lastSkipDoc = skipDoc;
lastFreqPointer = freqPointer;
lastProxPointer = proxPointer;
if (skipDoc != 0 && skipDoc >= _doc)
numSkipped += skipInterval;
if(skipCount >= numSkips)
break;
skipDoc += skipStream->readVInt();
freqPointer += skipStream->readVInt();
proxPointer += skipStream->readVInt();
skipCount++;
}
// if we found something to skip, then skip it
if (lastFreqPointer > freqStream->getFilePointer()) {
freqStream->seek(lastFreqPointer);
skipProx(lastProxPointer);
_doc = lastSkipDoc;
count += numSkipped;
}
}
// done skipping, now just scan
do {
if (!next())
return false;
} while (target > _doc);
return true;
}
CL_NS_END
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