/**
* Opens the index.
*
* IndexReader constructor needs Directory as a parameter. It should be
* a string with a path to the index folder or a Directory object.
*
* @param mixed $directory
* @throws Zend_Search_Lucene_Exception
*/
public function __construct($directory = null, $create = false)
{
if ($directory === null) {
throw new Zend_Search_Exception('No index directory specified');
}
if ($directory instanceof ZSearchFSDirectory) {
$this->_directory = $directory;
} else {
$this->_directory = new ZSearchFSDirectory($directory);
}
if ($create) {
$this->_writer = new Zend_Search_Lucene_Index_Writer($this->_directory, true);
} else {
$this->_writer = null;
}
$this->_segmentInfos = array();
$segmentsFile = $this->_directory->getFileObject('segments');
$format = $segmentsFile->readInt();
if ($format != (int) 0xffffffff) {
throw new Zend_Search_Lucene_Exception('Wrong segments file format');
}
// read version
$segmentsFile->readLong();
// read counter
$segmentsFile->readInt();
$segments = $segmentsFile->readInt();
$this->_docCount = 0;
// read segmentInfos
for ($count = 0; $count < $segments; $count++) {
$segName = $segmentsFile->readString();
$segSize = $segmentsFile->readInt();
$this->_docCount += $segSize;
$this->_segmentInfos[$count] = new Zend_Search_Lucene_Index_SegmentInfo($segName, $segSize, $this->_directory);
}
}
/**
* Generate compound index file
*/
private function _generateCFS()
{
$cfsFile = $this->_directory->createFile($this->_name . '.cfs');
$cfsFile->writeVInt(count($this->_files));
$dataOffsetPointers = array();
foreach ($this->_files as $fileName) {
$dataOffsetPointers[$fileName] = $cfsFile->tell();
$cfsFile->writeLong(0);
// write dummy data
$cfsFile->writeString($fileName);
}
foreach ($this->_files as $fileName) {
// Get actual data offset
$dataOffset = $cfsFile->tell();
// Seek to the data offset pointer
$cfsFile->seek($dataOffsetPointers[$fileName]);
// Write actual data offset value
$cfsFile->writeLong($dataOffset);
// Seek back to the end of file
$cfsFile->seek($dataOffset);
$dataFile = $this->_directory->getFileObject($fileName);
$cfsFile->writeBytes($dataFile->readBytes($this->_directory->fileLength($fileName)));
$this->_directory->deleteFile($fileName);
}
}
/**
* Update segments file by adding current segment to a list
* @todo !!!!!Finish the implementation
*
* @throws Zend_Search_Lucene_Exception
*/
private function _updateSegments()
{
$segmentsFile = $this->_directory->getFileObject('segments');
$newSegmentFile = $this->_directory->createFile('segments.new');
$newSegmentFile->writeInt((int) 0xffffffff);
$newSegmentFile->writeLong($this->_version);
$newSegmentFile->writeInt($this->_segmentNameCounter);
$newSegmentFile->writeInt($this->_segments + count($this->_newSegments));
$segmentsFile->seek(20);
$newSegmentFile->writeBytes($segmentsFile->readBytes($segmentsFile->tell() - 20));
foreach ($this->_newSegments as $segmentName => $segmentInfo) {
$newSegmentFile->writeString($segmentName);
$newSegmentFile->writeInt($segmentInfo->count());
}
$this->_directory->renameFile('segments.new', 'segments');
}