/**
* 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 Zend_Search_Lucene_Storage_Directory_Filesystem) {
$this->_directory = $directory;
$this->_closeDirOnExit = false;
} else {
$this->_directory = new Zend_Search_Lucene_Storage_Directory_Filesystem($directory);
$this->_closeDirOnExit = true;
}
// Get a shared lock to the index
$this->_lock = $this->_directory->createFile('index.lock');
$this->_segmentInfos = array();
if ($create) {
// Throw an exception if index is under processing now
if (!$this->_lock->lock(LOCK_EX, true)) {
throw new Zend_Search_Lucene_Exception('Can\'t create index. It\'s under processing now');
}
// Writer will create segments file for empty segments list
$this->_writer = new Zend_Search_Lucene_Index_Writer($this->_directory, $this->_segmentInfos, true);
if (!$this->_lock->lock(LOCK_SH)) {
throw new Zend_Search_Lucene_Exception('Can\'t reduce lock level from Exclusive to Shared');
}
} else {
// Wait if index is under switching from one set of segments to another (Index_Writer::_updateSegments())
if (!$this->_lock->lock(LOCK_SH)) {
throw new Zend_Search_Lucene_Exception('Can\'t obtain shared index lock');
}
$this->_writer = null;
}
$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();
$segmentsFile->readInt(); $segmentsFile->readInt();
// read segment name 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;
$this->_segmentInfos[] =
new Zend_Search_Lucene_Index_SegmentInfo($segName,
$segSize,
$this->_directory);
}
}
