/**
* Execute query in context of index reader
* It also initializes necessary internal structures
*
* @param \Zend\Search\Lucene\SearchIndex $reader
* @param \Zend\Search\Lucene\Index\DocsFilter|null $docsFilter
*/
public function execute(Lucene\SearchIndex $reader, $docsFilter = null)
{
$this->_docVector = array_flip($reader->termDocs($this->_term, $docsFilter));
$this->_termFreqs = $reader->termFreqs($this->_term, $docsFilter);
// Initialize weight if it's not done yet
$this->_initWeight($reader);
}
/**
* Calculate result vector for non Conjunction query
* (like '+something -another')
*
* @param \Zend\Search\Lucene\SearchIndex $reader
*/
private function _calculateNonConjunctionResult(Lucene\SearchIndex $reader)
{
$requiredVectors = array();
$requiredVectorsSizes = array();
$requiredVectorsIds = array();
// is used to prevent arrays comparison
$optional = array();
$prohibited = array();
foreach ($this->_terms as $termId => $term) {
$termDocs = array_flip($reader->termDocs($term));
if ($this->_signs[$termId] === true) {
// required
$requiredVectors[] = $termDocs;
$requiredVectorsSizes[] = count($termDocs);
$requiredVectorsIds[] = $termId;
} elseif ($this->_signs[$termId] === false) {
// prohibited
// array union
$prohibited += $termDocs;
} else {
// neither required, nor prohibited
// array union
$optional += $termDocs;
}
$this->_termsFreqs[$termId] = $reader->termFreqs($term);
}
// sort resvectors in order of subquery cardinality increasing
array_multisort($requiredVectorsSizes, SORT_ASC, SORT_NUMERIC, $requiredVectorsIds, SORT_ASC, SORT_NUMERIC, $requiredVectors);
$required = null;
foreach ($requiredVectors as $nextResVector) {
if ($required === null) {
$required = $nextResVector;
} else {
//$required = array_intersect_key($required, $nextResVector);
/**
* This code is used as workaround for array_intersect_key() slowness problem.
*/
$updatedVector = array();
foreach ($required as $id => $value) {
if (isset($nextResVector[$id])) {
$updatedVector[$id] = $value;
}
}
$required = $updatedVector;
}
if (count($required) == 0) {
// Empty result set, we don't need to check other terms
break;
}
}
if ($required !== null) {
$this->_resVector = $required;
} else {
$this->_resVector = $optional;
}
if (count($prohibited) != 0) {
// $this->_resVector = array_diff_key($this->_resVector, $prohibited);
/**
* This code is used as workaround for array_diff_key() slowness problem.
*/
if (count($this->_resVector) < count($prohibited)) {
$updatedVector = $this->_resVector;
foreach ($this->_resVector as $id => $value) {
if (isset($prohibited[$id])) {
unset($updatedVector[$id]);
}
}
$this->_resVector = $updatedVector;
} else {
$updatedVector = $this->_resVector;
foreach ($prohibited as $id => $value) {
unset($updatedVector[$id]);
}
$this->_resVector = $updatedVector;
}
}
ksort($this->_resVector, SORT_NUMERIC);
}
