sfluceneplugin /lib/vendor/Zend/Search/Lucene/MultiSearcher.php

Language PHP Lines 974
MD5 Hash 51b8f5f1e7e449ca097cea7b2c809f36 Estimated Cost $11,355 (why?)
Repository https://bitbucket.org/anycode/sfluceneplugin.git View Raw File View Project SPDX
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Search_Lucene
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: MultiSearcher.php 22967 2010-09-18 18:53:58Z ramon $
 */


/** Zend_Search_Lucene_Interface */
require_once 'Zend/Search/Lucene/Interface.php';

/**
 * Multisearcher allows to search through several independent indexes.
 *
 * @category   Zend
 * @package    Zend_Search_Lucene
 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Search_Lucene_Interface_MultiSearcher implements Zend_Search_Lucene_Interface
{
    /**
     * List of indices for searching.
     * Array of Zend_Search_Lucene_Interface objects
     *
     * @var array
     */
    protected $_indices;

    /**
     * Object constructor.
     *
     * @param array $indices   Arrays of indices for search
     * @throws Zend_Search_Lucene_Exception
     */
    public function __construct($indices = array())
    {
        $this->_indices = $indices;

        foreach ($this->_indices as $index) {
            if (!$index instanceof Zend_Search_Lucene_Interface) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('sub-index objects have to implement Zend_Search_Lucene_Interface.');
            }
        }
    }

    /**
     * Add index for searching.
     *
     * @param Zend_Search_Lucene_Interface $index
     */
    public function addIndex(Zend_Search_Lucene_Interface $index)
    {
        $this->_indices[] = $index;
    }


    /**
     * Get current generation number
     *
     * Returns generation number
     * 0 means pre-2.1 index format
     * -1 means there are no segments files.
     *
     * @param Zend_Search_Lucene_Storage_Directory $directory
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public static function getActualGeneration(Zend_Search_Lucene_Storage_Directory $directory)
    {
        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception("Generation number can't be retrieved for multi-searcher");
    }

    /**
     * Get segments file name
     *
     * @param integer $generation
     * @return string
     */
    public static function getSegmentFileName($generation)
    {
        return Zend_Search_Lucene::getSegmentFileName($generation);
    }

    /**
     * Get index format version
     *
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public function getFormatVersion()
    {
        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception("Format version can't be retrieved for multi-searcher");
    }

    /**
     * Set index format version.
     * Index is converted to this format at the nearest upfdate time
     *
     * @param int $formatVersion
     */
    public function setFormatVersion($formatVersion)
    {
        foreach ($this->_indices as $index) {
            $index->setFormatVersion($formatVersion);
        }
    }

    /**
     * Returns the Zend_Search_Lucene_Storage_Directory instance for this index.
     *
     * @return Zend_Search_Lucene_Storage_Directory
     */
    public function getDirectory()
    {
        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception("Index directory can't be retrieved for multi-searcher");
    }

    /**
     * Returns the total number of documents in this index (including deleted documents).
     *
     * @return integer
     */
    public function count()
    {
        $count = 0;

        foreach ($this->_indices as $index) {
            $count += $index->count();
        }

        return $count;
    }

    /**
     * Returns one greater than the largest possible document number.
     * This may be used to, e.g., determine how big to allocate a structure which will have
     * an element for every document number in an index.
     *
     * @return integer
     */
    public function maxDoc()
    {
        return $this->count();
    }

    /**
     * Returns the total number of non-deleted documents in this index.
     *
     * @return integer
     */
    public function numDocs()
    {
        $docs = 0;

        foreach ($this->_indices as $index) {
            $docs += $index->numDocs();
        }

        return $docs;
    }

    /**
     * Checks, that document is deleted
     *
     * @param integer $id
     * @return boolean
     * @throws Zend_Search_Lucene_Exception    Exception is thrown if $id is out of the range
     */
    public function isDeleted($id)
    {
        foreach ($this->_indices as $index) {
            $indexCount = $index->count();

            if ($indexCount > $id) {
                return $index->isDeleted($id);
            }

            $id -= $indexCount;
        }

        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
    }

    /**
     * Set default search field.
     *
     * Null means, that search is performed through all fields by default
     *
     * Default value is null
     *
     * @param string $fieldName
     */
    public static function setDefaultSearchField($fieldName)
    {
        foreach ($this->_indices as $index) {
            $index->setDefaultSearchField($fieldName);
        }
    }


    /**
     * Get default search field.
     *
     * Null means, that search is performed through all fields by default
     *
     * @return string
     * @throws Zend_Search_Lucene_Exception
     */
    public static function getDefaultSearchField()
    {
        if (count($this->_indices) == 0) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Indices list is empty');
        }

        $defaultSearchField = reset($this->_indices)->getDefaultSearchField();

        foreach ($this->_indices as $index) {
            if ($index->getDefaultSearchField() !== $defaultSearchField) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
            }
        }

        return $defaultSearchField;
    }

    /**
     * Set result set limit.
     *
     * 0 (default) means no limit
     *
     * @param integer $limit
     */
    public static function setResultSetLimit($limit)
    {
        foreach ($this->_indices as $index) {
            $index->setResultSetLimit($limit);
        }
    }

    /**
     * Set result set limit.
     *
     * 0 means no limit
     *
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public static function getResultSetLimit()
    {
        if (count($this->_indices) == 0) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Indices list is empty');
        }

        $defaultResultSetLimit = reset($this->_indices)->getResultSetLimit();

        foreach ($this->_indices as $index) {
            if ($index->getResultSetLimit() !== $defaultResultSetLimit) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
            }
        }

        return $defaultResultSetLimit;
    }

    /**
     * Retrieve index maxBufferedDocs option
     *
     * maxBufferedDocs is a minimal number of documents required before
     * the buffered in-memory documents are written into a new Segment
     *
     * Default value is 10
     *
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public function getMaxBufferedDocs()
    {
        if (count($this->_indices) == 0) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Indices list is empty');
        }

        $maxBufferedDocs = reset($this->_indices)->getMaxBufferedDocs();

        foreach ($this->_indices as $index) {
            if ($index->getMaxBufferedDocs() !== $maxBufferedDocs) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
            }
        }

        return $maxBufferedDocs;
    }

    /**
     * Set index maxBufferedDocs option
     *
     * maxBufferedDocs is a minimal number of documents required before
     * the buffered in-memory documents are written into a new Segment
     *
     * Default value is 10
     *
     * @param integer $maxBufferedDocs
     */
    public function setMaxBufferedDocs($maxBufferedDocs)
    {
        foreach ($this->_indices as $index) {
            $index->setMaxBufferedDocs($maxBufferedDocs);
        }
    }

    /**
     * Retrieve index maxMergeDocs option
     *
     * maxMergeDocs is a largest number of documents ever merged by addDocument().
     * Small values (e.g., less than 10,000) are best for interactive indexing,
     * as this limits the length of pauses while indexing to a few seconds.
     * Larger values are best for batched indexing and speedier searches.
     *
     * Default value is PHP_INT_MAX
     *
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public function getMaxMergeDocs()
    {
        if (count($this->_indices) == 0) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Indices list is empty');
        }

        $maxMergeDocs = reset($this->_indices)->getMaxMergeDocs();

        foreach ($this->_indices as $index) {
            if ($index->getMaxMergeDocs() !== $maxMergeDocs) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
            }
        }

        return $maxMergeDocs;
    }

    /**
     * Set index maxMergeDocs option
     *
     * maxMergeDocs is a largest number of documents ever merged by addDocument().
     * Small values (e.g., less than 10,000) are best for interactive indexing,
     * as this limits the length of pauses while indexing to a few seconds.
     * Larger values are best for batched indexing and speedier searches.
     *
     * Default value is PHP_INT_MAX
     *
     * @param integer $maxMergeDocs
     */
    public function setMaxMergeDocs($maxMergeDocs)
    {
        foreach ($this->_indices as $index) {
            $index->setMaxMergeDocs($maxMergeDocs);
        }
    }

    /**
     * Retrieve index mergeFactor option
     *
     * mergeFactor determines how often segment indices are merged by addDocument().
     * With smaller values, less RAM is used while indexing,
     * and searches on unoptimized indices are faster,
     * but indexing speed is slower.
     * With larger values, more RAM is used during indexing,
     * and while searches on unoptimized indices are slower,
     * indexing is faster.
     * Thus larger values (> 10) are best for batch index creation,
     * and smaller values (< 10) for indices that are interactively maintained.
     *
     * Default value is 10
     *
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public function getMergeFactor()
    {
        if (count($this->_indices) == 0) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Indices list is empty');
        }

        $mergeFactor = reset($this->_indices)->getMergeFactor();

        foreach ($this->_indices as $index) {
            if ($index->getMergeFactor() !== $mergeFactor) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('Indices have different default search field.');
            }
        }

        return $mergeFactor;
    }

    /**
     * Set index mergeFactor option
     *
     * mergeFactor determines how often segment indices are merged by addDocument().
     * With smaller values, less RAM is used while indexing,
     * and searches on unoptimized indices are faster,
     * but indexing speed is slower.
     * With larger values, more RAM is used during indexing,
     * and while searches on unoptimized indices are slower,
     * indexing is faster.
     * Thus larger values (> 10) are best for batch index creation,
     * and smaller values (< 10) for indices that are interactively maintained.
     *
     * Default value is 10
     *
     * @param integer $maxMergeDocs
     */
    public function setMergeFactor($mergeFactor)
    {
        foreach ($this->_indices as $index) {
            $index->setMaxMergeDocs($mergeFactor);
        }
    }

    /**
     * Performs a query against the index and returns an array
     * of Zend_Search_Lucene_Search_QueryHit objects.
     * Input is a string or Zend_Search_Lucene_Search_Query.
     *
     * @param mixed $query
     * @return array Zend_Search_Lucene_Search_QueryHit
     * @throws Zend_Search_Lucene_Exception
     */
    public function find($query)
    {
        if (count($this->_indices) == 0) {
            return array();
        }

        $hitsList = array();

        $indexShift = 0;
        foreach ($this->_indices as $index) {
            $hits = $index->find($query);

            if ($indexShift != 0) {
                foreach ($hits as $hit) {
                    $hit->id += $indexShift;
                }
            }

            $indexShift += $index->count();
            $hitsList[] = $hits;
        }

        /** @todo Implement advanced sorting */

        return call_user_func_array('array_merge', $hitsList);
    }

    /**
     * Returns a list of all unique field names that exist in this index.
     *
     * @param boolean $indexed
     * @return array
     */
    public function getFieldNames($indexed = false)
    {
        $fieldNamesList = array();

        foreach ($this->_indices as $index) {
            $fieldNamesList[] = $index->getFieldNames($indexed);
        }

        return array_unique(call_user_func_array('array_merge', $fieldNamesList));
    }

    /**
     * Returns a Zend_Search_Lucene_Document object for the document
     * number $id in this index.
     *
     * @param integer|Zend_Search_Lucene_Search_QueryHit $id
     * @return Zend_Search_Lucene_Document
     * @throws Zend_Search_Lucene_Exception    Exception is thrown if $id is out of the range
     */
    public function getDocument($id)
    {
        if ($id instanceof Zend_Search_Lucene_Search_QueryHit) {
            /* @var $id Zend_Search_Lucene_Search_QueryHit */
            $id = $id->id;
        }

        foreach ($this->_indices as $index) {
            $indexCount = $index->count();

            if ($indexCount > $id) {
                return $index->getDocument($id);
            }

            $id -= $indexCount;
        }

        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
    }

    /**
     * Returns true if index contain documents with specified term.
     *
     * Is used for query optimization.
     *
     * @param Zend_Search_Lucene_Index_Term $term
     * @return boolean
     */
    public function hasTerm(Zend_Search_Lucene_Index_Term $term)
    {
        foreach ($this->_indices as $index) {
            if ($index->hasTerm($term)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Returns IDs of all the documents containing term.
     *
     * @param Zend_Search_Lucene_Index_Term $term
     * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
     * @return array
     * @throws Zend_Search_Lucene_Exception
     */
    public function termDocs(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
    {
        if ($docsFilter != null) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
        }

        $docsList = array();

        $indexShift = 0;
        foreach ($this->_indices as $index) {
            $docs = $index->termDocs($term);

            if ($indexShift != 0) {
                foreach ($docs as $id => $docId) {
                    $docs[$id] += $indexShift;
                }
            }

            $indexShift += $index->count();
            $docsList[] = $docs;
        }

        return call_user_func_array('array_merge', $docsList);
    }

    /**
     * Returns documents filter for all documents containing term.
     *
     * It performs the same operation as termDocs, but return result as
     * Zend_Search_Lucene_Index_DocsFilter object
     *
     * @param Zend_Search_Lucene_Index_Term $term
     * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
     * @return Zend_Search_Lucene_Index_DocsFilter
     * @throws Zend_Search_Lucene_Exception
     */
    public function termDocsFilter(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
    {
        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
    }

    /**
     * Returns an array of all term freqs.
     * Return array structure: array( docId => freq, ...)
     *
     * @param Zend_Search_Lucene_Index_Term $term
     * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
     * @return integer
     * @throws Zend_Search_Lucene_Exception
     */
    public function termFreqs(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
    {
        if ($docsFilter != null) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
        }

        $freqsList = array();

        $indexShift = 0;
        foreach ($this->_indices as $index) {
            $freqs = $index->termFreqs($term);

            if ($indexShift != 0) {
                $freqsShifted = array();

                foreach ($freqs as $docId => $freq) {
                    $freqsShifted[$docId + $indexShift] = $freq;
                }
                $freqs = $freqsShifted;
            }

            $indexShift += $index->count();
            $freqsList[] = $freqs;
        }

        return call_user_func_array('array_merge', $freqsList);
    }

    /**
     * Returns an array of all term positions in the documents.
     * Return array structure: array( docId => array( pos1, pos2, ...), ...)
     *
     * @param Zend_Search_Lucene_Index_Term $term
     * @param Zend_Search_Lucene_Index_DocsFilter|null $docsFilter
     * @return array
     * @throws Zend_Search_Lucene_Exception
     */
    public function termPositions(Zend_Search_Lucene_Index_Term $term, $docsFilter = null)
    {
        if ($docsFilter != null) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Document filters could not used with multi-searcher');
        }

        $termPositionsList = array();

        $indexShift = 0;
        foreach ($this->_indices as $index) {
            $termPositions = $index->termPositions($term);

            if ($indexShift != 0) {
                $termPositionsShifted = array();

                foreach ($termPositions as $docId => $positions) {
                    $termPositions[$docId + $indexShift] = $positions;
                }
                $termPositions = $termPositionsShifted;
            }

            $indexShift += $index->count();
            $termPositionsList[] = $termPositions;
        }

        return call_user_func_array('array_merge', $termPositions);
    }

    /**
     * Returns the number of documents in this index containing the $term.
     *
     * @param Zend_Search_Lucene_Index_Term $term
     * @return integer
     */
    public function docFreq(Zend_Search_Lucene_Index_Term $term)
    {
        $docFreq = 0;

        foreach ($this->_indices as $index) {
            $docFreq += $index->docFreq($term);
        }

        return $docFreq;
    }

    /**
     * Retrive similarity used by index reader
     *
     * @return Zend_Search_Lucene_Search_Similarity
     * @throws Zend_Search_Lucene_Exception
     */
    public function getSimilarity()
    {
        if (count($this->_indices) == 0) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('Indices list is empty');
        }

        $similarity = reset($this->_indices)->getSimilarity();

        foreach ($this->_indices as $index) {
            if ($index->getSimilarity() !== $similarity) {
                require_once 'Zend/Search/Lucene/Exception.php';
                throw new Zend_Search_Lucene_Exception('Indices have different similarity.');
            }
        }

        return $similarity;
    }

    /**
     * Returns a normalization factor for "field, document" pair.
     *
     * @param integer $id
     * @param string $fieldName
     * @return float
     */
    public function norm($id, $fieldName)
    {
        foreach ($this->_indices as $index) {
            $indexCount = $index->count();

            if ($indexCount > $id) {
                return $index->norm($id, $fieldName);
            }

            $id -= $indexCount;
        }

        return null;
    }

    /**
     * Returns true if any documents have been deleted from this index.
     *
     * @return boolean
     */
    public function hasDeletions()
    {
        foreach ($this->_indices as $index) {
            if ($index->hasDeletions()) {
                return true;
            }
        }

        return false;
    }

    /**
     * Deletes a document from the index.
     * $id is an internal document id
     *
     * @param integer|Zend_Search_Lucene_Search_QueryHit $id
     * @throws Zend_Search_Lucene_Exception
     */
    public function delete($id)
    {
        foreach ($this->_indices as $index) {
            $indexCount = $index->count();

            if ($indexCount > $id) {
                $index->delete($id);
                return;
            }

            $id -= $indexCount;
        }

        require_once 'Zend/Search/Lucene/Exception.php';
        throw new Zend_Search_Lucene_Exception('Document id is out of the range.');
    }


    /**
     * Callback used to choose target index for new documents
     *
     * Function/method signature:
     *    Zend_Search_Lucene_Interface  callbackFunction(Zend_Search_Lucene_Document $document, array $indices);
     *
     * null means "default documents distributing algorithm"
     *
     * @var callback
     */
    protected $_documentDistributorCallBack = null;

    /**
     * Set callback for choosing target index.
     *
     * @param callback $callback
     * @throws Zend_Search_Lucene_Exception
     */
    public function setDocumentDistributorCallback($callback)
    {
        if ($callback !== null  &&  !is_callable($callback)) {
            require_once 'Zend/Search/Lucene/Exception.php';
            throw new Zend_Search_Lucene_Exception('$callback parameter must be a valid callback.');
        }

        $this->_documentDistributorCallBack = $callback;
    }

    /**
     * Get callback for choosing target index.
     *
     * @return callback
     */
    public function getDocumentDistributorCallback()
    {
        return $this->_documentDistributorCallBack;
    }

    /**
     * Adds a document to this index.
     *
     * @param Zend_Search_Lucene_Document $document
     * @throws Zend_Search_Lucene_Exception
     */
    public function addDocument(Zend_Search_Lucene_Document $document)
    {
        if ($this->_documentDistributorCallBack !== null) {
            $index = call_user_func($this->_documentDistributorCallBack, $document, $this->_indices);
        } else {
            $index = $this->_indices[array_rand($this->_indices)];
        }

        $index->addDocument($document);
    }

    /**
     * Commit changes resulting from delete() or undeleteAll() operations.
     */
    public function commit()
    {
        foreach ($this->_indices as $index) {
            $index->commit();
        }
    }

    /**
     * Optimize index.
     *
     * Merges all segments into one
     */
    public function optimize()
    {
        foreach ($this->_indices as $index) {
            $index->optimise();
        }
    }

    /**
     * Returns an array of all terms in this index.
     *
     * @return array
     */
    public function terms()
    {
        $termsList = array();

        foreach ($this->_indices as $index) {
            $termsList[] = $index->terms();
        }

        return array_unique(call_user_func_array('array_merge', $termsList));
    }


    /**
     * Terms stream priority queue object
     *
     * @var Zend_Search_Lucene_TermStreamsPriorityQueue
     */
    private $_termsStream = null;

    /**
     * Reset terms stream.
     */
    public function resetTermsStream()
    {
        if ($this->_termsStream === null) {
            /** Zend_Search_Lucene_TermStreamsPriorityQueue */
            require_once 'Zend/Search/Lucene/TermStreamsPriorityQueue.php';

            $this->_termsStream = new Zend_Search_Lucene_TermStreamsPriorityQueue($this->_indices);
        } else {
            $this->_termsStream->resetTermsStream();
        }
    }

    /**
     * Skip terms stream up to specified term preffix.
     *
     * Prefix contains fully specified field info and portion of searched term
     *
     * @param Zend_Search_Lucene_Index_Term $prefix
     */
    public function skipTo(Zend_Search_Lucene_Index_Term $prefix)
    {
        $this->_termsStream->skipTo($prefix);
    }

    /**
     * Scans terms dictionary and returns next term
     *
     * @return Zend_Search_Lucene_Index_Term|null
     */
    public function nextTerm()
    {
        return $this->_termsStream->nextTerm();
    }

    /**
     * Returns term in current position
     *
     * @return Zend_Search_Lucene_Index_Term|null
     */
    public function currentTerm()
    {
        return $this->_termsStream->currentTerm();
    }

    /**
     * Close terms stream
     *
     * Should be used for resources clean up if stream is not read up to the end
     */
    public function closeTermsStream()
    {
        $this->_termsStream->closeTermsStream();
        $this->_termsStream = null;
    }


    /**
     * Undeletes all documents currently marked as deleted in this index.
     */
    public function undeleteAll()
    {
        foreach ($this->_indices as $index) {
            $index->undeleteAll();
        }
    }


    /**
     * Add reference to the index object
     *
     * @internal
     */
    public function addReference()
    {
        // Do nothing, since it's never referenced by indices
    }

    /**
     * Remove reference from the index object
     *
     * When reference count becomes zero, index is closed and resources are cleaned up
     *
     * @internal
     */
    public function removeReference()
    {
        // Do nothing, since it's never referenced by indices
    }
}
Back to Top