| [12] | 1 | <?php
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| 2 |
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| 3 | // ----------------------------------------------------------------------------------
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| 4 | // Class: FindIterator
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| 5 | // ----------------------------------------------------------------------------------
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| 6 |
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| 7 | /**
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| 8 | * Iterator for traversing statements matching a searchpattern.
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| 9 | * FindIterators are returned by model->findAsIterator()
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| 10 | * Using a find iterator is significantly faster than using model->find() which returns
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| 11 | * a new result model.
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| 12 | *
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| 13 | *
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| 14 | * @version $Id: FindIterator.php 268 2006-05-15 05:28:09Z tgauss $
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| 15 | * @author Tobias Gauß <tobias.gauss@web.de>
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| 16 | *
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| 17 | * @package utility
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| 18 | * @access public
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| 19 | *
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| 20 | */
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| 21 | class FindIterator extends Object {
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| 22 |
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| 23 | /**
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| 24 | * Reference to the MemModel
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| 25 | * @var object MemModel
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| 26 | * @access private
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| 27 | */
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| 28 | var $model;
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| 29 |
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| 30 |
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| 31 |
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| 32 | /**
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| 33 | * Current position
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| 34 | * FindIterator does not use the build in PHP array iterator,
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| 35 | * so you can use serveral iterators on a single MemModel.
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| 36 | * @var integer
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| 37 | * @access private
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| 38 | */
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| 39 | var $position;
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| 40 |
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| 41 |
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| 42 | /**
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| 43 | * Searchpattern
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| 44 | *
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| 45 | * @var Object Subject,Predicate,Object
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| 46 | * @access private
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| 47 | */
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| 48 |
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| 49 | var $subject;
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| 50 | var $predicate;
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| 51 | var $object;
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| 52 |
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| 53 |
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| 54 | /**
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| 55 | * Constructor
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| 56 | *
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| 57 | * @param object MemModel
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| 58 | * @param object Subject
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| 59 | * @param object Predicate
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| 60 | * @param object Object
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| 61 | * @access public
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| 62 | */
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| 63 | function FindIterator(&$model,$sub,$pred,$obj) {
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| 64 | $this->model = &$model;
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| 65 | $this->subject=$sub;
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| 66 | $this->predicate=$pred;
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| 67 | $this->object=$obj;
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| 68 | $this->position=-1;
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| 69 | }
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| 70 |
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| 71 |
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| 72 | /**
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| 73 | * Returns TRUE if there are more matching statements.
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| 74 | * @return boolean
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| 75 | * @access public
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| 76 | */
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| 77 | function hasNext() {
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| 78 | if($this->model->findFirstMatchOff($this->subject,$this->predicate,$this->object,$this->position+1)>-1){
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| 79 | return TRUE;
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| 80 | }else{
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| 81 | return FALSE;
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| 82 | }
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| 83 | }
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| 84 |
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| 85 |
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| 86 | /**
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| 87 | * Returns the next matching statement.
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| 88 | * @return statement or NULL if there is no next matching statement.
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| 89 | * @access public
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| 90 | */
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| 91 | function next() {
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| 92 | $res=$this->model->findFirstMatchOff($this->subject,$this->predicate,$this->object,$this->position+1);
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| 93 | if($res>-1){
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| 94 | $this->position=$res;
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| 95 | return $this->model->triples[$res];
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| 96 | }else{
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| 97 | return Null;
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| 98 | }
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| 99 | }
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| 100 |
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| 101 |
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| 102 |
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| 103 |
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| 104 | /**
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| 105 | * Returns the current matching statement.
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| 106 | * @return statement or NULL if there is no current matching statement.
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| 107 | * @access public
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| 108 | */
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| 109 | function current() {
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| 110 | if (($this->position >= -1)&&(isset($this->model->triples[$this->position]))) {
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| 111 | return $this->model->triples[$this->position];
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| 112 | } else {
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| 113 | return NULL;
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| 114 | }
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| 115 | }
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| 116 |
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| 117 | }
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| 118 |
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| 119 | ?> |
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