| 1 | <?php
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| 2 |
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| 3 | // ----------------------------------------------------------------------------------
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| 4 | // Class: IterFind
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| 5 | // ----------------------------------------------------------------------------------
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| 6 |
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| 7 |
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| 8 | /**
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| 9 | * Implementation of a find-iterator which delivers statements or quads.
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| 10 | *
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| 11 | * This Iterator should be used in a for-loop like:
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| 12 | * for($iterator = $memmodel->iterFind(null,null,null,null); $iterator->valid(); $iterator->next())
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| 13 | * {
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| 14 | * $statement=$iterator->current();
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| 15 | * };
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| 16 | *
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| 17 | * @version $Id$
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| 18 | * @author Daniel Westphal (http://www.d-westphal.de)
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| 19 | *
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| 20 | *
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| 21 | * @package utility
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| 22 | * @access public
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| 23 | **/
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| 24 | class IterFind
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| 25 | {
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| 26 |
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| 27 | /**
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| 28 | * The current position
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| 29 | * @var integer
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| 30 | * @access private
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| 31 | */
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| 32 | var $key;
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| 33 |
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| 34 | /**
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| 35 | * boolean value, if the results should be returned as Quads
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| 36 | * @var boolean
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| 37 | * @access private
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| 38 | */
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| 39 | var $returnAsQuads;
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| 40 |
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| 41 | /**
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| 42 | * If the current resource is valid
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| 43 | * @var boolean
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| 44 | * @access private
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| 45 | */
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| 46 | var $valid;
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| 47 |
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| 48 | /**
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| 49 | * The current NamedGraph
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| 50 | * @var obejct NamedGraph
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| 51 | * @access private
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| 52 | */
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| 53 | var $current;
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| 54 |
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| 55 | /**
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| 56 | * The graph to look in.
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| 57 | * @var string
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| 58 | * @access private
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| 59 | */
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| 60 | var $findGraph;
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| 61 |
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| 62 | /**
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| 63 | * The subject Resource to search for
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| 64 | * @var string
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| 65 | * @access private
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| 66 | */
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| 67 | var $findSubject;
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| 68 |
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| 69 | /**
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| 70 | * The predicate Resource to search for
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| 71 | * @var string
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| 72 | * @access private
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| 73 | */
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| 74 | var $findPredicate;
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| 75 |
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| 76 | /**
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| 77 | * The object Resource to search for
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| 78 | * @var string
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| 79 | * @access private
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| 80 | */
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| 81 | var $findObject;
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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 | * Constructor.
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| 87 | *
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| 88 | * $subject, $predicate, and $object are used like find().
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| 89 | * $graph has to be a reference to the graph to search in.
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| 90 | *
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| 91 | *
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| 92 | *
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| 93 | * @param $graph Resource
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| 94 | * @param $subject Resource
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| 95 | * @param $predicate Resource
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| 96 | * @param $object Resource
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| 97 | * @param $returnAsQuads boolean
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| 98 | * @access public
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| 99 | */
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| 100 | function IterFind($graph,$subject,$predicate,$object,$returnAsQuads=false)
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| 101 | {
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| 102 | if ($graph==NULL)
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| 103 | {
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| 104 | $this->valid=false;
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| 105 | return;
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| 106 | }
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| 107 | $this->findGraph=&$graph;
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| 108 | $this->findSubject=$subject;
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| 109 | $this->findPredicate=$predicate;
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| 110 | $this->findObject=$object;
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| 111 | $this->rewind();
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| 112 | $this->returnAsQuads=$returnAsQuads;
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| 113 | }
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| 114 |
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| 115 | /**
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| 116 | * Resets iterator list to start
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| 117 | *
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| 118 | * @access public
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| 119 | */
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| 120 | function rewind()
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| 121 | {
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| 122 | $this->key = -1;
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| 123 | $this->next();
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| 124 | }
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| 125 |
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| 126 | /**
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| 127 | * Says if there are additional items left in the list
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| 128 | *
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| 129 | * @return boolean
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| 130 | * @access public
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| 131 | */
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| 132 | function valid()
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| 133 | {
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| 134 | return $this->valid;
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| 135 | }
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| 136 |
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| 137 | /**
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| 138 | * Moves Iterator to the next item in the list
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| 139 | *
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| 140 | * @access public
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| 141 | */
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| 142 | function next()
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| 143 | {
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| 144 | $this->current = $this->findGraph->findFirstMatchingStatement($this->findSubject,$this->findPredicate,$this->findObject,++$this->key);
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| 145 | $this->valid=($this->current!=NULL);
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| 146 | }
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| 147 |
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| 148 | /**
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| 149 | * Returns the current item
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| 150 | *
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| 151 | * @return mixed
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| 152 | * @access public
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| 153 | */
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| 154 | function current()
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| 155 | {
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| 156 | if($this->returnAsQuads)
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| 157 | return new Quad(new Resource($this->findGraph->getGraphName()),$this->current->getSubject(),$this->current->getPredicate(),$this->current->getObject());
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| 158 | //else
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| 159 | return $this->current;
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| 160 | }
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| 161 |
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| 162 |
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| 163 | /**
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| 164 | * Returns the key of the current item
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| 165 | *
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| 166 | * @return integer
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| 167 | * @access public
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| 168 | */
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| 169 | function key()
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| 170 | {
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| 171 | return $this->key;
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| 172 | }
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| 173 | }
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| 174 | ?> |
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