Last change
on this file since 75 was
12,
checked in by basvannuland, 14 years ago
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Added RAP RDF API
Added RDF reader writer for save and load survey
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File size:
2.1 KB
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Rev | Line | |
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[12] | 1 | <?php
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| 2 | // ----------------------------------------------------------------------------------
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| 3 | // Class: IteratorAllGraphsMem
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| 4 | // ----------------------------------------------------------------------------------
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| 5 |
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| 6 |
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| 7 | /**
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| 8 | * Implementation of a Graph iterator.
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| 9 | *
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| 10 | * This Iterator should be used in a for-loop like:
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| 11 | * for($iterator = $dataset->listGraphs(); $iterator->valid(); $iterator->next())
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| 12 | * {
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| 13 | * $currentResource=$it->current();
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| 14 | * };
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| 15 | *
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| 16 | * @version $Id$
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| 17 | * @author Daniel Westphal <mail at d-westphal dot de>
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| 18 | *
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| 19 | *
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| 20 | * @package dataset
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| 21 | * @access public
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| 22 | **/
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| 23 | class IteratorAllGraphsMem
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| 24 | {
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| 25 | /**
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| 26 | * Holds a reference to the associated RDF dataset
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| 27 | *
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| 28 | * @var object dataset
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| 29 | * @access private
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| 30 | */
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| 31 | var $associatedGraphSet;
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| 32 |
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| 33 | /**
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| 34 | * The current position
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| 35 | *
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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 $key;
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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 | *
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| 44 | * @var boolean
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| 45 | * @access private
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| 46 | */
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| 47 | var $valid;
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| 48 |
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| 49 | /**
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| 50 | * The current NamedGraph
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| 51 | *
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| 52 | * @var obejct NamedGraph
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| 53 | * @access private
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| 54 | */
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| 55 | var $current;
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| 56 |
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| 57 |
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| 58 | /**
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| 59 | * Constructor.
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| 60 | *
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| 61 | * @param dataset
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| 62 | * @access public
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| 63 | */
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| 64 | function IteratorAllGraphsMem(&$namedGraphSet)
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| 65 | {
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| 66 | $this->associatedGraphSet=&$namedGraphSet;
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| 67 | $this->rewind();
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| 68 | }
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| 69 |
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| 70 | /**
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| 71 | * Resets iterator list to start
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| 72 | *
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| 73 | * @access public
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| 74 | */
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| 75 | function rewind()
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| 76 | {
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| 77 | $this->key = -1;
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| 78 | $this->next();
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| 79 | }
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| 80 |
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| 81 | /**
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| 82 | * Says if there are additional items left in the list.
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| 83 | *
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| 84 | * @return boolean
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| 85 | * @access public
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| 86 | */
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| 87 | function valid()
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| 88 | {
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| 89 | return $this->valid;
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| 90 | }
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| 91 |
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| 92 | /**
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| 93 | * Moves Iterator to the next item in the list.
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| 94 | *
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| 95 | * @access public
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| 96 | */
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| 97 | function next()
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| 98 | {
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| 99 | $this->current = &$this->associatedGraphSet->getGraphWithOffset(++$this->key);
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| 100 | $this->valid=($this->current!=NULL);
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| 101 | }
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| 102 |
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| 103 | /**
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| 104 | * Returns the current item.
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| 105 | *
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| 106 | * @return mixed
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| 107 | * @access public
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| 108 | */
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| 109 | function ¤t()
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| 110 | {
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| 111 | return $this->current;
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| 112 | }
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| 113 |
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| 114 | /**
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| 115 | * Returns the key of the current item.
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| 116 | *
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| 117 | * @return integer
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| 118 | * @access public
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| 119 | */
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| 120 | function key()
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| 121 | {
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| 122 | return $this->key;
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| 123 | }
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| 124 | }
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| 125 | ?> |
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