| 1 | <?php
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| 2 | // ----------------------------------------------------------------------------------
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| 3 | // Class: Quad
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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 | * A Triple in a RDF dataset, consisting of four Jena Nodes: graphName,
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| 9 | * subject, predicate, and object.
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| 10 | *
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| 11 | * @version $Id$
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| 12 | * @author Daniel Westphal (http://www.d-westphal.de)
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| 13 | *
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| 14 | * @package dataset
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| 15 | * @access public
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| 16 | **/
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| 17 | class Quad
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| 18 | {
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| 19 |
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| 20 | /**
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| 21 | * Name of the NamedGraphMem.
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| 22 | *
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| 23 | * @var Resource
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| 24 | * @access private
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| 25 | */
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| 26 | var $graphName;
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| 27 |
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| 28 | /**
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| 29 | * Statement
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| 30 | *
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| 31 | * @var Statement
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| 32 | * @access private
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| 33 | */
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| 34 | var $statement;
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| 35 |
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| 36 | /**
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| 37 | * Constructor
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| 38 | * Creates a Quad from four Nodes.
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| 39 | *
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| 40 | * @param Resource
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| 41 | * @param Resource
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| 42 | * @param Resource
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| 43 | * @param Resource
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| 44 | * @access public
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| 45 | */
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| 46 | function Quad($graphName,$subject,$predicate,$object)
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| 47 | {
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| 48 | if (!is_a($graphName, 'Resource'))
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| 49 | {
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| 50 | $errmsg = RDFAPI_ERROR .
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| 51 | '(class: Quad; method: new): Resource expected as graphName.';
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| 52 | trigger_error($errmsg, E_USER_ERROR);
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| 53 | }
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| 54 | $this->statement=new Statement($subject,$predicate,$object);
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| 55 | $this->graphName=$graphName;
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| 56 | }
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| 57 |
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| 58 | /**
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| 59 | * Sets the graph name.
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| 60 | *
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| 61 | * @param Resource
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| 62 | * @access public
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| 63 | */
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| 64 | function setGraphName($graphName)
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| 65 | {
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| 66 | $this->graphName=$graphName;
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| 67 | }
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| 68 |
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| 69 | /**
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| 70 | * Returns the graph name.
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| 71 | *
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| 72 | * @return Resource
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| 73 | * @access public
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| 74 | */
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| 75 | function getGraphName()
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| 76 | {
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| 77 | return $this->graphName;
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| 78 | }
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| 79 |
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| 80 | /**
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| 81 | * Return a human-readable (sort of) string "graphname { s p o . }"
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| 82 | * describing the quad.
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| 83 | *
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| 84 | * @return string
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| 85 | */
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| 86 | function toString()
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| 87 | {
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| 88 | return 'GraphName('.$this->graphName->getLabel().') '.$this->statement->toString();
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * Returns the subject.
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| 93 | *
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| 94 | * @return Resource
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| 95 | * @access public
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| 96 | */
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| 97 | function getSubject()
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| 98 | {
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| 99 | return $this->statement->getSubject();
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| 100 | }
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| 101 |
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| 102 | /**
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| 103 | * Returns the predicate.
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| 104 | *
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| 105 | * @return Resource
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| 106 | * @access public
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| 107 | */
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| 108 | function getPredicate()
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| 109 | {
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| 110 | return $this->statement->getPredicate();
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| 111 | }
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| 112 |
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| 113 | /**
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| 114 | * Returns the object.
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| 115 | *
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| 116 | * @return Resource
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| 117 | * @access public
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| 118 | */
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| 119 | function getObject()
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| 120 | {
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| 121 | return $this->statement->getObject();
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| 122 | }
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| 123 |
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| 124 | /**
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| 125 | * Returns the statement(subject,predicate,object).
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| 126 | *
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| 127 | * @return statement
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| 128 | * @access public
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| 129 | */
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| 130 | function getStatement()
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| 131 | {
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| 132 | return $this->statement;
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| 133 | }
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| 134 |
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| 135 | /**
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| 136 | * Checks if two quads are equal.
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| 137 | *
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| 138 | * @param Quad
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| 139 | * @return boolean
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| 140 | * @access public
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| 141 | */
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| 142 | function equals($quad)
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| 143 | {
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| 144 | return ($this->graphName->equals($quad->getGraphName()) && $this->statement->equals($quad->getStatement()));
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| 145 | }
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| 146 | }
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| 147 | ?> |
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