| 1 | <?php
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| 2 | require_once RDFAPI_INCLUDE_DIR . 'model/Resource.php';
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| 3 |
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| 4 | // ----------------------------------------------------------------------------------
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| 5 | // Class: BlankNode
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| 6 | // ----------------------------------------------------------------------------------
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| 7 |
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| 8 |
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| 9 | /**
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| 10 | * An RDF blank node.
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| 11 | * In model theory, blank nodes are considered to be drawn from some set of
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| 12 | * 'anonymous' entities which have no label but are unique to the graph.
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| 13 | * For serialization they are labeled with a URI or a _:X identifier.
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| 14 | *
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| 15 | *
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| 16 | * @version $Id: Blanknode.php 453 2007-06-20 21:19:09Z cweiske $
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| 17 | * @authors Chris Bizer <chris@bizer.de>,
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| 18 | * Radoslaw Oldakowski <radol@gmx.de>
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| 19 | *
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| 20 | * @package model
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| 21 | * @access public
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| 22 | *
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| 23 | */
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| 24 | class BlankNode extends Resource {
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| 25 |
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| 26 | /**
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| 27 | * Constructor
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| 28 | * You can supply a label or You supply a model and a unique ID is gernerated.
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| 29 | *
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| 30 | * @param mixed $namespace_or_uri_or_model
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| 31 | * @param string $localName
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| 32 | * @access public
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| 33 | */
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| 34 | function BlankNode($namespace_or_uri_or_model , $localName = NULL) {
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| 35 |
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| 36 | if (is_a($namespace_or_uri_or_model, 'Model')) {
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| 37 | // generate identifier
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| 38 | $id = $namespace_or_uri_or_model->getUniqueResourceURI(BNODE_PREFIX);
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| 39 |
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| 40 | $this->uri = $id;
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| 41 |
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| 42 | } else {
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| 43 | // set identifier
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| 44 | if ($localName == NULL) {
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| 45 | $this->uri = $namespace_or_uri_or_model;
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| 46 | } else {
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| 47 | $this->uri = $namespace_or_uri_or_model . $localName;
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | /**
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| 53 | * Returns the ID of the blank node.
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| 54 | *
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| 55 | * @return string
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| 56 | * @access public
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| 57 | */
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| 58 | function getID() {
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| 59 | return $this->uri;
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| 60 | }
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| 61 |
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| 62 | /**
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| 63 | * Returns the ID of the blank node.
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| 64 | *
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| 65 | * @return string
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| 66 | * @access public
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| 67 | */
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| 68 | function getLabel() {
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| 69 | return $this->uri;
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| 70 | }
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| 71 |
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| 72 | /**
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| 73 | * Dumps bNode.
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| 74 | *
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| 75 | * @access public
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| 76 | * @return string
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| 77 | */
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| 78 | function toString() {
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| 79 |
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| 80 | return 'bNode("' . $this->uri . '")';
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| 81 | }
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| 82 |
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| 83 | /**
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| 84 | * Checks if two blank nodes are equal.
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| 85 | * Two blank nodes are equal, if they have the same temporary ID.
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| 86 | *
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| 87 | * @access public
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| 88 | * @param object resource $that
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| 89 | * @return boolean
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| 90 | */
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| 91 | function equals ($that) {
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| 92 |
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| 93 | if ($this == $that) {
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| 94 | return true;
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| 95 | }
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| 96 | if (($that == NULL) or !(is_a($that, 'BlankNode'))) {
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| 97 | return false;
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| 98 | }
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| 99 |
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| 100 | if ($this->getURI() == $that->getURI()) {
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| 101 | return true;
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| 102 | }
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| 103 |
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| 104 | return false;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | /**
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| 109 | * Doing string magic in PHP5
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| 110 | * @return string String representation of this Blank Node
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| 111 | */
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| 112 | function __toString()
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| 113 | {
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| 114 | return $this->toString();
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| 115 | }
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| 116 |
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| 117 | } // end: BlankNode
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| 118 |
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| 119 |
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| 120 | ?> |
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