| [12] | 1 | <?php
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| 2 |
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| 3 | // ----------------------------------------------------------------------------------
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| 4 | // Class: ModelComparator
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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 | * This class compares to models. This comparator bases on the labelling algorithm
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| 10 | * described in <href="http://www.hpl.hp.com/techreports/2003/HPL-2003-142.pdf" >Signing RDF Graphs</href>
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| 11 | * by Jeremy J. Carroll.
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| 12 | *
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| 13 | *
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| 14 | * @version $Id$
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| 15 | * @author Tobias Gauß <tobias.gauss at 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 ModelComparator extends Object {
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| 22 |
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| 23 | /**
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| 24 | * Compares two models.
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| 25 | *
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| 26 | * @param $thisModel First Model.
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| 27 | * @param $thatModel Second Model.
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| 28 | *
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| 29 | * @return boolean
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| 30 | */
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| 31 | function compare($thisModel, $thatModel){
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| 32 |
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| 33 | $thisModeltriples = null;
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| 34 | $thatModeltriples = null;
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| 35 |
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| 36 | if(is_a($thisModel,"DbModel")){
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| 37 | $thisModeltriples = $thisModel->getMemModel();
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| 38 | }else{
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| 39 | $thisModeltriples = $thisModel;
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| 40 | }
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| 41 |
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| 42 | if(is_a($thatModel,"DbModel")){
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| 43 | $thatModeltriples = $thatModel->getMemModel();
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| 44 | }else{
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| 45 | $thatModeltriples = $thatModel;
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| 46 | }
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| 47 |
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| 48 | $sortArray1 = ModelComparator::buildSortArray($thisModeltriples->triples);
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| 49 | $sortArray2 = ModelComparator::buildSortArray($thatModeltriples->triples);
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| 50 |
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| 51 | $renamedArray1 = ModelComparator::renameBlanks($sortArray1);
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| 52 | $renamedArray2 = ModelComparator::renameBlanks($sortArray2);
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| 53 |
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| 54 | return ModelComparator::compareTriples($renamedArray1,$renamedArray2);
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| 55 | }
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| 56 |
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| 57 |
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| 58 | /**
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| 59 | * Builds a sorted array.
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| 60 | *
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| 61 | * @param $tripleList A List that contains the models triples.
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| 62 | *
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| 63 | * @return Array
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| 64 | */
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| 65 | function buildSortArray($tripleList){
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| 66 | $sortedArray = Array();
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| 67 |
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| 68 | foreach($tripleList as $index => $triple){
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| 69 | $sub = null;
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| 70 | $obj = null;
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| 71 | $orgSub = $triple->getSubject();
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| 72 | $orgObj = $triple->getObject();
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| 73 |
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| 74 | if(is_a($orgSub,"Blanknode")){
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| 75 | $sub = $orgSub->getID();
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| 76 | $triple->subj = new Blanknode("~");
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| 77 | }
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| 78 | if(is_a($orgObj,"Blanknode")){
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| 79 | $obj = $orgObj->getID();
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| 80 | $triple->obj = new Blanknode("~");
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| 81 | }
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| 82 | $sortedArray[$index]['string'] = $triple->toString();
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| 83 | $sortedArray[$index]['index'] = $index;
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| 84 | $sortedArray[$index]['triple'] = $triple;
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| 85 | $sortedArray[$index]['sub'] = $sub;
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| 86 | $sortedArray[$index]['obj'] = $obj;
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| 87 | }
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| 88 | sort($sortedArray);
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| 89 | return $sortedArray;
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| 90 | }
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| 91 |
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| 92 | /**
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| 93 | * Renames the models Blanknodes.
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| 94 | *
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| 95 | * @param $sortedArray A List that contains the models triples.
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| 96 | *
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| 97 | * @return Array
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| 98 | */
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| 99 | function renameBlanks($sortedArray){
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| 100 | $i = 0;
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| 101 | $labelmap = Array();
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| 102 |
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| 103 | foreach ($sortedArray as $value){
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| 104 | //new label
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| 105 | if($value['sub']!=null){
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| 106 | $label = null;
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| 107 | if(isset($labelmap[$value['sub']])){
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| 108 | $label = $labelmap[$value['sub']];
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| 109 | $value['triple']->subj = new BlankNode($labelmap[$value['sub']]);
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| 110 | }else{
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| 111 | $label = $i."Bnode";
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| 112 | $labelmap[$value['sub']]=$label;
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| 113 | $value['triple']->subj = new BlankNode($labelmap[$value['sub']]);
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| 114 | $i++;
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| 115 | }
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| 116 | }
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| 117 |
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| 118 | if($value['obj']!=null){
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| 119 | $label = null;
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| 120 | if(isset($labelmap[$value['obj']])){
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| 121 | $label = $labelmap[$value['obj']];
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| 122 | $value['triple']->obj = new BlankNode($labelmap[$value['obj']]);
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| 123 | }else{
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| 124 | $label = $i."Bnode";
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| 125 | $labelmap[$value['obj']]=$label;
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| 126 | $value['triple']->obj = new BlankNode($labelmap[$value['obj']]);
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| 127 | $i++;
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| 128 | }
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| 129 | }
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| 130 |
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| 131 | }
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| 132 | return $sortedArray;
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| 133 |
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| 134 | }
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| 135 |
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| 136 | /**
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| 137 | * Compares the Triples in the lists.
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| 138 | *
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| 139 | * @param $tripleList A List that contains the models triples.
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| 140 | * @param $tripleList A List that contains the models triples.
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| 141 | *
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| 142 | * @return boolean
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| 143 | */
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| 144 | function compareTriples($array1, $array2){
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| 145 | foreach($array1 as $key => $value){
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| 146 | if(!$value['triple']->equals($array2[$key]['triple']))
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| 147 | return false;
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| 148 | }
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| 149 | return true;
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| 150 |
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| 151 | }
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| 152 |
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| 153 |
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| 154 | }
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| 155 |
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| 156 |
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| 157 |
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| 158 | ?> |
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