RdfClass.php

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<?php
include_once("Namespaces.php");


class RdfClass
{
  /* Data structure of $triples looks like:
  
    Array
    (
      [/ontologies/inferred/] => Array
        (
          [http://www.w3.org/2002/07/owl#equivalentClasses] => Array
            (
              [0] => http://purl.org/dc/terms/Agent
            )
    
        )
    )
  */

  public $triples = array();

  private $uri = "";

  private $ontologiesGraph = "";

  function __construct($classURI, $ontologiesGraph, $inferredOntologiesGraph, &$db)
  {
    $this->uri = $classURI;
    $this->ontologiesGraph = $ontologiesGraph;

    $query =
      $db->build_sparql_query(
        "select ?g ?p ?o from named <$this->ontologiesGraph> from named <$inferredOntologiesGraph> where {graph ?g{<$classURI> ?p ?o.}}",
        array ('g', 'p', 'o'), FALSE);

    $resultset = $db->query($query);

    while(odbc_fetch_row($resultset))
    {
      $g = odbc_result($resultset, 1);
      $p = odbc_result($resultset, 2);
      $o = odbc_result($resultset, 3);

      if(!isset($this->triples[$g]))
      {
        $this->triples[$g] = array();
      }

      if(!isset($this->triples[$g][$p]))
      {
        $this->triples[$g][$p] = array();
      }

      array_push($this->triples[$g][$p], $o);
    }
  }

  function __destruct() { }

  public function getLabel()
  {
    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$iron . "prefLabel"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$iron . "prefLabel"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$skos_2008 . "prefLabel"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$skos_2008 . "prefLabel"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$skos_2004 . "prefLabel"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$skos_2004 . "prefLabel"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$rdfs . "label"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$rdfs . "label"][0];
    }

    // Find the base URI of the ontology
    $pos = strripos($this->uri, "#");

    if($pos === FALSE)
    {
      $pos = strripos($this->uri, "/");
    }

    if($pos !== FALSE)
    {
      $pos++;
    }

    $resource = substr($this->uri, $pos, strlen($this->uri) - $pos);

    return $resource;
  }

  public function getDescription()
  {
    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$iron . "description"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$iron . "description"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$skos_2008 . "definition"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$skos_2008 . "definition"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$skos_2004 . "definition"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$skos_2004 . "definition"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$rdfs . "comment"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$rdfs . "comment"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$dcterms . "description"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$dcterms . "description"][0];
    }

    if(isset($this->triples[$this->ontologiesGraph][Namespaces::$dc . "description"]))
    {
      return $this->triples[$this->ontologiesGraph][Namespaces::$dc . "description"][0];
    }

    return "No description available";
  }
}


?>