source: Dev/trunk/rdfapi/ontModel/OntResource.php @ 12

<?php 
// ----------------------------------------------------------------------------------
// Class: OntResource
// ----------------------------------------------------------------------------------


/**
* Provides a common super-type for all of the abstractions in 
* this ontology representation package.
*
* @version  $Id: OntResource.php 268 2006-05-15 05:28:09Z tgauss $
* @author Daniel Westphal <mail at d-westphal dot de>
*
*
* @package      ontModel
* @access       public
**/
class OntResource extends ResResource 
{
        /**
        * Holds a reference to the assoiated vocabulary
        * @var          object
        * @access       private
        */
        var $vocabulary;
        
        /**
        * Holds a resResource of the type, which is this ontResource of.
        * If this value is set, the ontModel will add an additional 
    * statement about this resource and the fiven rdf:type
        * @var          object
        * @access       private
        */
        var $rdfType;
        
        
        /**
    * Constructor
        * You can supply a uri
    *
    * @param string $uri 
        * @access       public
    */
        function OntResource($uri = null)
        {
                $this->rdfType=false;
                parent::ResResource($uri);
        }
        
        /**
        * Sets the reference to the assoiated vocabulary
        *
        * @param        object OntVocabulary    $vocabulary
        * @access       public
        */
        function setVocabulary(& $vocabulary)
        {
                $this->vocabulary = & $vocabulary;
        }
        
        /**
        * Add the given comment to this resource.
        *
        * @param        object ResLiteral       $comment
        * @return       boolean 
        * @access       public
        */
        function addComment($comment)
        {
                return $this->addProperty($this->vocabulary->COMMENT(),$comment);
        }
        
        /**
        * Answer the comment string for this object. If there is more than one such resource, an arbitrary selection is made.
        *
        * @return       object ResLiteral or NULL 
        * @access       public
        */
        function getComment()
        {
                return $this->getPropertyValue($this->vocabulary->COMMENT());
        }
        
        /**
        * Add a resource that is declared to provide a definition of this resource.
        *
        * @param        object ResResource      $resResource
        * @return       boolean 
        * @access       public
        */
        function addIsDefinedBy($resResource)
        {
                return $this->addProperty($this->vocabulary->IS_DEFINED_BY(),$resResource);
        }
        
        /**
        * Answer a resource that is declared to provide a definition of this resource. 
        * If there is more than one such resource, an arbitrary selection is made.
        *
        * @return       object ResResource 
        * @access       public
        */
        function getIsDefinedBy()
        {
                return $this->getPropertyValue($this->vocabulary->IS_DEFINED_BY());
        }
        
        /**
        * Add the given Label to this resource
        *
        * @param        object ResLiteral       $resLiteral
        * @return       boolean 
        * @access       public
        */
        function addLabelProperty($resLiteral)
        {
                return $this->addProperty($this->vocabulary->LABEL(),$resLiteral);
        }
        
        /**
        * Answer the label ResLiteral for this object. 
        * If there is more than one such resource, an arbitrary selection is made.
        *
        * @param        string  $uri
        * @return       object ResResource
        * @access       public
        */
        function getLabelProperty()
        {
                return $this->getPropertyValue($this->vocabulary->LABEL());
        }
        
        /**
        * Add the given class as one of the rdf:type's for this resource.
        *
        * @param        object ResResource      $resResource
        * @return       boolean 
        * @access       public
        */
        function addRDFType($resResource)
        {
                return $this->addProperty($this->vocabulary->TYPE(),$resResource);
        }
        
        /**
        * Answer the rdf:type (ie the class) of this resource. 
        * If there is more than one type for this resource, the return value will 
        * be one of the values, but it is not specified which one 
        * (nor that it will consistently be the same one each time).
        *
        * @return       object ResResource 
        * @access       public
        */
        function getRDFType()
        {
                return $this->getPropertyValue($this->vocabulary->TYPE());
        }
        
        /**
        * Add a resource that is declared to provided additional 
        * information about the definition of this resource.
        *
        * @param        object ResResource      $resResource
        * @return       boolean 
        * @access       public
        */
        function addSeeAlso($resResource)
        {
                return $this->addProperty($this->vocabulary->SEE_ALSO(),$resResource);
        }
        
        /**
        * Answer a resource that provides additional information about this resource. 
        * If more than one such resource is defined, make an arbitrary choice.
        *
        * @return       object ResResource 
        * @access       public
        */
        function getSeeAlso()
        {
                return $this->getPropertyValue($this->vocabulary->SEE_ALSO());
        }
        
        /**
        * Answer a view of this resource as a class
        *
        * @return       object OntClass 
        * @access       public
        */
        function asClass()
        {
                return  $this->model->createOntClass($this->uri);
        }
        
        /**
        * Answer a view of this resource as an Individual
        *
        * @return       object Individual 
        * @access       public
        */
        function asIndividual()
        {
                return  $this->model->createIndividual($this->uri);
        }
        
        /**
        * Answer a view of this resource as a property
        *
        * @return       object OntProperty
        * @access       public
        */
        function asOntProperty()
        {
                return  $this->model->createOntProperty($this->uri);
        }
        
        /**
        * Answer a reference to the ontology language profile that governs the 
        * ontology model to which this ontology resource is attached.
        *
        * @param        string  $uri
        * @return       object OntClass 
        * @access       public
        */
        function getVocabulary()
        {
                return $this->vocabulary ;
        }
        
        /**
        * Answer the value of a given RDF property for this resource as $returnType, or null 
        * if it doesn't have one. If there is more than one RDF statement with 
        * the given property for the current value, it is not defined which of 
        * the values will be returned.
        * The following return Types are supported: 'OntClass', 'OntProperty', 'Individual', and 'ResResource'
        * Default is 'ResResource'
        *
        * @param        object ResResource      $property
        * @param        string  $returnType
        * @return       object OntClass 
        * @access       public
        */
        function getPropertyValue($property, $returnType = 'ResResource')
        {
                $statement=$this->getProperty($property);
                if ($statement===null)
                        return null;
                        
                        switch ($returnType) 
                        {
                                case 'OntClass':
                                        return $this->model->createOntClass($statement->getLabelObject());              
                                        break;
                                        
                                case 'OntProperty':
                                        return $this->model->createOntProperty($statement->getLabelObject());           
                                        break;
                                
                                case 'Individual':
                                        return $this->model->createIndividual($statement->getLabelObject());            
                                        break;
                        
                                default:
                                        return $statement->getObject();
                                        break;  
                        }       
        }
        
        /**
        * Answer true if this resource has the given comment.
        *
        * @param        object ResLiteral       $resLiteral
        * @return       boolean 
        * @access       public
        */
        function hasComment($resLiteral)
        {
                return $this->hasProperty($this->vocabulary->COMMENT(),$resLiteral);
        }
        
        /**
        * Answer true if this resource has the given label.
        *
        * @param        object ResLiteral       $resLiteral
        * @return       boolean 
        * @access       public
        */
        function hasLabelProperty($resLiteral)
        {
                return $this->hasProperty($this->vocabulary->LABEL(),$resLiteral);
        }
        
        /**
        * Answer true if this resource has the given rdf:type.
        *
        * @param        object ResResource      $ontClass
        * @return       boolean 
        * @access       public
        */
        function hasRDFType($ontClass)
        {
                return $this->hasProperty($this->vocabulary->TYPE(),$ontClass);
        }
        
        /**
        * Answer true if this resource has the given resource as a source 
        * of additional information.
        *
        * @param        object ResResource      $resResource
        * @return       boolean 
        * @access       public
        */
        function hasSeeAlso($resResource)
        {
                return $this->hasProperty($this->vocabulary->SEE_ALSO(),$resResource);
        }
        
        /**
        * Answer true if this resource is defined by the given resource.
        *
        * @param        object ResResource      $resResource
        * @return       boolean 
        * @access       public
        */
        function isDefinedBy($resResource)
        {
                return $this->hasProperty($this->vocabulary->IS_DEFINED_BY(),$resResource);
        }
        
        /**
        * Answer an array of all of the comment literals for this resource.
        *
        * @param        string  $language
        * @return       array
        * @access       public
        */
        function listComments($language)
        {
                $return=$this->listProperty($this->vocabulary->COMMENT());
                if ($language === false)
                        return $return;
                                        
                foreach ($return as $key => $resLiteral) 
                {
                        if (!is_a($resLiteral,'ResLiteral') || $resLiteral->getLanguage() != $language)
                                unset ($return[$key]);  
                }
                return $return; 
        }
        
        /**
        * Answer an array of all of the resources that are declared to define this resource.
        *
        * @return       array
        * @access       public
        */
        function listIsDefinedBy()
        {
                return $this->listProperty($this->vocabulary->IS_DEFINED_BY());
        }
        
        /**
        * Answer an array of all of the label literals for this resource, with the given
        * language, if $language is set.
        *
        * @return       array
        * @access       public
        */
        function listLabelProperties($language = false)
        {
                $return=$this->listProperty($this->vocabulary->LABEL());
                if ($language === false)
                        return $return;
                                        
                foreach ($return as $key => $resLiteral) 
                {
                        if (!is_a($resLiteral,'ResLiteral') || $resLiteral->getLanguage() != $language)
                                unset ($return[$key]);  
                }
                return $return; 
        
        }
        
        /**
        * Answer an array of the RDF classes to which this resource belongs.
        * If $direct is true, only answer those resources that are direct types of 
        * this resource, not the super-classes of the class etc.
        * 
        * @param        boolean $direct
        * @return       array Array of ResResources
        * @access       public
        */
        function listRDFTypes($direct = true)
        {
                return $this->listProperty($this->vocabulary->TYPE());          
        }
        
        /**
        * Answer an array of all of the resources that are declared to 
        * provide addition information about this resource.
        *       
        * @return       array Array of ResResources
        * @access       public
        */
        function listSeeAlso()
        {
                return $this->listProperty($this->vocabulary->SEE_ALSO());      
        }
        
        /**
        * Answer an array of values of a given RDF property for this resource as $returnType, or null 
        * if it doesn't have one. 
        * The following return Types are supported: 'OntClass', 'OntProperty', 'Individual', and 'ResResource'
        * Default is 'ResResource'
        *
        * @param        object ResResource      $property
        * @param        string  $returnType
        * @return       array of ResResources 
        * @access       public
        */
        function listProperty($property, $returnType = 'OntResource')
        {
                $return=array();
                $resArray = $this->listProperties($property);
                foreach ($resArray as $statement) 
                {
                        switch ($returnType) 
                        {
                                case 'OntClass':
                                        $return[]=$this->model->createOntClass($statement->getLabelObject());           
                                        break;
                                        
                                case 'OntProperty':
                                        $return[]=$this->model->createOntProperty($statement->getLabelObject());                
                                        break;
                                
                                case 'Individual':
                                        $return[]=$this->model->createIndividual($statement->getLabelObject());         
                                        break;
                        
                                default:
                                        $return[]=$statement->getObject();
                                        break;
                        }       
                }
                return $return; 
        }
        
        /**
        * Remove the statement that the given ResLiteral is a comment on this resource.
        * Returns true, if a statement was removed
        *
        * @param        object ResLiteral $resLiteral
        * @return       boolean
        * @access       public
        */
        function removeComment($resLiteral)
        {
                return $this->removeProperty($this->vocabulary->COMMENT(),$resLiteral);
        }
        
        /**
        * Remove the statement that this resource is defined by the given resource.
        *
        * @param        object ResResource $resResource
        * @return       boolean 
        * @access       public
        */
        function removeDefinedBy($resResource)
        {
                return $this->removeProperty($this->vocabulary->IS_DEFINED_BY(),$resResource);
        }
        
        /**
        * Remove the statement that the given ResLiteral is a label on this resource.
        * Returns true, if a statement was removed
        *
        * @param        object ResLiteral $resLiteral
        * @return       boolean
        * @access       public
        */
        function removeLabelProperty($resLiteral)
        {
                return $this->removeProperty($this->vocabulary->LABEL(),$resLiteral);
        }
        
        /**
        * Remove the specific property-value pair from this resource.
        *
        * @param        object ResResource      $property
        * @param        object ResResource      $value
        * @return       boolean 
        * @access       public
        */
        function removeProperty($property, $value)
        {
                return $this->model->remove(new Statement($this,$property,$value));
        }
        
        /**
        * Remove the statement that this resource is of the given RDF type.
        *
        * @param        object ResResource $resResource
        * @return       boolean 
        * @access       public
        */
        function removeRDFType($resResource)
        {
                return $this->removeProperty($this->vocabulary->TYPE(),$resResource);
        }
        
        /**
        * Remove the statement indicating the given resource as a source of 
        * additional information about this resource. 
        *
        * @param        object ResResource $resResource
        * @return       boolean 
        * @access       public
        */
        function removeSeeAlso($resResource)
        {
                return $this->removeProperty($this->vocabulary->SEE_ALSO(),$resResource);
        }
        
        /**
        * Assert that the given string is the comment on this resource. 
        * Any existing statements for comment will be removed.
        *
        * @param        object ResLiteral       $resLiteral 
        * @access       public
        */
        function setComment($resLiteral)
        {
                $this->setPropertyValue($this->vocabulary->COMMENT(),$resLiteral);
        }
        
        /**
        * Assert that the given resource provides a source of definitions about this resource. 
        * Any existing statements for isDefinedBy will be removed.
        *
        * @param        object ResResource      $resResource 
        * @access       public
        */
        function setIsDefinedBy($resResource)
        {
                $this->setPropertyValue($this->vocabulary->IS_DEFINED_BY(),$resResource);
        }
        
        /**
        * Assert that the given string is the label on this resource. 
        * Any existing statements for comment will be removed.
        *
        * @param        object ResLiteral       $resLiteral 
        * @access       public
        */
        function setLabelProperty($resLiteral)
        {
                $this->setPropertyValue($this->vocabulary->LABEL(),$resLiteral);
        }
        
        /**
        * Set the value of the given property of this ontology resource to the given value. 
        * Maintains the invariant that there is at most one value of the property for a 
        * given resource, so existing property values are first removed. 
        * To add multiple properties, use addProperty.
        *
        * @param        object ResResource      $property
        * @param        object ResResource      $value  
        * @access       public
        */
        function setPropertyValue($property, $value)
        {
                $this->removeAll($property);
                $this->addProperty($property,$value);
        }
        
        /**
        * Set the RDF type (ie the class) for this resource, 
        * replacing any existing rdf:type property. Any existing statements 
        * for the RDF type will first be removed.
        *
        * @param        object ResResource      $resResource 
        * @access       public
        */
        function setRDFType($resResource)
        {
                $this->setPropertyValue($this->vocabulary->TYPE(),$resResource);
        }
        
        /**
        * Add a resource that is declared to provided additional information 
        * about the definition of this resource
        *
        * @param        object ResResource      $resResource 
        * @access       public
        */
        function setSeeAlso($resResource)
        {
                $this->setPropertyValue($this->vocabulary->SEE_ALSO(),$resResource);
        }
        
        /**
        * Returns an array of ResResources that are recursively connected by $attribute 
        * in superProperty direction.
        * If $onlyFindThisResResource is set to a ResResource, this function returns boolean
        * if this distinct resource recursively is connected to the $startResource.
        *
        * @param        object ResResource      $startResource
        * @param        object ResResource      $attribute
        * @param        array                           $attribute
        * @param        object ResResource      $onlyFindThisResResource        
        * @return       array OR boolean 
        * @access       private
        */
        function _getSuperAttributeStatementsRec(& $startResource,& $attribute,& $attributeIndex, $onlyFindThisResResource = false)
        {

                $return = $startResource->listProperties($attribute);
                
                if ($onlyFindThisResResource)
                {
                        foreach ($return as $statement)
                        {
                                if ($onlyFindThisResResource->equals($statement->getObject()))
                                        return true;
                        }       
                }
                
                foreach ($return as $statement)
                {
                        $attributeLabel=$statement->getLabelObject();
                        if (!in_array($attributeLabel,$attributeIndex))
                        {
                                $attributeIndex[]=$attributeLabel;
                                $subReturn = $this->_getSuperAttributeStatementsRec($statement->getObject(), $attribute, $attributeIndex, $onlyFindThisResResource);
                        } 
                }
                if (isset($subReturn))
                {
                        if ($subReturn === true)
                                return true;
                        return array_merge($return,$subReturn);
                }       
                
                return $return;
        }
        
        /**
        * Returns an array of ResResources that are recursively connected by $attribute 
        * in subProperty direction.
        * If $onlyFindThisResResource is set to a ResResource, this function returns boolean
        * if this distinct resource recursively is connected to the $startResource.
        *
        * @param        object ResResource      $startResource
        * @param        object ResResource      $attribute
        * @param        array                           $attribute
        * @param        object ResResource      $onlyFindThisResResource        
        * @return       array OR boolean 
        * @access       private
        */
        function _getSubAttributeStatementsRec(& $startResource,& $attribute,& $attributeIndex, $onlyFindThisResResource = false)
        {

                $return = $this->model->find(null,$attribute,$startResource);
                
                if ($onlyFindThisResResource)
                {
                        foreach ($return as $statement)
                        {
                                if ($onlyFindThisResResource->equals($statement->getSubject()))
                                        return true;
                        }       
                }
                
                foreach ($return as $statement)
                {
                        $attributeLabel=$statement->getLabelSubject();
                        if (!in_array($attributeLabel,$attributeIndex))
                        {
                                $attributeIndex[]=$attributeLabel;
                                $subReturn = $this->_getSubAttributeStatementsRec($statement->getSubject(), $attribute, $attributeIndex, $onlyFindThisResResource);
                        } 
                }
                if (isset($subReturn))
                {
                        if ($subReturn === true)
                                return true;
                        return array_merge($return,$subReturn);
                }
                        
                return $return;
        }
        
        /**
        * Add a property to this resource.
        * A statement with this resource as the subject, p as the predicate and o 
        * as the object is added to the model associated with this resource.
        * If $this->rdfType is set, an additional statement about it's type
        * is added.
        *
        * @param        ResResource                             $property
        * @param        ResResource/ResLiteral  $object
        * @return       object ResResource 
        * @access       public
        */
        function addProperty($property,$object)
        {
                if ($this->rdfType !== false)
                        if (!$this->hasRDFType($this->rdfType))
                                        $this->model->add(new Statement($this,$this->vocabulary->TYPE(),$this->rdfType));
        
                return parent:: addProperty($property,$object);
        }
        
        /**
    * Sets the rdf:type, that this distinct resource is instance of.
    * If this value is set, the ontModel will add an additional 
    * statement about this resource and the fiven rdf:type
    *
    * @param object ResResource $resResource 
        * @access       public
    */
        function setInstanceRdfType($resResource)
        {
                $this->rdfType = $resResource;
        }
        
        /**
    * returns the rdf:type, that this distinct resource is instance of.
    *
    * @return object ResResource $resResource 
        * @access       public
    */
        function getInstanceRdfType()
        {
                return $this->rdfType;
        }
} 
?>