Source for file class_relationship.php

<?php
class relationship extends b_object {
    
    var $typeID;
    var $primaryID;
    var $secondaryID;
 
    function relationship( $constructID = NULL, $type = NULL, $primary = NULL, $secondary = NULL ) {
        if( $type ) {
            $this->type =& $GLOBALS['core']->get_relationship_type( $type );
            
            if( !$constructID ) {
                //if ID isn't specified or doesn't exist in database make a new object
                if( $type && $primary && $secondary && !strstr( $primary, "*new*" ) && !strstr( $secondary, "*new*" ) ) {
                //if a new object is being instantiated with values
                    global $db;
                    $db->hide_errors();
                    $defined = $db->get_results( "SELECT id FROM relationships WHERE typeID = '".$type."' AND primaryID = '".$primary."' AND secondaryID = '".$secondary."'" );
                    if( !count($defined) ) {
                    //if the relationship isn't already defined
                        $this->set( array( 'typeID'=>$type, 'primaryID'=>$primary, 'secondaryID'=>$secondary ) );
                    } else {
                        $defined = reset($defined);
                        if( $defined ) { $this->relationship( $defined['id'], $type ); }
                        else { return false; }
                    }
                } else {
                //if a new object is being created without values
                    echo 'RELATIONSHIP INSTANTIATED WITHOUT INITIAL VALUES -> BAD!!!';
                }
            } else if( array_key_exists( $constructID, $this->type->objects ) ) { 
                //else initialize variables
                $this->id = $constructID;
                global $db;
    
                $object_info = reset($db->get_results( "SELECT * FROM ".$this->type->type_table_name." WHERE id = '".$constructID."'", ARRAY_A ));
                
                $this->typeID = $object_info['typeID'];
                $this->primaryID = $object_info['primaryID'];
                $this->secondaryID .= $object_info['secondaryID'];
            }
            
            $this->type->register_object($this);
            unset( $this->satisfied_constraints );
        } else {
            echo "NO TYPE SPECIFIED FOR RELATIONSHIP";
        }
    }
    
    function verify_set( &$values) {
        if( strtok( $values['related'], '?' ) == '*new*' ) {
            $constraintIDs = unserialize( strtok( '?' ) );
            //NOTE: note sure where to go from here...
        } else {
            if( $values['typeID'] ) {
                if( $values['target'] = "primary" ) { 
                    $primary = $values['related']; $secondary = $values['object']; 
                } else {
                    $primary = $values['object']; $secondary = $values['related']; 
                }
                if( $primary && $secondary ) {
                    parent::verify_set( array( 'typeID'=>$values['typeID'], 'primaryID'=>$primary, 'secondaryID'=>$secondary ) );
                } else {
                    echo 'NEW RELATIONSHIP IS MISSING CONSTITUENT ELEMENTS';
                }
            } else {
                echo 'NEW RELATIONSHIP IS MISSING RELATIONSHIP TYPE';
            }
        }
        unset( $values['action'] );
        unset( $values['target'] );
        unset( $values['typeID'] );
        unset( $values['referrer'] );
        unset( $values['object'] );
        unset( $values['related'] );
     }
    function set( $values ) {
        parent::set( $values );
        
        if( $this->primaryID == $GLOBALS['user']->id || $this->secondaryID == $GLOBALS['user']->id ) {
        //if the relationship involves the current user reset their satisfied constraints
            unset( $GLOBALS['user']->satisfied_constraints );
        } else if( $this->type->type_name == 'permission-constraint' ) {
        //if a new permission-constraint relationship is being set unset the permission
            $permission =& get_object( $this->primaryID );
            $permission->permission( $permission->id, $permission->type->type_id );
            unset( $GLOBALS['permissions'][$permission->name] );
        }
    }
    //NOTE: relationships don't really have any properties to set, they should be deleted and re-created if they need to be changed
    
    
    
    function get_index( $direction = NULL ) {
        return $this->type->get_index( $direction );
    }
    
    function get_content() {
        $returnString;
        $primary =& get_object( $this->primaryID );
        $secondary =& get_object( $this->secondaryID );
        $returnString .= '<p>relationship id: '.$this->id.'<br>';
        $returnString .= 'relationship type: '.$this->type->type_name.'<br>';
        if( $primary ) { $returnString .= 'primary object: '.$primary->get_index().'<br>'; }
        if( $secondary ) { $returnString .= 'secondary object: '.$secondary->get_index().'<br>'; }
        
        return $returnString;
    }
}
 
?>