link_dictionary.php

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<?php

      /*
      *     This source code is a part of the Ultimix Project. 
      *     It is distributed under BSD license. All other third side source code (like tinyMCE) is distributed under 
      *     it's own license wich could be found from the corresponding files or sources. 
      *     This source code is provided "as is" without any warranties or garanties.
      *
      *     Have a nice day!
      *
      *     @url http://ultimix.sorceforge.net
      *
      *     @author Alexey "gdever" Dodonov
      */
      
      class link_dictionary_1_0_0{
            
            var                           $LinkTypesDictionary = false;
            
            var                           $Database = false;
            var                           $Security = false;
            
            function                __construct()
            {
                  try
                  {
                        $this->Database = get_package( 'database' , 'last' , __FILE__ );
                        $this->Security = get_package( 'security' , 'last' , __FILE__ );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_type_from_cache( $Object1Type , $Object2Type )
            {
                  try
                  {
                        $Types = array();

                        foreach( $this->LinkTypesDictionary as $k => $v )
                        {
                              if( $Object1Type !== false && $v->object1_type != $Object1Type )
                              {
                                    continue;
                              }
                              if( $Object2Type !== false && $v->object2_type != $Object2Type )
                              {
                                    continue;
                              }

                              $Types [] = $v->id;
                        }
                        if( isset( $Types[ 0 ] ) )
                        {
                              return( implode( ',' , $Types ) );
                        }

                        return( false );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                fill_cache()
            {
                  try
                  {
                        if( $this->LinkTypesDictionary === false )
                        {
                              $this->Database->query_as( DB_OBJECT );
                              $this->LinkTypesDictionary = $this->Database->select( '*' , 'umx_link_dictionary' , "1 = 1" );
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                get_type_from_db( $Object1Type , $Object2Type )
            {
                  try
                  {
                        $this->fill_cache();

                        return( $this->get_type_from_cache( $Object1Type , $Object2Type ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                      create_link_type( $Object1Type , $Object2Type )
            {
                  try
                  {
                        $Object1Type = $this->Security->get( $Object1Type , 'string' );
                        $Object2Type = $this->Security->get( $Object2Type , 'string' );
                        
                        $this->Database->lock( array( 'umx_link_dictionary' ) , array( 'WRITE' ) );
                        $this->Database->insert( 'umx_link_dictionary' , 'object1_type , object2_type' , 
                                                             "'$Object1Type' , '$Object2Type'" );
                        $this->Database->commit();
                        $this->Database->unlock();
                        
                        $this->LinkTypesDictionary = false;
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_link_type( $Object1Type , $Object2Type )
            {
                  try
                  {
                        $LinkType = $this->get_type_from_db( $Object1Type , $Object2Type );
                        
                        if( $LinkType === false )
                        {
                              if( $Object1Type === false || $Object2Type === false )
                              {
                                    /* type with this parameters was not found */
                                    return( 0 );
                              }
                              else
                              {
                                    /* both types defined so we can create new link type */
                                    $this->create_link_type( $Object1Type , $Object2Type );
                                    
                                    return( $this->get_link_type( $Object1Type , $Object2Type ) );
                              }
                        }
                        else
                        {
                              return( $LinkType );
                        }
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
            
            function                get_link_literal_type( &$Type )
            {
                  try
                  {
                        $Type = is_array( $Type ) === true ? $Type : array( $Type );
                        $this->fill_cache();
                        $Types = array();
                        foreach( $this->LinkTypesDictionary as $k => $v )
                        {
                              foreach( $Type as $i => $t )
                              {
                                    if( $v->id == $t )
                                    {
                                          $Types [] = array( 
                                                'object1_type' => $v->object1_type , 'object2_type' => $v->object2_type
                                          );
                                    }
                              }
                        }
                        if( isset( $Types[ 0 ] ) === false )
                        {
                              throw( new Exception( 'Literal type of the link was not found' ) );
                        }
                        return( $Types );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }

?>