filesystem.php

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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Wolfram Kriesing <[e-mail]>                      |
// +----------------------------------------------------------------------+
//
//  $Id: Filesystem.php,v 1.3 2003/01/04 11:56:28 mj Exp $

require_once('Tree/Error.php');

/**
*   the Filesystem interface to the tree class
*   this is a bit different, as id we use the entire path, since we know
*   this is unique in a filesystem and an integer id could only be created
*   virtually, it doesnt have a tight connection to the actual directory
*   i.e. using 'add' with ids could fail since we dont know if we get the same
*   id when we call 'add' with a parentId to create a new folder under since our id would be made up.
*   so we use the complete path as id, which takes up a lot of memory, i know
*   but since php is typeless its possible and it makes life easier when
*   we want to create another dir, since we get the dir as parentId passed to the
*   'add' method, whcih makes it easy to create a new dir there :-)
*   i also thought about hashing the path name but then the add method is not that
*   easy to implement ... may be one day :-)
*
*   @access     public
*   @author     Wolfram Kriesing <[e-mail]>
*   @version    2001/06/27
*   @package    Tree
*/
class Tree_Memory_Filesystem
{

    /**
    *   @access public
    *   @var    array   saves the options passed to the constructor
    */
    var $options =  array(  'order'     =>'',   // which column to order by when reading the data from the DB, this sorts the data even inside every level
                            // the column-name maps are used for the "as" in the select queries
                            // so you can use any column name in the table and "map" it to the name that shall be used in the
                            // internal array, that is built, see the examples (in comments)
                            'columnNameMaps'=>array(
                                   /*           'id'            =>  'tree_id',   // use "tree_id" as "id"
                                                'parentId'      =>  'parent_id',
                                                'prevId'        =>  'previous_id',
                                                'name'          =>  'nodeName'
                                   */
                                                ),
                            );

    /**
    *   set up this object
    *
    *   @version    2002/08/23
    *   @access     public
    *   @author     Wolfram Kriesing <[e-mail]>
    *   @param      string  $dsn    the path on the filesystem
    *   @param      array   $options  additional options you can set
    */
    function Tree_Memory_Filesystem( $path , $options=array() )
    {
        $this->_path = $path;
        $this->_options = $options; // not in use currently
/*        $this->Tree_OptionsDB( $dsn , $options ); // instanciate DB
        if( is_string($options) )                  // just to be backward compatible, or to make the second paramter shorter
        {
            $this->setOption( 'order' , $options );
        }

        $this->table = $this->getOption('table');
*/
    } // end of function

    /**
    *   retreive all the navigation data from the db and call build to build the
    *   tree in the array data and structure
    *
    *   @version    2001/11/20
    *   @access     public
    *   @author     Wolfram Kriesing <[e-mail]>
    *   @return     boolean     true on success
    */
    function setup()
    {
        unset($this->data);                         // unset the data to be sure to get the real data again, no old data
        if( is_dir($this->_path) )
        {
            $this->data[$this->_path] = array('id'=>$this->_path,'name'=>$this->_path,'parentId'=>0);
            $this->_setup($this->_path,$this->_path);
        }

        return $this->data;
    }

    function _setup( $path , $parentId=0 )
    {
        if ($handle = opendir($path))
        {
            while (false !== ($file = readdir($handle)))
            {
                if( $file != '.' && $file != '..' && is_dir("$path/$file"))
                {
                    #$id = sizeof($this->data);
                    $this->data[] = array('id'=>"$path/$file",'name'=>$file,'parentId'=>$parentId);
                    $this->_setup( "$path/$file" , "$path/$file" );
                }
            }
            closedir($handle);
        }

    }


    /**
    *   this is tricky on a filesystem, since we are working with id's
    *   as identifiers and we need to be sure, the parentId to create a node under
    *   is the same as when the tree was last read, but this might be tricky
    *
    */
    function add( $newValues , $parent=0 , $prevId=0 )
    {
        if( !$parent )
            $parent = $this->path;

# FIXXME do the mapping
        if( !@mkdir( "$parent/{$newValues['name']}" , 0700 ) )
            return $this->_throwError('couldnt create dir '.$newValues['name'].' under '.$parent,__LINE__);
        return "$parent/{$newValues['name']}";
    }

    function remove( $id )
    {
        if( !@rmdir( $id ) )
            return $this->_throwError('couldnt remove dir '.$id,__LINE__);
        return true;
    }

    function copy(  $srcId , $destId  )
    {
        # if( !@copy( $srcId , $destId ) ) this would only be for files :-)
# FIXXME loop through the directory to copy the children too !!!

        $dest = $destId.'/'.preg_replace('/^.*\//','',$srcId);

        if( is_dir( $dest ) )
            return $this->_throwError("couldnt copy, $destId already exists in $srcId " , __LINE__ );

        if( !@mkdir( $dest , 0700 ) )
            return $this->_throwError("couldnt copy dir from $srcId to $destId " , __LINE__ );
        return true;
    }

    /**
    *
    *
    *   @access     private
    *   @version    2002/03/02
    *   @author     Wolfram Kriesing <[e-mail]>
    *   @param
    *   @return
    */
    function _throwError( $msg , $line , $mode=null )
    {
        return new Tree_Error( $msg , $line , __FILE__ , $mode , $this->db->last_query );
    }

    /**
    *   prepare multiple results
    *
    *   @see        _prepareResult()
    *   @access     private
    *   @version    2002/03/03
    *   @author     Wolfram Kriesing <[e-mail]>
    *   @param
    *   @return
    */
    function _prepareResults( $results )
    {
        $newResults = array();
        foreach( $results as $aResult )
            $newResults[] = $this->_prepareResult($aResult);
        return $newResults;
    }

    /**
    *   map back the index names to get what is expected
    *
    *   @access     private
    *   @version    2002/03/03
    *   @author     Wolfram Kriesing <[e-mail]>
    *   @param
    *   @return
    */
    function _prepareResult( $result )
    {
        $map = $this->getOption('columnNameMaps');

        if( $map )
        foreach( $map as $key=>$columnName )
        {
            $result[$key] = $result[$columnName];
            unset($result[$columnName]);
        }
        return $result;
    }


} // end of class
?>