<?php // $Id: view_field_xml.class.php 68 2009-07-31 18:23:01Z dlandau $

///////////////////////////////////////////////////////////////////////////
//                                                                       //
// NOTICE OF COPYRIGHT                                                   //
//                                                                       //
// Moodle - Modular Object-Oriented Dynamic Learning Environment         //
//          http://moodle.com                                            //
//                                                                       //
// Copyright (C) 1999 onwards Martin Dougiamas        http://dougiamas.com  //
//           (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
//                                                                       //
// This program is free software; you can redistribute it and/or modify  //
// it under the terms of the GNU General Public License as published by  //
// the Free Software Foundation; either version 2 of the License, or     //
// (at your option) any later version.                                   //
//                                                                       //
// This program is distributed in the hope that it will be useful,       //
// but WITHOUT ANY WARRANTY; without even the implied warranty of        //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
// GNU General Public License for more details:                          //
//                                                                       //
//          http://www.gnu.org/copyleft/gpl.html                         //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

/// This class will display the XML for one field being edited

class view_field_xml extends XMLDBAction {

    /**
     * Init method, every subclass will have its own
     */
    function init() {
        parent::init();

    /// Set own custom attributes

    /// Get needed strings
        $this->loadStrings(array(
        /// 'key' => 'module',
        ));
    }

    /**
     * Invoke method, every class will have its own
     * returns true/false on completion, setting both
     * errormsg and output as necessary
     */
    function invoke() {
        parent::invoke();

        $result = true;

    /// Set own core attributes
        $this->does_generate = ACTION_GENERATE_XML;

    /// These are always here
        global $CFG, $XMLDB;

    /// Do the job, setting result as needed

    /// Get the file parameter
        $field =  required_param('field', PARAM_PATH);
        $table =  required_param('table', PARAM_PATH);
        $select = required_param('select', PARAM_ALPHA); //original/edited
    /// Get the dir containing the file
        $dirpath = required_param('dir', PARAM_PATH);
        $dirpath = $CFG->dirroot . stripslashes_safe($dirpath);

    /// Get the correct dir
        if ($select == 'original') {
            if (!empty($XMLDB->dbdirs)) {
                $base =& $XMLDB->dbdirs[$dirpath];
            }
        } else if ($select == 'edited') {
            if (!empty($XMLDB->editeddirs)) {
                $base =& $XMLDB->editeddirs[$dirpath];
            }
        } else {
            $this->errormsg = 'Cannot access to ' . $select . ' info';
            $result = false;
        }
        if ($base) {
        /// Only if the directory exists and it has been loaded
            if (!$base->path_exists || !$base->xml_loaded) {
                $this->errormsg = 'Directory ' . $dirpath . ' not loaded';
                return false;
            }
        } else {
            $this->errormsg = 'Problem handling ' . $select . ' files';
            return false;
        }

    /// Get the structure
        if ($result) {
            if (!$structure =& $base->xml_file->getStructure()) {
                $this->errormsg = 'Error retrieving ' . $select . ' structure';
                $result = false;
            }
        }
    /// Get the tables
        if ($result) {
            if (!$tables =& $structure->getTables()) {
                $this->errormsg = 'Error retrieving ' . $select . ' tables';
                $result = false;
            }
        }
    /// Get the table
        if ($result && !$t = $structure->getTable($table)) {
            $this->errormsg = 'Error retrieving ' . $table . ' table';
            $result = false;
        }
    /// Get the fields
        if ($result) {
            if (!$fields =& $t->getFields()) {
                $this->errormsg = 'Error retrieving ' . $select . ' fields';
                $result = false;
            }
        }
    /// Get the field
        if ($result && !$f = $t->getField($field)) {
            $this->errormsg = 'Error retrieving ' . $field . ' field';
            $result = false;
        }

        if ($result) {
        /// Everything is ok. Generate the XML output
            $this->output = $f->xmlOutput();
        } else {
        /// Switch to HTML and error
            $this->does_generate = ACTION_GENERATE_HTML;
        }

    /// Return ok if arrived here
        return $result;
    }
}
?>
