Dataface/LinkTool.php

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<?php
/*-------------------------------------------------------------------------------
 * Xataface Web Application Framework
 * Copyright (C) 2005-2008 Web Lite Solutions Corp (shannah@sfu.ca)
 * 
 * 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.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *-------------------------------------------------------------------------------
 */
import( 'Dataface/Application.php');
import( 'Dataface/Table.php');


class Dataface_LinkTool {

        public static function &getMask(){
                static $mask = -1;

                if ( $mask == -1 ){
                        $app =& Dataface_Application::getInstance();
                        $query =& $app->getQuery();
                        $table =& Dataface_Table::loadTable($query['-table']);
                        $mask = $_GET;
                        //echo "GET: "; print_r($_GET);
                        foreach ( $query as $key=>$value){
                                //if ( strpos($key,'--')!== 0 ){
                                if ( isset($table->_fields[$key]) or ($key{0} == '-' and $key != '-new')){
                                        //echo "Key $key";
                                        $mask[$key] = $value;
                                        
                                }
                        }
                        //print_r($mask);
                }
        
                return $mask;
        }
        
        
        public static function buildSetLink($query, $useContext=true, $forceContext=false){
        
                return Dataface_LinkTool::buildLink($query, $useContext, $forceContext, true);
        }

        public static function buildLink($query, $useContext=true, $forceContext=false, $stripRecordId=false){
                $app =& Dataface_Application::getInstance();
                $appQuery =& $app->getQuery();
                
                if ( $stripRecordId and isset($query['-recordid']) ) unset($query['-recordid']);
                
                if ( is_string($query) ){
                        $terms = explode('&', $query);
                        $query = array();
                        foreach ( $terms as $term){
                                $key = urldecode(substr($term, 0, strpos($term,'=')));
                                $value = urldecode(substr($term, strpos($term,'=')+1));
                                if ( strlen($value) == 0 ){
                                        $query[$key] = null;
                                } else {
                                        $query[$key] = $value;
                                }
                        }
                
                }
                
                if ( !isset($query['-table']) ) $query['-table'] = $appQuery['-table'];
                
                if ( !$forceContext and $useContext ){
                        // We check if the query parameters have changed.  If they have, then it doesn't
                        // make a whole lot of sense to maintain context.
                        foreach ( $query as $key=>$val) {
                                if ( !$key ) continue;
                                if ( $key{0} != '-' and $query[$key] != @$appQuery[$key] ){
                                        $useContext = false;
                                        break;
                                }
                        }
                }
                
                if ( $useContext){
                        $request = Dataface_LinkTool::getMask();
                        if ( $stripRecordId and isset($request['-recordid']) ) unset($request['-recordid']);
                        
                        if ( isset( $query['-relationship'] ) ){
                                if ( $query['-relationship'] != @$appQuery['-relationship'] ){
                                        foreach ( $request as $qkey=>$qval ){
                                                if ( strstr($qkey, '-related:') == $qkey ) unset($request[$qkey]);
                                        }
                                }
                        }
                        
                        if ( isset($request['-sort']) and $request['-table'] != $appQuery['-table'] ){
                                unset($request['-sort']);
                        }
                        
                        //print_r($query);
                        $query = array_merge($request, $query);
                }
                
                if ( !isset($query['-search']) ) $query['-search'] = null;
                if ( isset( $_REQUEST['-search'] ) and strlen($_REQUEST['-search'])>0 and $query['-search'] !== null  ){
                        $query['-search'] = $_REQUEST['-search'];
                }
                
                foreach ($query as $key=>$value) {
                        if ( $value === null || strpos($key, '--') === 0 ){
                                unset($query[$key]);
                        }
                }
                
                $str = '';
                foreach ($query as $key=>$value) {
                        
                        if ( is_array($value) ){
                                
                                foreach ( $value as $vkey=>$vval ){
                                        $str .= urlencode($key.'['.$vkey.']').'='.urlencode($vval).'&';
                                }
                        }
                        else {
                                $str .= urlencode($key).'='.urlencode($value).'&';
                        }
                }
                $str = substr($str,0, strlen($str)-1);
   
                
                $url = DATAFACE_SITE_HREF;
                if ( strpos('?', $url) !== false ){
                        $url .= '&'.$str;
                } else {
                        $url .= '?'.$str;
                }

                $url = $app->filterUrl($url);
                return df_absolute_url($url);
        }
        
        
        public static function &getInstance(){
                static $instance = 0;
                if ( !$instance ){
                        $instance = new Dataface_LinkTool();
                }
                return $instance;
        }

}