includes/api/ApiFormatFeedWrapper.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 19, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * This printer is used to wrap an instance of the Feed class
  29  * @ingroup API
  30  */
  31 class ApiFormatFeedWrapper extends ApiFormatBase {
  32
  33         public function __construct( ApiMain $main ) {
  34                 parent::__construct( $main, 'feed' );
  35         }
  36
  37         /**
  38          * Call this method to initialize output data. See execute()
  39          * @param ApiResult $result
  40          * @param object $feed An instance of one of the $wgFeedClasses classes
  41          * @param array $feedItems Array of FeedItem objects
  42          */
  43         public static function setResult( $result, $feed, $feedItems ) {
  44                 // Store output in the Result data.
  45                 // This way we can check during execution if any error has occurred
  46                 // Disable size checking for this because we can't continue
  47                 // cleanly; size checking would cause more problems than it'd
  48                 // solve
  49                 $result->addValue( null, '_feed', $feed, ApiResult::NO_VALIDATE );
  50                 $result->addValue( null, '_feeditems', $feedItems, ApiResult::NO_VALIDATE );
  51         }
  52
  53         /**
  54          * Feed does its own headers
  55          *
  56          * @return null
  57          */
  58         public function getMimeType() {
  59                 return null;
  60         }
  61
  62         /**
  63          * ChannelFeed doesn't give us a method to print errors in a friendly
  64          * manner, so just punt errors to the default printer.
  65          * @return bool
  66          */
  67         public function canPrintErrors() {
  68                 return false;
  69         }
  70
  71         /**
  72          * This class expects the result data to be in a custom format set by self::setResult()
  73          * $result['_feed'] - an instance of one of the $wgFeedClasses classes
  74          * $result['_feeditems'] - an array of FeedItem instances
  75          * @param bool $unused
  76          */
  77         public function initPrinter( $unused = false ) {
  78                 parent::initPrinter( $unused );
  79
  80                 if ( $this->isDisabled() ) {
  81                         return;
  82                 }
  83
  84                 $data = $this->getResult()->getResultData();
  85                 if ( isset( $data['_feed'] ) && isset( $data['_feeditems'] ) ) {
  86                         $data['_feed']->httpHeaders();
  87                 } else {
  88                         // Error has occurred, print something useful
  89                         ApiBase::dieDebug( __METHOD__, 'Invalid feed class/item' );
  90                 }
  91         }
  92
  93         /**
  94          * This class expects the result data to be in a custom format set by self::setResult()
  95          * $result['_feed'] - an instance of one of the $wgFeedClasses classes
  96          * $result['_feeditems'] - an array of FeedItem instances
  97          */
  98         public function execute() {
  99                 $data = $this->getResult()->getResultData();
 100                 if ( isset( $data['_feed'] ) && isset( $data['_feeditems'] ) ) {
 101                         $feed = $data['_feed'];
 102                         $items = $data['_feeditems'];
 103
 104                         // execute() needs to pass strings to $this->printText, not produce output itself.
 105                         ob_start();
 106                         $feed->outHeader();
 107                         foreach ( $items as & $item ) {
 108                                 $feed->outItem( $item );
 109                         }
 110                         $feed->outFooter();
 111                         $this->printText( ob_get_clean() );
 112                 } else {
 113                         // Error has occurred, print something useful
 114                         ApiBase::dieDebug( __METHOD__, 'Invalid feed class/item' );
 115                 }
 116         }
 117 }