includes/content/TextContentHandler.php

   1 <?php
   2 /**
   3  * Base content handler class for flat text contents.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @since 1.21
  21  *
  22  * @file
  23  * @ingroup Content
  24  */
  25
  26 /**
  27  * Base content handler implementation for flat text contents.
  28  *
  29  * @ingroup Content
  30  */
  31 class TextContentHandler extends ContentHandler {
  32         public function __construct( $modelId = CONTENT_MODEL_TEXT,
  33                 $formats = array( CONTENT_FORMAT_TEXT )
  34         ) {
  35                 parent::__construct( $modelId, $formats );
  36         }
  37
  38         /**
  39          * Returns the content's text as-is.
  40          *
  41          * @param $content Content
  42          * @param $format string|null
  43          * @return mixed
  44          */
  45         public function serializeContent( Content $content, $format = null ) {
  46                 $this->checkFormat( $format );
  47
  48                 return $content->getNativeData();
  49         }
  50
  51         /**
  52          * Attempts to merge differences between three versions. Returns a new
  53          * Content object for a clean merge and false for failure or a conflict.
  54          *
  55          * All three Content objects passed as parameters must have the same
  56          * content model.
  57          *
  58          * This text-based implementation uses wfMerge().
  59          *
  60          * @param $oldContent Content|string  String
  61          * @param $myContent Content|string   String
  62          * @param $yourContent Content|string String
  63          *
  64          * @return Content|Bool
  65          */
  66         public function merge3( Content $oldContent, Content $myContent, Content $yourContent ) {
  67                 $this->checkModelID( $oldContent->getModel() );
  68                 $this->checkModelID( $myContent->getModel() );
  69                 $this->checkModelID( $yourContent->getModel() );
  70
  71                 $format = $this->getDefaultFormat();
  72
  73                 $old = $this->serializeContent( $oldContent, $format );
  74                 $mine = $this->serializeContent( $myContent, $format );
  75                 $yours = $this->serializeContent( $yourContent, $format );
  76
  77                 $ok = wfMerge( $old, $mine, $yours, $result );
  78
  79                 if ( !$ok ) {
  80                         return false;
  81                 }
  82
  83                 if ( !$result ) {
  84                         return $this->makeEmptyContent();
  85                 }
  86
  87                 $mergedContent = $this->unserializeContent( $result, $format );
  88
  89                 return $mergedContent;
  90         }
  91
  92         /**
  93          * Unserializes a Content object of the type supported by this ContentHandler.
  94          *
  95          * @since 1.21
  96          *
  97          * @param $text   string serialized form of the content
  98          * @param $format null|String the format used for serialization
  99          *
 100          * @return Content the TextContent object wrapping $text
 101          */
 102         public function unserializeContent( $text, $format = null ) {
 103                 $this->checkFormat( $format );
 104
 105                 return new TextContent( $text );
 106         }
 107
 108         /**
 109          * Creates an empty TextContent object.
 110          *
 111          * @since 1.21
 112          *
 113          * @return Content
 114          */
 115         public function makeEmptyContent() {
 116                 return new TextContent( '' );
 117         }
 118 }