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         // @codingStandardsIgnoreStart bug 57585
  33         public function __construct( $modelId = CONTENT_MODEL_TEXT,
  34                 $formats = array( CONTENT_FORMAT_TEXT )
  35         ) {
  36                 parent::__construct( $modelId, $formats );
  37         }
  38         // @codingStandardsIgnoreEnd
  39
  40         /**
  41          * Returns the content's text as-is.
  42          *
  43          * @param $content Content
  44          * @param $format string|null
  45          * @return mixed
  46          */
  47         public function serializeContent( Content $content, $format = null ) {
  48                 $this->checkFormat( $format );
  49
  50                 return $content->getNativeData();
  51         }
  52
  53         /**
  54          * Attempts to merge differences between three versions. Returns a new
  55          * Content object for a clean merge and false for failure or a conflict.
  56          *
  57          * All three Content objects passed as parameters must have the same
  58          * content model.
  59          *
  60          * This text-based implementation uses wfMerge().
  61          *
  62          * @param $oldContent Content|string  String
  63          * @param $myContent Content|string   String
  64          * @param $yourContent Content|string String
  65          *
  66          * @return Content|Bool
  67          */
  68         public function merge3( Content $oldContent, Content $myContent, Content $yourContent ) {
  69                 $this->checkModelID( $oldContent->getModel() );
  70                 $this->checkModelID( $myContent->getModel() );
  71                 $this->checkModelID( $yourContent->getModel() );
  72
  73                 $format = $this->getDefaultFormat();
  74
  75                 $old = $this->serializeContent( $oldContent, $format );
  76                 $mine = $this->serializeContent( $myContent, $format );
  77                 $yours = $this->serializeContent( $yourContent, $format );
  78
  79                 $ok = wfMerge( $old, $mine, $yours, $result );
  80
  81                 if ( !$ok ) {
  82                         return false;
  83                 }
  84
  85                 if ( !$result ) {
  86                         return $this->makeEmptyContent();
  87                 }
  88
  89                 $mergedContent = $this->unserializeContent( $result, $format );
  90
  91                 return $mergedContent;
  92         }
  93
  94         /**
  95          * Unserializes a Content object of the type supported by this ContentHandler.
  96          *
  97          * @since 1.21
  98          *
  99          * @param $text   string serialized form of the content
 100          * @param $format null|String the format used for serialization
 101          *
 102          * @return Content the TextContent object wrapping $text
 103          */
 104         public function unserializeContent( $text, $format = null ) {
 105                 $this->checkFormat( $format );
 106
 107                 return new TextContent( $text );
 108         }
 109
 110         /**
 111          * Creates an empty TextContent object.
 112          *
 113          * @since 1.21
 114          *
 115          * @return Content
 116          */
 117         public function makeEmptyContent() {
 118                 return new TextContent( '' );
 119         }
 120 }