TextContentHandler.php

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<?php
class TextContentHandler extends ContentHandler {

        public function __construct( $modelId = CONTENT_MODEL_TEXT, $formats = array( CONTENT_FORMAT_TEXT ) ) {
                parent::__construct( $modelId, $formats );
        }

        public function serializeContent( Content $content, $format = null ) {
                $this->checkFormat( $format );
                return $content->getNativeData();
        }

        public function merge3( Content $oldContent, Content $myContent, Content $yourContent ) {
                $this->checkModelID( $oldContent->getModel() );
                $this->checkModelID( $myContent->getModel() );
                $this->checkModelID( $yourContent->getModel() );

                $format = $this->getDefaultFormat();

                $old = $this->serializeContent( $oldContent, $format );
                $mine = $this->serializeContent( $myContent, $format );
                $yours = $this->serializeContent( $yourContent, $format );

                $ok = wfMerge( $old, $mine, $yours, $result );

                if ( !$ok ) {
                        return false;
                }

                if ( !$result ) {
                        return $this->makeEmptyContent();
                }

                $mergedContent = $this->unserializeContent( $result, $format );
                return $mergedContent;
        }

        public function unserializeContent( $text, $format = null ) {
                $this->checkFormat( $format );

                return new TextContent( $text );
        }

        public function makeEmptyContent() {
                return new TextContent( '' );
        }
}