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( '' );
    }
}