/** * Licensed under the Artistic License; you may not use this file * except in compliance with the License. * You may obtain a copy of the License at * *      http://displaytag.sourceforge.net/license.html * * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */package org.displaytag.decorator;import javax.servlet.jsp.PageContext;import org.apache.commons.lang.StringEscapeUtils;import org.displaytag.properties.MediaTypeEnum;/** * This takes the string that is passed in, and escapes html tags and entities. Only operates on "html" or "xml" media. * @author Fabrizio Giustina * @version $Revision$ ($Author$) */public class EscapeXmlColumnDecorator implements DisplaytagColumnDecorator{    /**     * Instance used for the "escapeXml" tag attribute.     */    public static final DisplaytagColumnDecorator INSTANCE = new EscapeXmlColumnDecorator();    /**     * @see org.displaytag.decorator.DisplaytagColumnDecorator#decorate(Object, PageContext, MediaTypeEnum)     */    public Object decorate(Object columnValue, PageContext pageContext, MediaTypeEnum media)    {        if (columnValue == null || (!media.equals(MediaTypeEnum.HTML) && !media.equals(MediaTypeEnum.XML)))        {            return columnValue;        }        return StringEscapeUtils.escapeXml(columnValue.toString());    }}