001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.runtime.functions.decision;
020
021import java.io.StringReader;
022
023import lucee.runtime.PageContext;
024import lucee.runtime.ext.function.Function;
025import lucee.runtime.op.Caster;
026import lucee.runtime.text.xml.XMLUtil;
027
028import org.w3c.dom.Node;
029import org.xml.sax.InputSource;
030
031/**
032 * Check if a String is a well-formed XML
033 */
034public final class IsXML implements Function {
035
036        public static boolean call(PageContext pc, Object xml) {
037            if(xml instanceof Node) return true;
038            
039            try {
040                XMLUtil.parse(new InputSource(new StringReader(Caster.toString(xml))),null,false);
041                return true;
042            }
043            catch(Exception e) {
044                    return false;
045            }
046        }
047}