001    /*
002    // $Id: //open/util/resgen/src/org/eigenbase/xom/wrappers/XercesDOMParser.java#4 $
003    // Package org.eigenbase.xom is an XML Object Mapper.
004    // Copyright (C) 2005-2005 The Eigenbase Project
005    // Copyright (C) 2005-2005 Disruptive Tech
006    // Copyright (C) 2005-2005 LucidEra, Inc.
007    // Portions Copyright (C) 2001-2005 Kana Software, Inc. and others.
008    //
009    // This library is free software; you can redistribute it and/or modify it
010    // under the terms of the GNU Lesser General Public License as published by the
011    // Free Software Foundation; either version 2 of the License, or (at your
012    // option) any later version approved by The Eigenbase Project.
013    //
014    // This library is distributed in the hope that it will be useful,
015    // but WITHOUT ANY WARRANTY; without even the implied warranty of
016    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017    // GNU Lesser General Public License for more details.
018    //
019    // You should have received a copy of the GNU Lesser General Public License
020    // along with this library; if not, write to the Free Software
021    // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
022    //
023    // klo, 1 August, 2001
024    */
025    
026    package org.eigenbase.xom.wrappers;
027    
028    import org.eigenbase.xom.DOMWrapper;
029    import org.eigenbase.xom.XOMException;
030    import org.apache.xerces.dom.DocumentImpl;
031    import org.apache.xerces.parsers.DOMParser;
032    import org.w3c.dom.Document;
033    import org.w3c.dom.Node;
034    import org.xml.sax.InputSource;
035    import org.xml.sax.SAXException;
036    
037    import java.io.IOException;
038    
039    /**
040     * This private helper class presents a GenericDOMParser using Xerces, with
041     * simple error handling appropriate for a testing environment.
042     */
043    
044    public class XercesDOMParser extends GenericDOMParser {
045        private DOMParser parser;
046    
047        /**
048         * Constructs a non-validating Xerces DOM Parser.
049         */
050        public XercesDOMParser() throws XOMException {
051            this(false);
052        }
053    
054        /**
055         * Constructs a Xerces DOM Parser.
056         * @param validate whether to enable validation
057         */
058        public XercesDOMParser(boolean validate) throws XOMException {
059            parser = new DOMParser();
060            try {
061                if (!validate) {
062                    parser.setFeature(VALIDATION_FEATURE, false);
063                    parser.setFeature(LOAD_EXTERNAL_DTD_FEATURE, false);
064                }
065            } catch (SAXException e) {
066                throw new XOMException(e, "Error setting up validation");
067            }
068    
069            parser.setErrorHandler(this);
070            document = new DocumentImpl();
071        }
072    
073        // implement GenericDOMParser
074        protected Document parseInputSource(InputSource in) throws XOMException {
075            prepareParse();
076            try {
077                parser.parse(in);
078            } catch (SAXException ex) {
079                // Display any pending errors
080                handleErrors();
081                throw new XOMException(ex, "Document parse failed");
082            } catch (IOException ex) {
083                // Display any pending errors
084                handleErrors();
085                throw new XOMException(ex, "Document parse failed");
086            }
087    
088            handleErrors();
089            return parser.getDocument();
090        }
091    
092        // implement Parser
093        public DOMWrapper create(String tagName) {
094            Node node = document.createElement(tagName);
095            return new W3CDOMWrapper(node, this);
096        }
097    }
098    
099    // End XercesDOMParser.java