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
026package org.eigenbase.xom.wrappers;
027
028import org.eigenbase.xom.DOMWrapper;
029import org.eigenbase.xom.XOMException;
030import org.apache.xerces.dom.DocumentImpl;
031import org.apache.xerces.parsers.DOMParser;
032import org.w3c.dom.Document;
033import org.w3c.dom.Node;
034import org.xml.sax.InputSource;
035import org.xml.sax.SAXException;
036
037import 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
044public 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