samples/dom/wrappers/DOMParser.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999, 2000 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package dom.wrappers;

import dom.DOMParserWrapper;

import org.w3c.dom.Document;

import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;

/**
 * Wraps the Xerces DOM parser and extends NonValidatingDOMParser
 *
 * @version  $id$
 */
public class DOMParser 
    implements DOMParserWrapper, ErrorHandler {

    //
    // Data
    //



    /** Parser. */
    org.apache.xerces.parsers.DOMParser parser = 
        new org.apache.xerces.parsers.DOMParser();

    //
    // Constructors
    //

    /** Default constructor. */
    public DOMParser() {
        try {
            parser.setFeature( "http://xml.org/sax/features/validation", true);

        } catch (SAXException e) {
            System.out.println("error in setting up parser feature");
        }

        parser.setErrorHandler(this);

    }

    //
    // DOMParserWrapper methods
    //

    /** Parses the specified URI and returns the document. */
    public Document parse(String uri) throws Exception {
        parser.parse(uri);
        return parser.getDocument();

    } // parse(String):Document


    public void     setFeature(String featureId, boolean state)
            throws  SAXNotRecognizedException, SAXNotSupportedException {
            parser.setFeature( featureId, state );
    }


   
    //
    // ErrorHandler methods
    //

    /** Warning. */
    public void warning(SAXParseException ex) {
        System.err.println("[Warning] "+
                           getLocationString(ex)+": "+
                           ex.getMessage());
    }

    /** Error. */
    public void error(SAXParseException ex) {
        System.err.println("[Error] "+
                           getLocationString(ex)+": "+
                           ex.getMessage());
    }

    /** Fatal error. */
    public void fatalError(SAXParseException ex) throws SAXException {
        System.err.println("[Fatal Error] "+
                           getLocationString(ex)+": "+
                           ex.getMessage());
        throw ex;
    }

    //
    // Private methods
    //

    /** Returns a string of the location. */
    private String getLocationString(SAXParseException ex) {
        StringBuffer str = new StringBuffer();

        String systemId = ex.getSystemId();
        if (systemId != null) {
            int index = systemId.lastIndexOf('/');
            if (index != -1) 
                systemId = systemId.substring(index + 1);
            str.append(systemId);
        }
        str.append(':');
        str.append(ex.getLineNumber());
        str.append(':');
        str.append(ex.getColumnNumber());

        return str.toString();

    } // getLocationString(SAXParseException):String

} // class DOMParser