org.eclipse.uomo.xml.impl.XMLReader.java Source code

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Here is the source code for org.eclipse.uomo.xml.impl.XMLReader.java

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/*******************************************************************************
 * Crown Copyright (c) 2006, 2007, Copyright (c) 2006, 2007 Jiva Medical.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *    Jiva Medical - initial API and implementation
 *******************************************************************************/

package org.eclipse.uomo.xml.impl;

import java.io.InputStream;

import javax.xml.parsers.SAXParserFactory;

import org.apache.commons.lang.StringUtils;
import org.eclipse.uomo.xml.XMLObjectParser;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class XMLReader extends DefaultHandler {

    private XMLObjectParsers stack = new XMLObjectParsers();
    private XMLObjectParser root;

    public XMLReader(XMLObjectParser handler) throws SAXException {
        super();
        root = handler;
    }

    private XMLObjectParser current() throws SAXException {
        return stack.current();
    }

    public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
        XMLObjectParser handler;
        String namespace;
        String name;
        if (uri == null || uri.equals("")) {
            namespace = "";
            name = qName;

        } else {
            namespace = uri;
            name = localName;
        }

        if (!stack.hasCurrent()) {
            if (root != null) {
                stack.push(root);
                root.setPath(name);
                root.start(namespace, name, "", atts);
                root = null;
                current().use();
            } else
                throw new SAXException("no handler available");
        } else {
            handler = current().startElement(namespace, name, "", atts);
            if (handler == null)
                current().use();
            else {
                handler.use();
                handler.setPath(current().getPath() + "\\" + name);
                handler.setNamespace(namespace);
                handler.setName(name);
                stack.push(handler);
                current().start(namespace, name, "", atts);
            }
        }
    }

    public void endElement(String uri, String localName, String qName) throws SAXException {
        String namespace;
        String name;
        if (uri == null || uri.equals("")) {
            namespace = "";
            name = qName;

        } else {
            namespace = uri;
            name = localName;
        }
        if (current().unUse()) {
            XMLObjectParser old = current();
            old.end();
            stack.pop();
            if (stack.hasCurrent())
                current().endChild(old);
        } else
            current().endElement(namespace, name);
    }

    public void characters(char[] ch, int start, int length) throws SAXException {
        current().findText(ch, start, length, StringUtils.isWhitespace(new String(ch, start, length)));
    }

    public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
        if (current().hasText())
            current().findText(ch, start, length, true);
    }

    public void parse(InputStream stream) throws SAXException {
        org.xml.sax.XMLReader xml;
        try {
            xml = SAXParserFactory.newInstance().newSAXParser().getXMLReader();
            xml.setFeature("http://xml.org/sax/features/namespaces", true);
            xml.setFeature("http://xml.org/sax/features/namespace-prefixes", false);
            xml.setContentHandler(this);
            xml.parse(new InputSource(stream));
        } catch (Exception e) {
            throw new SAXException(e);
        }
    }

}