/* Copyright (c) 2006-2007, Vladimir Nikic
All rights reserved.
Redistribution and use of this software in source and binary forms,
with or without modification, are permitted provided that the following
conditions are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
* 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.
* The name of Web-Harvest may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
You can contact Vladimir Nikic by sending e-mail to
nikic_vladimir@yahoo.com. Please include the word "Web-Harvest" in the
subject line.
*/
package org.webharvest.definition;
import org.apache.log4j.Logger;
import org.webharvest.exception.ParserException;
import org.webharvest.utils.Stack;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.LocatorImpl;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.util.StringTokenizer;
public class XmlParser extends DefaultHandler {
protected static Logger log = Logger.getLogger(XmlParser.class);
XmlNode root;
// working stack of elements
private transient Stack elementStack = new Stack();
private Locator locator;
public static XmlNode parse(InputSource in) {
long startTime = System.currentTimeMillis();
XmlParser handler = new XmlParser();
try {
SAXParserFactory parserFactory = SAXParserFactory.newInstance();
parserFactory.setValidating(false);
parserFactory.setNamespaceAware(false);
SAXParser parser = parserFactory.newSAXParser();
// call parsing
parser.parse(in, handler);
log.info("XML parsed in " + (System.currentTimeMillis() - startTime) + "ms.");
} catch (Exception e) {
throw new ParserException(e.getMessage(), e);
}
return handler.root;
}
public XmlParser() {
this.setDocumentLocator(new LocatorImpl());
}
public void setDocumentLocator(Locator locator) {
this.locator = locator;
}
private XmlNode getCurrentNode() {
return elementStack.size() > 0 ? (XmlNode) elementStack.peek() : null;
}
public void characters(char[] ch, int start, int length) throws SAXException {
XmlNode currNode = getCurrentNode();
if (currNode != null) {
currNode.addElement( new String(ch, start, length) );
}
}
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
XmlNode currNode = getCurrentNode();
XmlNode newNode = new XmlNode(qName, currNode);
newNode.setLocation( this.locator.getLineNumber(), this.locator.getColumnNumber() );
elementStack.push(newNode);
if (currNode == null) {
root = newNode;
}
int attsCount = attributes.getLength();
for (int i = 0; i < attsCount; i++) {
newNode.addAttribute( attributes.getQName(i), attributes.getValue(i) );
}
}
public void endElement(String uri, String localName, String qName) throws SAXException {
if (elementStack.size() > 0) {
getCurrentNode().flushText();
elementStack.pop();
}
}
}