org.apache.jackrabbit.commons.xml.ParsingContentHandler Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.commons.xml;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* Utility class that decorates a {@link ContentHandler} instance with
* simple XML parsing capability.
*
* @since Jackrabbit JCR Commons 1.5
*/
public class ParsingContentHandler extends DefaultContentHandler {
/**
* Creates a {@link DefaultHandler} adapter for the given content
* handler.
*
* @param handler content handler
*/
public ParsingContentHandler(ContentHandler handler) {
super(handler);
}
/**
* Utility method that parses the given input stream using this handler.
* The parser is namespace-aware and will not resolve external entity
* references.
*
* @param in XML input stream
* @throws IOException if an I/O error occurs
* @throws SAXException if an XML parsing error occurs
*/
public void parse(InputStream in) throws IOException, SAXException {
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
factory.newSAXParser().parse(new InputSource(in), this);
} catch (ParserConfigurationException e) {
throw new SAXException("SAX parser configuration error", e);
}
}
/**
* Returns an empty stream to prevent the XML parser from attempting
* to resolve external entity references.
*/
public InputSource resolveEntity(String publicId, String systemId)
throws SAXException {
return new InputSource(new ByteArrayInputStream(new byte[0]));
}
}