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/*
* 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.
*/
/*
* $Id: ValidateXMLInput.java 470245 2006-11-02 06:34:33Z minchau $
*/
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
/**
* Validate the XML input by using SAXParserFactory to turn on namespace awareness and
* validation, and a SAX XMLReader to parse the input and report problems to an error
* handler.
*
* This sample uses birds.xml with an internal DOCTYPE declaration. As shipped, birds.xml
* contains an element that violates the declared document type.
*/
public class ValidateXMLInput
{
public static void main(String[] args)
throws Exception
{
ValidateXMLInput v = new ValidateXMLInput();
v.validate();
}
void validate()
throws Exception
{
// Since we're going to use a SAX feature, the transformer must support
// input in the form of a SAXSource.
TransformerFactory tfactory = TransformerFactory.newInstance();
if(tfactory.getFeature(SAXSource.FEATURE))
{
// Standard way of creating an XMLReader in JAXP 1.1.
SAXParserFactory pfactory= SAXParserFactory.newInstance();
pfactory.setNamespaceAware(true); // Very important!
// Turn on validation.
pfactory.setValidating(true);
// Get an XMLReader.
XMLReader reader = pfactory.newSAXParser().getXMLReader();
// Instantiate an error handler (see the Handler inner class below) that will report any
// errors or warnings that occur as the XMLReader is parsing the XML input.
Handler handler = new Handler();
reader.setErrorHandler(handler);
// Standard way of creating a transformer from a URL.
Transformer t = tfactory.newTransformer(
new StreamSource("birds.xsl"));
// Specify a SAXSource that takes both an XMLReader and a URL.
SAXSource source = new SAXSource(reader,
new InputSource("birds.xml"));
// Transform to a file.
try
{
t.transform(source, new StreamResult("birds.out"));
}
catch (TransformerException te)
{
// The TransformerException wraps someting other than a SAXParseException
// warning or error, either of which should be "caught" by the Handler.
System.out.println("Not a SAXParseException warning or error: " + te.getMessage());
}
System.out.println("=====Done=====");
}
else
System.out.println("tfactory does not support SAX features!");
}
// Catch any errors or warnings from the XMLReader.
class Handler extends DefaultHandler
{
public void warning (SAXParseException spe)
throws SAXException
{
System.out.println("SAXParseException warning: " + spe.getMessage());
}
public void error (SAXParseException spe)
throws SAXException
{
System.out.println("SAXParseException error: " + spe.getMessage());
}
}
}
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