ValidateXMLInput.java Source code

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Here is the source code for ValidateXMLInput.java

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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());
        }
    }
}