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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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/*
 * $Id: StAXValidatorHelper.java,v 1.6 2010-11-01 04:40:08 joehw Exp $
 * %W% %E%
 */
package com.sun.org.apache.xerces.internal.jaxp.validation;

import java.io.IOException;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.sax.SAXTransformerFactory;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;

import org.xml.sax.SAXException;

/**
 * A validator helper for StAXSources.
 *
 * @author Sunitha Reddy
 */
public final class StAXValidatorHelper implements ValidatorHelper {
    
    /** Component manager. **/
    private XMLSchemaValidatorComponentManager fComponentManager;
    
    private Transformer identityTransformer1 = null;
    private TransformerHandler identityTransformer2 = null;
    private ValidatorHandlerImpl handler = null;
    
    /** Creates a new instance of StaxValidatorHelper */
    public StAXValidatorHelper(XMLSchemaValidatorComponentManager componentManager) {
        fComponentManager = componentManager;
    }
    
    public void validate(Source source, Result result) 
        throws SAXException, IOException {
        
        if (result == null || result instanceof StAXResult) {
         
            if( identityTransformer1==null ) {
                try {
                    SAXTransformerFactory tf = (SAXTransformerFactory)SAXTransformerFactory.newInstance();
                    identityTransformer1 = tf.newTransformer();
                    identityTransformer2 = tf.newTransformerHandler();
                } catch (TransformerConfigurationException e) {
                    // this is impossible, but again better safe than sorry
                    throw new TransformerFactoryConfigurationError(e);
                }
            }

            handler = new ValidatorHandlerImpl(fComponentManager);
            if( result!=null ) {
                handler.setContentHandler(identityTransformer2);
                identityTransformer2.setResult(result);
            }

            try {
                identityTransformer1.transform( source, new SAXResult(handler) );
            } catch (TransformerException e) {
                if( e.getException() instanceof SAXException )
                    throw (SAXException)e.getException();
                throw new SAXException(e);
            } finally {
                handler.setContentHandler(null);
            }
            return;
        }
        throw new IllegalArgumentException(JAXPValidationMessageFormatter.formatMessage(fComponentManager.getLocale(),
                "SourceResultMismatch", 
                new Object [] {source.getClass().getName(), result.getClass().getName()}));
    }
}