org.yestech.jmlnitrate.transformation.outbound.HttpServletXSLTOutboundTransformation.java Source code

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Here is the source code for org.yestech.jmlnitrate.transformation.outbound.HttpServletXSLTOutboundTransformation.java

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/*
 * File name:           $RCSfile: $
 *
 * Revision:            $Revision: $
 * Last revised by:     $Author: $
 * Last revision date:  $Date: $
 *
 * Original Author:     Arthur Copeland
 *
 * Licensed using GPL Available - http://opensource.org/licenses/gpl-license.php
 *
 */
package org.yestech.jmlnitrate.transformation.outbound;

import javax.xml.transform.stream.StreamResult;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.yestech.jmlnitrate.handler.response.HttpServletResponseHandler;
import org.yestech.jmlnitrate.handler.response.ResponseHandler;

/**
 * This class represents an {@link OutboundTransformation} the transforms an XML
 * Document using XSLT.  This class is specifically for HTTP and is bound to 
 * {@link HttpServletResponseHandler}.
 *
 * @author Arthur Copeland
 * @version $Revision: 3 $
 *
 */
public class HttpServletXSLTOutboundTransformation extends BaseOutboundTransformation {
    //--------------------------------------------------------------------------
    // S T A T I C   V A R I A B L E S 
    //--------------------------------------------------------------------------
    /**
     * Holds the logger
     */
    final private static Log logger = LogFactory.getLog(HttpServletXSLTOutboundTransformation.class);

    /**
     * Delegate XSLTransformationEngine
     */
    private XSLTOutboundTransformation xsltTransform;

    //--------------------------------------------------------------------------
    // M E M B E R   V A R I A B L E S 
    //--------------------------------------------------------------------------

    //--------------------------------------------------------------------------
    // C O N S T R U C T O R S 
    //--------------------------------------------------------------------------
    /**
     * Default Ctor.
     */
    public HttpServletXSLTOutboundTransformation() {
        super();
        xsltTransform = new XSLTOutboundTransformation();
    }

    //--------------------------------------------------------------------------
    // O U T B O U N D T R A N S F O R M A T I O N   C O N T R A C T
    // M E T H O D S 
    //--------------------------------------------------------------------------
    /**
     * Transforms a {@link ResponseHandler} to a valid output format.
     *
     * @param response The Response to transform
     * @throws Exception if an error happens
     */
    public void transform(ResponseHandler response) throws Exception {
        Object xml = ((HttpServletResponseHandler) response).getValue(HttpServletResponseHandler.KEY_RESULT);
        String xsl = (String) (((HttpServletResponseHandler) response)
                .getValue(HttpServletResponseHandler.KEY_VIEW));

        //only transform if we are dealing with an xsl response view.
        if (xsl != null && !xsl.equals("") && xsl.endsWith(".xsl")) {
            StreamResult result = xsltTransform.transform(xml, xsl);
            setTransformationResult(result.getWriter().toString());
        }
    }
}