/*
 * 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.
 */
/*
 * $Id$
 */
package org.apache.qetest.xslwrapper;
import java.util.Properties;

import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.apache.qetest.QetestUtils;

/**
 * Implementation of TransformWrapper that uses the TrAX API and 
 * uses systemId URL's for it's sources; plus always transforms 
 * the xml file <b>three</b> times.
 *
 * This is the most common usage:
 * transformer = factory.newTransformer(new StreamSource(xslURL));
 * transformer.transform(new StreamSource(xmlURL), new StreamResult(resultFileName));
 *
 * <b>Important!</b>  The underlying System property of 
 * javax.xml.transform.TransformerFactory will determine the actual 
 * TrAX implementation used.  This value will be reported out in 
 * our getProcessorInfo() method.
 * 
 * @author Shane Curcuru
 * @version $Id$
 */
public class TraxSystemId3Wrapper extends TraxSystemIdWrapper
{

    /**
     * Get a general description of this wrapper itself.
     *
     * @return Uses TrAX to perform THREE transforms from StreamSource(systemId)
     */
    public String getDescription()
    {
        return "Uses TrAX to perform THREE transforms from StreamSource(systemId)";
    }


    /**
     * Get a specific description of the wrappered processor.  
     *
     * @return specific description of the underlying processor or 
     * transformer implementation: this should include both the 
     * general product name, as well as specific version info.  If 
     * possible, should be implemented without actively creating 
     * an underlying processor.
     */
    public Properties getProcessorInfo()
    {
        Properties p = TraxWrapperUtils.getTraxInfo();
        p.put("traxwrapper.method", "systemId3");
        p.put("traxwrapper.desc", getDescription());
        return p;
    }


    /**
     * Transform supplied xmlName file with the stylesheet in the 
     * xslName file into a resultName file <b>three</b> times.
     *
     * Names are assumed to be local path\filename references, and 
     * will be converted to URLs as needed for any underlying 
     * processor implementation.
     *
     * @param xmlName local path\filename of XML file to transform
     * @param xslName local path\filename of XSL stylesheet to use
     * @param resultName local path\filename to put result in
     *
     * @return array of longs denoting timing of only these parts of 
     * our operation: IDX_OVERALL, IDX_XSLBUILD, IDX_TRANSFORM
     *
     * @throws Exception any underlying exceptions from the 
     * wrappered processor are simply allowed to propagate; throws 
     * a RuntimeException if any other problems prevent us from 
     * actually completing the operation
     */
    public long[] transform(String xmlName, String xslName, String resultName)
        throws Exception
    {
        preventFootShooting();
        long startTime = 0;
        long xslBuild = 0;
        long transform = 0;
        
        // Timed: read/build xsl from a URL
        startTime = System.currentTimeMillis();
        Transformer transformer = factory.newTransformer(
                new StreamSource(QetestUtils.filenameToURL(xslName)));
        xslBuild = System.currentTimeMillis() - startTime;

        // Untimed: Set any of our options as Attributes on the transformer
        TraxWrapperUtils.setAttributes(transformer, newProcessorOpts);

        // Untimed: Apply any parameters needed
        applyParameters(transformer);

        // Timed: read/build xml, transform, and write results
        startTime = System.currentTimeMillis();
        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));
        transform = System.currentTimeMillis() - startTime;

        // Only time the first transform, but do two more
        // This is to test transformer re-use
        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                      new StreamResult(resultName));

        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                      new StreamResult(resultName));

        long[] times = getTimeArray();
        times[IDX_OVERALL] = xslBuild + transform;
        times[IDX_XSLBUILD] = xslBuild;
        times[IDX_TRANSFORM] = transform;
        return times;
    }


    /**
     * Transform supplied xmlName file with a pre-built/pre-compiled 
     * stylesheet into a resultName file <b>three</b> times.  
     *
     * User must have called buildStylesheet(xslName) beforehand,
     * obviously.
     * Names are assumed to be local path\filename references, and 
     * will be converted to URLs as needed.
     *
     * @param xmlName local path\filename of XML file to transform
     * @param resultName local path\filename to put result in
     *
     * @return array of longs denoting timing of only these parts of 
     * our operation: IDX_OVERALL, IDX_XSLBUILD, IDX_TRANSFORM
     *
     * @throws Exception any underlying exceptions from the 
     * wrappered processor are simply allowed to propagate; throws 
     * a RuntimeException if any other problems prevent us from 
     * actually completing the operation; throws an 
     * IllegalStateException if isStylesheetReady() == false.
     *
     * @see #buildStylesheet(String xslName)
     */
    public long[] transformWithStylesheet(String xmlName, String resultName)
        throws Exception
    {
        if (!isStylesheetReady())
            throw new IllegalStateException("transformWithStylesheet() when isStylesheetReady() == false");

        preventFootShooting();
        long startTime = 0;
        long transform = 0;
        
        // UNTimed: get Transformer from Templates
        Transformer transformer = builtTemplates.newTransformer();

        // Untimed: Set any of our options as Attributes on the transformer
        TraxWrapperUtils.setAttributes(transformer, newProcessorOpts);

        // Untimed: Apply any parameters needed
        applyParameters(transformer);

        // Timed: read/build xml, transform, and write results
        startTime = System.currentTimeMillis();
        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));
        transform = System.currentTimeMillis() - startTime;

        // Only time the first transform, but do two more
        // This is to test transformer re-use
        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));

        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));

        long[] times = getTimeArray();
        times[IDX_OVERALL] = transform;
        times[IDX_TRANSFORM] = transform;
        return times;
    }


    /**
     * Transform supplied xmlName file with a stylesheet found in an 
     * xml-stylesheet PI into a resultName file.
     *
     * Names are assumed to be local path\filename references, and 
     * will be converted to URLs as needed.  Implementations will 
     * use whatever facilities exist in their wrappered processor 
     * to fetch and build the stylesheet to use for the transform.
     *
     * @param xmlName local path\filename of XML file to transform
     * @param resultName local path\filename to put result in
     *
     * @return array of longs denoting timing of only these parts of 
     * our operation: IDX_OVERALL, IDX_XSLREAD (time to find XSL
     * reference from the xml-stylesheet PI), IDX_XSLBUILD, (time 
     * to then build the Transformer therefrom), IDX_TRANSFORM
     *
     * @throws Exception any underlying exceptions from the 
     * wrappered processor are simply allowed to propagate; throws 
     * a RuntimeException if any other problems prevent us from 
     * actually completing the operation
     */
    public long[] transformEmbedded(String xmlName, String resultName)
        throws Exception
    {
        preventFootShooting();
        long startTime = 0;
        long xslRead = 0;
        long xslBuild = 0;
        long transform = 0;
        
        // Timed: readxsl from the xml document
        startTime = System.currentTimeMillis();
        Source xslSource = factory.getAssociatedStylesheet(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                                                              null, null, null);
        xslRead = System.currentTimeMillis() - startTime;

        // Timed: build xsl from a URL
        startTime = System.currentTimeMillis();
        Transformer transformer = factory.newTransformer(xslSource);
        xslBuild = System.currentTimeMillis() - startTime;

        // Untimed: Set any of our options as Attributes on the transformer
        TraxWrapperUtils.setAttributes(transformer, newProcessorOpts);

        // Untimed: Apply any parameters needed
        applyParameters(transformer);

        // Timed: read/build xml, transform, and write results
        startTime = System.currentTimeMillis();
        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));
        transform = System.currentTimeMillis() - startTime;

        // Only time the first transform, but do two more
        // This is to test transformer re-use
        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));

        transformer.transform(new StreamSource(QetestUtils.filenameToURL(xmlName)), 
                              new StreamResult(resultName));

        long[] times = getTimeArray();
        times[IDX_OVERALL] = xslRead + xslBuild + transform;
        times[IDX_XSLREAD] = xslRead;
        times[IDX_XSLBUILD] = xslBuild;
        times[IDX_TRANSFORM] = transform;
        return times;
    }
}