package com.c2kernel.lifecycle.instance.predefined;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.xml.serialize.Method;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
import org.xml.sax.InputSource;
import com.c2kernel.lifecycle.instance.Activity;
import com.c2kernel.utils.Logger;
/***********************************************************************************************************************************************************************************************************************************************************************************************************
 * @author $Author: sgaspard $ $Date: 2004/09/21 10:32:17 $
 * @version $Revision: 1.14 $
 **********************************************************************************************************************************************************************************************************************************************************************************************************/
public class PredefinedStep extends Activity
{
	/*******************************************************************************************************************************************************************************************************************************************************************************************************
	 * predefined Steps are always Active, and have only one transition subclasses could override this method (if necessary)
	 ******************************************************************************************************************************************************************************************************************************************************************************************************/
	private boolean isPredefined = false;
	public boolean getActive()
	{
		if (isPredefined)
			return true;
		else
			return super.getActive();
	}
	public String getTransitions()
	{
		if (isPredefined)
			return "<PossibleTransitions>done</PossibleTransitions>";
		else
			return super.getTransitions();
	}
	public String getErrors()
	{
		if (isPredefined)
			return getName();
		else
			return super.getErrors();
	}
	public boolean verify()
	{
		if (isPredefined)
			return true;
		else
			return super.verify();
	}
	/**
	 * Returns the isPredefined.
	 * 
	 * @return boolean
	 */
	public boolean getIsPredefined()
	{
		return isPredefined;
	}
	/**
	 * Sets the isPredefined.
	 * 
	 * @param isPredefined
	 *            The isPredefined to set
	 */
	public void setIsPredefined(boolean isPredefined)
	{
		this.isPredefined = isPredefined;
	}
	public String getType()
	{
		return getName();
	}
	// generic bundling of parameters
	static public String bundleData(String[] data)
	{
		try
		{
			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
			DocumentBuilder builder = factory.newDocumentBuilder();
			Document dom = builder.newDocument();
			Element root = dom.createElement("PredefinedStepOutcome");
			dom.appendChild(root);
			for (int i = 0; i < data.length; i++)
			{
				Element param = dom.createElement("param");
				Text t = dom.createTextNode(data[i]);
				param.appendChild(t);
				root.appendChild(param);
			}
            // xalan method - use internal xerces one instead
//			TransformerFactory transFactory = TransformerFactory.newInstance();
//			Transformer transformer = transFactory.newTransformer();
//			StringWriter stringOut = new StringWriter();
//			transformer.transform(new DOMSource(dom), new StreamResult(stringOut));
//			return stringOut.toString();

            OutputFormat format = new OutputFormat(Method.XML, null, false);
            StringWriter stringOut = new StringWriter();
            XMLSerializer serial = new XMLSerializer(stringOut, format);
            serial.asDOMSerializer();
            serial.serialize(dom);            
            return stringOut.toString();
		}
		catch (Exception e)
		{
            Logger.error(e);
			StringBuffer xmlData = new StringBuffer().append("<PredefinedStepOutcome>");
			for (int i = 0; i < data.length; i++)
				xmlData.append("<param><![CDATA[").append(data[i]).append("]]></param>");
			xmlData.append("</PredefinedStepOutcome>");
			return xmlData.toString();
		}
	}
	// generic bundling of single parameter
	static public String bundleData(String data)
	{
		return "<PredefinedStepOutcome><param><![CDATA[" + data + "]]></param></PredefinedStepOutcome>";
	}
	static public String[] getDataList(String xmlData)
	{
		try
		{
			Document scriptDoc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new InputSource(new StringReader(xmlData)));
			NodeList nodeList = scriptDoc.getElementsByTagName("param");
			String[] result = new String[nodeList.getLength()];
			for (int i = 0; i < nodeList.getLength(); i++)
            {      
                Node n = nodeList.item(i).getFirstChild();
                if (n instanceof CDATASection)
                	result[i] = ((CDATASection) n).getData();
                else if (n instanceof Text)
                    result[i] = ((Text) n).getData();
            }
			return result;
		}
		catch (Exception ex)
		{
			Logger.error("Exception::PredefinedStep::getDataList()");
			Logger.error(ex);
		}
		return null;
	}
}