RepeatElement.java

/**
Copyright (C) 2012  Delcyon, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.delcyon.capo.controller.elements;

import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import com.delcyon.capo.CapoApplication;
import com.delcyon.capo.controller.AbstractControl;
import com.delcyon.capo.controller.ControlElementProvider;
import com.delcyon.capo.xml.XPath;

/**
 * @author jeremiah
 *
 */

@ControlElementProvider(name="repeat")
public class RepeatElement extends AbstractControl 
{

	
	private enum Attributes
	{
		nodeset,indexVar
	}
	
	private static final String[] supportedNamespaces = {CapoApplication.SERVER_NAMESPACE_URI};
	
	@Override
	public Attributes[] getAttributes()
	{
		return Attributes.values();
	}
	
	@Override
	public Attributes[] getRequiredAttributes()
	{
		return new Attributes[]{Attributes.nodeset};
	}

	
	@Override
	public String[] getSupportedNamespaces()
	{
		return supportedNamespaces;
	}

//	private static final String[] functionNames = {"context"};
//	
//	@Override
//	public String[] getXPathFunctionNames()
//	{
//		return functionNames;
//	}
//	
//	@Override
//	public String processFunction(String prefix, String functionName, String... arguments)
//	{
//		if (functionName.equals("context"))
//		{
//			try
//			{
//				return XPath.getXPath(currentContext);
//			} catch (Exception e)
//			{
//				// TODO Auto-generated catch block
//				e.printStackTrace();
//				return null;
//			}
//		}
//		else
//		{
//			return null;
//		}
//	}
//	
//	private Node currentContext = null;

	
	
	@Override
	public Object processServerSideElement() throws Exception
	{
		
	
		String nodeset = getAttributeValue(Attributes.nodeset);		
		String indexVar = getAttributeValue(Attributes.indexVar);		
		if (indexVar == null || indexVar.isEmpty())
		{
			indexVar = "index";
		}
		
		

		NodeList nodeList = XPath.selectNodes(getControlElementDeclaration(), nodeset);
		for(int index = 0; index < nodeList.getLength(); index++)
		{
		    //make a copy of the original Element
		    Element originalElement = getControlElementDeclaration();
			Element tempGroupElement = (Element) originalElement.cloneNode(true);
			
			//replace the current element with the temp element, this is so out of context xpaths will still work
			originalElement.getParentNode().replaceChild(tempGroupElement, originalElement);
			
			GroupElement groupElement = new GroupElement();			
			groupElement.init(tempGroupElement, groupElement, getParentGroup(), getControllerClientRequestProcessor());	
			groupElement.getGroup().set(indexVar, index+"");
			groupElement.getGroup().set("context", XPath.getXPath(nodeList.item(index)));		
			groupElement.processServerSideElement();
			
			//once we're done, switch them back
			tempGroupElement.getParentNode().replaceChild(originalElement, tempGroupElement);
			
		}
		return null;
	}

}