/*
 * Created on Apr 12, 2003
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
package net.raepple.plugin;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.swt.widgets.Shell;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

/**
 * @author raepple
 *
 * This class initializes the wizard and calculates the number of
 * elements when user clicked finish.
 * 
 */
public class XMLElementCountWizard extends Wizard
{
	private IFile xmlFile;
	private XMLElementCountPage page1;

	/**
	 * 
	 */
	public XMLElementCountWizard(IFile xmlFile)
	{
		super();
		setWindowTitle("XML Element Count Plugin");
		this.xmlFile = xmlFile;		
	}

	/**
	 * Adds pages to the wizard and initialize them.
	 * 
	 */	
	public void addPages() {
		page1 = new XMLElementCountPage();
		addPage(page1);
	}



	/* (non-Javadoc)
	 * @see org.eclipse.jface.wizard.IWizard#performFinish()
	 */
	public boolean performFinish()
	{
		int numberOfElements = 0;
		String errorMessage = "";
		
		// get XML Parser from JAXP factory
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		
		// configure factory
		factory.setValidating(false);		
		factory.setNamespaceAware(false);
		factory.setIgnoringComments(true);
				
		Shell shell = new Shell();				
				
		Document document = null;
		try
		{
			DocumentBuilder parser = factory.newDocumentBuilder();
			document = parser.parse(this.xmlFile.getContents());
		}
		catch (Exception e)
		{
			errorMessage = e.getMessage();
			IStatus status = new Status(IStatus.ERROR, XMLProcessing.PLUGIN_ID, 0, errorMessage, e);			
			ErrorDialog.openError(
				shell,
				"XML Element Count",
				"Exception occured: " + errorMessage,
				status);	
			
			return false;				
		}
		
		NodeList nodeList = document.getElementsByTagName(page1.getElementName());
		numberOfElements = nodeList.getLength();
					
		MessageDialog.openInformation(
			shell,
			"XML Element Count",
			"Elements with name " + page1.getElementName() + " found: " + numberOfElements);		
		
		return false;
	}

}