Set Button Image via sclass in Java dynamically

Image image = new Image();
image.setSclass("imageSclass");

Button button = new Button();
button.setLabel("test");
button.setOrient("vertical");
button.setImageContent(image.getContent());

	<system-property>
	    <name>ipadStyleSheet</name>    
	    <value>/stylesheets/dhIpadStyleSheet.css</value>    
	</system-property> 
	<system-property>
	    <name>desktopStyleSheet</name>    
	    <value>/stylesheets/dhDesktopStyleSheet.css</value>    
	</system-property> 

@import "/dhuiipad/stylesheets/dhAudioStyleSheetIpad.css";
@import "/dhuiipad/stylesheets/dhNotificationsStyleSheetIpad.css";
@import "/dhuiipad/stylesheets/dhUserStyleSheetIpad.css";
@import "/dhuiipad/stylesheets/dhSystemStyleSheetIpad.css";
@import "/dhuiipad/stylesheets/dhHeaderStyleSheetIpad.css";
@import "/dhuiipad/stylesheets/dhAlertStyleSheetIpad.css"; 
@import "/dhuiipad/stylesheets/dhComponentsStyleSheetIpad.css"; 
@import "/dhuiipad/stylesheets/dhZoneIconsStyleSheetIpad.css";
@import "/dhuiipad/stylesheets/dhVideoStyleSheetIpad.css";  
@import "/dhuiipad/stylesheets/dhTextFontsStyleSheetIpad.css";

/**
 * 
 */
package com.dh.ui.common.css;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Vector;

import org.apache.commons.io.IOUtils;


/**
 * @author ansancle
 *
 */
public class DHzCssImageMapper
{	
	private static Collection<DHzStyleEntryHolder> _sheetEntries = new ArrayList<DHzStyleEntryHolder>();
	private static Map<String,String> _cssImageMap = new HashMap<String,String>();
	
	
	/**
	 * 
	 * Method : getImagePathFromSclass
	 *
	 * @param sclass
	 * @return
	 */
	public String getImagePathFromSclass(String sclass)
	{
		String path = _cssImageMap.get(sclass);
		if (path == null)
			path = "";
		return path;
	}
	
	
	/**
	 * 
	 * Method : openAndLoadAllStyleSheetsFromParent
	 * 
	 *  this will load the root style sheet which lists all the other stylesheets.
	 *  It will then go through all of those and load the .dh styles into a map.
	 *
	 * @param zkSession
	 * 
	 */
	public static void openAndLoadAllStyleSheetsFromParent(String styleSheetUrl,String hostName,String styleSheet) throws Exception
	{
		// It's already loaded, no need to do it again.
		if (_cssImageMap.size() > 0)
			return;
		
		String parentSheetUrl = styleSheetUrl + styleSheet;
		
		
		URL url = new URL(parentSheetUrl);
		String rootSheetContents = IOUtils.toString(url.openStream());
		InputStream inputStream = IOUtils.toInputStream(rootSheetContents);
		BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));	
				
		// at this point we have a string containing all the the stylesheets defined in the parent style sheet
		// Ex. 
		// @import "/dhuiipad/stylesheets/dhAudioStyleSheetDesktop.css";
		// @import "/dhuiipad/stylesheets/dhNotificationsStyleSheetDesktop.css";
		
		Collection<String> cssFileUrls = new Vector<String>();
		
		 String line;
		 while ((line = br.readLine()) != null) 
		 {
			 int indexOfFirstSlash = line.indexOf("/");
			 line = line.substring(indexOfFirstSlash); // should be -> /dhuiipad/stylesheets/dhAudioStyleSheetDesktop.css";
			 int indexOfQuote = line.indexOf("\"");
			 line = line.substring(0,indexOfQuote); // should be -> /dhuiipad/stylesheets/dhAudioStyleSheetDesktop.css
			 String sheetUrl = "http://" + hostName + line;
			 cssFileUrls.add(sheetUrl);
		 }

		 Iterator<String> it = cssFileUrls.iterator();
		 while (it.hasNext())
		 {
			 String sheetName = it.next();
			 URL sheetUrl = new URL(sheetName);
			 String contents = IOUtils.toString(sheetUrl.openStream());
			 InputStream sheetInputStream = IOUtils.toInputStream(contents);
			 BufferedReader sheetInputBr = new BufferedReader(new InputStreamReader(sheetInputStream));	
			 while ((line = sheetInputBr.readLine()) != null) 
			 {
				 getCssEntry(line,sheetInputBr);
			 }
		 }
		 
		 
		 Iterator<DHzStyleEntryHolder> holderIts = _sheetEntries.iterator();
		 while (holderIts.hasNext())
		 {
			 DHzStyleEntryHolder holder = holderIts.next();
			 String imagePath = holder.getImagePath();
			 if (imagePath != null)
			 {
				 _cssImageMap.put(holder.getName(),imagePath);
				 System.out.println("Name = " + holder.getName() + " Path = " + imagePath);
			 }
		 }
		 
	}
	
	/**
	 * 
	 * Method : getCssEntryStart
	 *
	 * @param line
	 * @param br
	 * @throws Exception
	 */
	private static void getCssEntry(String line, BufferedReader br) throws Exception
	{
		// Get the next entry
		while ((line != null) && (line.contains(".dh") == false))
		{
			line = br.readLine();
		}
		// If we are here we have either got to the end of the file or we have found an entry
		if (line == null)
			return;
		
		DHzStyleEntryHolder entry = new DHzStyleEntryHolder();
		Collection<String> body = new ArrayList<String>();
		int indexofDot = line.indexOf(".");
		line = line.substring(indexofDot + 1);
		entry.setName(line);
		
		boolean bDone=false;
		
		while ((bDone == false) && (line != null))
		{
			line = br.readLine();
			body.add(line);
			if ((line.contains("}") == true))
			{
				bDone = true;
			}
		}
		// If we did not find the end brace but reached the end of the file we have an improprer entry in the style sheet.
		if ((bDone == false) && (line == null))
			throw new Exception("Did not find end of Style Entry before getting to end of file");
		
		entry.setBody(body);	
		_sheetEntries.add(entry);
	}

}

/**
 * Digital Home - Digital Health Systems Copyright 2005-2012
 * Date Created : Sep 22, 2011
 * Created By : ansancle
 * Package Name : com.dh.ui.common.css
 * File Name : DHzStyleEntryHolder.java
 *   
 *
 */
package com.dh.ui.common.css;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

/**
 * @author ansancle
 *
 */
public class DHzStyleEntryHolder implements Comparable<DHzStyleEntryHolder>
{	


	private String _name;
	private Collection<String> _body = new ArrayList<String>();
	private String _imagePath;
	
	/**
	 *  Method : compareTo
	 *
	 * (non-Javadoc)
	 * @see java.lang.Comparable#compareTo(java.lang.Object)
	 */
	@Override
	public int compareTo(DHzStyleEntryHolder object)
	{
		return _name.compareTo(object.getName());
	}
	
	/**
	 * 
	 * Method : setName
	 *
	 * @param name
	 */
	public void setName(String name)
	{
		_name = name;
	}
	
	/**
	 * 
	 * Method : getName
	 *
	 * @return
	 */
	public String getName()
	{
		return _name;
	}
	
	/**
	 * 
	 * Method : setBody
	 *
	 * @param body
	 */
	public void setBody(Collection<String> body)
	{
		_body = body;
	}
	
	/**
	 * 
	 * Method : getBody
	 *
	 * @return
	 */
	public Collection<String> getBody()
	{
		return _body;
	}
	
	/**
	 * 
	 * Method : getImagePath
	 *
	 *	Returns either imagePath or null if not an image entry
	 *
	 * @return
	 */
	public String getImagePath()
	{
		Iterator<String> it = _body.iterator();
		while (it.hasNext())
		{
			String line = it.next();
			if (line.contains("background: URL(") == true)
			{
				int index = line.indexOf(".");
				index = index + 1;
				line = line.substring(index);
				index = line.indexOf(")");
				line = line.substring(0,index);
				_imagePath = "/stylesheets" + line;
				return _imagePath;
			}
		}

		return null;
	}
	
	
}

	@Override
	public void init(Session session, Object request) throws Exception
	{
		
		javax.servlet.http.HttpServletRequest servletRequest = (javax.servlet.http.HttpServletRequest)request;
		String browserType = servletRequest.getHeader("User-Agent");		
		if ((browserType.indexOf(DHnSessionArguments.iPad.toString()) != -1) || (browserType.indexOf(DHnSessionArguments.iPhone.toString()) != -1))
	    {
			session.setAttribute(DHnSessionArguments.browserType.toString(), DHnPageArguments.iPad.toString());			
	    }	
		else
		{
			String remoteHostName = servletRequest.getRemoteHost();
			InetAddress inetAddress = InetAddress.getByName(remoteHostName);  
			String hostName = inetAddress.getHostName();	
			String styleSheet = DHzZKUtilities.getStyleSheetForBrowser(session, browserType);
			String styleSheetUrl = "http://" +  hostName + "/dhuiipad";
			// THIS CALL IS WHAT READS AND LOADS ALL THE STYLES into a static map - AFTER THIS CALL 
			// DHzCssImageMapper.getImagePathFromSclass(sclass) can be used to get an image Path
			DHzCssImageMapper.openAndLoadAllStyleSheetsFromParent(styleSheetUrl,hostName,styleSheet);
		}
	}