Graph Script Code

package ls.util;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import ls.util.msg.ErrorHandler;
import ls.util.msg.IOStreamErrorHandler;
import ls.util.msg.IOStreamMessageHandler;
import ls.util.msg.MessageHandler;
import ls.util.msg.MessageManager;

/*
 * Created on 07/06/2004
 */

/**
 * 
 * 
 * @author Lior Schejter
 */
public class Utils
{
	
	private static MessageManager messageManager = new MessageManager();
//   private static IOStreamErrorHandler errorHandler = new IOStreamErrorHandler("ls");
//   private static IOStreamMessageHandler msgHandler = new IOStreamMessageHandler();
   
   public static void addMessageHandler(MessageHandler handler)
   {
	   if (handler == null) return;
	   messageManager.registerMessageHandler(handler);
   }
   
   public static void addErrorHandler(ErrorHandler eh)
   {
	   if (eh == null) return;
	   messageManager.registerErrorHandler(eh);
   }
   /* (non-Javadoc)
    * @see ls.util.msg.ErrorHandler#handleException(java.lang.Exception)
    */
   public static void exn(Exception exn)
   {
      messageManager.exn(exn);
   }
   
   public static void err(String errMsg)
   {
	   messageManager.err("Error: " + errMsg);
   }
   
   /* (non-Javadoc)
    * @see ls.util.msg.MessageHandler#handleMsg(java.lang.String)
    */
   public static void msg(String _msg)
   {
	   messageManager.msg(_msg);
   }
   public static final String EMPTY_STRING = "";
   
   /**
    * Return a new collection, with all the elements in the given iterator
    * @param iter
    * @return
    */
   public static <E> Collection<E> collectionFromIterator(Iterator<E> iter)
   {
      Collection<E> ret = new ArrayList<E>();
      if (iter != null)
      {
         for (;iter.hasNext();)
         {
            ret.add(iter.next());
         }
      }
      return ret;
   }
   
   /**
    * Add the elments provided by the given iterator to the given collection
    * @param coll
    * @param iter
    */
   public static <E> void addToCollection(Collection<E> coll,Iterator<? extends E> iter)
   {
      if (coll == null || iter == null) return;
      for (; iter.hasNext();)
         coll.add(iter.next());
   }
   
   public static String fileExtension(File f) throws IOException
   {
	   if (f == null) return null;
	   String filename = f.getCanonicalPath();
	   int lastDotInd = filename.lastIndexOf('.');
	   if (lastDotInd < 0) return "";
	   return filename.substring(lastDotInd+1);
   }
}