/*
    * Copyright (c) 2005, The K-Wf Grid Consortium
    * Fraunhofer Institute for Computer Architecture and Software Technology
    * See http://www.kwfgrid.eu and http://www.first.fraunhofer.de for more details.
    */
   package net.kwfgrid.gwes.uiproxy;
   
   import java.util.Properties;
   
  import org.doomdark.uuid.UUIDGenerator;
  
  /**
     Default implementation of <code>BufferFactory</code>.   
   */
  public class DefaultBufferFactory implements BufferFactory {
      private static BufferFactory _i;
      
      /**
         Singleton pattern.
       */
      private DefaultBufferFactory() {
  	//
      }
  
      public synchronized static BufferFactory getInstance() {
  	if (_i==null) _i = new DefaultBufferFactory();
  	return _i;
      }
  
      /**
         Create a NotificationBuffer.
         @param type The type of the buffer; this must be the fully qualified java classname of the buffer's class. The class must be subclass of <code>AbstractBuffer</code>.
         @param props Properties that should be passed to the new buffer.
         @return The new buffer.
         @exception InstantiationException If the buffer could not be created.
       */
      public Buffer createBuffer(String type, Properties props) throws InstantiationException {
  	try {
  	    AbstractBuffer buffer = (AbstractBuffer)Class.forName(type).newInstance();
  	    buffer.setProperties(props);
  	    buffer.setID(UUIDGenerator.getInstance().generateRandomBasedUUID().toString());
  	    return buffer;
  	} catch (IllegalAccessException x) {
  	    InstantiationException ix = new InstantiationException("Instatiation of buffer failed.");
  	    ix.initCause(x);
  	    throw ix;
  	} catch (ClassNotFoundException x) {
  	    InstantiationException ix = new InstantiationException("Instatiation of buffer failed.");
  	    ix.initCause(x);
  	    throw ix;
  	} catch (ClassCastException x) {
  	    InstantiationException ix = new InstantiationException("Instatiation of buffer failed.");
  	    ix.initCause(x);
  	    throw ix;
  	} catch (BufferException x) {	    
  	    InstantiationException ix = new InstantiationException("Instatiation of buffer failed. Could not set properties of new instance.");
  	    ix.initCause(x);
  	    throw ix;
  	}
      }
  }