filter.java

wekaUT是 university texas austin 开发的基于weka的半指导学习(semi supervised learning)的分类器

		ex.printStackTrace();
	      } finally {
		m_visual.setText(oldText);
		m_visual.setStatic();
		m_state = IDLE;
		if (isInterrupted()) {
		  m_trainingSet = null;
		  if (m_log != null) {
		    m_log.logMessage("Filter test set interrupted!");
		    m_log.statusMessage("OK");
		  }
		}
		block(false);
	      }
	    }
	  };
	m_filterThread.setPriority(Thread.MIN_PRIORITY);
	m_filterThread.start();
	block(true);
	m_filterThread = null;
	m_state = IDLE;
      } catch (Exception ex) {
	ex.printStackTrace();
      }
    }
  }

  /**
   * Accept a data set
   *
   * @param e a <code>DataSetEvent</code> value
   */
  public void acceptDataSet(DataSetEvent e) {
    processTrainingOrDataSourceEvents(e);
  }

  /**
   * Set the visual appearance of this bean
   *
   * @param newVisual a <code>BeanVisual</code> value
   */
  public void setVisual(BeanVisual newVisual) {
    m_visual = newVisual;
  }

  /**
   * Get the visual appearance of this bean
   *
   * @return a <code>BeanVisual</code> value
   */
  public BeanVisual getVisual() {
    return m_visual;
  }

  /**
   * Use the default visual appearance
   */
  public void useDefaultVisual() {
    m_visual.loadIcons(BeanVisual.ICON_PATH+"DefaultFilter.gif",
		       BeanVisual.ICON_PATH+"DefaultFilter_animated.gif");
  }

  /**
   * Add a training set listener
   *
   * @param tsl a <code>TrainingSetListener</code> value
   */
  public synchronized void addTrainingSetListener(TrainingSetListener tsl) {
    m_trainingListeners.addElement(tsl);
  }
  
  /**
   * Remove a training set listener
   *
   * @param tsl a <code>TrainingSetListener</code> value
   */
  public synchronized void removeTrainingSetListener(TrainingSetListener tsl) {
     m_trainingListeners.removeElement(tsl);
  }

  /**
   * Add a test set listener
   *
   * @param tsl a <code>TestSetListener</code> value
   */
  public synchronized void addTestSetListener(TestSetListener tsl) {
    m_testListeners.addElement(tsl);
  }
  
  /**
   * Remove a test set listener
   *
   * @param tsl a <code>TestSetListener</code> value
   */
  public synchronized void removeTestSetListener(TestSetListener tsl) {
    m_testListeners.removeElement(tsl);
  }

  /**
   * Add a data source listener
   *
   * @param dsl a <code>DataSourceListener</code> value
   */
  public synchronized void addDataSourceListener(DataSourceListener dsl) {
    m_dataListeners.addElement(dsl);
  }

  /**
   * Remove a data source listener
   *
   * @param dsl a <code>DataSourceListener</code> value
   */
  public synchronized void removeDataSourceListener(DataSourceListener dsl) {
    m_dataListeners.remove(dsl);
  }

  /**
   * Add an instance listener
   *
   * @param tsl an <code>InstanceListener</code> value
   */
  public synchronized void addInstanceListener(InstanceListener tsl) {
    m_instanceListeners.addElement(tsl);
  }

  /**
   * Remove an instance listener
   *
   * @param tsl an <code>InstanceListener</code> value
   */
  public synchronized void removeInstanceListener(InstanceListener tsl) {
    m_instanceListeners.removeElement(tsl);
  }

  private void notifyDataOrTrainingListeners(EventObject ce) {
    Vector l;
    synchronized (this) {
      l = (ce instanceof TrainingSetEvent)
	? (Vector)m_trainingListeners.clone()
	: (Vector)m_dataListeners.clone();
    }
    if (l.size() > 0) {
      for(int i = 0; i < l.size(); i++) {
	if (ce instanceof TrainingSetEvent) {
	  ((TrainingSetListener)l.elementAt(i)).
	    acceptTrainingSet((TrainingSetEvent)ce);
	} else {
	  ((DataSourceListener)l.elementAt(i)).acceptDataSet((DataSetEvent)ce);
	}
      }
    }
  }

  private void notifyTestListeners(TestSetEvent ce) {
    Vector l;
    synchronized (this) {
      l = (Vector)m_testListeners.clone();
    }
    if (l.size() > 0) {
      for(int i = 0; i < l.size(); i++) {
	((TestSetListener)l.elementAt(i)).acceptTestSet(ce);
      }
    }
  }

  protected void notifyInstanceListeners(InstanceEvent tse) {
    Vector l;
    synchronized (this) {
      l = (Vector)m_instanceListeners.clone();
    }
    if (l.size() > 0) {
      for(int i = 0; i < l.size(); i++) {
	//	System.err.println("Notifying instance listeners "
	//			   +"(Filter)");
	((InstanceListener)l.elementAt(i)).acceptInstance(tse);
      }
    }
  }
  
  /**
   * Returns true if, at this time, 
   * the object will accept a connection with respect to the supplied
   * event name
   *
   * @param eventName the event
   * @return true if the object will accept a connection
   */
  public boolean connectionAllowed(String eventName) {

    if (m_listenees.containsKey(eventName)) {
      return false;
    }

    /* reject a test event if we don't have a training or data set event
    if (eventName.compareTo("testSet") == 0) {
      if (!m_listenees.containsKey("trainingSet") &&
	  !m_listenees.containsKey("dataSet")) {
	return false;
      }
      } */
    
    // will need to reject train/test listener if we have a
    // data source listener and vis versa
    if (m_listenees.containsKey("dataSet") &&
	(eventName.compareTo("trainingSet") == 0 ||
	 eventName.compareTo("testSet") == 0 ||
	eventName.compareTo("instance") == 0)) {
      return false;
    }

    if ((m_listenees.containsKey("trainingSet") ||
	 m_listenees.containsKey("testSet")) &&
	(eventName.compareTo("dataSet") == 0 || 
	eventName.compareTo("instance") == 0)) {
      return false;
    }

    if (m_listenees.containsKey("instance") &&
	(eventName.compareTo("trainingSet") == 0 ||
	 eventName.compareTo("testSet") == 0 ||
	 eventName.compareTo("dataSet") == 0)) {
      return false;
    }

    // reject an instance event connection if our filter isn't
    // streamable
    if (eventName.compareTo("instance") == 0 &&
	!(m_Filter instanceof StreamableFilter)) {
      return false;
    }
    return true;
  }

  /**
   * Notify this object that it has been registered as a listener with
   * a source with respect to the supplied event name
   *
   * @param eventName
   * @param source the source with which this object has been registered as
   * a listener
   */
  public synchronized void connectionNotification(String eventName,
						  Object source) {
    if (connectionAllowed(eventName)) {
      m_listenees.put(eventName, source);
    }
  }

  /**
   * Notify this object that it has been deregistered as a listener with
   * a source with respect to the supplied event name
   *
   * @param eventName the event
   * @param source the source with which this object has been registered as
   * a listener
   */
  public synchronized void disconnectionNotification(String eventName,
						     Object source) {
    m_listenees.remove(eventName);
  }

  /**
   * Function used to stop code that calls acceptTrainingSet, acceptTestSet,
   * or acceptDataSet. This is 
   * needed as filtering is performed inside a separate
   * thread of execution.
   *
   * @param tf a <code>boolean</code> value
   */
  private synchronized void block(boolean tf) {
    if (tf) {
      try {
	// only block if thread is still doing something useful!
	if (m_filterThread.isAlive() && m_state != IDLE) {
	  wait();
	}
      } catch (InterruptedException ex) {
      }
    } else {
      notifyAll();
    }
  }

  /**
   * Stop all action if possible
   */
  public void stop() {
    // tell all listenees (upstream beans) to stop
    Enumeration en = m_listenees.keys();
    while (en.hasMoreElements()) {
      Object tempO = m_listenees.get(en.nextElement());
      if (tempO instanceof BeanCommon) {
	System.err.println("Listener is BeanCommon");
	((BeanCommon)tempO).stop();
      }
    }
    
    //
  }
  
  /**
   * Set a logger
   *
   * @param logger a <code>Logger</code> value
   */
  public void setLog(Logger logger) {
    m_log = logger;
  }

  /**
   * Return an enumeration of user requests
   *
   * @return an <code>Enumeration</code> value
   */
  public Enumeration enumerateRequests() {
    Vector newVector = new Vector(0);
    if (m_filterThread != null) {
      newVector.addElement("Stop");
    }
    return newVector.elements();
  }

  /**
   * Perform the named request
   *
   * @param request a <code>String</code> value
   * @exception IllegalArgumentException if an error occurs
   */
  public void performRequest(String request) throws IllegalArgumentException {
    if (request.compareTo("Stop") == 0) {
      stop();
    } else {
      throw new IllegalArgumentException(request
					 + " not supported (Filter)");
    }
  }

  /**
   * Returns true, if at the current time, the named event could
   * be generated. Assumes that supplied event names are names of
   * events that could be generated by this bean.
   *
   * @param eventName the name of the event in question
   * @return true if the named event could be generated at this point in
   * time
   */
  public boolean eventGeneratable(String eventName) {
    // can't generate the named even if we are not receiving it as an
    // input!
    if (!m_listenees.containsKey(eventName)) {
      return false;
    }
    Object source = m_listenees.get(eventName);
    if (source instanceof EventConstraints) {
      if (!((EventConstraints)source).eventGeneratable(eventName)) {
	return false;
      }
    }
    if (eventName.compareTo("instance") == 0) {
      if (!(m_Filter instanceof StreamableFilter)) {
	return false;
      }
    }
    return true;
  }
}