genericarrayeditor.java

Java 编写的多种数据挖掘算法 包括聚类、分类、预处理等

	  }
	  
	  public Dimension getPreferredSize() {

	    Font f = this.getFont();
	    FontMetrics fm = this.getFontMetrics(f);
	    return new Dimension(0, fm.getHeight());
	  }
	};
      } catch (Exception ex) {
	return null;
      }
    }
  }

  /**
   * Updates the type of object being edited, so attempts to find an
   * appropriate propertyeditor.
   *
   * @param o a value of type 'Object'
   */
  private void updateEditorType(Object o) {

    // Determine if the current object is an array
    m_ElementEditor = null; m_ListModel = null;
    removeAll();
    if ((o != null) && (o.getClass().isArray())) {
      Class elementClass = o.getClass().getComponentType();    
      PropertyEditor editor = PropertyEditorManager.findEditor(elementClass);
      Component view = null;
      ListCellRenderer lcr = new DefaultListCellRenderer();
      if (editor != null) {
	if (editor instanceof GenericObjectEditor) {
	  ((GenericObjectEditor) editor).setClassType(elementClass);
	}

        //setting the value in the editor so that
        //we don't get a NullPointerException
        //when we do getAsText() in the constructor of
        //PropertyValueSelector()
	if(Array.getLength(o) > 0) {
	  editor.setValue(Array.get(o,0));
	} else {
	  if (editor instanceof GenericObjectEditor) {
	    ((GenericObjectEditor)editor).setDefaultValue();
	  } else {   
            try {
	    editor.setValue(elementClass.newInstance());
            } catch(Exception ex) {
              m_ElementEditor=null;
              System.err.println(ex.getMessage());
              add(m_Label, BorderLayout.CENTER);
              m_Support.firePropertyChange("", null, null);
              validate();
              return;
            }
	  }
	}
        
	if (editor.isPaintable() && editor.supportsCustomEditor()) {
	  view = new PropertyPanel(editor);
	  lcr = new EditorListCellRenderer(editor.getClass(), elementClass);
	} else if (editor.getTags() != null) {
	  view = new PropertyValueSelector(editor);
	} else if (editor.getAsText() != null) {
	  view = new PropertyText(editor);
	}
      }
      if (view == null) {
	System.err.println("No property editor for class: "
			   + elementClass.getName());
      } else {
	m_ElementEditor = editor;

	// Create the ListModel and populate it
	m_ListModel = new DefaultListModel();
	m_ElementClass = elementClass;
	for (int i = 0; i < Array.getLength(o); i++) {
	  m_ListModel.addElement(Array.get(o,i));
	}
	m_ElementList.setCellRenderer(lcr);
	m_ElementList.setModel(m_ListModel);
	if (m_ListModel.getSize() > 0) {
	  m_ElementList.setSelectedIndex(0);
	} else {
	  m_DeleteBut.setEnabled(false);
	  m_EditBut.setEnabled(false);
	}
	m_UpBut.setEnabled(JListHelper.canMoveDown(m_ElementList));
	m_DownBut.setEnabled(JListHelper.canMoveDown(m_ElementList));

        //have already set the value above in the editor
	//try {
	  //if (m_ListModel.getSize() > 0) {
	  //  m_ElementEditor.setValue(m_ListModel.getElementAt(0));
	  //} else {
	  //  if (m_ElementEditor instanceof GenericObjectEditor) {
	  //    ((GenericObjectEditor)m_ElementEditor).setDefaultValue();
	  //  } else {
	  //    m_ElementEditor.setValue(m_ElementClass.newInstance());
	  //  }
	  //}
	  
	  JPanel panel = new JPanel();
	  panel.setLayout(new BorderLayout());
	  panel.add(view, BorderLayout.CENTER);
	  panel.add(m_AddBut, BorderLayout.EAST);
	  add(panel, BorderLayout.NORTH);
	  add(new JScrollPane(m_ElementList), BorderLayout.CENTER);
          JPanel panel2 = new JPanel();
          panel2.setLayout(new GridLayout(1, 4));
          panel2.add(m_DeleteBut);
          panel2.add(m_EditBut);
          panel2.add(m_UpBut);
          panel2.add(m_DownBut);
          add(panel2, BorderLayout.SOUTH);
	  m_ElementEditor
	    .addPropertyChangeListener(new PropertyChangeListener() {
	    public void propertyChange(PropertyChangeEvent e) {
	      repaint();
	    }
	  });
	//} catch (Exception ex) {
	//  System.err.println(ex.getMessage());
	//  m_ElementEditor = null;
	//}
      }
    }
    if (m_ElementEditor == null) {
      add(m_Label, BorderLayout.CENTER);
    }
    m_Support.firePropertyChange("", null, null);
    validate();
  }

  /**
   * Sets the current object array.
   *
   * @param o an object that must be an array.
   */
  public void setValue(Object o) {

    // Create a new list model, put it in the list and resize?
    updateEditorType(o);
  }

  /**
   * Gets the current object array.
   *
   * @return the current object array
   */
  public Object getValue() {

    if (m_ListModel == null) {
      return null;
    }
    // Convert the listmodel to an array of strings and return it.
    int length = m_ListModel.getSize();
    Object result = Array.newInstance(m_ElementClass, length);
    for (int i = 0; i < length; i++) {
      Array.set(result, i, m_ListModel.elementAt(i));
    }
    return result;
  }
  
  /**
   * Supposedly returns an initialization string to create a classifier
   * identical to the current one, including it's state, but this doesn't
   * appear possible given that the initialization string isn't supposed to
   * contain multiple statements.
   *
   * @return the java source code initialisation string
   */
  public String getJavaInitializationString() {

    return "null";
  }

  /**
   * Returns true to indicate that we can paint a representation of the
   * string array
   *
   * @return true
   */
  public boolean isPaintable() {
    return true;
  }

  /**
   * Paints a representation of the current classifier.
   *
   * @param gfx the graphics context to use
   * @param box the area we are allowed to paint into
   */
  public void paintValue(java.awt.Graphics gfx, java.awt.Rectangle box) {

    FontMetrics fm = gfx.getFontMetrics();
    int vpad = (box.height - fm.getAscent()) / 2;
    String rep = m_ListModel.getSize() + " " + m_ElementClass.getName();
    gfx.drawString(rep, 2, fm.getHeight() + vpad);
  }

  /**
   * Returns null as we don't support getting/setting values as text.
   *
   * @return null
   */
  public String getAsText() {
    return null;
  }

  /**
   * Returns null as we don't support getting/setting values as text. 
   *
   * @param text the text value
   * @exception IllegalArgumentException as we don't support
   * getting/setting values as text.
   */
  public void setAsText(String text) {
    throw new IllegalArgumentException(text);
  }

  /**
   * Returns null as we don't support getting values as tags.
   *
   * @return null
   */
  public String[] getTags() {
    return null;
  }

  /**
   * Returns true because we do support a custom editor.
   *
   * @return true
   */
  public boolean supportsCustomEditor() {
    return true;
  }
  
  /**
   * Returns the array editing component.
   *
   * @return a value of type 'java.awt.Component'
   */
  public java.awt.Component getCustomEditor() {
    return this;
  }

  /**
   * Adds a PropertyChangeListener who will be notified of value changes.
   *
   * @param l a value of type 'PropertyChangeListener'
   */
  public void addPropertyChangeListener(PropertyChangeListener l) {
    m_Support.addPropertyChangeListener(l);
  }

  /**
   * Removes a PropertyChangeListener.
   *
   * @param l a value of type 'PropertyChangeListener'
   */
  public void removePropertyChangeListener(PropertyChangeListener l) {
    m_Support.removePropertyChangeListener(l);
  }

  /**
   * Tests out the array editor from the command line.
   *
   * @param args ignored
   */
  public static void main(String [] args) {

    try {
      GenericObjectEditor.registerEditors();

      final GenericArrayEditor ce = new GenericArrayEditor();

      final weka.filters.Filter [] initial = new weka.filters.Filter [0];
	/*
      {
	new weka.filters.AddFilter()
	};*/
      /*
      final String [] initial = {
	"Hello",
	"There",
	"Bob"
	};*/
      PropertyDialog pd = new PropertyDialog(ce, 100, 100);
      pd.setSize(200,200);
      pd.addWindowListener(new WindowAdapter() {
	public void windowClosing(WindowEvent e) {
	  System.exit(0);
	}
      });
      ce.setValue(initial);
      //ce.validate();
    } catch (Exception ex) {
      ex.printStackTrace();
      System.err.println(ex.getMessage());
    }
  }

}