content: /*
   *    This program is free software; you can redistribute it and/or modify
   *    it under the terms of the GNU General Public License as published by
   *    the Free Software Foundation; either version 2 of the License, or
   *    (at your option) any later version.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU General Public License for more details.
   *
   *    You should have received a copy of the GNU General Public License
   *    along with this program; if not, write to the Free Software
   *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *    PropertySelectorDialog.java
   *    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
   *
   */
  
  package weka.gui;
  
  import weka.experiment.PropertyNode;
  
  import java.awt.BorderLayout;
  import java.awt.Container;
  import java.awt.Frame;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.beans.BeanInfo;
  import java.beans.IntrospectionException;
  import java.beans.Introspector;
  import java.beans.PropertyDescriptor;
  import java.beans.PropertyEditor;
  import java.beans.PropertyEditorManager;
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  
  import javax.swing.Box;
  import javax.swing.BoxLayout;
  import javax.swing.JButton;
  import javax.swing.JDialog;
  import javax.swing.JScrollPane;
  import javax.swing.JTree;
  import javax.swing.tree.DefaultMutableTreeNode;
  import javax.swing.tree.TreePath;
  import javax.swing.tree.TreeSelectionModel;
  
  /** 
   * Allows the user to select any (supported) property of an object, including
   * properties that any of it's property values may have.
   *
   * @author Len Trigg (trigg@cs.waikato.ac.nz)
   * @version $Revision: 1.9 $
   */
  public class PropertySelectorDialog
    extends JDialog {
  
    /** for serialization */
    private static final long serialVersionUID = -3155058124137930518L;
    
    /** Click to choose the currently selected property */
    protected JButton m_SelectBut = new JButton("Select");
  
    /** Click to cancel the property selection */
    protected JButton m_CancelBut = new JButton("Cancel");
  
    /** The root of the property tree */
    protected DefaultMutableTreeNode m_Root;
  
    /** The object at the root of the tree */
    protected Object m_RootObject;
  
    /** Whether the selection was made or cancelled */
    protected int m_Result;
  
    /** Stores the path to the selected property */
    protected Object [] m_ResultPath;
  
    /** The component displaying the property tree */
    protected JTree m_Tree;
  
    /** Signifies an OK property selection */
    public static final int APPROVE_OPTION = 0;
  
    /** Signifies a cancelled property selection */
    public static final int CANCEL_OPTION = 1;
    
    /**
     * Create the property selection dialog.
     *
     * @param parentFrame the parent frame of the dialog
     * @param rootObject the object containing properties to select from
     */
    public PropertySelectorDialog(Frame parentFrame, Object rootObject) {
      
      super(parentFrame, "Select a property", true);
      m_CancelBut.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
  	m_Result = CANCEL_OPTION;
  	setVisible(false);
        }
      });
      m_SelectBut.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
  	// value = path from root to selected;
  	TreePath tPath = m_Tree.getSelectionPath();
  	if (tPath == null) {
  	  m_Result = CANCEL_OPTION;
  	} else {
  	  m_ResultPath = tPath.getPath();
  	  if ((m_ResultPath == null) || (m_ResultPath.length < 2)) {
  	    m_Result = CANCEL_OPTION;
  	  } else {
  	    m_Result = APPROVE_OPTION;
  	  }
  	} 
  	setVisible(false);
        }
      });
      m_RootObject = rootObject;
      m_Root = new DefaultMutableTreeNode(
  	     new PropertyNode(m_RootObject));
      createNodes(m_Root);
      
      Container c = getContentPane();
      c.setLayout(new BorderLayout());
      //    setBorder(BorderFactory.createTitledBorder("Select a property"));
      Box b1 = new Box(BoxLayout.X_AXIS);
      b1.add(m_SelectBut);
      b1.add(Box.createHorizontalStrut(10));
      b1.add(m_CancelBut);
      c.add(b1, BorderLayout.SOUTH);
      m_Tree = new JTree(m_Root);
      m_Tree.getSelectionModel()
        .setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
      c.add(new JScrollPane(m_Tree), BorderLayout.CENTER);
      pack();
    }
  
    /**
     * Pops up the modal dialog and waits for cancel or a selection.
     *
     * @return either APPROVE_OPTION, or CANCEL_OPTION
     */
    public int showDialog() {
  
      m_Result = CANCEL_OPTION;
      setVisible(true);
      return m_Result;
    }
  
    /**
     * Gets the path of property nodes to the selected property.
     *
     * @return an array of PropertyNodes
     */
    public PropertyNode [] getPath() {
  
      PropertyNode [] result = new PropertyNode [m_ResultPath.length - 1];
      for (int i = 0; i < result.length; i++) {
        result[i] = (PropertyNode) ((DefaultMutableTreeNode) m_ResultPath[i + 1])
  	.getUserObject();
      }
      return result;
    }
  
    /**
     * Creates the property tree below the current node.
     *
     * @param localNode a value of type 'DefaultMutableTreeNode'
     */
    protected void createNodes(DefaultMutableTreeNode localNode) {
  
      PropertyNode pNode = (PropertyNode)localNode.getUserObject();
      Object localObject = pNode.value;
      // Find all the properties of the object in the root node
      PropertyDescriptor localProperties[];
      try {
        BeanInfo bi = Introspector.getBeanInfo(localObject.getClass());
        localProperties = bi.getPropertyDescriptors();
      } catch (IntrospectionException ex) {
        System.err.println("PropertySelectorDialog: Couldn't introspect");
        return;
      }
  
      // Put their values into child nodes.
      for (int i = 0; i < localProperties.length; i++) {
        // Don't display hidden or expert properties.
        if (localProperties[i].isHidden() || localProperties[i].isExpert()) {
  	continue;
        }
        String name = localProperties[i].getDisplayName();
        Class type = localProperties[i].getPropertyType();
        Method getter = localProperties[i].getReadMethod();
        Method setter = localProperties[i].getWriteMethod();
        Object value = null;
        // Only display read/write properties.
        if (getter == null || setter == null) {
  	continue;
        }
        try {
  	Object args[] = { };
  	value = getter.invoke(localObject, args);
  	PropertyEditor editor = null;
  	Class pec = localProperties[i].getPropertyEditorClass();
  	if (pec != null) {
  	  try {
  	    editor = (PropertyEditor)pec.newInstance();
  	  } catch (Exception ex) {
  	  }
  	}
  	if (editor == null) {
  	  editor = PropertyEditorManager.findEditor(type);
  	}
  	if ((editor == null) || (value == null)) {
  	  continue;
  	}
        } catch (InvocationTargetException ex) {
  	System.err.println("Skipping property " + name
  			   + " ; exception on target: "
  			   + ex.getTargetException());
  	ex.getTargetException().printStackTrace();
  	continue;
        } catch (Exception ex) {
  	System.err.println("Skipping property " + name
  			   + " ; exception: " + ex);
  	ex.printStackTrace();
  	continue;
        }
        // Make a child node
        DefaultMutableTreeNode child = new DefaultMutableTreeNode(
  				     new PropertyNode(value,
  						      localProperties[i],
  						      localObject.getClass()));
        localNode.add(child);
        createNodes(child);
      }
    }
  
    
    /**
     * Tests out the property selector from the command line.
     *
     * @param args ignored
     */
    public static void main(String [] args) {
  
      try {
        GenericObjectEditor.registerEditors();
  
        Object rp
  	= new weka.experiment.AveragingResultProducer();
        final PropertySelectorDialog jd = new PropertySelectorDialog(null, rp);
        int result = jd.showDialog();
        if (result == PropertySelectorDialog.APPROVE_OPTION) {
  	System.err.println("Property Selected");
  	PropertyNode [] path = jd.getPath();
  	for (int i = 0; i < path.length; i++) {
  	  PropertyNode pn = path[i];
  	  System.err.println("" + (i + 1) + "  " + pn.toString()
  			     + " " + pn.value.toString());
  	}
        } else {
  	System.err.println("Cancelled");
        }
        System.exit(0);
      } catch (Exception ex) {
        ex.printStackTrace();
        System.err.println(ex.getMessage());
      }
    }
  }
  