adddellist.java

一个完整的XACML工程,学习XACML技术的好例子!

/*
* Copyright (c) 2006, University of Kent
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* 5. This license is governed, except to the extent that local laws
* necessarily apply, by the laws of England and Wales.
*/

/*
 * AddDelList.java - 10/11/05
 */
package issrg.utils.xml;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;


/**
 * This class is an abstract class and is a general purpose list editing component. 
 * Implements methods from ActionListener, ListSelectionListener and MouseListener.
 * <p>
 * This class extends a JPanel, and places a JListBox and three 
 * <code>JButton</code>s for adding/deleting/modifying entries in the listBox.
 * <p>
 * It is designed as an abstract class so that each class that uses it will, 
 * specify its own needs for adding/deleting/modifying.
 * <p>
 * This Class is one of the Basic Building blocks of the Policy Editor, as many 
 * classes implement it in some way or another.
 *
 * @author Christian Azzopardi
 */
public abstract class AddDelList extends JPanel implements ActionListener, ListSelectionListener, MouseListener
{   
    /**
     * The Add Button Variable 
     */
    public JButton addButton;
    
    /**
     * The Delete Button Variable 
     */    
    public JButton deleteButton;
    
    /**
     * The Replace Button Variable 
     */    
    public JButton replaceButton;
    
    /**
     * The List Box Variable 
     */    
    public JList listBox;
    
    /**
     * Scroll Pane Variable, to enable list scrolling 
     */    
    public JScrollPane scrollList;
    
    /**
     * Panels needed in order to construct the final output of the AddDelList. 
     * They are mainly used is the getContentPanel() method.
     */
    public JPanel viewDisplay, addDisplay, deleteDisplay, replaceDisplay, listBoxDisplay;
    
    /**
     * A pop-up Menu, that appears on right clicking in the ListBox.
     */    
    public JPopupMenu popupMenu;
    
    /**
     * List of Items that appear in the popupMenu. So far it only contains 
     * a link for Clearing the current List Selection. 
     * <p>
     * This was implemented, as to clear Selection from a list may be hard 
     * or impossible, when the rows in the list are full (Even when the
     * scroll bar can be used).
     */    
    public JMenuItem items[];
    
    /**
     * Declaration that the size of the popup menu used is going to be of 1 item.
     */    
    protected static int sizeOfPopupMenu = 1;
    
    /**
     * Constraints for the GridBagLayout. This will enable better presentation
     * constraints.
     */ 
    public GridBagConstraints constraints;
    
    /**
     * The Data Elements Contained in the listBox, initialised to zero, so as 
     * not to have available selections in the listbox, when the list is empty.
     */    
    protected String[] listData = new String[0];
    
    /**
     * Sets the Layout for this GUI Component, and adds the contents created
     * in the getContentPanel() method. The Contents are added with a
     * BorderLayout.CENTER constraint so as to grow/shrink accordingly.
     */
    public AddDelList()
    {  
        this.setLayout(new BorderLayout());
        this.add(getContentPanel(), BorderLayout.CENTER);
    }
    
    /**
     * A JPanel containing the basic panel. This creates the GUI of 
     * the AddDelList, and returns it.
     *
     * @return     The basic panel containing one list and 3 Buttons.
     *             The Buttons are themselves placed in panels. 
     */
    public JPanel getContentPanel()
    {
        viewDisplay = new JPanel();
        addDisplay = new JPanel();
        deleteDisplay = new JPanel();
        replaceDisplay = new JPanel();
        listBoxDisplay = new JPanel();
        viewDisplay.setLayout(new GridBagLayout());
        addDisplay.setLayout(new BorderLayout());
        deleteDisplay.setLayout(new BorderLayout());
        replaceDisplay.setLayout(new BorderLayout());
        listBoxDisplay.setLayout(new BorderLayout());
        constraints = new GridBagConstraints();
        
        addButton = new JButton("+");
        deleteButton = new JButton ("-");
        replaceButton = new JButton ("replace");
        listBox = new JList();
        addButton.addActionListener(this);
        deleteButton.addActionListener(this);
        replaceButton.addActionListener(this);
        deleteButton.setEnabled(false);
        replaceButton.setEnabled(false);
        
        items = new JMenuItem[1];
        items[0] = new JMenuItem("Clear");
        items[0].addActionListener(this);
        items[0].setActionCommand("clear_selection");
        popupMenu = new JPopupMenu();
        for (int i = 0; i < items.length; i++)
        {
            popupMenu.add(items[i]);
        }
        
        scrollList = new JScrollPane(listBox);
        listBox.addListSelectionListener(this);   
        listBox.setVisibleRowCount(5);
        listBox.setFixedCellWidth(100);
        listBox.setFixedCellHeight(18);
        listBox.addMouseListener(this);
        listBox.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        //listBox.setPreferredSize(new Dimension(20,20));
        Font displayFont = new Font("Arial", Font.BOLD, 12);
        listBox.setFont(displayFont);
        listBoxDisplay.add(scrollList, BorderLayout.CENTER);
        
        addComponent(listBoxDisplay, viewDisplay, 0, 0, 3, 1, GridBagConstraints.CENTER, 0.2, 0.9, GridBagConstraints.BOTH);
                
        addDisplay.add(addButton, BorderLayout.CENTER);
        deleteDisplay.add(deleteButton, BorderLayout.CENTER);
        replaceDisplay.add(replaceButton, BorderLayout.CENTER);
        
        addComponent(addDisplay, viewDisplay, 1, 0, 1, 1, GridBagConstraints.CENTER, 0.33, 0, GridBagConstraints.HORIZONTAL);
        addComponent(replaceDisplay, viewDisplay, 1, 1, 1, 1, GridBagConstraints.CENTER, 0.33, 0, GridBagConstraints.HORIZONTAL);
        addComponent(deleteDisplay, viewDisplay, 1, 2, 1, 1, GridBagConstraints.CENTER, 0.33, 0, GridBagConstraints.HORIZONTAL);
        
        return viewDisplay;
    }

    /**
     * When a list selection occurs this method is executed, and updates the 
     * functionality of the buttons in order to specify what the user can /
     * can not press.
     *
     * @param e  the ListSelectionEvent
     */
    public void valueChanged(ListSelectionEvent e)
    {      
       if(getSelectedIndex()<0) // nothing selected - disable the buttons
       {
           deleteButton.setEnabled(false);
           replaceButton.setEnabled(false);
       }
       else // something is selected - enable buttons
       {
           deleteButton.setEnabled(true);
       }
       
       itemSelected();
    }
    
    /**
     *  An abstract method that is called when an item is 
     *  Selected from a list.
     */
    public abstract void itemSelected();
    
    /**
     *  An abstract method that is called when an item is 
     *  to be added to a list.
     */
    public abstract void addItem();
    
    /**
     *  An abstract method that is called when an item is 
     *  to be replaced from a list.
     */
    public abstract void replaceItem();
    
    /**
     *  An abstract method that is called when an item is 
     *  to be removed from a list.
     */