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This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2004 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.java.j2seproject.ui.customizer;

import java.awt.Component;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListSelectionModel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import org.netbeans.modules.java.j2seproject.J2SEProjectUtil;
import org.openide.awt.Mnemonics;

import org.openide.awt.MouseUtils;
import org.openide.cookies.SourceCookie;
import org.openide.filesystems.FileObject;
import org.openide.loaders.DataObject;
import org.openide.loaders.DataObjectNotFoundException;
import org.openide.nodes.AbstractNode;
import org.openide.nodes.Children;
import org.openide.nodes.Node;
import org.openide.src.ClassElement;
import org.openide.src.SourceElement;
import org.openide.util.NbBundle;
import org.openide.util.RequestProcessor;



/** Browses and allows to choose a project's main class.
 *
 * @author  Jiri Rechtacek
 */
public class MainClassChooser extends JPanel {

    private ChangeListener changeListener;
    private String dialogSubtitle = null;
    private List/**/ possibleMainClasses;
            
    /** Creates new form MainClassChooser */
    public MainClassChooser (FileObject sourcesRoot) {
        this (sourcesRoot, null);
    }

    public MainClassChooser (FileObject sourcesRoot, String subtitle) {
        dialogSubtitle = subtitle;
        initComponents();
        initClassesView (sourcesRoot);
    }
    
    private void initClassesView (final FileObject sourcesRoot) {
        possibleMainClasses = null;
        jMainClassList.setSelectionMode (ListSelectionModel.SINGLE_SELECTION);
        jMainClassList.setListData (getWarmupList ());
        RequestProcessor.getDefault ().post (new Runnable () {
            public void run () {
                possibleMainClasses = J2SEProjectUtil.getMainClasses (sourcesRoot);
                if (possibleMainClasses.isEmpty ()) {
                    jMainClassList.setListData (new String[] { NbBundle.getMessage (MainClassChooser.class, "LBL_ChooseMainClass_NO_CLASSES_NODE") } ); // NOI18N
                } else {
                    Object[] arr = possibleMainClasses.toArray ();
                    // #46861, sort name of classes
                    Arrays.sort (arr);
                    jMainClassList.setListData (arr);
                    jMainClassList.setSelectedIndex (0);
                }
            }
        });
        jMainClassList.addListSelectionListener (new ListSelectionListener () {
            public void valueChanged (ListSelectionEvent evt) {
                if (changeListener != null) {
                    changeListener.stateChanged (new ChangeEvent (evt));
                }
            }
        });
        // support for double click to finish dialog with selected class
        jMainClassList.addMouseListener (new MouseListener () {
            public void mouseClicked (MouseEvent e) {
                if (MouseUtils.isDoubleClick (e)) {
                    if (getSelectedMainClass () != null) {
                        if (changeListener != null) {
                            changeListener.stateChanged (new ChangeEvent (e));
                        }
                    }
                }
            }
            public void mousePressed (MouseEvent e) {}
            public void mouseReleased (MouseEvent e) {}
            public void mouseEntered (MouseEvent e) {}
            public void mouseExited (MouseEvent e) {}
        });
        if (dialogSubtitle != null) {
            Mnemonics.setLocalizedText (jLabel1, dialogSubtitle);
        }
    }
    
    private Object[] getWarmupList () {
        return new Object[] {NbBundle.getMessage (MainClassChooser.class, "LBL_ChooseMainClass_WARMUP_MESSAGE")}; // NOI18N
    }
    
    private boolean isValidMainClassName (Object value) {
        return (possibleMainClasses != null) && (possibleMainClasses.contains (value));
    }


    /** Returns the selected main class.
     *
     * @return name of class or null if no class with the main method is selected
     */    
    public String getSelectedMainClass () {
        if (isValidMainClassName (jMainClassList.getSelectedValue ())) {
            return (String)jMainClassList.getSelectedValue ();
        } else {
            return null;
        }
    }
    
    public void addChangeListener (ChangeListener l) {
        changeListener = l;
    }
    
    public void removeChangeListener (ChangeListener l) {
        changeListener = null;
    }
    
    // Used only from unit tests to suppress check of main method. If value
    // is different from null it will be returned instead.
    public static Boolean unitTestingSupport_hasMainMethodResult = null;
    
    /** Checks if given file object contains the main method.
     *
     * @param classFO file object represents java 
     * @return false if parameter is null or doesn't contain SourceCookie
     * or SourceCookie doesn't contain the main method
     */    
    public static boolean hasMainMethod (FileObject classFO) {
        return J2SEProjectUtil.hasMainMethod (classFO);
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {//GEN-BEGIN:initComponents
        java.awt.GridBagConstraints gridBagConstraints;

        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jMainClassList = new javax.swing.JList();

        setLayout(new java.awt.GridBagLayout());

        setPreferredSize(new java.awt.Dimension(380, 300));
        getAccessibleContext().setAccessibleDescription(java.util.ResourceBundle.getBundle("org/netbeans/modules/java/j2seproject/ui/customizer/Bundle").getString("AD_MainClassChooser"));
        jLabel1.setLabelFor(jMainClassList);
        org.openide.awt.Mnemonics.setLocalizedText(jLabel1, java.util.ResourceBundle.getBundle("org/netbeans/modules/java/j2seproject/ui/customizer/Bundle").getString("CTL_AvaialableMainClasses"));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        gridBagConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER;
        gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.insets = new java.awt.Insets(12, 12, 2, 12);
        add(jLabel1, gridBagConstraints);

        jScrollPane1.setMinimumSize(new java.awt.Dimension(100, 200));
        jScrollPane1.setViewportView(jMainClassList);
        jMainClassList.getAccessibleContext().setAccessibleDescription(java.util.ResourceBundle.getBundle("org/netbeans/modules/java/j2seproject/ui/customizer/Bundle").getString("AD_jMainClassList"));

        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        gridBagConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER;
        gridBagConstraints.gridheight = java.awt.GridBagConstraints.REMAINDER;
        gridBagConstraints.fill = java.awt.GridBagConstraints.BOTH;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.NORTHWEST;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.weighty = 1.0;
        gridBagConstraints.insets = new java.awt.Insets(0, 12, 0, 12);
        add(jScrollPane1, gridBagConstraints);

    }//GEN-END:initComponents


    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel jLabel1;
    private javax.swing.JList jMainClassList;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration//GEN-END:variables

    // Maybe useless renderer (fit if wanted to reneder Icons) // XXX
//    private static final class MainClassRenderer extends DefaultListCellRenderer {
//        public Component getListCellRendererComponent (JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
//            String displayName;
//            if (value instanceof String) {
//                displayName = (String) value;
//            } if (value instanceof FileObject) {
//                displayName = ((FileObject)value).getName ();
//            } else {
//                displayName = value.toString ();
//            }
//            return super.getListCellRendererComponent (list, displayName, index, isSelected, cellHasFocus);
//        }
//    }
//
}
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