source: gli/trunk/src/org/greenstone/gatherer/gui/DeleteCollectionPrompt.java@ 15156

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * <BR><BR>
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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.
 *########################################################################
 */
package org.greenstone.gatherer.gui;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.swing.*;
import javax.swing.event.*;
import org.greenstone.gatherer.Configuration;
import org.greenstone.gatherer.DebugStream;
import org.greenstone.gatherer.Dictionary;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.collection.BasicCollectionConfiguration;
import org.greenstone.gatherer.collection.CollectionManager;
import org.greenstone.gatherer.file.WorkspaceTree;  // !!! Don't like this here
import org.greenstone.gatherer.util.ArrayTools;
import org.greenstone.gatherer.util.StaticStrings;
import org.greenstone.gatherer.util.Utility;

/** This class provides the functionality to delete current collections from the GSDLHOME/collect/ directory. The user chooses the collection from a list, where each entry also displays details about itself, confirms the delete of a collection by checking a checkbox then presses the ok button to actually delete the collection.
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.3
 */
public class DeleteCollectionPrompt
    extends ModalDialog {
    /** The currently selected collection for deletion. */
    private BasicCollectionConfiguration collection = null;
    /** The model behind the list. */
    private DefaultListModel list_model = null;
    /** A reference to ourself so any inner-classes can dispose of us. */
    private DeleteCollectionPrompt prompt = null;
    /** The close button, which exits the prompt without deleting anything. */
    private JButton close_button = null;
    /** The ok button which causes the selected collection to be deleted. */
    private JButton ok_button = null;
    /** The confirmation check box. */
    private JCheckBox confirmation = null;
    /** The label above details. */
    private JLabel details_label = null;
    /** The label above the list. */
    private JLabel list_label = null;
    /** The list of available collections. */
    private JList list = null;
    /** The text area used to display details about the collection selected. */
    private JTextArea details = null;
    /** A string array used to pass arguments to the phrase retrieval method. */
    private String args[] = null;

    private boolean current_coll_deleted = false;
    /** The size of the delete prompt screen. */
    public static final Dimension SIZE = new Dimension(500, 500);

    /** Constructor.
     */
    public DeleteCollectionPrompt() {
    super(Gatherer.g_man);
    close_button = new GLIButton(Dictionary.get("General.Close"), Dictionary.get("General.Close_Tooltip"));
    
    confirmation = new JCheckBox(Dictionary.get("DeleteCollectionPrompt.Confirm_Delete"));
    details = new JTextArea(Dictionary.get("DeleteCollectionPrompt.No_Collection"));
    details.setEditable(false);
    details_label = new JLabel(Dictionary.get("DeleteCollectionPrompt.Collection_Details"));

    list = new JList();
    list_label = new JLabel(Dictionary.get("DeleteCollectionPrompt.Collection_List"));
    
    list_model = new DefaultListModel();
    ok_button = new GLIButton(Dictionary.get("DeleteCollectionPrompt.Delete"), Dictionary.get("DeleteCollectionPrompt.Delete_Tooltip"));
    
    prompt = this;
    setModal(true);
    setSize(SIZE);
    setTitle(Dictionary.get("DeleteCollectionPrompt.Title"));
    
    setJMenuBar(new SimpleMenuBar("deletingcollections")); 
    close_button.addActionListener(new CloseButtonListener());
    confirmation.addActionListener(new ConfirmationCheckBoxListener());
    confirmation.setEnabled(false);
    confirmation.setSelected(false);
    list.addListSelectionListener(new CollectionListListener());
    list.clearSelection();
    list.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    list.setModel(list_model);
    ok_button.addActionListener(new OKButtonListener());
    ok_button.setEnabled(false);
    scanForCollections();
    }

    /** Destructor. */
    public void destroy() {
    list_model.clear();
    list_model = null;
    close_button = null;
    confirmation = null;
    details = null;
    details_label = null;
    list = null;
    ok_button = null;
    prompt = null;
    }

    /** This method causes the modal prompt to be displayed. 
     * returns true if it has deleted the collection that is currently open */
    public boolean display() {
    // Central pane
    JPanel list_pane = new JPanel(new BorderLayout());
    list_pane.add(list_label, BorderLayout.NORTH);
    list_pane.add(new JScrollPane(list), BorderLayout.CENTER);
    list_pane.setBorder(BorderFactory.createEmptyBorder(0, 0, 5, 0));

    JPanel details_pane = new JPanel(new BorderLayout());
    details_pane.add(details_label, BorderLayout.NORTH);
    details_pane.add(new JScrollPane(details), BorderLayout.CENTER);
    details_pane.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

    JPanel central_pane = new JPanel(new GridLayout(2, 1));
    central_pane.add(list_pane);
    central_pane.add(details_pane);
    central_pane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));

    // Lower pane
    JPanel confirmation_pane = new JPanel(new BorderLayout());
    confirmation_pane.add(confirmation, BorderLayout.CENTER);
    confirmation_pane.setBorder(BorderFactory.createEmptyBorder(0,0,5,0));

    JPanel button_pane = new JPanel(new GridLayout(1, 2));
    button_pane.add(ok_button);
    button_pane.add(close_button);
    button_pane.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));

    JPanel lower_pane = new JPanel(new BorderLayout());
    lower_pane.add(confirmation_pane, BorderLayout.NORTH);
    lower_pane.add(button_pane, BorderLayout.SOUTH);
    lower_pane.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

    // Final.
    JPanel content_pane = (JPanel)this.getContentPane();
    content_pane.setLayout(new BorderLayout());
    content_pane.add(central_pane, BorderLayout.CENTER);
    content_pane.add(lower_pane, BorderLayout.SOUTH);

    // Center and display.
    Dimension screen_size = Configuration.screen_size;
    this.setLocation((screen_size.width - SIZE.width) / 2, (screen_size.height - SIZE.height) / 2);
    this.setVisible(true); // blocks until the dialog is killed
    return current_coll_deleted;
    }


    /** Shows a delete complete prompt. 
     * @param success A <strong>boolean</strong> indicating if the collection was successfully deleted.
     * @see org.greenstone.gatherer.collection.Collection
     */
    public void resultPrompt(boolean success) {
    args = new String[1];
    args[0] = collection.getName();
    if (success) {
        JOptionPane.showMessageDialog(prompt,Dictionary.get("DeleteCollectionPrompt.Successful_Delete", args),Dictionary.get("DeleteCollectionPrompt.Successful_Title"),JOptionPane.INFORMATION_MESSAGE);
    }
    else {
        JOptionPane.showMessageDialog(prompt,Dictionary.get("DeleteCollectionPrompt.Failed_Delete", args),Dictionary.get("DeleteCollectionPrompt.Failed_Title"),JOptionPane.WARNING_MESSAGE);
    }
    }

    /** Method to scan the collect directory retrieving and reloading each collection it finds, while building the list of known collections.
     * @see org.greenstone.gatherer.Configuration
     * @see org.greenstone.gatherer.Gatherer
     * @see org.greenstone.gatherer.util.ArrayTools
     * @see org.greenstone.gatherer.util.Utility
     */
    private void scanForCollections() {
    // Start at the collect dir.
    File collect_directory = new File(Gatherer.getCollectDirectoryPath());
    if (collect_directory.exists()) {
        // Now for each child directory see if it contains a .col file and
        // if so try to load it..
        File collections[] = collect_directory.listFiles();
        String file_name = (Gatherer.GS3)? Utility.CONFIG_GS3_FILE : Utility.CONFIG_FILE;
        ArrayTools.sort(collections);
        for(int i = 0; collections != null && i < collections.length; i++) {
        if(collections[i].isDirectory() && !collections[i].getName().equals(StaticStrings.MODEL_COLLECTION_NAME)) {
            File config_file = new File(collections[i], file_name);
            if (config_file.exists()) {
            BasicCollectionConfiguration config = new BasicCollectionConfiguration(config_file);
            list_model.addElement(config);
            config = null;
            }
        }
        }
    }
    // Otherwise the collect directory doesn't actually exist, so there ain't much we can do.
    }

    /** A button listener implementation, which listens for actions on the close button and disposes of the dialog when detected. */
    private class CloseButtonListener 
    implements ActionListener {
    /** Any implementation of ActionListener must include this method so we can be informed when the button is actioned.
     * @param event An <strong>ActionEvent</strong> containing all the relevant information garnered from the event itself.
     */
    public void actionPerformed(ActionEvent event) {
        // Done
        prompt.dispose();
    }
    }

    /** This private class listens for selection events in from the list and then displays the appropriate details for that collection.
     */
    private class CollectionListListener 
    implements ListSelectionListener {
    /** Any implementation of ListSelectionListener must include this method so we can be informed when the list selection changes.
     * @param  event a <strong>ListSelectionEvent</strong> containing all the relevant information garnered from the event itself
     */
    public void valueChanged(ListSelectionEvent event) {
        ok_button.setEnabled(false);
        confirmation.setSelected(false);
        if(!list.isSelectionEmpty()) {
        collection = (BasicCollectionConfiguration) list.getSelectedValue();

        String currentColName = (Gatherer.c_man.getCollection() == null) ? "" : Gatherer.c_man.getCollection().getName();
        if(!collection.getShortName().equals(currentColName)) { 
            // the selected collection can only be deleted if it is NOT the collection that is currently open
            confirmation.setEnabled(true);
            confirmation.setToolTipText(null); // no tooltip
            ok_button.setToolTipText(null);

            args = new String[3];
            args[0] = collection.getCreator();
            args[1] = collection.getMaintainer();
            args[2] = collection.getDescription();
            details.setText(Dictionary.get("DeleteCollectionPrompt.Details", args));
            details.setCaretPosition(0);
        } else { // trying to delete the collection that is open at present
            // add a tooltip saying to the confirmation checkbox saying that the current collection can't be deleted 
            String tooltip = Dictionary.get("DeleteCollectionPrompt.Cannot_Delete_Open_Collection_Tooltip", 
                            collection.getName());
            confirmation.setToolTipText(tooltip);
            ok_button.setToolTipText(tooltip);
            // delete/ok button and confirmation checkbox should be disabled
            ok_button.setEnabled(false);
            confirmation.setEnabled(false);
            confirmation.setSelected(false);
        }
        }
        else {
        confirmation.setEnabled(false);
        details.setText(Dictionary.get("DeleteCollectionPrompt.No_Collection"));
        }
    }
    }

    /** A check box listener so we can tell if the user has confirmed the deletion */
    private class ConfirmationCheckBoxListener
    implements ActionListener {
    /** Any implementation of ActionListener must include this method so we can be informed when the button is actioned.
     * @param event An <strong>ActionEvent</strong> containing all the relevant information garnered from the event itself.
     */
    public void actionPerformed(ActionEvent event) {
        // OK button is only enabled if the confirmation check box is ticked
        ok_button.setEnabled(confirmation.isSelected());
    }
    }

    /** The OK button listener implementation. */
    private class OKButtonListener 
    implements ActionListener {
    /** Any implementation of ActionListener must include this method so we can be informed when the button is actioned.
     * @param event An <strong>ActionEvent</strong> containing all the relevant information garnered from the event itself.
     * @see org.greenstone.gatherer.Configuration
     * @see org.greenstone.gatherer.Gatherer
     * @see org.greenstone.gatherer.util.Utility
     */
    public void actionPerformed(ActionEvent event)
    {
        // Delete the selected collection.
        if (Gatherer.c_man.deleteCollection(collection.getShortName())) {
        // Refresh the collections shown in the workspace tree
        Gatherer.g_man.refreshWorkspaceTree(WorkspaceTree.LIBRARY_CONTENTS_CHANGED);

        if (collection.getShortName().equals(CollectionManager.getLoadedCollectionName())) {
            current_coll_deleted = true;
        }
        list_model.removeElement(collection);

        resultPrompt(true);
        details.setText(Dictionary.get("DeleteCollectionPrompt.No_Collection"));
        confirmation.setEnabled(false);
        confirmation.setSelected(false);
        ok_button.setEnabled(false);
        collection = null;
        }
        else {
        resultPrompt(false);
        }
    }
    }
}