source: trunk/gli/src/org/greenstone/gatherer/gui/OpenCollectionDialog.java@ 6051

/**
 *#########################################################################
 *
 * 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.beans.*;
import java.io.File;
import java.io.IOException;
import java.text.*;
import java.util.*;
import javax.swing.*;
import javax.swing.filechooser.*;
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.util.StaticStrings;
import org.greenstone.gatherer.util.Utility;

public class OpenCollectionDialog
    extends JFileChooser {
    static final private ImageIcon LOCKED_COLLECTION_ICON = Utility.getImage("lcolicn.gif");
    static final private ImageIcon NORMAL_COLLECTION_ICON = Utility.getImage("ncolicn.gif");
    /** The name of the mouse listener that initiates editing on a double click. */
    static final private String SINGLE_CLICK_LISTENER = "SingleClickListener";

    /** Constructor */
    public OpenCollectionDialog(File file) {
    super(file);
    ///ystem.err.println("Size = " + getSize());
    // Other initialization
    setAcceptAllFileFilterUsed(false);
    setDialogTitle(Dictionary.get("OpenCollectionDialog.Title"));
    setFileFilter(new GathererFilter());
    setFileSystemView(new GathererFileSystemView());
    setFileView(new GathererFileView());
    setSize(400,300);
    // Stop the annoying renaming
    disableRename(this);
    // Description accessory
    DescriptionPreview accessory = new DescriptionPreview(this);
    setAccessory(accessory);
    // Move accessory
    JPanel accessory_pane = (JPanel) accessory.getParent();
    JPanel center_pane = (JPanel) accessory_pane.getParent();
    center_pane.add(accessory_pane, BorderLayout.SOUTH);
    }

    public void destroy() {
    }

    public String getFileName() {
    // Continually loop until the use chooses an appropriate file or cancels.
    while(true) {
        int return_val = showOpenDialog(null);
        if(return_val == JFileChooser.APPROVE_OPTION) {
        File file = getSelectedFile();
        if(file != null && file.getName().endsWith(".col")) {
            return file.getAbsolutePath();
        }
        }
        else {
        return null;
        }
    }
    }

    /** Neat method to disable file renaming in filechooser.
     * Thanks to: vladi21 from www.experts-exchange.com
     */
    static public void disableRename(Component c) {
    if (c instanceof JList){
        EventListener[] listeners=c.getListeners(MouseListener.class);
        for(int i=0; listeners != null && i < listeners.length; i++) {
        if (listeners[i].toString().indexOf(SINGLE_CLICK_LISTENER) != -1) {
            c.removeMouseListener((MouseListener)listeners[i]);
        }
        }
        return;
    }
    if (c instanceof Container) {
        Component[] children = null;
        children = ((Container)c).getComponents();
        if (children != null) {
        for(int i = 0; children != null && i < children.length; i++) {
            disableRename(children[i]);
        }
        }
    }
    }


    /* The DescriptionPreview accessory is adapted from the ImagePreview.java (an example used by FileChooserDemo2.java). */
    private class DescriptionPreview
    extends JPanel
    implements PropertyChangeListener {
    private File file = null;
    private JTextArea text;

    public DescriptionPreview(JFileChooser fc) {
        setName("Description Preview");
        setPreferredSize(new Dimension(100, 75)); // About three rows.

        text = new JTextArea();
        Dictionary.setText(text, "OpenCollectionDialog.No_Description");

        setBorder(BorderFactory.createEmptyBorder(5,0,0,0));
        setLayout(new BorderLayout());
        add(new JScrollPane(text), BorderLayout.CENTER);

        fc.addPropertyChangeListener(this);
    }

    /** Whenever a new file or folder is selected we determine what description should be displayed. */
    public void propertyChange(PropertyChangeEvent e) {
        boolean update = false;
        String prop = e.getPropertyName();
        // If the directory changed, don't show an image.
        if (JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(prop)) {
        file = null;
        update = true;
        }
        // If a file became selected, find out which one.
        else if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(prop)) {
        file = (File) e.getNewValue();
        update = true;
        }

        // Update the description accordingly.
        if (update) {
        if(file == null) {
            Dictionary.setText(text, "OpenCollectionDialog.No_Description");
        }
        else {
            // Build a wrapper around the collection configuration file.
            File config_file = new File(file.getParentFile(), Utility.CONFIG_DIR);
            if(config_file.exists()) {
            BasicCollectionConfiguration collect_cfg = new BasicCollectionConfiguration(config_file);
            text.setText(StaticStrings.SPEECH_CHARACTER + collect_cfg.getName() + StaticStrings.SPEECH_CHARACTER + StaticStrings.NEW_LINE_CHAR);
            text.setText(collect_cfg.getDescription());
            text.setCaretPosition(0);
            }
        }
        }
    }
    }

    /** ImageFilter.java is a 1.4 example used by FileChooserDemo2.java. */
    private class GathererFilter
    extends FileFilter {

    // Accept all directories and all .col files
    public boolean accept(File f) {
        return (f.isDirectory() || f.getName().toLowerCase().endsWith(".col"));
    }

    // The description of this filter
    public String getDescription() {
        return Dictionary.get("OpenCollectionDialog.Collection");
    }
    }

    private class GathererFileSystemView
    extends FileSystemView {

    private FileSystemView default_system_view = FileSystemView.getFileSystemView();

    /** Creates a new folder with a default folder name. */
    public File createNewFolder(File containingDir)
        throws IOException {
        return default_system_view.createNewFolder(containingDir);
    }

    /** Gets the list of shown (i.e. */
    public File[] getFiles(File dir, boolean useFileHiding) {
        // Retrieve the files usually returned by the platform specific file system view.
        File[] files = default_system_view.getFiles(dir, useFileHiding);
        // Determine if the current dir actually contains a valid greenstone collection. To do this we check for the presence of the file <dir>/etc/collect.cfg and a directory named import.
        File collect_cfg_file = new File(dir, Utility.CONFIG_DIR);
        File import_dir_file = new File(dir, Utility.IMPORT_DIR);
        if(collect_cfg_file.exists() && import_dir_file.exists()) {
        // Create a new dummy collection file.
        String name = dir.getName();
        File collection_file = new File(dir, name + ".col");
        // If this file doesn't already exist.
        if(!collection_file.exists()) {
            File[] temp = new File[files.length + 1];
            System.arraycopy(files, 0, temp, 0, files.length);
            temp[files.length] = collection_file;
            files = temp;
            temp = null;
        }
        collection_file = null;
        name = null;
        }
        import_dir_file = null;
        collect_cfg_file = null;
        return files;
    }
    }

    /** A FileView which returns differing icons depending on whether a lock file is present within the collection folder. */
    private class GathererFileView
    extends FileView {

    public String getDescription(File file) {
        String description = null;
        if (file.getName().endsWith(".col")) {
        if (!lockExists(file)) {
            description = Dictionary.get("OpenCollectionDialog.Normal_Collection");
        }
        else {
            description = Dictionary.get("OpenCollectionDialog.Locked_Collection");
        }
        }
        return description;
    }

    public Icon getIcon(File file) {
        Icon icon = null;
        if (file.getName().endsWith(".col")) {
        if (!lockExists(file)) {
            icon = NORMAL_COLLECTION_ICON;
        }
        else {
            icon = LOCKED_COLLECTION_ICON;
        }
        }
        return icon;
    }

    /** Determine if a lock file exists. */
    private boolean lockExists(File file) {
        File lock_file = new File(file.getParentFile(), CollectionManager.LOCK_FILE);
        return lock_file.exists();
    }
    }
}