source: trunk/gli/src/org/greenstone/gatherer/file/FileManager.java@ 8576

/**
 *#########################################################################
 *
 * 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.file;

import java.io.File;
import javax.swing.*;
import org.greenstone.gatherer.Dictionary;
import org.greenstone.gatherer.Gatherer;
import org.greenstone.gatherer.gui.LongProgressBar;
import org.greenstone.gatherer.gui.NewFolderPrompt;
import org.greenstone.gatherer.gui.tree.DragTree;
import org.greenstone.gatherer.util.DragComponent;
import org.greenstone.gatherer.util.Utility;

/** Manages the moving of files within a separate thread.
 * @author John Thompson, Greenstone Digital Library, University of Waikato
 * @version 2.3
 */
public class FileManager {

    static public int countFolderDepth(File file) {
    int count = 0;
    while(file != null) {
        count++;
        file = file.getParentFile();
    }
    return count;
    }

    /** Not only the queue of files to be moved, but also the object that moves them. */
    private FileQueue queue = null;
    /** Constructor.
     * @see org.greenstone.gatherer.file.FileQueue
     */
    public FileManager() {
    queue = new FileQueue(false);
    queue.start();
    }

    /** Given the arguments, determine what action should be carried out by the file queue, and add all of the necessary file jobs. */
    public void action(DragComponent source, FileNode[] source_nodes, DragComponent target, FileNode target_node) {
    byte type = 0;
    // If source and target are the same we are moving
    if(source == target) {
        type = FileJob.MOVE;
    }
    // If source and target are different
    else {
        // If target is the RecycleBin, we're deleting
        if (target instanceof RecycleBin) {
        // The workspace tree is read only.
        // ... except for files from the "Downloaded Files" folder
        boolean from_downloaded_files_folder = false;
        if (source_nodes != null) {
            for (int i = 0; i < source_nodes.length; i++) {
            if (source_nodes[i].getFile() != null) {
                if (source_nodes[i].getFile().getAbsolutePath().startsWith(Utility.getCacheDir().getAbsolutePath())) {
                from_downloaded_files_folder = true;
                }
            }
            }
        }

        // Can only delete from the "Downloaded Files" folder if a collection is open
        if (from_downloaded_files_folder && Gatherer.c_man.ready() == false) {
            return;
        }

        if (source.toString().equals("Workspace") && !from_downloaded_files_folder) {
            JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.Read_Only"), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
            return;
        }
        // Normal delete. Go ahead.
        else {
            type = FileJob.DELETE;
        }
        }
        // Otherwise we are copying
        else {
        type = FileJob.COPY;
        }
    }
    Task task = new Task(System.currentTimeMillis(), source, source_nodes, target, target_node, type);
    task.start();
    }

    /** Retrieves the file queue object. */
    public FileQueue getQueue() {
    return queue;
    }

    public void newFolder(DragTree tree, FileNode parent_node) {
    // Ask the user for the directories name.
    NewFolderPrompt new_folder_prompt = new NewFolderPrompt(parent_node);
    String name = new_folder_prompt.display();
    new_folder_prompt.dispose();
    new_folder_prompt = null;
    // And if the name is non-null...
    if(name != null) {
        FileSystemModel model = (FileSystemModel) tree.getModel();
        File folder_file = new File(parent_node.getFile(), name);
        //... check if it already exists.
        if(folder_file.exists()) {
        JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.Folder_Already_Exists", name), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
        }
        // Otherwise create it.
        else {
        folder_file.mkdirs();

        // Update the parent node to show the new folder
        parent_node.unmap();
        parent_node.map();

        // Refresh workspace tree (collection tree is done automatically)
        Gatherer.g_man.refreshWorkspaceTree(DragTree.COLLECTION_CONTENTS_CHANGED);
        }
        folder_file = null;
        model = null;
    }
    name = null;
    }

    private class Task
    extends Thread {
    private byte type;
    private DragComponent source;
    private DragComponent target;
    private FileNode target_node;
    private FileNode[] source_nodes;
    private long id;

    public Task(long id, DragComponent source, FileNode[] source_nodes, DragComponent target, FileNode target_node, byte type) {
        this.id = id;
        this.source = source;
        this.source_nodes = source_nodes;
        this.target = target;
        this.target_node = target_node;
        this.type = type;
    }

    public void run()
    {
        // Check there is something to do
        if (source_nodes == null) {
        return;
        }

        // Reset the progress bar and set it to indeterminate while calculating its size
        LongProgressBar progress_bar = queue.getProgressBar();
        progress_bar.reset();
        progress_bar.setIndeterminate(true);

        // Calculate the progress bar size
        boolean cancelled = queue.calculateSize(source_nodes);
        if (!cancelled) {
        // Queue the job(s) (this may fail if we are asked to delete a read only file)
        for (int i = 0; i < source_nodes.length; i++) {
            queue.addJob(id, source, source_nodes[i], target, target_node, type, true, true, true);
        }
        }

        progress_bar.setIndeterminate(false);
        progress_bar.clear();
    }
    }
}