source: main/trunk/gli/src/org/greenstone/gatherer/file/FileManager.java@ 34288

/**
 *#########################################################################
 *
 * 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, NZDL Project, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 2005 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.collection.CollectionManager;
import org.greenstone.gatherer.collection.CollectionTree;
import org.greenstone.gatherer.collection.CollectionTreeNode;
import org.greenstone.gatherer.gui.ExplodeMetadataDatabasePrompt;
import org.greenstone.gatherer.gui.ReplaceSrcDocWithHtmlPrompt; 
import org.greenstone.gatherer.gui.GProgressBar;
import org.greenstone.gatherer.gui.NewFolderOrFilePrompt;
import org.greenstone.gatherer.gui.RenamePrompt;
import org.greenstone.gatherer.gui.tree.DragTree;
import org.greenstone.gatherer.remote.RemoteGreenstoneServer;
import org.greenstone.gatherer.util.DragComponent;
import org.greenstone.gatherer.util.Utility;
import org.greenstone.gatherer.DebugStream;

/** Manages the moving of files within a separate thread.
 * @author John Thompson, NZDL Project, University of Waikato
 */
public class FileManager
{
    /** Not only the queue of files to be moved, but also the object that moves them. */
    static private FileQueue file_queue = null;

    public static final int COPY = 0;
    public static final int MOVE = 1;

    public static final int FILE_TYPE = 0;
    public static final int FOLDER_TYPE = 1;
    protected static File startup_directory = null;


    /** Constructor.
     * @see org.greenstone.gatherer.file.FileQueue
     */
    public FileManager()
    {
    file_queue = new FileQueue();
    file_queue.start();
    }


    /** 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)
    {
    // Check there is something to do
    if (source_nodes == null || source_nodes.length == 0) {
        return;
    }

    // We need a unique ID for each file task
    long id = System.currentTimeMillis();

    // If source and target are the same we're moving
    if (source == target) {
        // Start a new move FileTask and we're done
        (new FileTask(id, source, source_nodes, target, target_node, FileJob.MOVE)).start();
        return;
    }

    // If target isn't the RecycleBin, we're copying
    if (!(target instanceof RecycleBin)) {
        // Start a new copy FileTask and we're done
        (new FileTask(id, source, source_nodes, target, target_node, FileJob.COPY)).start();
        return;
    }

    // We're deleting... but first make sure source isn't read-only
    boolean read_only_source = false;

    // The workspace tree is read-only...
    if (source.toString().equals("Workspace")) {
        read_only_source = true;

        // ...except for files from the "Downloaded Files" folder
        String downloaded_files_folder_path = Gatherer.getGLIUserCacheDirectoryPath();
        for (int i = 0; i < source_nodes.length; i++) {
        // Is this the "Downloaded Files" folder?
        if (source_nodes[i].getFile().getAbsolutePath().startsWith(downloaded_files_folder_path)) {
            read_only_source = false;
        }
        }
    }

    // The source is read-only, so tell the user and abort
    if (read_only_source) {
        JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.Read_Only"), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
        return;
    }

    // Start a new delete FileTask and we're done
    (new FileTask(id, source, source_nodes, target, target_node, FileJob.DELETE)).start();
    }

    /** For moving and copying of folders. */
    public void action(File sourceFolder, File targetFolder, int operation) {
    (new SimpleFileTask(sourceFolder, targetFolder, operation)).start();
    }
    

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

    /** Performs the simple file task of moving or copying folders. */
    private class SimpleFileTask
    extends Thread
    {
    private File sourceFolder;
    private File targetFolder;
    int operation; // MOVE or COPY

    public SimpleFileTask(File sourceFolder, File targetFolder, int operation)
    {
        this.sourceFolder = sourceFolder;       
        this.targetFolder = targetFolder;
        this.operation = operation;
    }


    public void run()
    {
        // check if we're moving or overwriting the current collection
        String currentColPath = Gatherer.getCollectDirectoryPath()+CollectionManager.getLoadedCollectionName();
        if(currentColPath.equals(sourceFolder.getAbsolutePath()) 
           || currentColPath.equals(targetFolder.getAbsolutePath())) {
        Gatherer.g_man.saveThenCloseCurrentCollection();
        }
        
        // if moving, try a simple move operation (if it works, it
        // shouldn't take long at all and doesn't need a progress bar)
        if(operation == MOVE && sourceFolder.renameTo(targetFolder)) {
        //System.err.println("**** A simple renameTo() worked.");
        WorkspaceTreeModel.refreshGreenstoneCollectionsNode();
        return;
        }

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

        String status = "FileActions.Moving";
        if(operation == COPY) {
        status = "FileActions.Copying";     
        }
        progress_bar.setString(Dictionary.get(status));
        file_queue.getFileStatus().setText(Dictionary.get(status,
                                  file_queue.formatPath(status,
                                     sourceFolder.getAbsolutePath(), 
                                     file_queue.getFileStatus().getSize().width)));

        // do the move or copy operation
        try {
        //System.err.println("**** Copying " + sourceFolder + " to: " + targetFolder);
        file_queue.copyDirectoryContents(sourceFolder, targetFolder);       
        } catch(Exception e) {
        JOptionPane.showMessageDialog(Gatherer.g_man, e.getMessage(), 
                          "Can't perform file operation", JOptionPane.ERROR_MESSAGE);

        progress_bar.setIndeterminate(false);
        progress_bar.clear();
        return;
        }
        
        // if moving, delete the original source folder and
        // update the docs in GS collections node in the workspace tree
        
        if(operation == MOVE) {
        Utility.delete(sourceFolder);
        WorkspaceTreeModel.refreshGreenstoneCollectionsNode();
        }


        progress_bar.setIndeterminate(false);
        progress_bar.clear();
        file_queue.getFileStatus().setText(Dictionary.get("FileActions.No_Activity"));
        progress_bar.setString(Dictionary.get("FileActions.No_Activity"));
    }
    }

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


    public FileTask(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()
    {
        // Reset the progress bar and set it to indeterminate while calculating its size
        GProgressBar progress_bar = file_queue.getProgressBar();
        progress_bar.reset();
        progress_bar.setIndeterminate(true);

        // Calculate the progress bar size
        boolean cancelled = file_queue.calculateSize(source_nodes);
        if (!cancelled) {
        file_queue.addJob(id, source, source_nodes, target, target_node, type);
        if (Gatherer.isGsdlRemote) {
            String collection_name = CollectionManager.getLoadedCollectionName();

            // Perform the appropriate action based on the job type (RemoteGreenstoneServer will queue)
            if (type == FileJob.COPY) {
            // Copies: upload all the files at once in one zip file
            File[] source_files = new File[source_nodes.length];
            for (int i = 0; i < source_nodes.length; i++) {
                source_files[i] = source_nodes[i].getFile();
            }
            Gatherer.remoteGreenstoneServer.uploadFilesIntoCollection(collection_name, source_files, target_node.getFile());
            }
            else if (type == FileJob.DELETE) {
            // Deletes: delete each top-level file/directory one at a time
            for (int i = 0; i < source_nodes.length; i++) {
                Gatherer.remoteGreenstoneServer.deleteCollectionFile(collection_name, source_nodes[i].getFile());
            }
            }
            else if (type == FileJob.MOVE) {
            // Moves: move each top-level file/directory one at a time
            for (int i = 0; i < source_nodes.length; i++) {
                Gatherer.remoteGreenstoneServer.moveCollectionFile(
                                     collection_name, source_nodes[i].getFile(), target_node.getFile());
            }
            }
        }
        }

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

    public void explodeMetadataDatabase(File file)
    {
    // This must go in a separate thread because we need the progress bar to work (remote Greenstone server)
    new ExplodeMetadataDatabasePromptTask(file).start();
    }

    // Works with replace_srcdoc_with_html.pl
    public void replaceSrcDocWithHtml(File[] files)
    {
    // This must go in a separate thread because we need the progress bar to work (remote Greenstone server)
    new ReplaceSrcDocWithHtmlPromptTask(files).start();
    }

    private class ExplodeMetadataDatabasePromptTask
    extends Thread
    {
    private File metadata_database_file = null;

    public ExplodeMetadataDatabasePromptTask(File metadata_database_file)
    {
        this.metadata_database_file = metadata_database_file;
    }

    public void run()
    {
        ExplodeMetadataDatabasePrompt emp = new ExplodeMetadataDatabasePrompt(metadata_database_file);
    }
    }

    // Works with replace_srcdoc_with_html.pl
    private class ReplaceSrcDocWithHtmlPromptTask
    extends Thread
    {
    private File[] replace_these_srcdoc_files = null;

    public ReplaceSrcDocWithHtmlPromptTask(File[] replace_these_srcdoc_files)
    {
        this.replace_these_srcdoc_files = replace_these_srcdoc_files;
    }

    public void run()
    {
        ReplaceSrcDocWithHtmlPrompt prompt = new ReplaceSrcDocWithHtmlPrompt(replace_these_srcdoc_files);
    }
    }


    public void openFileInExternalApplication(File file)
    {
    // This must go in a separate thread because we need the progress bar to work (remote Greenstone server)
    new OpenFileInExternalApplicationTask(file).start();
    }


    private class OpenFileInExternalApplicationTask
    extends Thread
    {
    private File file = null;

    public OpenFileInExternalApplicationTask(File file)
    {
        this.file = file;
    }

    public void run()
    {
        // If we're using a remote Greenstone server, we need to download the file before viewing it...
        if (Gatherer.isGsdlRemote) {
        // ... but only if it is inside the collection and we haven't already downloaded it
        if (file.getAbsolutePath().startsWith(Gatherer.getCollectDirectoryPath()) && file.length() == 0) {
            if (Gatherer.remoteGreenstoneServer.downloadCollectionFile(
                                 CollectionManager.getLoadedCollectionName(), file).equals("")) {
            // Something has gone wrong downloading the file
            return;
            }
        }
        }

        // View the file in an external application
        Gatherer.spawnApplication(file);
    }
    }


    public void newDummyDoc(DragTree tree, CollectionTreeNode parent_node){
    newFolderOrDummyDoc(tree, parent_node, FILE_TYPE);
    }


    public void newFolder(DragTree tree, CollectionTreeNode parent_node) {
    newFolderOrDummyDoc(tree, parent_node, FOLDER_TYPE);
    }


    protected void newFolderOrDummyDoc(DragTree tree, CollectionTreeNode parent_node, int type) {
    (new NewFolderOrDummyDocumentTask(tree, parent_node, type)).start();
    }


    private class NewFolderOrDummyDocumentTask
    extends Thread
    {
    private DragTree tree = null;
    private CollectionTreeNode parent_node = null;
    private int type;

    public NewFolderOrDummyDocumentTask(DragTree tree, CollectionTreeNode parent_node, int type)
    {
        this.tree = tree;
        this.parent_node = parent_node;
        this.type = type;
    }

    public void run()
    {
        // Ask the user for the directories name.
        String extension = "";
        if (type == FILE_TYPE) {
        extension = ".nul";
        }

        NewFolderOrFilePrompt new_folder_prompt = new NewFolderOrFilePrompt(parent_node, type, extension);
        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()) { 
            if (type == FILE_TYPE) {
            JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.File_Already_Exists_No_Create", name), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
            }
            else {
            JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.Folder_Already_Exists", name), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
            }
        }
        // Otherwise create it.
        else {
            try {
            if (type == FILE_TYPE) {
                folder_file.createNewFile();
                if (Gatherer.isGsdlRemote) {
                Gatherer.remoteGreenstoneServer.uploadCollectionFile(
                                         CollectionManager.getLoadedCollectionName(), folder_file);
                }
            }
            else {
                folder_file.mkdirs();
                if (Gatherer.isGsdlRemote) {
                Gatherer.remoteGreenstoneServer.newCollectionDirectory(
                                         CollectionManager.getLoadedCollectionName(), folder_file);
                }
            }

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

            // Refresh workspace tree (collection tree is done automatically)
            Gatherer.g_man.refreshWorkspaceTree(DragTree.COLLECTION_CONTENTS_CHANGED);
            }
            catch (Exception exception) {
            if (type == FILE_TYPE) {
                JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.File_Create_Error", name), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
            }
            else {
                JOptionPane.showMessageDialog(Gatherer.g_man, Dictionary.get("FileActions.Folder_Create_Error", name), Dictionary.get("General.Error"), JOptionPane.ERROR_MESSAGE);
            }
            }
        }
        
        folder_file = null;
        model = null;
        }
        name = null;
    }
    }


    public void renameCollectionFile(CollectionTree collection_tree, CollectionTreeNode collection_tree_node)
    {
    // This must go in a separate thread because we need the progress bar to work (remote Greenstone server)
    new RenameTask(collection_tree, collection_tree_node).start();
    }


    private class RenameTask
    extends Thread
    {
    private CollectionTree collection_tree = null;
    private CollectionTreeNode collection_tree_node = null;

    public RenameTask(CollectionTree collection_tree, CollectionTreeNode collection_tree_node)
    {
        this.collection_tree = collection_tree;
        this.collection_tree_node = collection_tree_node;
    }

    public void run()
    {
        RenamePrompt rename_prompt = new RenamePrompt(collection_tree_node);
        String new_collection_file_name = rename_prompt.display();
        rename_prompt.dispose();
        rename_prompt = null;

        if (new_collection_file_name != null) {
        File collection_file = collection_tree_node.getFile();
        File new_collection_file = new File(collection_file.getParentFile(), new_collection_file_name);
        CollectionTreeNode new_collection_tree_node = new CollectionTreeNode(new_collection_file);
        file_queue.addJob(System.currentTimeMillis(), collection_tree, new FileNode[] { collection_tree_node }, collection_tree, new_collection_tree_node, FileJob.RENAME);
        if (Gatherer.isGsdlRemote) {
            Gatherer.remoteGreenstoneServer.moveCollectionFile(
                             CollectionManager.getLoadedCollectionName(), collection_file, new_collection_file);
        }
        }
    }
    }

    public void replaceCollectionFile(CollectionTree collection_tree, CollectionTreeNode collection_tree_node)
    {
    // This must go in a separate thread because we need the progress bar to work (remote Greenstone server)
    new ReplaceTask(collection_tree, collection_tree_node).start();
    }


    private class ReplaceTask
    extends Thread implements FileCopiedSuccessListener
    {
    private CollectionTree collection_tree = null;
    private CollectionTreeNode collection_tree_node = null;

    public ReplaceTask(CollectionTree collection_tree, CollectionTreeNode collection_tree_node)
    {
        this.collection_tree = collection_tree;
        this.collection_tree_node = collection_tree_node;
    }

    public void run()
    {
        JFileChooser file_chooser = new JFileChooser(startup_directory);
        file_chooser.setDialogTitle(Dictionary.get("ReplacePrompt.Title"));
        File new_file = null;
        int return_val = file_chooser.showOpenDialog(null);
        if(return_val == JFileChooser.APPROVE_OPTION) {
        new_file = file_chooser.getSelectedFile();
        }
        
        if (new_file == null) {
        return;
        }
        
        // save the search path for next time
        startup_directory = new_file.getParentFile();
        // make up a node for the file to bring in
        WorkspaceTreeNode source_node = new WorkspaceTreeNode(new_file);

        //DebugStream.setDebugging(true, "FileManager.ReplaceTask");

        // Some different handling if the old and new tail file names are the same and target file goes into the same
        // location in collection tree as source.
        // This avoids past errors upon replacing with same filename (diff file contents) where the attached meta gets lost,
        // or remote file gets updated but file gone missing in client-GLI view until collection reopened.
        boolean isSameLeafName = false;
        if(collection_tree_node.getFile().getName().equals(new_file.getName())) {
        DebugStream.println(" @@@ File Replace: New file has the same name as existing.");
        isSameLeafName = true;
        }
        
        File target_directory = collection_tree_node.getFile().getParentFile();
        CollectionTreeNode new_collection_tree_node = new CollectionTreeNode(new File(target_directory, new_file.getName()));
        
        FileNode parent = (FileNode)collection_tree_node.getParent(); // store the original source's parent, need it several times after changing source

        if(isSameLeafName) {
        // If the file name of the replacing file IS the same as the one being replaced
        // perform a COPY operation, which will copy across metadata too, after confirming whether the user really wants to replace the source with identically named target

        // (a) First, this instance of ReplaceTask and no other starts listening to whether the user
        // DIDN'T CANCEL out of an identical filename copy operation and if this local file copy
        // was a success. If so, on successful file copy event fired (only then), the source file
        // from the workspace tree will also be uploaded to the remote GS3 
        file_queue.addFileCopiedSuccessListener(this); 

        // (b) Now can finally add the COPY job to the queue
        file_queue.addJob(System.currentTimeMillis(), Gatherer.g_man.gather_pane.workspace_tree, new FileNode[] { source_node }, collection_tree, parent, FileJob.COPY);
        
        } else {
        // If the file name of the replacing file is NOT the same as the one being replaced
        // (a) copy the new file in - but don't bring metadata
        file_queue.addJob(System.currentTimeMillis(), Gatherer.g_man.gather_pane.workspace_tree, new FileNode[] { source_node }, collection_tree, parent, FileJob.COPY_FILE_ONLY);
        
        // (b) final step to finish off: do a replace of old file with new file
        file_queue.addJob(System.currentTimeMillis(), collection_tree, new FileNode[] { collection_tree_node }, collection_tree, new_collection_tree_node, FileJob.REPLACE);
        }


        //DebugStream.setDebugging(false, "FileManager.ReplaceTask");
    }
    
    
    /** In order to detect that the user cancelled out of replacing an identically named target file, 
     * we now listen to events fired that the file was successfully copied across. Only then do we
     * bother transferring the source file (from the workspace) into the target location in the
     * collection on the remote file system. We don't do this if the user cancelled.
     */
    public void fileCopiedSuccessfully(File new_file) {     
        
        //DebugStream.setDebugging(true, "FileManager.ReplaceTask.fileCopiedSuccessfully");
        
        if (Gatherer.isGsdlRemote) {
        File target_directory = this.collection_tree_node.getFile().getParentFile();
        File collection_tree_node_file = this.collection_tree_node.getFile();
        
        String collection_name = CollectionManager.getLoadedCollectionName();
        Gatherer.remoteGreenstoneServer.deleteCollectionFile(collection_name, collection_tree_node_file);
        Gatherer.remoteGreenstoneServer.uploadFilesIntoCollection(collection_name, new File[] { new_file }, target_directory);
        }

        // stop listening to further events fired now that we've handled this event successfully
        file_queue.removeFileCopiedSuccessListener(this);
        //DebugStream.setDebugging(false, "FileManager.ReplaceTask.fileCopiedSuccessfully");
    }
    }
}