source: gli/trunk/src/org/greenstone/gatherer/gui/EnrichPane.java@ 18199

/**
 *############################################################################
 * A component of the Greenstone Librarian Interface, part of the Greenstone
 * digital library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: Michael Dewsnip, NZDL Project, University of Waikato, NZ
 * Based on code by John Thompson
 *
 * Copyright (C) 2005 New Zealand Digital Library Project
 *
 * 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.
 *
 * 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.
 *
 * 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.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.tree.*;
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.CollectionTree;
import org.greenstone.gatherer.collection.CollectionTreeNode;
import org.greenstone.gatherer.gui.tree.DragTree;
import org.greenstone.gatherer.metadata.MetadataElement;
import org.greenstone.gatherer.metadata.MetadataValue;
import org.greenstone.gatherer.metadata.MetadataValueTableEntry;
import org.greenstone.gatherer.metadata.MetadataValueTreeNode;
import org.greenstone.gatherer.metadata.MetadataXMLFileManager;


/** Provides a view of controls for the editing of metadata.
 */
public class EnrichPane
    extends JPanel
    implements TreeSelectionListener
{
    static private Dimension MINIMUM_SIZE = new Dimension(100, 100);
    static private Dimension COLLECTION_TREE_SIZE = new Dimension(250, 500);

    private boolean has_focus = false;
    /** The collection tree. */
    private CollectionTree collection_tree = null;
    /** The currently reported selection. */
    private CollectionTreeNode[] file_nodes = null;
    /** Used to dynamically filter the collection tree. */
    private Filter collection_filter = null;
    /** The label at the top of the collection tree, which shows the collection name. */
    private JLabel collection_label;
    /** The panel that contains the collection tree. */
    private JPanel collection_pane = null;
    /** The scrollable area into which the collection tree is placed. */
    private JScrollPane collection_scroll = null;
    /** The splitpane dividing the collection tree and the metadata editing controls. */
    private JSplitPane external_split;
    /** The metadata value table shows the metadata values that are currently assigned to a file. */
    private MetadataValueTablePane metadata_value_table_pane = null;
    /** The metadata value tree shows the metadata values that are currently assigned to a metadata element. */
    private MetadataValueTreePane metadata_value_tree_pane = null;


    public EnrichPane()
    {
    // Create the metadata value tree pane
    metadata_value_tree_pane = new MetadataValueTreePane();
    metadata_value_tree_pane.addMetadataValueTreeSelectionListener(new MetadataValueTreeSelectionListener());

    // Create metadata value table pane
    metadata_value_table_pane = new MetadataValueTablePane();
    metadata_value_table_pane.addMetadataValueTableListSelectionListener(new MetadataValueTableListSelectionListener());
    metadata_value_table_pane.addMetadataValueTableMouseListener(new MetadataValueTableMouseListener());
    metadata_value_table_pane.addMetadataValueTextFieldDocumentListener(new MetadataValueTextFieldDocumentListener());
    metadata_value_table_pane.addMetadataValueTextFieldKeyListener(new MetadataValueTextFieldKeyListener());
    }


    /** Some actions can only occur after this panel has been displayed on-screen, so this method is provided to do exactly that. Such actions include the proportioning of the split panes and the setting of table column widths.
     */
    public void afterDisplay()
    {
    external_split.setDividerLocation(0.3);
    }


    /** Used to create, connect and layout the components to be shown on this control panel.
     * @see org.greenstone.gatherer.Gatherer
     * @see org.greenstone.gatherer.file.FileOpenActionListener
     * @see org.greenstone.gatherer.gui.Filter
     */
    public void display()
    {
    JPanel left_hand_pane = new JPanel(new BorderLayout());
    GLIButton metadata_set_button = new GLIButton(Dictionary.get("EnrichPane.ManageMetadataSets"), Dictionary.get("EnrichPane.ManageMetadataSets_Tooltip"));
    metadata_set_button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            MetadataSetDialog msd = new MetadataSetDialog();
            if (msd.setsChanged()) {
            valueChanged(null);
            } 
        }
        });
    
    // Collection Tree
    collection_pane = new JPanel(new BorderLayout());
    collection_pane.setMinimumSize(MINIMUM_SIZE);
    collection_pane.setPreferredSize(COLLECTION_TREE_SIZE);

    collection_label = new JLabel(Dictionary.get("Collection.No_Collection"));
    collection_label.setOpaque(true);

    collection_tree = Gatherer.c_man.getCollectionTree();
    collection_tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION);
    collection_tree.addTreeSelectionListener(this);
    collection_filter = collection_tree.getFilter();

    external_split = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);

    // Layout
    collection_pane.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createEmptyBorder(3,3,3,3), BorderFactory.createLoweredBevelBorder()));
    collection_pane.setMinimumSize(MINIMUM_SIZE);
    collection_pane.setPreferredSize(new Dimension(Gatherer.g_man.getSize().width / 3, Gatherer.g_man.getSize().height));

    // Collection Pane
    collection_pane.add(collection_label, BorderLayout.NORTH);

    JSplitPane metadata_editing_pane = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
    metadata_editing_pane.setBorder(BorderFactory.createEmptyBorder(0,5,5,5));
    metadata_editing_pane.setDividerSize(8);

    metadata_editing_pane.add(metadata_value_table_pane, JSplitPane.TOP);
    metadata_editing_pane.add(metadata_value_tree_pane, JSplitPane.BOTTOM);
    metadata_editing_pane.setDividerLocation(250);

    left_hand_pane.add(collection_pane, BorderLayout.CENTER);
    left_hand_pane.add(metadata_set_button, BorderLayout.SOUTH);
    external_split.add(left_hand_pane, JSplitPane.LEFT);
    external_split.add(metadata_editing_pane, JSplitPane.RIGHT);


    
    this.setLayout(new BorderLayout());
    this.add(external_split, BorderLayout.CENTER);
    }


    /** Called to inform this pane that it has just gained focus as an effect of the user clicking on its tab
     */
    public void gainFocus()
    {
    // Remember that we currently have focus
    has_focus = true;

    // Add the collection tree and filter back into this pane
    collection_scroll = new JScrollPane(collection_tree);
    collection_pane.add(collection_scroll, BorderLayout.CENTER);
    collection_pane.add(collection_filter, BorderLayout.SOUTH);

    // Select the first node in the tree if nothing is already selected
    if (collection_tree.getSelectionPaths() == null && collection_tree.getRowCount() > 0) {
        collection_tree.setImmediate(true);
        collection_tree.setSelectionRow(0);
        collection_tree.setImmediate(false);
        return;
    }

    // Force all of the controls to be updated
    valueChanged(null);
    }


    /** Called to inform this pane that it has just lost focus as an effect of the user clicking on another tab
     */
    public void loseFocus()
    {
    // Very important: make sure metadata value is saved before leaving the pane
    metadata_value_table_pane.stopEditingAndRebuild(file_nodes);

    // Make sure all the metadata has been saved to file
    MetadataXMLFileManager.saveMetadataXMLFiles();

    // Remove the collection tree and filter from this pane so it can be added to the Gather pane
    collection_pane.remove(collection_scroll);
    collection_pane.remove(collection_filter);

    // Remember that we no longer have focus
    has_focus = false;
    }


    /** Called whenever the detail mode changes to ensure the filters are at an appropriate level (ie only editable by those that understand regular expression matching)
     * @param mode the mode level as an int
     */
    public void modeChanged(int mode)
    {
    collection_filter.setEditable(mode > Configuration.LIBRARIAN_MODE);
    }


    /** Refresh this pane, depending on what has just happened (refresh_reason). */
    public void refresh(int refresh_reason, boolean collection_loaded)
    {
    if (collection_loaded) {
        // Update collection label
        collection_label.setText(Dictionary.get("Collection.Collection"));
        collection_label.setBackground(Configuration.getColor("coloring.collection_heading_background", false));
        collection_label.setForeground(Configuration.getColor("coloring.collection_heading_foreground", false));

        // Update collection tree
        if (refresh_reason == Gatherer.COLLECTION_OPENED) {
        collection_tree.setModel(Gatherer.c_man.getCollectionTreeModel());
        }

        // Update collection filter
        collection_filter.setBackground(Configuration.getColor("coloring.collection_heading_background", false));
    }
    else {
        // Update collection label
        collection_label.setText(Dictionary.get("Collection.No_Collection"));
        collection_label.setBackground(Color.lightGray);
        collection_label.setForeground(Color.black);

        // Update collection tree
        collection_tree.setModel(new DefaultTreeModel(new DefaultMutableTreeNode("Error")));

        // Update collection filter
        collection_filter.setBackground(Color.lightGray);
    }

    // Enable or disable the controls
    collection_tree.setEnabled(collection_loaded);
    collection_filter.setEnabled(collection_loaded);

    // Force the metadata table to be rebuilt (for switching extracted metadata on or off)
    if (refresh_reason == Gatherer.PREFERENCES_CHANGED) {
        metadata_value_table_pane.stopEditingAndRebuild(file_nodes);
    }
    }


  /** Allows other classes to request the enrich pane to prepare for metadata
   *  saving.
   *  @author John Thompson, DL Consulting Ltd
   */
  public void stopEditingAndRebuild()
  {
    // Update the metadata value table (and consequently, the metadata value tree)
    metadata_value_table_pane.stopEditingAndRebuild(file_nodes);
  }
  /** stopEditingAndRebuild() **/
  
  /** Called whenever the collection tree selection changes. This causes the metadata value table to be rebuilt. */
  public void valueChanged(TreeSelectionEvent event)
    {
    // If we haven't got focus then it must have been a selection in the Gather pane, so don't bother rebuilding
    if (has_focus == false) {
        return;
    }

    // Nothing selected in the collection tree
    if (collection_tree.getSelectionCount() == 0) {
        file_nodes = null;
    }

    // Some files selected in the collection tree
    else {
        TreePath paths[] = collection_tree.getSelectionPaths();
        file_nodes = new CollectionTreeNode[paths.length];
        for (int i = 0; i < paths.length; i++) {
        file_nodes[i] = (CollectionTreeNode) paths[i].getLastPathComponent();
        }
    }

    // Update the metadata value table (and consequently, the metadata value tree)
    metadata_value_table_pane.stopEditingAndRebuild(file_nodes);
    }


    private class MetadataValueTableListSelectionListener
    implements ListSelectionListener
    {
    public void valueChanged(ListSelectionEvent list_selection_event)
    {
        // We only want to handle one event per selection, so wait for the value to stabilise
        if (list_selection_event.getValueIsAdjusting()) {
        return;
        }

        // Update the metadata value tree for the current table selection
        metadata_value_tree_pane.rebuild(metadata_value_table_pane.getSelectedMetadataValueTableEntry());
    }
    }


    private class MetadataValueTableMouseListener
    extends MouseAdapter
    {
    public void mouseClicked(MouseEvent mouse_event)
    {
        // We're only interested in clicks on the inherited column
        if (metadata_value_table_pane.isMouseEventForInheritedMetadataValueTableColumn(mouse_event) == false) {
        return;
        }

        // If the selected metadata is inherited, switch to the folder it came from
        MetadataValueTableEntry selected_metadata_value_table_entry = metadata_value_table_pane.getSelectedMetadataValueTableEntry();
        if (selected_metadata_value_table_entry.isInheritedMetadata()) {
        collection_tree.setSelection(selected_metadata_value_table_entry.getFolderMetadataInheritedFrom());
        }
    }
    }


    private class MetadataValueTextFieldDocumentListener
    implements DocumentListener
    {
    /** Gives notification that an attribute or set of attributes changed */
    public void changedUpdate(DocumentEvent document_event) {
        validate(document_event);
    }

    /** Gives notification that there was an insert into the document */
    public void insertUpdate(DocumentEvent document_event) {
        validate(document_event);
    }

    /** Gives notification that a portion of the document has been removed */
    public void removeUpdate(DocumentEvent document_event) {
        validate(document_event);
    }


    /** Ensures that the value tree is updated in response to changes in the value text field */
    private void validate(DocumentEvent document_event)
    {
        try {
        Document document = document_event.getDocument();
        String metadata_value_string = document.getText(0, document.getLength());
        metadata_value_tree_pane.selectBestPathForMetadataValue(metadata_value_string);
        }
        catch (Exception exception) {
        DebugStream.printStackTrace(exception);
        }
    }
    }


    private class MetadataValueTextFieldKeyListener
    extends KeyAdapter
    {
    /** Gives notification of key events on the text field */
    public void keyPressed(KeyEvent key_event)
    {
        // Tab: Auto-complete what is selected in the metadata value tree
        if (key_event.getKeyCode() == KeyEvent.VK_TAB) {
        MetadataValueTreeNode selected_metadata_value_tree_node = metadata_value_tree_pane.getSelectedMetadataValueTreeNode();
        if (selected_metadata_value_tree_node != null) {
            metadata_value_table_pane.setMetadataValueTextFieldValue(selected_metadata_value_tree_node.getFullValue());
        }

        // We do not want this event to be processed by the table also
        key_event.consume();
        }

        // Enter: save the current value then add a blank row for the selected metadata element
        if (key_event.getKeyCode() == KeyEvent.VK_ENTER) {
        metadata_value_table_pane.stopEditingAndAddBlankRowForSelectedMetadataElement();
        }
    }
    }


    private class MetadataValueTreeSelectionListener
    implements TreeSelectionListener
    {
    public void valueChanged(TreeSelectionEvent tree_selection_event)
    {
        // When a node is selected in the tree, fill the metadata value text field with the selected node's value
        MetadataValueTreeNode selected_metadata_value_tree_node = metadata_value_tree_pane.getSelectedMetadataValueTreeNode();
        if (selected_metadata_value_tree_node != null) {
        metadata_value_table_pane.setMetadataValueTextFieldValue(selected_metadata_value_tree_node.getFullValue());
        }
    }
    }
}