source: trunk/gsdl3/src/java/org/greenstone/admin/gui/LogPane.java@ 10953

/**
 *#########################################################################
 *
 * 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: Chi-Yu Huang, Greenstone Digital Library, University of Waikato
 * Modified: 03.2005
 *
 * <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.admin.gui;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;

import org.greenstone.admin.GAIManager;
import org.greenstone.admin.GAI;
import org.greenstone.admin.Configuration;

/** The Log pane is to view the status of relevant log files in GSIII
 * @author Chi-Yu Huang, Greenstone Digital Library, University of Waikato
 * @version
 */
public class LogPane
    extends JPanel
    implements ActionListener {

    /* The pane to demonstrate log information, including  the log files being 
     *monitored and their content*/
    protected JSplitPane main_log_pane = null;

    /** The panel that contains a log_list */
    private JPanel logList_pane =  null;

    /** The panel that contains the log content. */
    private JPanel logContent_pane =  null;

    /** The List showing all the log files concerned. */
    private JList log_list=null;

    /** The scrollable area into which the log content is placed. */
    private JScrollPane log_content = null;

    /** The label at the top of the logList_pane. */
    private JLabel logList_label =  null;

    /** The label shown at the top of the logContent Pane. */
    private JLabel logContent_label  =  null;

    /* Log TEXT AREA*/
    private JTextArea log_textarea = null;

    // The control buttons used to manipulate log Pane
    protected JPanel button_pane = null;
    
    /** Buttons */
    private JButton reload_button = null;
    private JButton clear_button = null;

    /*The pane which contains the controls for log files */
    private JPanel control_pane = null;

    private File log_file = null;
      
    /** The various sizes for the screen layout*/
    static private Dimension MIN_SIZE = new Dimension( 90,  90);
    static private Dimension LIST_SIZE  = new Dimension(200, 450);
    static private Dimension LOGPANE_SIZE = new Dimension (800,450);

    //Constructor
    public LogPane() {
    
    // create all the necessary panes
    control_pane = new JPanel();
    button_pane = new JPanel();

    // Log_Pane
    main_log_pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
    main_log_pane.setPreferredSize(LOGPANE_SIZE);
    //log_pane.setSize(LOGPANE_SIZE);
    
    // Log_list
    String[] log_files = { "Tomcat log file", "Log file 2", "Log file 3"};
    log_list = new JList(log_files);
    log_list.setBorder(BorderFactory.createLoweredBevelBorder());
    log_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    log_list.setVisibleRowCount(4);
    log_list.setBackground (Configuration.getColor("coloring.workspace_tree_background"));
    log_list.setForeground (Configuration.getColor("coloring.workspace_tree_foreground"));
    log_list.addListSelectionListener(new LogListListener());
    
    // Log_TextArea
    log_textarea = new JTextArea();
    log_textarea.setEditable(false);
        
    // Buttons
    ReloadButtonListener rbl = new ReloadButtonListener();
    ClearButtonListener dbl = new ClearButtonListener();
    ImageIcon reloadButtonIcon = new ImageIcon(GAI.images_path + "toolbarButtonGraphics/general/Refresh16.gif");
    ImageIcon clearButtonIcon = new ImageIcon(GAI.images_path + "toolbarButtonGraphics/general/Delete16.gif");

    //reload_button = new JButton("Reload", reloadButtonIcon);
    reload_button = new JButton();
    reload_button.addActionListener(rbl);
    reload_button.setEnabled(false);
    reload_button.setMnemonic(KeyEvent.VK_R);
    reload_button.setText(GAI.dictionary.get("LogPane.Reload_Log"));
    reload_button.setToolTipText(GAI.dictionary.get("LogPane.Reload_Log_Tooltip"));

    clear_button = new JButton();
    clear_button.addActionListener(dbl);
    clear_button.setEnabled(false);
    clear_button.setMnemonic(KeyEvent.VK_C);
    clear_button.setText(GAI.dictionary.get("LogPane.Clear_Log"));
    clear_button.setToolTipText(GAI.dictionary.get("LogPane.Clear_Log_Tooltip"));

    rbl = null;
    dbl = null;
    }

    /** Any implementation of ActionListener requires this method so that when an 
     **action is performed the appropriate effect can occur.*/

    public void actionPerformed(ActionEvent event) {
    }


    /** This method is callsed to actually layout the components.*/
    public void display() {
    // Create Components.
    //KeyListenerImpl key_listener = new KeyListenerImpl();
    //MouseListenerImpl mouse_listener = new MouseListenerImpl();
    //this.addKeyListener(key_listener);

    // logList_Pane
    logList_pane = new JPanel();
    logList_pane.setBorder(BorderFactory.createLoweredBevelBorder());
    logList_label = new JLabel();
    logList_label.setOpaque(true);
    logList_label.setBackground(Configuration.getColor("coloring.workspace_heading_background"));
    logList_label.setForeground(Configuration.getColor("coloring.workspace_heading_foreground"));
    logList_label.setText(GAI.dictionary.get("LogPane.Log_List"));

    // logContent_Pane
    logContent_pane = new JPanel();
    logContent_pane.setBorder(BorderFactory.createLoweredBevelBorder());
    logContent_pane.setBackground(Configuration.getColor("coloring.workspace_selection_background"));
    logContent_pane.setForeground(Configuration.getColor("coloring.workspace_selection_foreground"));
    logContent_label = new JLabel();
    logContent_label.setOpaque(true);
    logContent_label.setBackground(Configuration.getColor("coloring.workspace_selection_background"));
    logContent_label.setForeground(Configuration.getColor("coloring.workspace_selection_foreground"));
    logContent_label.setText(GAI.dictionary.get("LogPane.Log_Content"));
    
    // TEXTAREA Layout
    log_content = new JScrollPane(log_textarea);

    // Button Layout 
    button_pane.setLayout (new GridLayout(1,3));
    button_pane.add(reload_button);
    button_pane.add(clear_button);
    
    control_pane.setLayout (new BorderLayout());
    //control_pane.setBorder(BorderFactory.createLoweredBevelBorder());
    control_pane.setBorder(BorderFactory.createEmptyBorder(05,10,5,10));
    control_pane.setPreferredSize(new Dimension(50,50));
    control_pane.setSize(new Dimension(50,50));
    control_pane.add (button_pane, BorderLayout.CENTER);

    // Layout Components
    logList_pane.setLayout(new BorderLayout());
    logList_pane.add(log_list, BorderLayout.CENTER);
    logList_pane.add(logList_label, BorderLayout.NORTH);
        
    logContent_pane.setLayout(new BorderLayout());
    logContent_pane.add(log_content,BorderLayout.CENTER);
    logContent_pane.add(logContent_label, BorderLayout.NORTH);
    logContent_pane.add(control_pane, BorderLayout.SOUTH);
    
    main_log_pane.add(logList_pane, JSplitPane.LEFT);
    main_log_pane.add(logContent_pane, JSplitPane.RIGHT);
    main_log_pane.setDividerLocation(LIST_SIZE.width - 10);
    
    this.setLayout(new BorderLayout());
    this.add(main_log_pane, BorderLayout.CENTER);
    //this.add(control_pane, BorderLayout.SOUTH);
    }

    /** Called whenever this pane gains focus, this method ensures that the various 
     **tree renderers are correctly colouring the tree (as these settings sometimes get lost).
     * @param event A <strong>FocusEvent</strong> containing details about the focus action performed.
     */
    /*public void focusGained(FocusEvent event) {
    DefaultTreeCellRenderer def = new DefaultTreeCellRenderer();
    DefaultTreeCellRenderer w = (DefaultTreeCellRenderer)workspace_tree.getCellRenderer();
    DefaultTreeCellRenderer c = (DefaultTreeCellRenderer)collection_tree.getCellRenderer();
    if(event.getSource() == workspace_tree) {
        w.setBackgroundSelectionColor(def.getBackgroundSelectionColor());
        c.setBackgroundSelectionColor(Color.lightGray);
    }
    else if(event.getSource() == collection_tree) {
        c.setBackgroundSelectionColor(def.getBackgroundSelectionColor());
        w.setBackgroundSelectionColor(Color.lightGray);
    }
    repaint();
    }*/
    
    /** Implementation side-effect, not used in any way.
     * @param event A <strong>FocusEvent</strong> containing details about the focus action performed.
     */
    /*public void focusLost(FocusEvent event) {
      }*/
    
    /** Called to inform this control panel that it has just gained focus as an effect of the user clicking on its tab.
     */
    public void gainFocus() {
    // Update the meta-audit view to show the current selection, if any.
    //Gatherer.g_man.meta_audit.setRecords(getCollectionTreeSelection());
    }
    
    /** 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);
    workspace_filter.setEditable(mode > Configuration.LIBRARIAN_MODE);
    }*/
    
    private class KeyListenerImpl
    extends KeyAdapter {
    private boolean vk_left_pressed = false;
    public void keyReleased(KeyEvent event) {
    }
    // we need to watch for left clicks on an unopened folder - should shift the focus to the
    //parent folder. But because there is some other mysterious key listener that does opening and 
    //closing folders on right and left clicks, we must detect the situation before the other handler 
    //has done its job, and process it after.*/
    public void keyPressed(KeyEvent event) {
        if (event.getKeyCode() == KeyEvent.VK_LEFT) {
        
        }
    }     
    }

    /** This class listens for mouse clicks and responds right mouse button clicks (popup menu)., left
     **  mouse button:log file selected */
    private class MouseListenerImpl
    extends MouseAdapter {
    /* Any subclass of MouseAdapter can override this method to respond to mouse click events. 
     *In this case we want to open a pop-up menu if we detect a right mouse click over one of our 
     *registered components, and start an external application if someone double clicks on a certain 
     *file record. */
    public void mouseReleased(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    
    }
    
    /** This class serves as the listener for actions on the build button. */
    private class ReloadButtonListener
    implements ActionListener {
    /** As the log files could be modified in the runtime environment
     *  This button is to reload the log file whenever user want to */
    public void actionPerformed(ActionEvent event) {
        // Remember that for lower thresholds the above doesn't work, so try this instead
        reload_button.setEnabled(true);
        clear_button.setEnabled(true);
        updateLogsContent(log_file.getPath());
    }
    }
    
    private class ClearButtonListener
    implements ActionListener {
    public void actionPerformed(ActionEvent event) {
        if (!log_file.exists()){
        JOptionPane.showMessageDialog((Component) null,log_file.getPath() + " log file does not exist");
        return;
        } else {
        ClearLogFilePrompt cfp  = new ClearLogFilePrompt();
        boolean file_cleared = cfp.display(log_file);
        if (file_cleared) {
            log_textarea.setText("");
        }
        }
        clear_button.setEnabled(false);
    }
    }
    
    public void updateLogsContent(String filename){
    if (!log_file.exists()){ 
        log_textarea.setText("");
        JOptionPane.showMessageDialog((Component) null, filename+" log file does not exist");  
        clear_button.setEnabled(false);
    } else {
        readFile(filename);
    }
    }

    public void readFile (String filename) {
    log_textarea.setText("");
    String fileLine;
    try {
        BufferedReader in = new BufferedReader(new FileReader(filename));
        while ((fileLine = in.readLine()) != null) {
        log_textarea.append(fileLine);
        log_textarea.append("\n");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }       
    }
   
    private class LogListListener implements ListSelectionListener {
    public void valueChanged (ListSelectionEvent e){
        if (e.getValueIsAdjusting() == false){
        if (log_list.getSelectedIndex() == -1){
            //no selection
        } else if (log_list.getSelectedIndex () == 0 ) {
            log_file = new File (GAI.tomcat_home+File.separatorChar+"logs"+File.separatorChar+"catalina.out");
            String filename = log_file.getPath();
            updateLogsContent(filename);
            reload_button.setEnabled(true);
            clear_button.setEnabled(true);
        } else if (log_list.getSelectedIndex () == 1) {
            log_textarea.setText("");
            JOptionPane.showMessageDialog((Component) null,"This file has not been defined yet");   
            clear_button.setEnabled(false);
            reload_button.setEnabled(false);
        } else if (log_list.getSelectedIndex () == 2) {
            log_textarea.setText("");
            JOptionPane.showMessageDialog((Component) null,"This file has not been defined yet");   
            clear_button.setEnabled(false);
            reload_button.setEnabled(false);
        }
        }
    }
    }
    public void modeChanged (int mode){
    return;
    }
    public void afterDisplay() {
    return;
    }
}