001/*
002 * Copyright (c) 2009-2010 The Regents of the University of California.
003 * All rights reserved.
004 *
005 * '$Author: aschultz $'
006 * '$Date: 2010-12-23 19:01:04 +0000 (Thu, 23 Dec 2010) $' 
007 * '$Revision: 26600 $'
008 * 
009 * Permission is hereby granted, without written agreement and without
010 * license or royalty fees, to use, copy, modify, and distribute this
011 * software and its documentation for any purpose, provided that the above
012 * copyright notice and the following two paragraphs appear in all copies
013 * of this software.
014 *
015 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
016 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
017 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
018 * THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
019 * SUCH DAMAGE.
020 *
021 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
022 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
024 * PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
025 * CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
026 * ENHANCEMENTS, OR MODIFICATIONS.
027 *
028 */
029
030package org.kepler.gui;
031
032/**
033 * A singleton class to keep track of whether or not the PreferencesFrame is
034 * currently open or not.
035 * 
036 * @author Aaron Schultz
037 */
038public class PreferencesFrameTracker {
039        private static class PreferencesFrameTrackerHolder {
040                private static final PreferencesFrameTracker INSTANCE = new PreferencesFrameTracker();
041        }
042
043        /**
044         * A boolean that is true if the PreferencesFrame is open, and false if it
045         * is not.
046         */
047        private boolean open = false;
048        private PreferencesFrame pFrame = null;
049
050        public PreferencesFrameTracker() {
051        }
052
053        public PreferencesFrame getPreferencesFrame() {
054                return pFrame;
055        }
056
057        public boolean isOpen() {
058                if (open && pFrame != null) {
059                        return true;
060                } else {
061                        open = false;
062                        return false;
063                }
064        }
065
066        public void setOpen(PreferencesFrame prefFrame) {
067                this.pFrame = prefFrame;
068                this.open = true;
069        }
070
071        public void setClosed() {
072                open = false;
073                pFrame = null;
074        }
075
076        /**
077         * Method for getting an instance of this singleton class.
078         */
079        public static PreferencesFrameTracker getInstance() {
080                return PreferencesFrameTrackerHolder.INSTANCE;
081        }
082
083}