Source Code Cross Referenced for UndoableEditReceiver.java in  » GIS » openjump » com » vividsolutions » jump » workbench » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » openjump » com.vividsolutions.jump.workbench.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI 
003:         * for visualizing and manipulating spatial features with geometry and attributes.
004:         *
005:         * Copyright (C) 2003 Vivid Solutions
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or (at your option) any later version.
011:         * 
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         * 
021:         * For more information, contact:
022:         *
023:         * Vivid Solutions
024:         * Suite #1A
025:         * 2328 Government Street
026:         * Victoria BC  V8T 5G5
027:         * Canada
028:         *
029:         * (250)385-6040
030:         * www.vividsolutions.com
031:         */
032:
033:        package com.vividsolutions.jump.workbench.model;
034:
035:        import java.util.ArrayList;
036:        import java.util.Iterator;
037:
038:        import javax.swing.undo.UndoManager;
039:        import javax.swing.undo.UndoableEdit;
040:
041:        import com.vividsolutions.jts.util.Assert;
042:
043:        /**
044:         * Receives UndoableEdits from PlugIns and CursorTools. Also provides access to
045:         * a Task's UndoManager.
046:         * <P>
047:         * In the documentation, the "receiving phase" refers to the time between the
048:         * calls to #start and #stop.
049:         * <P>
050:         * If there is an exception that leaves this UndoableCommand execution
051:         * partially complete and non-unexecutable, be sure to call
052:         * #reportIrreversibleChange()
053:         */
054:        public class UndoableEditReceiver {
055:            private UndoManager undoManager = new UndoManager();
056:            private ArrayList newUndoableEdits = new ArrayList();
057:            /** Handle nested calls to UndoableEditReceiver */
058:            private int transactions = 0;
059:            private boolean nothingToUndoReported = false;
060:            private boolean irreversibleChangeReported = false;
061:            private boolean undoManagerCouldUndoAtStart = false;
062:            private ArrayList listeners = new ArrayList();
063:
064:            public UndoableEditReceiver() {
065:            }
066:
067:            public void startReceiving() {
068:                transactions++;
069:                setNothingToUndoReported(false);
070:                irreversibleChangeReported = false;
071:                undoManagerCouldUndoAtStart = undoManager.canUndo();
072:            }
073:
074:            /**
075:             * Specifies that the undo history should not be modified at the end of
076:             * the current receiving phase, if neither #receive nor #reportIrreversibleChange
077:             * is called. If none of the three methods are called during the receiving
078:             * phase, an irreversible change is assumed to have occurred, and the
079:             * undo history will be truncated.
080:             */
081:            public void reportNothingToUndoYet() {
082:                Assert.isTrue(isReceiving());
083:                setNothingToUndoReported(true);
084:            }
085:
086:            /**
087:             * Notifies this UndoableEditReceiver that something non-undoable has
088:             * happened. Be sure to call this if an Exception occurs during the execution
089:             * of an UndoableCommand, leaving it partially complete and non-unexecutable.
090:             */
091:            public void reportIrreversibleChange() {
092:                Assert.isTrue(isReceiving());
093:                irreversibleChangeReported = true;
094:            }
095:
096:            public void stopReceiving() {
097:                transactions--;
098:                try {
099:                    if ((newUndoableEdits.isEmpty() && !wasNothingToUndoReported())
100:                            || irreversibleChangeReported) {
101:                        undoManager.discardAllEdits();
102:
103:                        return;
104:                    }
105:
106:                    for (Iterator i = newUndoableEdits.iterator(); i.hasNext();) {
107:                        UndoableEdit undoableEdit = (UndoableEdit) i.next();
108:                        undoManager.addEdit(undoableEdit);
109:                    }
110:                    newUndoableEdits.clear();
111:                } finally {
112:                    fireUndoHistoryChanged();
113:
114:                    if (undoManagerCouldUndoAtStart && !undoManager.canUndo()) {
115:                        fireUndoHistoryTruncated();
116:                    }
117:                }
118:            }
119:
120:            private void fireUndoHistoryTruncated() {
121:                for (Iterator i = listeners.iterator(); i.hasNext();) {
122:                    Listener listener = (Listener) i.next();
123:                    listener.undoHistoryTruncated();
124:                }
125:            }
126:
127:            private void fireUndoHistoryChanged() {
128:                for (Iterator i = listeners.iterator(); i.hasNext();) {
129:                    Listener listener = (Listener) i.next();
130:                    listener.undoHistoryChanged();
131:                }
132:            }
133:
134:            public void add(Listener listener) {
135:                listeners.add(listener);
136:            }
137:
138:            /**
139:             * If the currently executing PlugIn or AbstractCursorTool is not undoable,
140:             * it should simply not call this method; the undo history will be cleared.
141:             */
142:            public void receive(UndoableEdit undoableEdit) {
143:                Assert.isTrue(isReceiving());
144:
145:                //Don't add the UndoableEdit to the UndoManager right away; the caller may
146:                //call #clearNewUndoableEdits. [Jon Aquino]
147:                newUndoableEdits.add(undoableEdit);
148:            }
149:
150:            public UndoManager getUndoManager() {
151:                return undoManager;
152:            }
153:
154:            private void setNothingToUndoReported(boolean nothingToUndoReported) {
155:                this .nothingToUndoReported = nothingToUndoReported;
156:            }
157:
158:            private boolean wasNothingToUndoReported() {
159:                return nothingToUndoReported;
160:            }
161:
162:            public static interface Listener {
163:                public void undoHistoryChanged();
164:
165:                public void undoHistoryTruncated();
166:            }
167:
168:            public boolean isReceiving() {
169:                return transactions > 0;
170:            }
171:
172:        }
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