1 /*
2 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
115 * </table>
116 * <p>
117 * Once <code>end</code> has been invoked on an <code>UndoManager</code>
118 * the superclass behavior is used for all <code>UndoableEdit</code>
119 * methods. Refer to <code>CompoundEdit</code> for more details on its
120 * behavior.
121 * <p>
122 * Unlike the rest of Swing, this class is thread safe.
123 * <p>
124 * <strong>Warning:</strong>
125 * Serialized objects of this class will not be compatible with
126 * future Swing releases. The current serialization support is
127 * appropriate for short term storage or RMI between applications running
128 * the same version of Swing. As of 1.4, support for long term storage
129 * of all JavaBeans™
130 * has been added to the <code>java.beans</code> package.
131 * Please see {@link java.beans.XMLEncoder}.
132 *
133 * @author Ray Ryan
134 */
135 public class UndoManager extends CompoundEdit implements UndoableEditListener {
136 int indexOfNextAdd;
137 int limit;
138
139 /**
140 * Creates a new <code>UndoManager</code>.
141 */
142 public UndoManager() {
143 super();
144 indexOfNextAdd = 0;
145 limit = 100;
146 edits.ensureCapacity(limit);
147 }
148
149 /**
150 * Returns the maximum number of edits this {@code UndoManager}
151 * holds. A value less than 0 indicates the number of edits is not
152 * limited.
153 *
154 * @return the maximum number of edits this {@code UndoManager} holds
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1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
115 * </table>
116 * <p>
117 * Once <code>end</code> has been invoked on an <code>UndoManager</code>
118 * the superclass behavior is used for all <code>UndoableEdit</code>
119 * methods. Refer to <code>CompoundEdit</code> for more details on its
120 * behavior.
121 * <p>
122 * Unlike the rest of Swing, this class is thread safe.
123 * <p>
124 * <strong>Warning:</strong>
125 * Serialized objects of this class will not be compatible with
126 * future Swing releases. The current serialization support is
127 * appropriate for short term storage or RMI between applications running
128 * the same version of Swing. As of 1.4, support for long term storage
129 * of all JavaBeans™
130 * has been added to the <code>java.beans</code> package.
131 * Please see {@link java.beans.XMLEncoder}.
132 *
133 * @author Ray Ryan
134 */
135 @SuppressWarnings("serial") // Same-version serialization only
136 public class UndoManager extends CompoundEdit implements UndoableEditListener {
137 int indexOfNextAdd;
138 int limit;
139
140 /**
141 * Creates a new <code>UndoManager</code>.
142 */
143 public UndoManager() {
144 super();
145 indexOfNextAdd = 0;
146 limit = 100;
147 edits.ensureCapacity(limit);
148 }
149
150 /**
151 * Returns the maximum number of edits this {@code UndoManager}
152 * holds. A value less than 0 indicates the number of edits is not
153 * limited.
154 *
155 * @return the maximum number of edits this {@code UndoManager} holds
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