Source Code Cross Referenced for ActionsProviderSupport.java in  » IDE-Netbeans » ant » org » netbeans » spi » debugger » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » ant » org.netbeans.spi.debugger 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         *
026:         * The Original Software is NetBeans. The Initial Developer of the Original
027:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
028:         * Microsystems, Inc. All Rights Reserved.
029:         *
030:         * If you wish your version of this file to be governed by only the CDDL
031:         * or only the GPL Version 2, indicate your decision by adding
032:         * "[Contributor] elects to include this software in this distribution
033:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
034:         * single choice of license, a recipient has the option to distribute
035:         * your version of this file under either the CDDL, the GPL Version 2 or
036:         * to extend the choice of license to its licensees as provided above.
037:         * However, if you add GPL Version 2 code and therefore, elected the GPL
038:         * Version 2 license, then the option applies only if the new code is
039:         * made subject to such option by the copyright holder.
040:         */
041:
042:        package org.netbeans.spi.debugger;
043:
044:        import java.util.HashSet;
045:        import java.util.Vector;
046:
047:        /**
048:         * Support for {@link ActionsProvider} implementation. You should implement
049:         * {@link #doAction} and {@link #getActions} only, and call {@link #setEnabled}
050:         * when the action state is changed.
051:         *
052:         * @author   Jan Jancura
053:         */
054:        public abstract class ActionsProviderSupport extends ActionsProvider {
055:
056:            private HashSet enabled = new HashSet();
057:            private Vector listeners = new Vector();
058:
059:            /**
060:             * Called when the action is called (action button is pressed).
061:             *
062:             * @param action an action which has been called
063:             */
064:            public abstract void doAction(Object action);
065:
066:            /**
067:             * Returns a state of given action defined by {@link #setEnabled} 
068:             * method call.
069:             *
070:             * Do not override. Should be final - the enabled state is cached,
071:             * therefore this method is not consulted unless the state change
072:             * is fired.
073:             *
074:             * @param action action
075:             */
076:            public boolean isEnabled(Object action) {
077:                return enabled.contains(action);
078:            }
079:
080:            /**
081:             * Sets state of enabled property.
082:             *
083:             * @param action action whose state should be changed
084:             * @param enabled the new state
085:             */
086:            protected final void setEnabled(Object action, boolean enabled) {
087:                boolean fire = false;
088:                if (enabled)
089:                    fire = this .enabled.add(action);
090:                else
091:                    fire = this .enabled.remove(action);
092:                if (fire)
093:                    fireActionStateChanged(action, enabled);
094:            }
095:
096:            /**
097:             * Fires a change of action state.
098:             *
099:             * @param action action whose state has been changed
100:             * @param enabled the new state
101:             */
102:            protected void fireActionStateChanged(Object action, boolean enabled) {
103:                Vector v = (Vector) listeners.clone();
104:                int i, k = v.size();
105:                for (i = 0; i < k; i++)
106:                    ((ActionsProviderListener) v.elementAt(i))
107:                            .actionStateChange(action, enabled);
108:            }
109:
110:            /**
111:             * Adds property change listener.
112:             *
113:             * @param l new listener.
114:             */
115:            public final void addActionsProviderListener(
116:                    ActionsProviderListener l) {
117:                listeners.addElement(l);
118:            }
119:
120:            /**
121:             * Removes property change listener.
122:             *
123:             * @param l removed listener.
124:             */
125:            public final void removeActionsProviderListener(
126:                    ActionsProviderListener l) {
127:                listeners.removeElement(l);
128:            }
129:        }
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