Source Code Cross Referenced for DeleteComponent.java in  » J2EE » Jaffa » org » jaffa » components » maint » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.components.maint 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ====================================================================
003:         * JAFFA - Java Application Framework For All
004:         *
005:         * Copyright (C) 2002 JAFFA Development Group
006:         *
007:         *     This library is free software; you can redistribute it and/or
008:         *     modify it under the terms of the GNU Lesser General Public
009:         *     License as published by the Free Software Foundation; either
010:         *     version 2.1 of the License, or (at your option) any later version.
011:         *
012:         *     This library 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 GNU
015:         *     Lesser General Public License for more details.
016:         *
017:         *     You should have received a copy of the GNU Lesser General Public
018:         *     License along with this library; if not, write to the Free Software
019:         *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020:         *
021:         * Redistribution and use of this software and associated documentation ("Software"),
022:         * with or without modification, are permitted provided that the following conditions are met:
023:         * 1.	Redistributions of source code must retain copyright statements and notices.
024:         *         Redistributions must also contain a copy of this document.
025:         * 2.	Redistributions in binary form must reproduce the above copyright notice,
026:         * 	this list of conditions and the following disclaimer in the documentation
027:         * 	and/or other materials provided with the distribution.
028:         * 3.	The name "JAFFA" must not be used to endorse or promote products derived from
029:         * 	this Software without prior written permission. For written permission,
030:         * 	please contact mail to: jaffagroup@yahoo.com.
031:         * 4.	Products derived from this Software may not be called "JAFFA" nor may "JAFFA"
032:         * 	appear in their names without prior written permission.
033:         * 5.	Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net).
034:         *
035:         * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
036:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046:         * SUCH DAMAGE.
047:         * ====================================================================
048:         */
049:
050:        package org.jaffa.components.maint;
051:
052:        import org.jaffa.presentation.portlet.component.Component;
053:        import java.util.Collection;
054:        import java.util.HashSet;
055:        import java.util.Iterator;
056:        import java.util.EventObject;
057:
058:        /** This is an abstract implementation of the IDeleteComponent interface.
059:         * All the Delete components should extend this component.
060:         *
061:         * @author  GautamJ
062:         */
063:        public abstract class DeleteComponent extends Component implements 
064:                IDeleteComponent {
065:
066:            private Collection m_deleteListeners;
067:
068:            /** Adds a listener.
069:             * @param listener the listener.
070:             */
071:            public void addDeleteListener(IDeleteListener listener) {
072:                if (m_deleteListeners == null)
073:                    m_deleteListeners = new HashSet();
074:                m_deleteListeners.add(listener);
075:            }
076:
077:            /** Removes a listener.
078:             * @param listener the listener.
079:             * @return true if the listener was removed.
080:             */
081:            public boolean removeDeleteListener(IDeleteListener listener) {
082:                if (m_deleteListeners != null)
083:                    return m_deleteListeners.remove(listener);
084:                else
085:                    return false;
086:            }
087:
088:            /** This clears the internal collection of listeners.
089:             * It then invokes the quit() method of the base class.
090:             */
091:            public void quit() {
092:                if (m_deleteListeners != null) {
093:                    m_deleteListeners.clear();
094:                    m_deleteListeners = null;
095:                }
096:                super .quit();
097:            }
098:
099:            /** Returns a Collection of IDeleteListener objects.
100:             * @return a Collection of IDeleteListener objects.
101:             */
102:            protected Collection getDeleteListeners() {
103:                return m_deleteListeners;
104:            }
105:
106:            /** Invokes the deleteDone() method of the registered IDeleteListener objects in the same thread.
107:             */
108:            protected void invokeDeleteListeners() {
109:                invokeDeleteListeners(null);
110:            }
111:
112:            /** Invokes the deleteDone() method of the registered IDeleteListener objects in the same thread.
113:             * @param eventObject The EventObject which will probably contain the component itself.
114:             */
115:            protected void invokeDeleteListeners(EventObject eventObject) {
116:                if (m_deleteListeners != null) {
117:                    if (eventObject == null)
118:                        eventObject = new EventObject(this );
119:
120:                    for (Iterator i = m_deleteListeners.iterator(); i.hasNext();)
121:                        ((IDeleteListener) i.next()).deleteDone(eventObject);
122:                }
123:            }
124:
125:        }
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