Source Code Cross Referenced for EventHandler.java in  » J2EE » Jaffa » org » jaffa » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Jaffa » org.jaffa.util 
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:        /*
051:         * EventHandler.java
052:         *
053:         * Created on November 21, 2001, 10:50 AM
054:         */
055:
056:        package org.jaffa.util;
057:
058:        import java.util.*;
059:
060:        /** This class determines how an event posted by a browser is to be handled.
061:         */
062:        public class EventHandler {
063:
064:            /**
065:             * This method will generate an array of EventHandler.Method objects.
066:             * Each object will have a Name, the signature & the parameters
067:             * For eg: if eventId="grid1=4;partLookup;clicked"
068:             * The following methods will be generated:
069:             * do_grid1_4_partLookup_clicked
070:             * do_grid1_partLookup_clicked(String v1), v1="4"
071:             * do_grid1_clicked(String v1, String v2), v1="4" & v2="partLookup"
072:             * @param eventId The event.
073:             * @return an array of EventHandler.Method objects.
074:             */
075:            public static EventHandler.Method[] getEventMethods(String eventId) {
076:                List methods = new ArrayList();
077:                if (eventId != null) {
078:                    String fieldName = null;
079:                    List arguments = new ArrayList();
080:                    String eventName = null;
081:
082:                    // Build the arguments list
083:                    StringTokenizer stz = new StringTokenizer(eventId, " =;");
084:                    while (stz.hasMoreTokens())
085:                        arguments.add(stz.nextToken());
086:
087:                    // the 1st element in the argument list is the fieldName
088:                    if (arguments.size() > 0)
089:                        fieldName = (String) arguments.remove(0);
090:
091:                    // the last element in the argument list is the eventName
092:                    if (arguments.size() > 0)
093:                        eventName = (String) arguments
094:                                .remove(arguments.size() - 1);
095:
096:                    if (arguments.size() == 0) {
097:                        Method method = new Method(fieldName);
098:                        if (eventName != null)
099:                            method.appendName(eventName);
100:                        methods.add(method);
101:                    } else {
102:                        for (int i = 0; i <= arguments.size(); i++) {
103:                            Method method = new Method(fieldName);
104:
105:                            // Append arguments to the method-signature
106:                            int j = 0;
107:                            for (; j < i; j++)
108:                                method.appendArgument(String.class,
109:                                        (String) arguments.get(j));
110:
111:                            // Append the remaining arguments to the method-name
112:                            int k = j;
113:                            for (; k < arguments.size(); k++)
114:                                method.appendName((String) arguments.get(k));
115:
116:                            method.appendName(eventName);
117:                            methods.add(method);
118:                        }
119:                    }
120:
121:                }
122:                return (EventHandler.Method[]) methods
123:                        .toArray(new EventHandler.Method[0]);
124:            }
125:
126:            /** This class respresents an EventHandler method. It has the method name,
127:             * the argument types and the argument values.
128:             */
129:            public static class Method {
130:                private StringBuffer m_name = new StringBuffer("do");
131:                private List m_argumentTypes = new ArrayList();
132:                private List m_argumentValues = new ArrayList();
133:
134:                /** Constructor.
135:                 * @param name The name of the event handler method.
136:                 */
137:                public Method(String name) {
138:                    appendName(name);
139:                }
140:
141:                /** Getter for property name.
142:                 * @return Value of property name.
143:                 */
144:                public String getName() {
145:                    return m_name.toString();
146:                }
147:
148:                /** Getter for property argumentTypes.
149:                 * @return Value of property argumentTypes.
150:                 */
151:                public Class[] getArgumentTypes() {
152:                    return (Class[]) m_argumentTypes.toArray(new Class[0]);
153:                }
154:
155:                /** Getter for property argumentValues.
156:                 * @return Value of property argumentValues.
157:                 */
158:                public Object[] getArgumentValues() {
159:                    return m_argumentValues.toArray();
160:                }
161:
162:                /** Returns diagnostic information.
163:                 * @return diagnostic information.
164:                 */
165:                public String toString() {
166:                    StringBuffer buf = new StringBuffer(getName());
167:                    buf.append('(');
168:                    for (int i = 0; i < m_argumentTypes.size(); i++) {
169:                        if (i > 0) {
170:                            buf.append(',');
171:                            buf.append(' ');
172:                        }
173:                        buf.append(((Class) m_argumentTypes.get(i)).getName());
174:                        buf.append('=');
175:                        buf.append(m_argumentValues.get(i));
176:                    }
177:                    buf.append(')');
178:                    return buf.toString();
179:                }
180:
181:                private void appendName(String name) {
182:                    if (name != null) {
183:                        m_name.append('_');
184:                        m_name.append(name);
185:                    }
186:                }
187:
188:                private void appendArgument(Class argumentType,
189:                        Object argumentValue) {
190:                    if (argumentType != null && argumentValue != null) {
191:                        m_argumentTypes.add(argumentType);
192:                        m_argumentValues.add(argumentValue);
193:                    }
194:                }
195:            }
196:
197:            //    /**
198:            //     * @param args the command line arguments
199:            //     */
200:            //    public static void main(String args[]) {
201:            //        try {
202:            //            print(null);
203:            //            print("");
204:            //            print("g1=12;partNo;validate");
205:            //            print("g1=12;partNo;P1;segCode;clicked");
206:            //        } catch (Exception e) {
207:            //            e.printStackTrace();
208:            //        }
209:            //    }
210:            //
211:            //    private static void print(String in) {
212:            //        System.out.println("Input EventId: " + in);
213:            //        EventHandler.Method[] methods = EventHandler.getEventMethods(in);
214:            //        for (int i = 0; i < methods.length; i++)
215:            //            System.out.println(methods[i]);
216:            //        System.out.println();
217:            //
218:            //    }
219:            //
220:
221:        }
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