NavEventFactoryImpl


1   /*
2    * $Header: /cvsroot/jdbforms/dbforms/src/org/dbforms/event/NavEventFactoryImpl.java,v 1.17 2004/08/18 12:25:58 hkollmann Exp $
3    * $Revision: 1.17 $
4    * $Date: 2004/08/18 12:25:58 $
5    *
6    * DbForms - a Rapid Application Development Framework
7    * Copyright (C) 2001 Joachim Peer <joepeer@excite.com>
8    *
9    * This library is free software; you can redistribute it and/or
10   * modify it under the terms of the GNU Lesser General Public
11   * License as published by the Free Software Foundation; either
12   * version 2.1 of the License, or (at your option) any later version.
13   *
14   * This library is distributed in the hope that it will be useful,
15   * but WITHOUT ANY WARRANTY; without even the implied warranty of
16   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17   * Lesser General Public License for more details.
18   *
19   * You should have received a copy of the GNU Lesser General Public
20   * License along with this library; if not, write to the Free Software
21   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
22   */
23  
24  package org.dbforms.event;
25  
26  import org.apache.commons.logging.Log;
27  import org.apache.commons.logging.LogFactory;
28  
29  import org.dbforms.config.DbFormsConfig;
30  import org.dbforms.config.EventInfo;
31  import org.dbforms.config.Table;
32  
33  import org.dbforms.event.eventtype.EventType;
34  
35  import javax.servlet.http.HttpServletRequest  ;
36  
37  
38  
39  /**
40   * Implementation of a Navigation Event Factory.
41   *
42   * @author Luca Fossato
43   *
44   */
45  public class NavEventFactoryImpl extends NavEventFactory {
46     /** an handle to the unique NavigationEventFactory instance */
47     private static NavEventFactory instance = null;
48     private static Log             logCat = LogFactory.getLog(NavEventFactoryImpl.class);
49  
50     /**
51      * Default constructor.
52      */
53     public NavEventFactoryImpl() {
54     }
55  
56     /**
57      * Get the instance of the NavEventFactoryImpl class.
58      *
59      * @return the instance of NavEventFactoryImpl class.
60      */
61     public static synchronized NavEventFactory instance() {
62        if (instance == null) {
63           instance = new NavEventFactoryImpl();
64        }
65  
66        return instance;
67     }
68  
69  
70     /**
71      * create and return a new navigation event
72      *
73      * @param action the action string that identifies the web event
74      * @param request the HttpServletRequest object
75      * @param config the DbForms config object
76      *
77      * @return a new navigation event
78      */
79     public WebEvent createEvent(String               action,
80                                 HttpServletRequest   request,
81                                 DbFormsConfig      config) {
82        Object  [] constructorArgs = new Object  [] {
83                                      action,
84                                      request,
85                                      config
86                                   };
87        String     eventId = getEventIdFromDestinationTable(request, action);
88        EventInfo einfo  = getEventInfo(eventId);
89  
90        // debug
91        logCat.info("::createEvent - got event [" + einfo + "] from action ["
92                    + action + "]");
93  
94        return getEvent(einfo, constructorArgsTypes, constructorArgs);
95     }
96  
97  
98     /**
99      * create and return a new navigation event. Called from local web event in
100     * DbForms!
101     *
102     * @param action the action string that identifies the web event
103     * @param request DOCUMENT ME!
104     * @param config the DbForms config object
105     * @param table the Table object
106     *
107     * @return a new navigation event
108     */
109    public NavigationEvent createEvent(String               action,
110                                       HttpServletRequest   request,
111                                       DbFormsConfig      config,
112                                       Table              table) {
113       Object  [] constructorArgs = new Object  [] {
114                                     table,
115                                     request,
116                                     config
117                                  };
118       String     eventId = getEventIdFromDestinationTable(table, action);
119       EventInfo einfo  = getEventInfo(eventId);
120 
121       // debug
122       logCat.info("::createEvent - got event [" + einfo + "] from action ["
123                   + action + "]");
124 
125       return (NavigationEvent) getEvent(einfo, actionConstructorArgsTypes,
126                                         constructorArgs);
127    }
128 
129 
130    /**
131     * Create and return a new navGoto event. Used by the view (DbFormTag) to
132     * create a gotoEvent
133     *
134     * @param table the Table object
135     * @param request DOCUMENT ME!
136     * @param config DOCUMENT ME!
137     * @param positionString the position string object
138     *
139     * @return a new navGoto event
140     */
141    public NavigationEvent createGotoEvent(Table              table,
142                                           HttpServletRequest   request,
143                                           DbFormsConfig      config,
144                                           String               positionString) {
145       String      eventId = table.getTableEvents()
146                                .getEventId(EventType.EVENT_NAVIGATION_GOTO);
147       EventInfo einfo           = getEventInfo(eventId);
148       Object  []  constructorArgs = new Object  [] {
149                                      table,
150                                      request,
151                                      config,
152                                      positionString
153                                   };
154 
155       return (NavigationEvent) getEvent(einfo, goToConstructorArgsTypes,
156                                         constructorArgs);
157    }
158 
159 
160    /**
161     * Create and return a new navGoto event. Used by the view (DbFormTag) to
162     * create a gotoEvent for free form select
163     *
164     * @param table the Table object
165     * @param request the position string object
166     * @param config DOCUMENT ME!
167     * @param whereClause DOCUMENT ME!
168     * @param tableList DOCUMENT ME!
169     *
170     * @return a new navGoto event
171     */
172    public NavigationEvent createGotoEvent(Table              table,
173                                           HttpServletRequest   request,
174                                           DbFormsConfig      config,
175                                           String               whereClause,
176                                           String               tableList) {
177       String      eventId = table.getTableEvents()
178                                .getEventId(EventType.EVENT_NAVIGATION_GOTO);
179       EventInfo einfo           = getEventInfo(eventId);
180       Object  []  constructorArgs = new Object  [] {
181                                      table,
182                                      request,
183                                      config,
184                                      whereClause,
185                                      tableList
186                                   };
187 
188       return (NavigationEvent) getEvent(einfo, goToConstructorArgsTypes2,
189                                         constructorArgs);
190    }
191 
192 
193    /**
194     * Initialize the default events.
195     *
196     * @exception Exception if any error occurs
197     */
198    protected void initializeEvents() throws Exception   {
199       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_NEW,
200                                  "org.dbforms.event.NavNewEvent"));
201       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_COPY,
202                                  "org.dbforms.event.NavCopyEvent"));
203       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_GOTO,
204                                  "org.dbforms.event.datalist.GotoEvent"));
205       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_FIRST,
206                                  "org.dbforms.event.datalist.NavFirstEvent"));
207       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_LAST,
208                                  "org.dbforms.event.datalist.NavLastEvent"));
209       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_NEXT,
210                                  "org.dbforms.event.datalist.NavNextEvent"));
211       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_PREV,
212                                  "org.dbforms.event.datalist.NavPrevEvent"));
213 
214       addEventInfo(new EventInfo(EventType.EVENT_NAVIGATION_RELOAD,
215                                  "org.dbforms.event.datalist.ReloadEvent"));
216    }
217 }
218
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