Source Code Cross Referenced for StrutsUtil.java in  » Content-Management-System » TransferCM » com » methodhead » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » TransferCM » com.methodhead.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * Copyright (C) 2006 Methodhead Software LLC.  All rights reserved.
003:         * 
004:         * This file is part of TransferCM.
005:         * 
006:         * TransferCM is free software; you can redistribute it and/or modify it under the
007:         * terms of the GNU General Public License as published by the Free Software
008:         * Foundation; either version 2 of the License, or (at your option) any later
009:         * version.
010:         * 
011:         * TransferCM is distributed in the hope that it will be useful, but WITHOUT ANY
012:         * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
013:         * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
014:         * details.
015:         * 
016:         * You should have received a copy of the GNU General Public License along with
017:         * TransferCM; if not, write to the Free Software Foundation, Inc., 51 Franklin St,
018:         * Fifth Floor, Boston, MA  02110-1301  USA
019:         */
020:
021:        package com.methodhead.util;
022:
023:        import javax.servlet.http.HttpServletRequest;
024:
025:        import org.apache.log4j.Logger;
026:
027:        import org.apache.struts.Globals;
028:        import org.apache.struts.action.ActionMessage;
029:        import org.apache.struts.action.ActionMessages;
030:        import org.apache.struts.action.ActionError;
031:        import org.apache.struts.action.ActionErrors;
032:        import org.apache.struts.action.ActionMapping;
033:        import org.apache.struts.action.ActionForward;
034:
035:        import org.apache.struts.util.MessageResources;
036:        import com.methodhead.MhfException;
037:
038:        /**
039:         * A collection of convenience methods for use with the Struts framework.
040:         */
041:        public class StrutsUtil {
042:
043:            // constructors /////////////////////////////////////////////////////////////
044:
045:            // constants ////////////////////////////////////////////////////////////////
046:
047:            // classes //////////////////////////////////////////////////////////////////
048:
049:            // methods //////////////////////////////////////////////////////////////////
050:
051:            /** 
052:             * Adds the <tt>msgKey</tt> message to the action messages in
053:             * <tt>request</tt> for <tt>property</tt>, creating an
054:             * <tt>ActionMessages</tt> object if necessary.  <tt>arg0</tt>,
055:             * <tt>arg1</tt>, and <tt>arg2</tt> may be null; the appropriate
056:             * <tt>ActionMessage</tt> constructor will be used.  If the message is not
057:             * defined, a warning is logged.  If <tt>property</tt> is <tt>null</tt>,
058:             * <tt>ActionErrors.GLOBAL_MESSAGE</tt> is assumed.
059:             */
060:            public static void addMessage(HttpServletRequest request,
061:                    String property, String msgKey, Object arg0, Object arg1,
062:                    Object arg2) {
063:
064:                //
065:                // force the property if it hasn't been supplied
066:                //
067:                if (property == null) {
068:                    property = ActionMessages.GLOBAL_MESSAGE;
069:                }
070:
071:                //
072:                // get the action messages
073:                //
074:                ActionMessages messages = (ActionMessages) request
075:                        .getAttribute(Globals.MESSAGE_KEY);
076:
077:                if (messages == null) {
078:                    messages = new ActionMessages();
079:                    request.setAttribute(Globals.MESSAGE_KEY, messages);
080:                }
081:
082:                //
083:                // get the particular message
084:                //
085:                MessageResources messageResources = (MessageResources) request
086:                        .getAttribute(Globals.MESSAGES_KEY);
087:
088:                if (messageResources == null)
089:                    throw new MhfException("Message resources is null.");
090:
091:                String message = messageResources.getMessage(msgKey);
092:
093:                if (message == null)
094:                    logger_.warn(msgKey + " resource message is not defined.");
095:
096:                //
097:                // instantiate the appropriate message
098:                //
099:                ActionMessage actionMessage = null;
100:                if (arg0 == null)
101:                    actionMessage = new ActionMessage(msgKey);
102:                else if (arg1 == null)
103:                    actionMessage = new ActionMessage(msgKey, arg0);
104:                else if (arg2 == null)
105:                    actionMessage = new ActionMessage(msgKey, arg0, arg1);
106:                else
107:                    actionMessage = new ActionMessage(msgKey, arg0, arg1, arg2);
108:
109:                //
110:                // add the message
111:                //
112:                messages.add(property, actionMessage);
113:            }
114:
115:            /** 
116:             * Adds the <tt>msgKey</tt> message to the action errors in
117:             * <tt>request</tt> for <tt>property</tt>, creating an
118:             * <tt>ActionErrors</tt> object if necessary.  <tt>arg0</tt>,
119:             * <tt>arg1</tt>, and <tt>arg2</tt> may be null; the appropriate
120:             * <tt>ActionMessage</tt> constructor will be used.  If the message is not
121:             * defined, a warning is logged.  If <tt>property</tt> is <tt>null</tt>,
122:             * <tt>ActionErrors.GLOBAL_ERROR</tt> is assumed.
123:             */
124:            public static void addError(HttpServletRequest request,
125:                    String property, String msgKey, Object arg0, Object arg1,
126:                    Object arg2) {
127:
128:                //
129:                // force the property if it hasn't been supplied
130:                //
131:                if (property == null) {
132:                    property = ActionErrors.GLOBAL_ERROR;
133:                }
134:
135:                //
136:                // get the action messages
137:                //
138:                ActionErrors messages = (ActionErrors) request
139:                        .getAttribute(Globals.ERROR_KEY);
140:
141:                if (messages == null) {
142:                    messages = new ActionErrors();
143:                    request.setAttribute(Globals.ERROR_KEY, messages);
144:                }
145:
146:                //
147:                // get the particular message
148:                //
149:                MessageResources messageResources = (MessageResources) request
150:                        .getAttribute(Globals.MESSAGES_KEY);
151:
152:                String message = messageResources.getMessage(msgKey);
153:
154:                if (message == null)
155:                    logger_.warn(msgKey + " resource message is not defined.");
156:
157:                //
158:                // instantiate the appropriate message
159:                //
160:                ActionError actionMessage = null;
161:                if (arg0 == null)
162:                    actionMessage = new ActionError(msgKey);
163:                else if (arg1 == null)
164:                    actionMessage = new ActionError(msgKey, arg0);
165:                else if (arg2 == null)
166:                    actionMessage = new ActionError(msgKey, arg0, arg1);
167:                else
168:                    actionMessage = new ActionError(msgKey, arg0, arg1, arg2);
169:
170:                //
171:                // add the message
172:                //
173:                messages.add(property, actionMessage);
174:            }
175:
176:            /** 
177:             * Adds a message as in {@link
178:             * #addMessage(javax.servlet.http.HttpServletRequest,java.lang.String,java.lang.String,java.lang.Object,java.lang.Object,java.lang.Object) addMessage()}, assuming the <tt>GLOBAL_MESSAGE</tt> property.
179:             */
180:            public static void addMessage(HttpServletRequest request,
181:                    String msgKey, Object arg0, Object arg1, Object arg2) {
182:
183:                addMessage(request, ActionMessages.GLOBAL_MESSAGE, msgKey,
184:                        arg0, arg1, arg2);
185:            }
186:
187:            /**
188:             * Adds a message to the request's action messages, creating a new
189:             * <tt>ActionMessages</tt> object if necessary.  An warning is logged if no
190:             * message exists for <tt>msgKey</tt>.
191:             * @deprecated Use {@link #addMessage(javax.servlet.http.HttpServletRequest,java.lang.String,java.lang.String,java.lang.Object,java.lang.Object,java.lang.Object) addMessage()}
192:             */
193:            public static void addMessage(HttpServletRequest request,
194:                    MessageResources messageResources, String property,
195:                    String msgKey, Object arg0) {
196:
197:                ActionMessages messages = (ActionMessages) request
198:                        .getAttribute(Globals.MESSAGE_KEY);
199:
200:                if (messages == null)
201:                    messages = new ActionMessages();
202:
203:                String message = messageResources.getMessage(msgKey);
204:                if (message == null)
205:                    logger_.warn(msgKey + " resource message is not defined.");
206:
207:                messages.add(property, new ActionMessage(msgKey, arg0));
208:
209:                request.setAttribute(Globals.MESSAGE_KEY, messages);
210:            }
211:
212:            /**
213:             * Adds a message to the request's action messages, creating a new
214:             * <tt>ActionMessages</tt> object if necessary.  An warning is logged if no
215:             * message exists for <tt>msgKey</tt>.
216:             * @deprecated Use {@link #addMessage(javax.servlet.http.HttpServletRequest,java.lang.String,java.lang.String,java.lang.Object,java.lang.Object,java.lang.Object) addMessage()}
217:             */
218:            public static void addMessage(HttpServletRequest request,
219:                    MessageResources messageResources, String property,
220:                    String msgKey, Object arg0, Object arg1) {
221:
222:                ActionMessages messages = (ActionMessages) request
223:                        .getAttribute(Globals.MESSAGE_KEY);
224:
225:                if (messages == null)
226:                    messages = new ActionMessages();
227:
228:                String message = messageResources.getMessage(msgKey);
229:                if (message == null)
230:                    logger_.warn(msgKey + " resource message is not defined.");
231:
232:                messages.add(property, new ActionMessage(msgKey, arg0, arg1));
233:
234:                request.setAttribute(Globals.MESSAGE_KEY, messages);
235:            }
236:
237:            /**
238:             * Adds a message to the request's action messages, creating a new
239:             * <tt>ActionMessages</tt> object if necessary.  An warning is logged if no
240:             * message exists for <tt>msgKey</tt>.
241:             * @deprecated Use {@link #addMessage(javax.servlet.http.HttpServletRequest,java.lang.String,java.lang.String,java.lang.Object,java.lang.Object,java.lang.Object) addMessage()}
242:             */
243:            public static void addMessage(HttpServletRequest request,
244:                    MessageResources messageResources, String property,
245:                    String msgKey, Object arg0, Object arg1, Object arg2) {
246:
247:                ActionMessages messages = (ActionMessages) request
248:                        .getAttribute(Globals.MESSAGE_KEY);
249:
250:                if (messages == null)
251:                    messages = new ActionMessages();
252:
253:                String message = messageResources.getMessage(msgKey);
254:                if (message == null)
255:                    logger_.warn(msgKey + " resource message is not defined.");
256:
257:                messages.add(property, new ActionMessage(msgKey, arg0, arg1,
258:                        arg2));
259:
260:                request.setAttribute(Globals.MESSAGE_KEY, messages);
261:            }
262:
263:            /**
264:             * Returns the forward named <tt>name</tt> or throws an exception
265:             * with a message indicating the forward could not be found.
266:             */
267:            public static ActionForward findForward(ActionMapping mapping,
268:                    String name) {
269:
270:                ActionForward forward = mapping.findForward(name);
271:
272:                if (forward == null)
273:                    throw new MhfException("Couldn't find \"" + name
274:                            + "\" forward");
275:
276:                return forward;
277:            }
278:
279:            /**
280:             * NOT UNIT TESTED Instantiates the policy specified by <tt>mapping</tt>'s
281:             * parameter.
282:             */
283:            public static Object getPolicy(ActionMapping mapping) {
284:
285:                try {
286:                    return Class.forName(mapping.getParameter()).newInstance();
287:                } catch (Exception e) {
288:                    throw new MhfException(
289:                            "Unexpected exception while instantiating \""
290:                                    + mapping.getParameter() + "\":"
291:                                    + e.toString());
292:                }
293:            }
294:
295:            // properties ///////////////////////////////////////////////////////////////
296:
297:            // attributes ///////////////////////////////////////////////////////////////
298:
299:            private static Logger logger_ = Logger.getLogger("StrutsUtil");
300:        }
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