Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ActionEvent |
|
| 7.2;7,2 |
1 | package org.apache.turbine.modules; | |
2 | ||
3 | /* | |
4 | * Licensed to the Apache Software Foundation (ASF) under one | |
5 | * or more contributor license agreements. See the NOTICE file | |
6 | * distributed with this work for additional information | |
7 | * regarding copyright ownership. The ASF licenses this file | |
8 | * to you under the Apache License, Version 2.0 (the | |
9 | * "License"); you may not use this file except in compliance | |
10 | * with the License. You may obtain a copy of the License at | |
11 | * | |
12 | * http://www.apache.org/licenses/LICENSE-2.0 | |
13 | * | |
14 | * Unless required by applicable law or agreed to in writing, | |
15 | * software distributed under the License is distributed on an | |
16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
17 | * KIND, either express or implied. See the License for the | |
18 | * specific language governing permissions and limitations | |
19 | * under the License. | |
20 | */ | |
21 | ||
22 | import java.lang.annotation.Annotation; | |
23 | ||
24 | ||
25 | import java.lang.reflect.InvocationTargetException; | |
26 | import java.lang.reflect.Method; | |
27 | import java.util.Arrays; | |
28 | ||
29 | import org.apache.commons.collections.map.MultiKeyMap; | |
30 | import org.apache.commons.lang.StringUtils; | |
31 | import org.apache.commons.logging.Log; | |
32 | import org.apache.commons.logging.LogFactory; | |
33 | import org.apache.fulcrum.parser.ParameterParser; | |
34 | import org.apache.fulcrum.parser.ValueParser.URLCaseFolding; | |
35 | import org.apache.turbine.Turbine; | |
36 | import org.apache.turbine.TurbineConstants; | |
37 | import org.apache.turbine.annotation.AnnotationProcessor; | |
38 | import org.apache.turbine.annotation.TurbineActionEvent; | |
39 | import org.apache.turbine.annotation.TurbineConfiguration; | |
40 | import org.apache.turbine.pipeline.PipelineData; | |
41 | ||
42 | /** | |
43 | * <p> | |
44 | * | |
45 | * This is an alternative to the Action class that allows you to do | |
46 | * event based actions. Essentially, you label all your submit buttons | |
47 | * with the prefix of "eventSubmit_" and the suffix of "methodName". | |
48 | * For example, "eventSubmit_doDelete". Then any class that subclasses | |
49 | * this class will get its "doDelete(PipelineData data)" method executed. | |
50 | * If for any reason, it was not able to execute the method, it will | |
51 | * fall back to executing the doPerform() method which is required to | |
52 | * be implemented. | |
53 | * | |
54 | * <p> | |
55 | * | |
56 | * Limitations: | |
57 | * | |
58 | * <p> | |
59 | * | |
60 | * Because ParameterParser makes all the key values lowercase, we have | |
61 | * to do some work to format the string into a method name. For | |
62 | * example, a button name eventSubmit_doDelete gets converted into | |
63 | * eventsubmit_dodelete. Thus, we need to form some sort of naming | |
64 | * convention so that dodelete can be turned into doDelete. | |
65 | * | |
66 | * <p> | |
67 | * | |
68 | * Thus, the convention is this: | |
69 | * | |
70 | * <ul> | |
71 | * <li>The variable name MUST have the prefix "eventSubmit_".</li> | |
72 | * <li>The variable name after the prefix MUST begin with the letters | |
73 | * "do".</li> | |
74 | * <li>The first letter after the "do" will be capitalized and the | |
75 | * rest will be lowercase</li> | |
76 | * </ul> | |
77 | * | |
78 | * If you follow these conventions, then you should be ok with your | |
79 | * method naming in your Action class. | |
80 | * | |
81 | * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens </a> | |
82 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> | |
83 | * @author <a href="quintonm@bellsouth.net">Quinton McCombs</a> | |
84 | * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> | |
85 | * @version $Id: ActionEvent.java 1812628 2017-10-19 12:34:25Z gk $ | |
86 | */ | |
87 | 11 | public abstract class ActionEvent extends Action |
88 | { | |
89 | /** Logging */ | |
90 | 11 | protected Log log = LogFactory.getLog(this.getClass()); |
91 | ||
92 | /** The name of the button to look for. */ | |
93 | protected static final String BUTTON = "eventSubmit_"; | |
94 | /** The length of the button to look for. */ | |
95 | 2 | protected static final int BUTTON_LENGTH = BUTTON.length(); |
96 | /** The default method. */ | |
97 | protected static final String DEFAULT_METHOD = "doPerform"; | |
98 | /** The prefix of the method name. */ | |
99 | protected static final String METHOD_NAME_PREFIX = "do"; | |
100 | /** The length of the method name. */ | |
101 | 2 | protected static final int METHOD_NAME_LENGTH = METHOD_NAME_PREFIX.length(); |
102 | /** The length of the button to look for. */ | |
103 | 2 | protected static final int LENGTH = BUTTON.length(); |
104 | ||
105 | /** | |
106 | * If true, the eventSubmit_do<xxx> variable must contain | |
107 | * a not null value to be executed. | |
108 | */ | |
109 | 11 | @TurbineConfiguration( TurbineConstants.ACTION_EVENTSUBMIT_NEEDSVALUE_KEY ) |
110 | private boolean submitValueKey = TurbineConstants.ACTION_EVENTSUBMIT_NEEDSVALUE_DEFAULT; | |
111 | ||
112 | /** | |
113 | * If true, then exceptions raised in eventSubmit_do<xxx> methods | |
114 | * as well as in doPerform methods are bubbled up to the Turbine | |
115 | * servlet's handleException method. | |
116 | */ | |
117 | 11 | @TurbineConfiguration( TurbineConstants.ACTION_EVENT_BUBBLE_EXCEPTION_UP ) |
118 | protected boolean bubbleUpException = TurbineConstants.ACTION_EVENT_BUBBLE_EXCEPTION_UP_DEFAULT; | |
119 | ||
120 | /** | |
121 | * Cache for the methods to invoke | |
122 | */ | |
123 | 11 | private MultiKeyMap/* <String, Method> */ methodCache = new MultiKeyMap/* <String, Method> */(); |
124 | ||
125 | /** | |
126 | * Retrieve a method of the given name and signature. The value is cached. | |
127 | * | |
128 | * @param name the name of the method | |
129 | * @param signature an array of classes forming the signature of the method | |
130 | * @param pp ParameterParser for correct folding | |
131 | * | |
132 | * @return the method object | |
133 | * @throws NoSuchMethodException if the method does not exist | |
134 | */ | |
135 | protected Method getMethod(String name, Class<?>[] signature, ParameterParser pp) throws NoSuchMethodException | |
136 | { | |
137 | 8 | Method method = (Method) this.methodCache.get(name, signature); |
138 | ||
139 | 8 | if (method == null) |
140 | { | |
141 | // Try annotations of public methods | |
142 | 8 | Method[] methods = getClass().getMethods(); |
143 | ||
144 | methodLoop: | |
145 | 147 | for (Method m : methods) |
146 | { | |
147 | 140 | Annotation[] annotations = AnnotationProcessor.getAnnotations(m); |
148 | 142 | for (Annotation a : annotations) |
149 | { | |
150 | 3 | if (a instanceof TurbineActionEvent) |
151 | { | |
152 | 3 | TurbineActionEvent tae = (TurbineActionEvent) a; |
153 | 3 | if (name.equals(pp.convert(tae.value())) |
154 | && Arrays.equals(signature, m.getParameterTypes())) | |
155 | { | |
156 | 1 | method = m; |
157 | 1 | break methodLoop; |
158 | } | |
159 | } | |
160 | } | |
161 | } | |
162 | ||
163 | // Try legacy mode | |
164 | 8 | if (method == null) |
165 | { | |
166 | 7 | String tmp = name.toLowerCase().substring(METHOD_NAME_LENGTH); |
167 | 7 | method = getClass().getMethod(METHOD_NAME_PREFIX + StringUtils.capitalize(tmp), signature); |
168 | } | |
169 | ||
170 | 8 | this.methodCache.put(name, signature, method); |
171 | } | |
172 | ||
173 | 8 | return method; |
174 | } | |
175 | ||
176 | /** | |
177 | * This overrides the default Action.doPerform() to execute the | |
178 | * doEvent() method. If that fails, then it will execute the | |
179 | * doPerform() method instead. | |
180 | * | |
181 | * @param pipelineData Turbine information. | |
182 | * @throws Exception a generic exception. | |
183 | */ | |
184 | @Override | |
185 | public void doPerform(PipelineData pipelineData) | |
186 | throws Exception | |
187 | { | |
188 | 0 | ParameterParser pp = pipelineData.get(Turbine.class, ParameterParser.class); |
189 | 0 | executeEvents(pp, new Class<?>[]{ PipelineData.class }, new Object[]{ pipelineData }); |
190 | 0 | } |
191 | ||
192 | /** | |
193 | * This method should be called to execute the event based system. | |
194 | * | |
195 | * @param pp the parameter parser | |
196 | * @param signature the signature of the method to call | |
197 | * @param parameters the parameters for the method to call | |
198 | * | |
199 | * @throws Exception a generic exception. | |
200 | */ | |
201 | protected void executeEvents(ParameterParser pp, Class<?>[] signature, Object[] parameters) | |
202 | throws Exception | |
203 | { | |
204 | // Name of the button. | |
205 | 8 | String theButton = null; |
206 | ||
207 | 8 | String button = pp.convert(BUTTON); |
208 | 8 | String key = null; |
209 | ||
210 | // Loop through and find the button. | |
211 | 8 | for (String k : pp) |
212 | { | |
213 | 5 | key = k; |
214 | 5 | if (key.startsWith(button)) |
215 | { | |
216 | 3 | if (considerKey(key, pp)) |
217 | { | |
218 | 3 | theButton = key; |
219 | 3 | break; |
220 | } | |
221 | } | |
222 | 2 | } |
223 | ||
224 | 8 | if (theButton == null) |
225 | { | |
226 | 5 | theButton = BUTTON + DEFAULT_METHOD; |
227 | 5 | key = null; |
228 | } | |
229 | ||
230 | 8 | theButton = formatString(theButton, pp); |
231 | 8 | Method method = null; |
232 | ||
233 | try | |
234 | { | |
235 | 8 | method = getMethod(theButton, signature, pp); |
236 | } | |
237 | 0 | catch (NoSuchMethodException e) |
238 | { | |
239 | 0 | method = getMethod(DEFAULT_METHOD, signature, pp); |
240 | } | |
241 | finally | |
242 | { | |
243 | 8 | if (key != null) |
244 | { | |
245 | 3 | pp.remove(key); |
246 | } | |
247 | } | |
248 | ||
249 | try | |
250 | { | |
251 | 8 | if (log.isDebugEnabled()) |
252 | { | |
253 | 8 | log.debug("Invoking " + method); |
254 | } | |
255 | ||
256 | 8 | method.invoke(this, parameters); |
257 | } | |
258 | 3 | catch (InvocationTargetException ite) |
259 | { | |
260 | 3 | Throwable t = ite.getTargetException(); |
261 | 3 | if (bubbleUpException) |
262 | { | |
263 | 1 | if (t instanceof Exception) |
264 | { | |
265 | 1 | throw (Exception) t; |
266 | } | |
267 | else | |
268 | { | |
269 | 0 | throw ite; |
270 | } | |
271 | } | |
272 | else | |
273 | { | |
274 | 2 | log.error("Invokation of " + method , t); |
275 | } | |
276 | 5 | } |
277 | 7 | } |
278 | ||
279 | /** | |
280 | * This method does the conversion of the lowercase method name | |
281 | * into the proper case. | |
282 | * | |
283 | * @param input The unconverted method name. | |
284 | * @param pp The parameter parser (for correct folding) | |
285 | * @return A string with the method name in the proper case. | |
286 | */ | |
287 | protected String formatString(String input, ParameterParser pp) | |
288 | { | |
289 | 8 | String tmp = input; |
290 | ||
291 | 8 | if (StringUtils.isNotEmpty(input)) |
292 | { | |
293 | 8 | tmp = input.toLowerCase(); |
294 | ||
295 | // Chop off suffixes (for image type) | |
296 | 8 | String methodName = (tmp.endsWith(".x") || tmp.endsWith(".y")) |
297 | ? input.substring(0, input.length() - 2) | |
298 | : input; | |
299 | ||
300 | 8 | if (pp.getUrlFolding() == URLCaseFolding.NONE) |
301 | { | |
302 | 8 | tmp = methodName.substring(BUTTON_LENGTH); |
303 | } | |
304 | else | |
305 | { | |
306 | 0 | tmp = methodName.toLowerCase().substring(BUTTON_LENGTH); |
307 | } | |
308 | } | |
309 | ||
310 | 8 | return tmp; |
311 | } | |
312 | ||
313 | /** | |
314 | * Checks whether the selected key really is a valid event. | |
315 | * | |
316 | * @param key The selected key | |
317 | * @param pp The parameter parser to look for the key value | |
318 | * | |
319 | * @return true if this key is really an ActionEvent Key | |
320 | */ | |
321 | protected boolean considerKey(String key, ParameterParser pp) | |
322 | { | |
323 | 3 | if (!submitValueKey) |
324 | { | |
325 | 3 | log.debug("No Value required, accepting " + key); |
326 | 3 | return true; |
327 | } | |
328 | else | |
329 | { | |
330 | // If the action.eventsubmit.needsvalue key is true, | |
331 | // events with a "0" or empty value are ignored. | |
332 | // This can be used if you have multiple eventSubmit_do<xxx> | |
333 | // fields in your form which are selected by client side code, | |
334 | // e.g. JavaScript. | |
335 | // | |
336 | // If this key is unset or missing, nothing changes for the | |
337 | // current behavior. | |
338 | // | |
339 | 0 | String keyValue = pp.getString(key); |
340 | 0 | log.debug("Key Value is " + keyValue); |
341 | 0 | if (StringUtils.isEmpty(keyValue)) |
342 | { | |
343 | 0 | log.debug("Key is empty, rejecting " + key); |
344 | 0 | return false; |
345 | } | |
346 | ||
347 | try | |
348 | { | |
349 | 0 | if (Integer.parseInt(keyValue) != 0) |
350 | { | |
351 | 0 | log.debug("Integer != 0, accepting " + key); |
352 | 0 | return true; |
353 | } | |
354 | } | |
355 | 0 | catch (NumberFormatException nfe) |
356 | { | |
357 | // Not a number. So it might be a | |
358 | // normal Key like "continue" or "exit". Accept | |
359 | // it. | |
360 | 0 | log.debug("Not a number, accepting " + key); |
361 | 0 | return true; |
362 | 0 | } |
363 | } | |
364 | 0 | log.debug("Rejecting " + key); |
365 | 0 | return false; |
366 | } | |
367 | } |