| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| ActionEvent |
|
| 6.5;6,5 |
| 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.reflect.InvocationTargetException; | |
| 23 | import java.lang.reflect.Method; | |
| 24 | import java.util.Arrays; | |
| 25 | ||
| 26 | import org.apache.commons.collections.map.MultiKeyMap; | |
| 27 | import org.apache.commons.lang.StringUtils; | |
| 28 | import org.apache.commons.logging.Log; | |
| 29 | import org.apache.commons.logging.LogFactory; | |
| 30 | import org.apache.fulcrum.parser.ParameterParser; | |
| 31 | import org.apache.fulcrum.parser.ValueParser.URLCaseFolding; | |
| 32 | import org.apache.turbine.Turbine; | |
| 33 | import org.apache.turbine.TurbineConstants; | |
| 34 | import org.apache.turbine.annotation.TurbineActionEvent; | |
| 35 | import org.apache.turbine.pipeline.PipelineData; | |
| 36 | ||
| 37 | /** | |
| 38 | * <p> | |
| 39 | * | |
| 40 | * This is an alternative to the Action class that allows you to do | |
| 41 | * event based actions. Essentially, you label all your submit buttons | |
| 42 | * with the prefix of "eventSubmit_" and the suffix of "methodName". | |
| 43 | * For example, "eventSubmit_doDelete". Then any class that subclasses | |
| 44 | * this class will get its "doDelete(PipelineData data)" method executed. | |
| 45 | * If for any reason, it was not able to execute the method, it will | |
| 46 | * fall back to executing the doPerform() method which is required to | |
| 47 | * be implemented. | |
| 48 | * | |
| 49 | * <p> | |
| 50 | * | |
| 51 | * Limitations: | |
| 52 | * | |
| 53 | * <p> | |
| 54 | * | |
| 55 | * Because ParameterParser makes all the key values lowercase, we have | |
| 56 | * to do some work to format the string into a method name. For | |
| 57 | * example, a button name eventSubmit_doDelete gets converted into | |
| 58 | * eventsubmit_dodelete. Thus, we need to form some sort of naming | |
| 59 | * convention so that dodelete can be turned into doDelete. | |
| 60 | * | |
| 61 | * <p> | |
| 62 | * | |
| 63 | * Thus, the convention is this: | |
| 64 | * | |
| 65 | * <ul> | |
| 66 | * <li>The variable name MUST have the prefix "eventSubmit_".</li> | |
| 67 | * <li>The variable name after the prefix MUST begin with the letters | |
| 68 | * "do".</li> | |
| 69 | * <li>The first letter after the "do" will be capitalized and the | |
| 70 | * rest will be lowercase</li> | |
| 71 | * </ul> | |
| 72 | * | |
| 73 | * If you follow these conventions, then you should be ok with your | |
| 74 | * method naming in your Action class. | |
| 75 | * | |
| 76 | * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens </a> | |
| 77 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> | |
| 78 | * @author <a href="quintonm@bellsouth.net">Quinton McCombs</a> | |
| 79 | * @author <a href="mailto:peter@courcoux.biz">Peter Courcoux</a> | |
| 80 | * @version $Id: ActionEvent.java 1706425 2015-10-02 14:47:51Z tv $ | |
| 81 | */ | |
| 82 | public abstract class ActionEvent extends Action | |
| 83 | { | |
| 84 | /** Logging */ | |
| 85 | 11 | protected Log log = LogFactory.getLog(this.getClass()); |
| 86 | ||
| 87 | /** The name of the button to look for. */ | |
| 88 | protected static final String BUTTON = "eventSubmit_"; | |
| 89 | /** The length of the button to look for. */ | |
| 90 | 2 | protected static final int BUTTON_LENGTH = BUTTON.length(); |
| 91 | /** The default method. */ | |
| 92 | protected static final String DEFAULT_METHOD = "doPerform"; | |
| 93 | /** The prefix of the method name. */ | |
| 94 | protected static final String METHOD_NAME_PREFIX = "do"; | |
| 95 | /** The length of the method name. */ | |
| 96 | 2 | protected static final int METHOD_NAME_LENGTH = METHOD_NAME_PREFIX.length(); |
| 97 | /** The length of the button to look for. */ | |
| 98 | 2 | protected static final int LENGTH = BUTTON.length(); |
| 99 | ||
| 100 | /** | |
| 101 | * If true, the eventSubmit_do<xxx> variable must contain | |
| 102 | * a not null value to be executed. | |
| 103 | */ | |
| 104 | 11 | private boolean submitValueKey = false; |
| 105 | ||
| 106 | /** | |
| 107 | * If true, then exceptions raised in eventSubmit_do<xxx> methods | |
| 108 | * as well as in doPerform methods are bubbled up to the Turbine | |
| 109 | * servlet's handleException method. | |
| 110 | */ | |
| 111 | 11 | protected boolean bubbleUpException = true; |
| 112 | ||
| 113 | /** | |
| 114 | * Cache for the methods to invoke | |
| 115 | */ | |
| 116 | 11 | private MultiKeyMap/* <String, Method> */ methodCache = new MultiKeyMap/* <String, Method> */(); |
| 117 | ||
| 118 | /** | |
| 119 | * C'tor | |
| 120 | */ | |
| 121 | public ActionEvent() | |
| 122 | { | |
| 123 | 11 | super(); |
| 124 | ||
| 125 | 11 | submitValueKey = Turbine.getConfiguration() |
| 126 | .getBoolean(TurbineConstants.ACTION_EVENTSUBMIT_NEEDSVALUE_KEY, | |
| 127 | TurbineConstants.ACTION_EVENTSUBMIT_NEEDSVALUE_DEFAULT); | |
| 128 | 11 | bubbleUpException = Turbine.getConfiguration() |
| 129 | .getBoolean(TurbineConstants.ACTION_EVENT_BUBBLE_EXCEPTION_UP, | |
| 130 | TurbineConstants.ACTION_EVENT_BUBBLE_EXCEPTION_UP_DEFAULT); | |
| 131 | ||
| 132 | 11 | if (log.isDebugEnabled()) |
| 133 | { | |
| 134 | 11 | log.debug(submitValueKey |
| 135 | ? "ActionEvent accepts only eventSubmit_do Keys with a value != 0" | |
| 136 | : "ActionEvent accepts all eventSubmit_do Keys"); | |
| 137 | 11 | log.debug(bubbleUpException |
| 138 | ? "ActionEvent will bubble exceptions up to Turbine.handleException() method" | |
| 139 | : "ActionEvent will not bubble exceptions up."); | |
| 140 | } | |
| 141 | 11 | } |
| 142 | ||
| 143 | /** | |
| 144 | * Retrieve a method of the given name and signature. The value is cached. | |
| 145 | * | |
| 146 | * @param name the name of the method | |
| 147 | * @param signature an array of classes forming the signature of the method | |
| 148 | * @param pp ParameterParser for correct folding | |
| 149 | * | |
| 150 | * @return the method object | |
| 151 | * @throws NoSuchMethodException if the method does not exist | |
| 152 | */ | |
| 153 | protected Method getMethod(String name, Class<?>[] signature, ParameterParser pp) throws NoSuchMethodException | |
| 154 | { | |
| 155 | 8 | Method method = (Method) this.methodCache.get(name, signature); |
| 156 | ||
| 157 | 8 | if (method == null) |
| 158 | { | |
| 159 | // Try annotations of public methods | |
| 160 | 8 | Method[] methods = getClass().getMethods(); |
| 161 | 119 | for (Method m : methods) |
| 162 | { | |
| 163 | 112 | if (m.isAnnotationPresent(TurbineActionEvent.class)) |
| 164 | { | |
| 165 | 3 | TurbineActionEvent tae = m.getAnnotation(TurbineActionEvent.class); |
| 166 | 3 | if (name.equals(pp.convert(tae.value())) |
| 167 | && Arrays.equals(signature, m.getParameterTypes())) | |
| 168 | { | |
| 169 | 1 | method = m; |
| 170 | 1 | break; |
| 171 | } | |
| 172 | } | |
| 173 | } | |
| 174 | ||
| 175 | // Try legacy mode | |
| 176 | 8 | if (method == null) |
| 177 | { | |
| 178 | 7 | String tmp = name.toLowerCase().substring(METHOD_NAME_LENGTH); |
| 179 | 7 | method = getClass().getMethod(METHOD_NAME_PREFIX + StringUtils.capitalize(tmp), signature); |
| 180 | } | |
| 181 | ||
| 182 | 8 | this.methodCache.put(name, signature, method); |
| 183 | } | |
| 184 | ||
| 185 | 8 | return method; |
| 186 | } | |
| 187 | ||
| 188 | /** | |
| 189 | * This overrides the default Action.doPerform() to execute the | |
| 190 | * doEvent() method. If that fails, then it will execute the | |
| 191 | * doPerform() method instead. | |
| 192 | * | |
| 193 | * @param pipelineData Turbine information. | |
| 194 | * @exception Exception a generic exception. | |
| 195 | */ | |
| 196 | @Override | |
| 197 | public void doPerform(PipelineData pipelineData) | |
| 198 | throws Exception | |
| 199 | { | |
| 200 | 0 | ParameterParser pp = pipelineData.get(Turbine.class, ParameterParser.class); |
| 201 | 0 | executeEvents(pp, new Class<?>[]{ PipelineData.class }, new Object[]{ pipelineData }); |
| 202 | 0 | } |
| 203 | ||
| 204 | /** | |
| 205 | * This method should be called to execute the event based system. | |
| 206 | * | |
| 207 | * @param pp the parameter parser | |
| 208 | * @param signature the signature of the method to call | |
| 209 | * @param parameters the parameters for the method to call | |
| 210 | * | |
| 211 | * @exception Exception a generic exception. | |
| 212 | */ | |
| 213 | protected void executeEvents(ParameterParser pp, Class<?>[] signature, Object[] parameters) | |
| 214 | throws Exception | |
| 215 | { | |
| 216 | // Name of the button. | |
| 217 | 8 | String theButton = null; |
| 218 | ||
| 219 | 8 | String button = pp.convert(BUTTON); |
| 220 | 8 | String key = null; |
| 221 | ||
| 222 | // Loop through and find the button. | |
| 223 | 8 | for (String k : pp) |
| 224 | { | |
| 225 | 5 | key = k; |
| 226 | 5 | if (key.startsWith(button)) |
| 227 | { | |
| 228 | 3 | if (considerKey(key, pp)) |
| 229 | { | |
| 230 | 3 | theButton = key; |
| 231 | 3 | break; |
| 232 | } | |
| 233 | } | |
| 234 | 2 | } |
| 235 | ||
| 236 | 8 | if (theButton == null) |
| 237 | { | |
| 238 | 5 | theButton = BUTTON + DEFAULT_METHOD; |
| 239 | 5 | key = null; |
| 240 | } | |
| 241 | ||
| 242 | 8 | theButton = formatString(theButton, pp); |
| 243 | 8 | Method method = null; |
| 244 | ||
| 245 | try | |
| 246 | { | |
| 247 | 8 | method = getMethod(theButton, signature, pp); |
| 248 | } | |
| 249 | 0 | catch (NoSuchMethodException e) |
| 250 | { | |
| 251 | 0 | method = getMethod(DEFAULT_METHOD, signature, pp); |
| 252 | } | |
| 253 | finally | |
| 254 | { | |
| 255 | 8 | if (key != null) |
| 256 | { | |
| 257 | 3 | pp.remove(key); |
| 258 | } | |
| 259 | } | |
| 260 | ||
| 261 | try | |
| 262 | { | |
| 263 | 8 | if (log.isDebugEnabled()) |
| 264 | { | |
| 265 | 8 | log.debug("Invoking " + method); |
| 266 | } | |
| 267 | ||
| 268 | 8 | method.invoke(this, parameters); |
| 269 | } | |
| 270 | 3 | catch (InvocationTargetException ite) |
| 271 | { | |
| 272 | 3 | Throwable t = ite.getTargetException(); |
| 273 | 3 | if (bubbleUpException) |
| 274 | { | |
| 275 | 1 | if (t instanceof Exception) |
| 276 | { | |
| 277 | 1 | throw (Exception) t; |
| 278 | } | |
| 279 | else | |
| 280 | { | |
| 281 | 0 | throw ite; |
| 282 | } | |
| 283 | } | |
| 284 | else | |
| 285 | { | |
| 286 | 2 | log.error("Invokation of " + method , t); |
| 287 | } | |
| 288 | 5 | } |
| 289 | 7 | } |
| 290 | ||
| 291 | /** | |
| 292 | * This method does the conversion of the lowercase method name | |
| 293 | * into the proper case. | |
| 294 | * | |
| 295 | * @param input The unconverted method name. | |
| 296 | * @param pp The parameter parser (for correct folding) | |
| 297 | * @return A string with the method name in the proper case. | |
| 298 | */ | |
| 299 | protected String formatString(String input, ParameterParser pp) | |
| 300 | { | |
| 301 | 8 | String tmp = input; |
| 302 | ||
| 303 | 8 | if (StringUtils.isNotEmpty(input)) |
| 304 | { | |
| 305 | 8 | tmp = input.toLowerCase(); |
| 306 | ||
| 307 | // Chop off suffixes (for image type) | |
| 308 | 8 | String methodName = (tmp.endsWith(".x") || tmp.endsWith(".y")) |
| 309 | ? input.substring(0, input.length() - 2) | |
| 310 | : input; | |
| 311 | ||
| 312 | 8 | if (pp.getUrlFolding() == URLCaseFolding.NONE) |
| 313 | { | |
| 314 | 8 | tmp = methodName.substring(BUTTON_LENGTH); |
| 315 | } | |
| 316 | else | |
| 317 | { | |
| 318 | 0 | tmp = methodName.toLowerCase().substring(BUTTON_LENGTH); |
| 319 | } | |
| 320 | } | |
| 321 | ||
| 322 | 8 | return tmp; |
| 323 | } | |
| 324 | ||
| 325 | /** | |
| 326 | * Checks whether the selected key really is a valid event. | |
| 327 | * | |
| 328 | * @param key The selected key | |
| 329 | * @param pp The parameter parser to look for the key value | |
| 330 | * | |
| 331 | * @return true if this key is really an ActionEvent Key | |
| 332 | */ | |
| 333 | protected boolean considerKey(String key, ParameterParser pp) | |
| 334 | { | |
| 335 | 3 | if (!submitValueKey) |
| 336 | { | |
| 337 | 3 | log.debug("No Value required, accepting " + key); |
| 338 | 3 | return true; |
| 339 | } | |
| 340 | else | |
| 341 | { | |
| 342 | // If the action.eventsubmit.needsvalue key is true, | |
| 343 | // events with a "0" or empty value are ignored. | |
| 344 | // This can be used if you have multiple eventSubmit_do<xxx> | |
| 345 | // fields in your form which are selected by client side code, | |
| 346 | // e.g. JavaScript. | |
| 347 | // | |
| 348 | // If this key is unset or missing, nothing changes for the | |
| 349 | // current behavior. | |
| 350 | // | |
| 351 | 0 | String keyValue = pp.getString(key); |
| 352 | 0 | log.debug("Key Value is " + keyValue); |
| 353 | 0 | if (StringUtils.isEmpty(keyValue)) |
| 354 | { | |
| 355 | 0 | log.debug("Key is empty, rejecting " + key); |
| 356 | 0 | return false; |
| 357 | } | |
| 358 | ||
| 359 | try | |
| 360 | { | |
| 361 | 0 | if (Integer.parseInt(keyValue) != 0) |
| 362 | { | |
| 363 | 0 | log.debug("Integer != 0, accepting " + key); |
| 364 | 0 | return true; |
| 365 | } | |
| 366 | } | |
| 367 | 0 | catch (NumberFormatException nfe) |
| 368 | { | |
| 369 | // Not a number. So it might be a | |
| 370 | // normal Key like "continue" or "exit". Accept | |
| 371 | // it. | |
| 372 | 0 | log.debug("Not a number, accepting " + key); |
| 373 | 0 | return true; |
| 374 | 0 | } |
| 375 | } | |
| 376 | 0 | log.debug("Rejecting " + key); |
| 377 | 0 | return false; |
| 378 | } | |
| 379 | } |