Coverage Report - org.apache.turbine.modules.ActionEvent
 
Classes in this File Line Coverage Branch Coverage Complexity
ActionEvent
75%
63/84
65%
29/44
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&lt;xxx&gt; 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&lt;xxx&gt; 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&lt;xxx&gt;
 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  
 }