Coverage Report - org.apache.tapestry.enhance.EnhancementOperationImpl
 
Classes in this File Line Coverage Branch Coverage Complexity
EnhancementOperationImpl
95% 
97% 
2.395
 
 1  
 // Copyright 2004, 2005 The Apache Software Foundation
 2  
 //
 3  
 // Licensed under the Apache License, Version 2.0 (the "License");
 4  
 // you may not use this file except in compliance with the License.
 5  
 // You may obtain a copy of the License at
 6  
 //
 7  
 //     http://www.apache.org/licenses/LICENSE-2.0
 8  
 //
 9  
 // Unless required by applicable law or agreed to in writing, software
 10  
 // distributed under the License is distributed on an "AS IS" BASIS,
 11  
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12  
 // See the License for the specific language governing permissions and
 13  
 // limitations under the License.
 14  
 
 15  
 package org.apache.tapestry.enhance;
 16  
 
 17  
 import org.apache.commons.logging.Log;
 18  
 import org.apache.hivemind.ApplicationRuntimeException;
 19  
 import org.apache.hivemind.ClassResolver;
 20  
 import org.apache.hivemind.HiveMind;
 21  
 import org.apache.hivemind.Location;
 22  
 import org.apache.hivemind.service.BodyBuilder;
 23  
 import org.apache.hivemind.service.ClassFab;
 24  
 import org.apache.hivemind.service.ClassFactory;
 25  
 import org.apache.hivemind.service.MethodSignature;
 26  
 import org.apache.hivemind.util.Defense;
 27  
 import org.apache.hivemind.util.ToStringBuilder;
 28  
 import org.apache.tapestry.services.ComponentConstructor;
 29  
 import org.apache.tapestry.spec.IComponentSpecification;
 30  
 import org.apache.tapestry.util.IdAllocator;
 31  
 import org.apache.tapestry.util.ObjectIdentityMap;
 32  
 
 33  
 import java.beans.BeanInfo;
 34  
 import java.beans.IntrospectionException;
 35  
 import java.beans.Introspector;
 36  
 import java.beans.PropertyDescriptor;
 37  
 import java.lang.reflect.Constructor;
 38  
 import java.lang.reflect.Method;
 39  
 import java.lang.reflect.Modifier;
 40  
 import java.util.*;
 41  
 
 42  
 /**
 43  
  * Implementation of {@link org.apache.tapestry.enhance.EnhancementOperation}that
 44  
  * knows how to collect class changes from enhancements. The method
 45  
  * {@link #getConstructor()} finalizes the enhancement into a
 46  
  * {@link org.apache.tapestry.services.ComponentConstructor}.
 47  
  *
 48  
  * @author Howard M. Lewis Ship
 49  
  * @since 4.0
 50  
  */
 51  
 public class EnhancementOperationImpl implements EnhancementOperation
 52  
 {
 53  1
     static int _uid = 0;
 54  
 
 55  
     private ClassResolver _resolver;
 56  
 
 57  
     private IComponentSpecification _specification;
 58  
 
 59  
     private Class _baseClass;
 60  
 
 61  
     private ClassFab _classFab;
 62  
 
 63  137
     private final Set _claimedProperties = new HashSet();
 64  
 
 65  137
     private final JavaClassMapping _javaClassMapping = new JavaClassMapping();
 66  
 
 67  137
     private final List _constructorTypes = new ArrayList();
 68  
 
 69  137
     private final List _constructorArguments = new ArrayList();
 70  
 
 71  137
     private final ObjectIdentityMap _finalFields = new ObjectIdentityMap();
 72  
 
 73  
     /**
 74  
      * Set of interfaces added to the enhanced class.
 75  
      */
 76  
 
 77  137
     private Set _addedInterfaces = new HashSet();
 78  
 
 79  
     /**
 80  
      * Map of {@link BodyBuilder}, keyed on {@link MethodSignature}.
 81  
      */
 82  
 
 83  137
     private Map _incompleteMethods = new HashMap();
 84  
 
 85  
     /**
 86  
      * Map of property names to {@link PropertyDescriptor}.
 87  
      */
 88  
 
 89  137
     private Map _properties = new HashMap();
 90  
 
 91  
     /**
 92  
      * Used to incrementally assemble the constructor for the enhanced class.
 93  
      */
 94  
 
 95  
     private BodyBuilder _constructorBuilder;
 96  
 
 97  
     /**
 98  
      * Makes sure that names created by
 99  
      * {@link #addInjectedField(String, Class, Object)} have unique names.
 100  
      */
 101  
 
 102  137
     private final IdAllocator _idAllocator = new IdAllocator();
 103  
 
 104  
     /**
 105  
      * Map keyed on MethodSignature, value is Location. Used to track which
 106  
      * methods have been created, based on which location data (identified
 107  
      * conflicts).
 108  
      */
 109  
 
 110  137
     private final Map _methods = new HashMap();
 111  
 
 112  
     // May be null
 113  
 
 114  
     private final Log _log;
 115  
 
 116  
     /**
 117  
      * Alternate package private constructor used by the test suite, to bypass
 118  
      * the defense checks above.
 119  
      */
 120  
 
 121  
     EnhancementOperationImpl()
 122  1
     {
 123  1
         _log = null;
 124  1
     }
 125  
 
 126  
     public EnhancementOperationImpl(ClassResolver classResolver,
 127  
                                     IComponentSpecification specification, Class baseClass,
 128  
                                     ClassFactory classFactory, Log log)
 129  136
     {
 130  136
         Defense.notNull(classResolver, "classResolver");
 131  136
         Defense.notNull(specification, "specification");
 132  136
         Defense.notNull(baseClass, "baseClass");
 133  136
         Defense.notNull(classFactory, "classFactory");
 134  
 
 135  136
         _resolver = classResolver;
 136  136
         _specification = specification;
 137  136
         _baseClass = baseClass;
 138  
 
 139  136
         introspectBaseClass();
 140  
 
 141  136
         String name = newClassName();
 142  
 
 143  136
         _classFab = classFactory.newClass(name, _baseClass);
 144  136
         _log = log;
 145  136
     }
 146  
 
 147  
     public String toString()
 148  
     {
 149  0
         ToStringBuilder builder = new ToStringBuilder(this);
 150  
 
 151  0
         builder.append("baseClass", _baseClass.getName());
 152  0
         builder.append("claimedProperties", _claimedProperties);
 153  0
         builder.append("classFab", _classFab);
 154  
 
 155  0
         return builder.toString();
 156  
     }
 157  
 
 158  
     /**
 159  
      * We want to find the properties of the class, but in many cases, the class
 160  
      * is abstract. Some JDK's (Sun) will include public methods from interfaces
 161  
      * implemented by the class in the public declared methods for the class
 162  
      * (which is used by the Introspector). Eclipse's built-in compiler does not
 163  
      * appear to (this may have to do with compiler options I've been unable to
 164  
      * track down). The solution is to augment the information provided directly
 165  
      * by the Introspector with additional information compiled by Introspecting
 166  
      * the interfaces directly or indirectly implemented by the class.
 167  
      */
 168  
     private void introspectBaseClass()
 169  
     {
 170  
         try
 171  
         {
 172  136
             synchronized(HiveMind.INTROSPECTOR_MUTEX)
 173  
             {
 174  136
                 addPropertiesDeclaredInBaseClass();
 175  136
             }
 176  
         }
 177  0
         catch (IntrospectionException ex)
 178  
         {
 179  0
             throw new ApplicationRuntimeException(EnhanceMessages.unabelToIntrospectClass(_baseClass, ex), ex);
 180  136
         }
 181  
 
 182  136
     }
 183  
 
 184  
     private void addPropertiesDeclaredInBaseClass()
 185  
       throws IntrospectionException
 186  
     {
 187  136
         Class introspectClass = _baseClass;
 188  
 
 189  136
         addPropertiesDeclaredInClass(introspectClass);
 190  
 
 191  136
         List interfaceQueue = new ArrayList();
 192  
 
 193  809
         while(introspectClass != null)
 194  
         {
 195  673
             addInterfacesToQueue(introspectClass, interfaceQueue);
 196  
 
 197  673
             introspectClass = introspectClass.getSuperclass();
 198  
         }
 199  
 
 200  2317
         while(!interfaceQueue.isEmpty())
 201  
         {
 202  2181
             Class interfaceClass = (Class) interfaceQueue.remove(0);
 203  
 
 204  2181
             addPropertiesDeclaredInClass(interfaceClass);
 205  
 
 206  2181
             addInterfacesToQueue(interfaceClass, interfaceQueue);
 207  2181
         }
 208  136
     }
 209  
 
 210  
     private void addInterfacesToQueue(Class introspectClass, List interfaceQueue)
 211  
     {
 212  2854
         Class[] interfaces = introspectClass.getInterfaces();
 213  
 
 214  5035
         for(int i = 0; i < interfaces.length; i++)
 215  2181
             interfaceQueue.add(interfaces[i]);
 216  2854
     }
 217  
 
 218  
     private void addPropertiesDeclaredInClass(Class introspectClass)
 219  
       throws IntrospectionException
 220  
     {
 221  
 
 222  2317
         BeanInfo bi = Introspector.getBeanInfo(introspectClass);
 223  
 
 224  2317
         PropertyDescriptor[] pds = bi.getPropertyDescriptors();
 225  
 
 226  14497
         for(int i = 0; i < pds.length; i++)
 227  
         {
 228  12180
             PropertyDescriptor pd = pds[i];
 229  
 
 230  12180
             String name = pd.getName();
 231  
 
 232  12180
             if (!_properties.containsKey(name))
 233  4857
                 _properties.put(name, pd);
 234  
         }
 235  2317
     }
 236  
 
 237  
     public void claimProperty(String propertyName)
 238  
     {
 239  1244
         Defense.notNull(propertyName, "propertyName");
 240  
 
 241  1244
         if (_claimedProperties.contains(propertyName))
 242  2
             throw new ApplicationRuntimeException(EnhanceMessages.claimedProperty(propertyName));
 243  
 
 244  1242
         _claimedProperties.add(propertyName);
 245  1242
     }
 246  
 
 247  
     /**
 248  
      * {@inheritDoc}
 249  
      */
 250  
     public boolean canClaimAsReadOnlyProperty(String propertyName)
 251  
     {
 252  2
         if(_claimedProperties.contains(propertyName))
 253  1
             return false;
 254  
 
 255  1
         PropertyDescriptor pd = getPropertyDescriptor(propertyName);
 256  
 
 257  1
         if (pd == null)
 258  1
             return false;
 259  
 
 260  0
         return pd.getWriteMethod() == null ? true : false;
 261  
     }
 262  
 
 263  
     public void claimReadonlyProperty(String propertyName)
 264  
     {
 265  135
         claimProperty(propertyName);
 266  
 
 267  135
         PropertyDescriptor pd = getPropertyDescriptor(propertyName);
 268  
 
 269  135
         if (pd != null && pd.getWriteMethod() != null)
 270  1
             throw new ApplicationRuntimeException(EnhanceMessages.readonlyProperty(propertyName, pd.getWriteMethod()));
 271  134
     }
 272  
 
 273  
     public void addField(String name, Class type)
 274  
     {
 275  2055
         _classFab.addField(name, type);
 276  2055
     }
 277  
 
 278  
     public String addInjectedField(String fieldName, Class fieldType, Object value)
 279  
     {
 280  135
         Defense.notNull(fieldName, "fieldName");
 281  135
         Defense.notNull(fieldType, "fieldType");
 282  135
         Defense.notNull(value, "value");
 283  
 
 284  135
         String existing = (String) _finalFields.get(value);
 285  
 
 286  
         // See if this object has been previously added.
 287  
 
 288  135
         if (existing != null)
 289  0
             return existing;
 290  
 
 291  
         // TODO: Should be ensure that the name is unique?
 292  
 
 293  
         // Make sure that the field has a unique name (at least, among anything
 294  
         // added
 295  
         // via addFinalField().
 296  
 
 297  135
         String uniqueName = _idAllocator.allocateId(fieldName);
 298  
 
 299  
         // ClassFab doesn't have an option for saying the field should be final,
 300  
         // just private.
 301  
         // Doesn't make a huge difference.
 302  
 
 303  135
         _classFab.addField(uniqueName, fieldType);
 304  
 
 305  135
         int parameterIndex = addConstructorParameter(fieldType, value);
 306  
 
 307  135
         constructorBuilder().addln("{0} = ${1};", uniqueName, Integer.toString(parameterIndex));
 308  
 
 309  
         // Remember the mapping from the value to the field name.
 310  
 
 311  135
         _finalFields.put(value, uniqueName);
 312  
 
 313  135
         return uniqueName;
 314  
     }
 315  
 
 316  
     public Class convertTypeName(String type)
 317  
     {
 318  6
         Defense.notNull(type, "type");
 319  
 
 320  6
         Class result = _javaClassMapping.getType(type);
 321  
 
 322  6
         if (result == null)
 323  
         {
 324  4
             result = _resolver.findClass(type);
 325  
 
 326  3
             _javaClassMapping.recordType(type, result);
 327  
         }
 328  
 
 329  5
         return result;
 330  
     }
 331  
 
 332  
     public Class getPropertyType(String name)
 333  
     {
 334  1107
         Defense.notNull(name, "name");
 335  
 
 336  1107
         PropertyDescriptor pd = getPropertyDescriptor(name);
 337  
 
 338  1107
         return pd == null ? null : pd.getPropertyType();
 339  
     }
 340  
 
 341  
     public void validateProperty(String name, Class expectedType)
 342  
     {
 343  3
         Defense.notNull(name, "name");
 344  3
         Defense.notNull(expectedType, "expectedType");
 345  
 
 346  3
         PropertyDescriptor pd = getPropertyDescriptor(name);
 347  
 
 348  3
         if (pd == null)
 349  1
             return;
 350  
 
 351  2
         Class propertyType = pd.getPropertyType();
 352  
 
 353  2
         if (propertyType.equals(expectedType))
 354  1
             return;
 355  
 
 356  1
         throw new ApplicationRuntimeException(EnhanceMessages.propertyTypeMismatch(_baseClass, name, propertyType, expectedType));
 357  
     }
 358  
 
 359  
     PropertyDescriptor getPropertyDescriptor(String name)
 360  
     {
 361  2462
         return (PropertyDescriptor) _properties.get(name);
 362  
     }
 363  
 
 364  
     public String getAccessorMethodName(String propertyName)
 365  
     {
 366  1216
         Defense.notNull(propertyName, "propertyName");
 367  
 
 368  1216
         PropertyDescriptor pd = getPropertyDescriptor(propertyName);
 369  
 
 370  1216
         if (pd != null && pd.getReadMethod() != null)
 371  1152
             return pd.getReadMethod().getName();
 372  
 
 373  64
         return EnhanceUtils.createAccessorMethodName(propertyName);
 374  
     }
 375  
 
 376  
     public void addMethod(int modifier, MethodSignature sig, String methodBody, Location location)
 377  
     {
 378  2341
         Defense.notNull(sig, "sig");
 379  2341
         Defense.notNull(methodBody, "methodBody");
 380  2341
         Defense.notNull(location, "location");
 381  
 
 382  2341
         Location existing = (Location) _methods.get(sig);
 383  2341
         if (existing != null)
 384  1
             throw new ApplicationRuntimeException(EnhanceMessages.methodConflict(sig, existing), location, null);
 385  
 
 386  2340
         _methods.put(sig, location);
 387  
 
 388  2340
         _classFab.addMethod(modifier, sig, methodBody);
 389  2340
     }
 390  
 
 391  
     public Class getBaseClass()
 392  
     {
 393  1
         return _baseClass;
 394  
     }
 395  
 
 396  
     public String getClassReference(Class clazz)
 397  
     {
 398  3
         Defense.notNull(clazz, "clazz");
 399  
 
 400  3
         String result = (String) _finalFields.get(clazz);
 401  
 
 402  3
         if (result == null)
 403  2
             result = addClassReference(clazz);
 404  
 
 405  3
         return result;
 406  
     }
 407  
 
 408  
     private String addClassReference(Class clazz)
 409  
     {
 410  2
         StringBuffer buffer = new StringBuffer("_class$");
 411  
 
 412  2
         Class c = clazz;
 413  
 
 414  3
         while(c.isArray())
 415  
         {
 416  1
             buffer.append("array$");
 417  1
             c = c.getComponentType();
 418  
         }
 419  
 
 420  2
         buffer.append(c.getName().replace('.', '$'));
 421  
 
 422  2
         String fieldName = buffer.toString();
 423  
 
 424  4
         return addInjectedField(fieldName, Class.class, clazz);
 425  
     }
 426  
 
 427  
     /**
 428  
      * Adds a new constructor parameter, returning the new count. This is
 429  
      * convienient, because the first element added is accessed as $1, etc.
 430  
      */
 431  
 
 432  
     private int addConstructorParameter(Class type, Object value)
 433  
     {
 434  135
         _constructorTypes.add(type);
 435  135
         _constructorArguments.add(value);
 436  
 
 437  135
         return _constructorArguments.size();
 438  
     }
 439  
 
 440  
     private BodyBuilder constructorBuilder()
 441  
     {
 442  135
         if (_constructorBuilder == null)
 443  
         {
 444  112
             _constructorBuilder = new BodyBuilder();
 445  112
             _constructorBuilder.begin();
 446  
         }
 447  
 
 448  135
         return _constructorBuilder;
 449  
     }
 450  
 
 451  
     /**
 452  
      * Returns an object that can be used to construct instances of the enhanced
 453  
      * component subclass. This should only be called once.
 454  
      */
 455  
 
 456  
     public ComponentConstructor getConstructor()
 457  
     {
 458  
         try
 459  
         {
 460  115
             finalizeEnhancedClass();
 461  
 
 462  115
             Constructor c = findConstructor();
 463  
 
 464  114
             Object[] params = _constructorArguments.toArray();
 465  
 
 466  114
             return new ComponentConstructorImpl(c, params, _classFab.toString(), _specification.getLocation());
 467  
         }
 468  1
         catch (Throwable t)
 469  
         {
 470  1
             throw new ApplicationRuntimeException(EnhanceMessages.classEnhancementFailure(_baseClass, t), _classFab, null, t);
 471  
         }
 472  
     }
 473  
 
 474  
     void finalizeEnhancedClass()
 475  
     {
 476  116
         finalizeIncompleteMethods();
 477  
 
 478  116
         if (_constructorBuilder != null)
 479  
         {
 480  111
             _constructorBuilder.end();
 481  
 
 482  111
             Class[] types = (Class[]) _constructorTypes.toArray(new Class[_constructorTypes.size()]);
 483  
 
 484  111
             _classFab.addConstructor(types, null, _constructorBuilder.toString());
 485  
         }
 486  
 
 487  116
         if (_log != null && _log.isDebugEnabled())
 488  0
             _log.debug("Creating class:\n\n" + _classFab);
 489  116
     }
 490  
 
 491  
     private void finalizeIncompleteMethods()
 492  
     {
 493  116
         Iterator i = _incompleteMethods.entrySet().iterator();
 494  292
         while(i.hasNext())
 495  
         {
 496  176
             Map.Entry e = (Map.Entry) i.next();
 497  176
             MethodSignature sig = (MethodSignature) e.getKey();
 498  176
             BodyBuilder builder = (BodyBuilder) e.getValue();
 499  
 
 500  
             // Each BodyBuilder is created and given a begin(), this is
 501  
             // the matching end()
 502  
 
 503  176
             builder.end();
 504  
 
 505  176
             _classFab.addMethod(Modifier.PUBLIC, sig, builder.toString());
 506  176
         }
 507  116
     }
 508  
 
 509  
     private Constructor findConstructor()
 510  
     {
 511  115
         Class componentClass = _classFab.createClass();
 512  
 
 513  
         // The fabricated base class always has exactly one constructor
 514  
 
 515  114
         return componentClass.getConstructors()[0];
 516  
     }
 517  
 
 518  
     private String newClassName()
 519  
     {
 520  136
         String baseName = _baseClass.getName();
 521  136
         int dotx = baseName.lastIndexOf('.');
 522  
 
 523  136
         return "$" + baseName.substring(dotx + 1) + "_" + _uid++;
 524  
     }
 525  
 
 526  
     public void extendMethodImplementation(Class interfaceClass, MethodSignature methodSignature, String code)
 527  
     {
 528  1865
         addInterfaceIfNeeded(interfaceClass);
 529  
 
 530  1865
         BodyBuilder builder = (BodyBuilder) _incompleteMethods.get(methodSignature);
 531  
 
 532  1865
         if (builder == null)
 533  
         {
 534  178
             builder = createIncompleteMethod(methodSignature);
 535  
 
 536  178
             _incompleteMethods.put(methodSignature, builder);
 537  
         }
 538  
 
 539  1865
         builder.addln(code);
 540  1865
     }
 541  
 
 542  
     private void addInterfaceIfNeeded(Class interfaceClass)
 543  
     {
 544  1865
         if (implementsInterface(interfaceClass))
 545  1769
             return;
 546  
 
 547  96
         _classFab.addInterface(interfaceClass);
 548  96
         _addedInterfaces.add(interfaceClass);
 549  96
     }
 550  
 
 551  
     public boolean implementsInterface(Class interfaceClass)
 552  
     {
 553  1869
         if (interfaceClass.isAssignableFrom(_baseClass))
 554  925
             return true;
 555  
 
 556  944
         Iterator i = _addedInterfaces.iterator();
 557  953
         while(i.hasNext())
 558  
         {
 559  855
             Class addedInterface = (Class) i.next();
 560  
 
 561  855
             if (interfaceClass.isAssignableFrom(addedInterface))
 562  846
                 return true;
 563  9
         }
 564  
 
 565  98
         return false;
 566  
     }
 567  
 
 568  
     private BodyBuilder createIncompleteMethod(MethodSignature sig)
 569  
     {
 570  178
         BodyBuilder result = new BodyBuilder();
 571  
 
 572  
         // Matched inside finalizeIncompleteMethods()
 573  
 
 574  178
         result.begin();
 575  
 
 576  178
         if (existingImplementation(sig))
 577  81
             result.addln("super.{0}($$);", sig.getName());
 578  
 
 579  178
         return result;
 580  
     }
 581  
 
 582  
     /**
 583  
      * Returns true if the base class implements the provided method as either a
 584  
      * public or a protected method.
 585  
      */
 586  
 
 587  
     private boolean existingImplementation(MethodSignature sig)
 588  
     {
 589  178
         Method m = findMethod(sig);
 590  
 
 591  178
         return m != null && !Modifier.isAbstract(m.getModifiers());
 592  
     }
 593  
 
 594  
     /**
 595  
      * Finds a public or protected method in the base class.
 596  
      */
 597  
     private Method findMethod(MethodSignature sig)
 598  
     {
 599  
         // Finding a public method is easy:
 600  
 
 601  
         try
 602  
         {
 603  178
             return _baseClass.getMethod(sig.getName(), sig.getParameterTypes());
 604  
 
 605  
         }
 606  97
         catch (NoSuchMethodException ex)
 607  
         {
 608  
             // Good; no super-implementation to invoke.
 609  
         }
 610  
 
 611  97
         Class c = _baseClass;
 612  
 
 613  465
         while(c != Object.class)
 614  
         {
 615  
             try
 616  
             {
 617  369
                 return c.getDeclaredMethod(sig.getName(), sig
 618  
                   .getParameterTypes());
 619  
             }
 620  368
             catch (NoSuchMethodException ex)
 621  
             {
 622  
                 // Ok, continue loop up to next base class.
 623  
             }
 624  
 
 625  368
             c = c.getSuperclass();
 626  
         }
 627  
 
 628  96
         return null;
 629  
     }
 630  
 
 631  
     public List findUnclaimedAbstractProperties()
 632  
     {
 633  90
         List result = new ArrayList();
 634  
 
 635  90
         Iterator i = _properties.values().iterator();
 636  
 
 637  3416
         while(i.hasNext())
 638  
         {
 639  3326
             PropertyDescriptor pd = (PropertyDescriptor) i.next();
 640  
 
 641  3326
             String name = pd.getName();
 642  
 
 643  3326
             if (_claimedProperties.contains(name))
 644  240
                 continue;
 645  
 
 646  3086
             if (isAbstractProperty(pd))
 647  932
                 result.add(name);
 648  3086
         }
 649  
 
 650  90
         return result;
 651  
     }
 652  
 
 653  
     /**
 654  
      * A property is abstract if either its read method or it write method is
 655  
      * abstract. We could do some additional checking to ensure that both are
 656  
      * abstract if either is. Note that in many cases, there will only be one
 657  
      * accessor (a reader or a writer).
 658  
      */
 659  
     private boolean isAbstractProperty(PropertyDescriptor pd)
 660  
     {
 661  3086
         return isExistingAbstractMethod(pd.getReadMethod())
 662  
                || isExistingAbstractMethod(pd.getWriteMethod());
 663  
     }
 664  
 
 665  
     private boolean isExistingAbstractMethod(Method m)
 666  
     {
 667  5282
         return m != null && Modifier.isAbstract(m.getModifiers());
 668  
     }
 669  
 
 670  
     public IComponentSpecification getSpecification()
 671  
     {
 672  0
         return _specification;
 673  
     }
 674  
 }