Examples of javassist.ClassPool

javassist.ClassPool
A container of CtClass objects. A CtClass object must be obtained from this object. If get() is called on this object, it searches various sources represented by ClassPath to find a class file and then it creates a CtClass object representing that class file. The created object is returned to the caller.
Memory consumption memo:
ClassPool objects hold all the CtClasses that have been created so that the consistency among modified classes can be guaranteed. Thus if a large number of CtClasses are processed, the ClassPool will consume a huge amount of memory. To avoid this, a ClassPool object should be recreated, for example, every hundred classes processed. Note that getDefault() is a singleton factory. Otherwise, detach() in CtClass should be used to avoid huge memory consumption.
ClassPool hierarchy:
ClassPools can make a parent-child hierarchy as java.lang.ClassLoaders. If a ClassPool has a parent pool, get() first asks the parent pool to find a class file. Only if the parent could not find the class file, get() searches the ClassPaths of the child ClassPool. This search order is reversed if ClassPath.childFirstLookup is true. @see javassist.CtClass @see javassist.ClassPath

        return className.startsWith(classToAccept);
    }


    public byte[] transform(ClassLoader loader, String className, byte[] classfileBuffer) {


        ClassPool pool = createClassPool(loader);


        CtClass clazz = getCtClass(className, pool);


        byte[] newByteCode = transformClassCode(className, classfileBuffer, pool, clazz);

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    protected ClassPool createClassPool()
    {
        ClassLoader loader = _resourceResolver.getClassLoader();
        
        // create a new ClassPool and make sure it uses the application resource resolver 
        ClassPool classPool = new ClassPool(null);
        classPool.insertClassPath(new LoaderClassPath(loader));
        
        return classPool;
    }

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    public ClassFabricator getClassFabricator()
    {
        if (_classFabricator == null)
        {
            CtClass jaParentClass = getObjectType(_parentClass.getName());
            ClassPool classPool = _classFactory.getClassPool();
            _classFabricator = new ClassFabricator(_className, jaParentClass, classPool);
        }
        return _classFabricator;
    }

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  /**
   * @return
   */
  public static BeanInterface createJavassistBean() {
    try {
      ClassPool classPool = new ClassPool();
      classPool.appendClassPath(new LoaderClassPath(BeanInterface.class
          .getClassLoader()));
      CtClass theClass = classPool
          .makeClass(ClassFabUtils.generateClassName( BeanInterface.class ) );


      theClass.addInterface(classPool.get(BeanInterface.class.getName()));
      CtMethod theMethod = new CtMethod(
          classPool.get("java.lang.String"), "interfaceMethod",
          new CtClass[0], theClass);
      theMethod.setBody("return \"Hello, World!\";");
      theClass.addMethod(theMethod);
      Class clazz = theClass.toClass();
      return ( BeanInterface )clazz.newInstance();

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    }


    private void createSynthComponentClass(String name) throws CannotCompileException,
            NotFoundException, IOException
    {
        ClassPool pool = new ClassPool();
        // Inside Maven Surefire, the system classpath is not sufficient to find all
        // the necessary files.
        pool.appendClassPath(new LoaderClassPath(_extraLoader));


        CtClass ctClass = pool.makeClass(SYNTH_COMPONENT_CLASSNAME);


        ctClass.setSuperclass(pool.get(BasicComponent.class.getName()));


        // Implement method getName()


        CtMethod method = CtNewMethod.make(
                "public String getName() { return \"" + name + "\"; }",
                ctClass);
        ctClass.addMethod(method);


        ctClass.addInterface(pool.get(Named.class.getName()));


        ctClass.writeFile(_extraClasspath.getAbsolutePath());
    }

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   private static int counter = 0;


   private static CtClass createProxyCtClass(ProxyMixin[] mixins, Class<?> clazz)
   throws Exception
   {
      ClassPool pool = AspectManager.instance().findClassPool(clazz.getClassLoader());
      if (pool == null) throw new NullPointerException("Could not find ClassPool");


      String classname = "AOPClassProxy$" + counter++;


      CtClass template = pool.get("org.jboss.aop.proxy.ClassProxyTemplate");
      CtClass superclass = pool.get(clazz.getName());
      
      CtField mixinField = template.getField("mixins");
      CtField instanceAdvisor = template.getField("instanceAdvisor");
      
      CtClass proxy = TransformerCommon.makeClass(pool, classname, superclass);
      
      mixinField = new CtField(mixinField.getType(), "mixins", proxy);
      mixinField.setModifiers(Modifier.PRIVATE);
      proxy.addField(mixinField);
      instanceAdvisor = new CtField(instanceAdvisor.getType(), "instanceAdvisor", proxy);
      instanceAdvisor.setModifiers(Modifier.PRIVATE);
      proxy.addField(instanceAdvisor);


      CtMethod writeEx = CtNewMethod.make("   public void writeExternal(java.io.ObjectOutput out)\n" +
                                          "   throws java.io.IOException\n" +
                                          "   {\n" +
                                          "   }", proxy);
      CtMethod readEx = CtNewMethod.make("   public void readExternal(java.io.ObjectInput in)\n" +
                                         "   throws java.io.IOException, ClassNotFoundException\n" +
                                         "   {\n" +
                                         "   }", proxy);
      CtMethod getInstanceAdvisor = CtNewMethod.make("   public org.jboss.aop.InstanceAdvisor _getInstanceAdvisor()\n" +
                                                     "   {\n" +
                                                     "      return instanceAdvisor;\n" +
                                                     "   }", proxy);
      CtMethod setInstanceAdvisor = CtNewMethod.make("   public void _setInstanceAdvisor(org.jboss.aop.InstanceAdvisor newAdvisor)\n" +
                                                     "   {\n" +
                                                     "      instanceAdvisor = (org.jboss.aop.ClassInstanceAdvisor) newAdvisor;\n" +
                                                     "   }", proxy);
      CtMethod dynamicInvoke = CtNewMethod.make("   public org.jboss.aop.joinpoint.InvocationResponse _dynamicInvoke(org.jboss.aop.joinpoint.Invocation invocation)\n" +
                                                "   throws Throwable\n" +
                                                "   {\n" +
                                                "      ((org.jboss.aop.joinpoint.InvocationBase) invocation).setInstanceResolver(instanceAdvisor.getMetaData());\n" +
                                                "      org.jboss.aop.advice.Interceptor[] aspects = instanceAdvisor.getInterceptors();\n" +
                                                "      return new org.jboss.aop.joinpoint.InvocationResponse(invocation.invokeNext(aspects));\n" +
                                                "   }", proxy);


      CtMethod setMixins = CtNewMethod.make("   public void setMixins(org.jboss.aop.proxy.ProxyMixin[] mixins)\n" +
                                            "   {\n" +
                                            "      this.mixins = mixins;\n" +
                                            "   }", proxy);


      CtMethod writeReplace = CtNewMethod.make("   public Object writeReplace() throws java.io.ObjectStreamException\n" +
                                               "   {\n" +
                                               "      return new org.jboss.aop.proxy.MarshalledClassProxy(this.getClass().getSuperclass(), mixins, instanceAdvisor);\n" +
                                               "   }", proxy);




      proxy.addMethod(writeEx);
      proxy.addMethod(readEx);
      proxy.addMethod(getInstanceAdvisor);
      proxy.addMethod(setInstanceAdvisor);
      proxy.addMethod(dynamicInvoke);
      proxy.addMethod(setMixins);
      proxy.addMethod(writeReplace);


      /*
      CtMethod writeEx = template.getDeclaredMethod("writeExternal");
      CtMethod readEx = template.getDeclaredMethod("readExternal");
      CtMethod getInstanceAdvisor = template.getDeclaredMethod("_getInstanceAdvisor");
      CtMethod setInstanceAdvisor = template.getDeclaredMethod("_setInstanceAdvisor");
      CtMethod dynamicInvoke = template.getDeclaredMethod("_dynamicInvoke");
      CtMethod setMixins = template.getDeclaredMethod("setMixins");
      CtMethod writeReplace = template.getDeclaredMethod("writeReplace");








      proxy.addMethod(CtNewMethod.copy(writeEx, proxy, null));
      proxy.addMethod(CtNewMethod.copy(readEx, proxy, null));
      proxy.addMethod(CtNewMethod.copy(getInstanceAdvisor, proxy, null));
      proxy.addMethod(CtNewMethod.copy(setInstanceAdvisor, proxy, null));
      proxy.addMethod(CtNewMethod.copy(dynamicInvoke, proxy, null));
      proxy.addMethod(CtNewMethod.copy(setMixins, proxy, null));
      proxy.addMethod(CtNewMethod.copy(writeReplace, proxy, null));
      */




      proxy.addInterface(pool.get("org.jboss.aop.proxy.ClassProxy"));
      proxy.addInterface(pool.get("java.io.Externalizable"));
      proxy.addInterface(pool.get("org.jboss.aop.instrument.Untransformable"));
      proxy.addInterface(pool.get("org.jboss.aop.proxy.MethodMapped"));


      CtClass map = pool.get("java.util.Map");
      CtField methodMap = new CtField(map, "methodMap", proxy);
      methodMap.setModifiers(Modifier.PRIVATE | Modifier.STATIC);
      proxy.addField(methodMap);
      CtMethod getMethodMap = CtNewMethod.getter("getMethodMap", methodMap);
      getMethodMap.setModifiers(Modifier.PUBLIC);
      proxy.addMethod(getMethodMap);


      HashSet<String> addedInterfaces = new HashSet<String>();
      HashSet<Long> addedMethods = new HashSet<Long>();
      if (mixins != null)
      {
         for (int i = 0; i < mixins.length; i++)
         {
            HashSet<Long> mixinMethods = new HashSet<Long>();
            Class<?>[] mixinf = mixins[i].getInterfaces();
            ClassPool mixPool = AspectManager.instance().findClassPool(mixins[i].getMixin().getClass().getClassLoader());
            CtClass mixClass = mixPool.get(mixins[i].getMixin().getClass().getName());
            for (int j = 0; j < mixinf.length; j++)
            {
               if (addedInterfaces.contains(mixinf[j].getName())) throw new Exception("2 mixins are implementing the same interfaces");
               ClassPool mixIntfPool = AspectManager.instance().findClassPool(mixinf[j].getClassLoader());
               CtClass intfClass = mixIntfPool.get(mixinf[j].getName());
               CtMethod[] methods = intfClass.getMethods();
               for (int m = 0; m < methods.length; m++)
               {
                  if (methods[m].getDeclaringClass().getName().equals("java.lang.Object")) continue;
                  Long hash = new Long(JavassistMethodHashing.methodHash(methods[m]));

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         }  
         else
         {
            //We need to do all the work again
            AspectManager manager = AspectManager.instance();
            ClassPool pool = manager.findClassPool(classloader);
            ProtectionDomain pd = advisorClass.getProtectionDomain();
            generatedClass = generateJoinpointClass(pool, info, classloader, pd);
            generatedJoinPointClassCache.put(infoAdviceString, generatedClass);
         }
         Object obj = generatedClass.createJoinPointInstance(classloader, info);

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    }


    // Phase 2


    void evalExpected(TypedBlock target) throws BadBytecode {
        ClassPool cp = classPool;
        evalExpected(cp, target.stackTop, target.stackTypes);
        TypeData[] types = target.localsTypes;
        if (types != null)  // unless this block is dead code
            evalExpected(cp, types.length, types);
    }

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      if (initiatingPool == null)
      {
         if (trace) logger.trace(this + " get cached or create " + classname + " from pool parent - no initiating pool");
         return null;
      }
      ClassPool parentPool = initiatingPool.getParent();
      if (parentPool == null)
      {
         if (trace) logger.trace(this + " get cached or create " + classname + " from pool parent - no parent pool");
         return null;
      }

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    * @param classLoader the ClassLoader to be added to this repository
    * @return the ClassPool corresponding to {@code classLoader}
    */
   public ClassPool registerClassLoader(ClassLoader classLoader)
   {
      ClassPool classPool = registryHandler.registerClassLoader(classLoader);
      // TODO review classPool != null check for AOP tests
      if (callbacks != null && callbacks.size() > 0)
      {
         for (ClassPoolRepositoryCallback callback : callbacks)
         {

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