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

   }
   
   @Override
   protected ClassPool getCreateParentClassPools(ClassLoader cl, ClassPool src, ScopedClassPoolRepository repository)
   {
      ClassPool parent = super.getCreateParentClassPools(cl, src, repository);
      if (parent == ClassPool.getDefault())
      {
         //In AS BaseClassLoader seems to normally have a null parent
         return null;
      }

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        if (args.length != 1) {
            System.err.println("Usage: java javassist.tools.framedump <class file name>");
            return;
        }
        
        ClassPool pool = ClassPool.getDefault();
        CtClass clazz = pool.get(args[0]);
        System.out.println("Frame Dump of " + clazz.getName() + ":");
        FramePrinter.print(clazz, System.out);
    }

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     * @param src       the source of classs files.
     */
    public AppletServer(int port, ClassPool src)
        throws IOException, NotFoundException, CannotCompileException
    {
        this(new ClassPool(src), new StubGenerator(), port);
    }

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      this.registry = registry;
   }
   
   public ScopedClassPool create(ClassLoader cl, ClassPool src, ScopedClassPoolRepository repository)
   {      
      ClassPool parent = getCreateParentClassPools(cl, src, repository);


      ScopedClassPool pool = null;
      
      if (cl instanceof RealClassLoader)
      {
         Module module = registry.getModule(cl);
         if (module != null && module.getDeterminedParentDomainName() != null)
         {
            //It is scoped
            ClassLoaderSystem sys = registry.getSystem();
            ClassLoaderDomain domain = sys.getDomain(module.getDeterminedDomainName());
            boolean parentFirst = module.isJ2seClassLoadingCompliance();
            ClassPool parentDomainPool = getParentUnitClassPool(cl); 
            pool = new ScopedJBoss5ClassPool(cl, parent, parentDomainPool, repository, getTempURL(module), parentFirst, domain);
         }
         else
         {
            pool =  new JBoss5ClassPool(cl, parent, repository, getTempURL(module));

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      }
      


      try
      {
         ClassPool pool = getCorrectPoolForResource(classname, resourcename, url, trace);
         if (trace)
         {
            logger.trace("getCached() Found pool for class " + classname + " " + pool);
         }
         if (pool != lastPool.get())
         {
            lastPool.set(pool);
            CtClass found = pool.get(classname);
            if (trace)
            {
               logger.trace("getCached() Found clazz " + classname + " in " + pool + " : " + found);
            }
            return found;

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   private ClassPool createTempPool()
   {
      //Rememeber that the stuff in jboss5/lib goes in a child classloader of the default classloader. We need
      //to make this the parent of the temp classloader
      ClassLoader aopLoader = AspectManager.class.getClassLoader();
      ClassPool pool = AspectManager.instance().registerClassLoader(aopLoader);
      return AOPClassPool.createAOPClassPool(pool, AOPClassPoolRepository.getInstance());
   }

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    private static void processClasses(CompiledClass[] entries, int n)
        throws Exception
    {
        Reflection implementor = new Reflection();
        ClassPool pool = ClassPool.getDefault();
        implementor.start(pool);


        for (int i = 0; i < n; ++i) {
            CtClass c = pool.get(entries[i].classname);
            if (entries[i].metaobject != null
                                        || entries[i].classobject != null) {
                String metaobj, classobj;


                if (entries[i].metaobject == null)
                    metaobj = "javassist.tools.reflect.Metaobject";
                else
                    metaobj = entries[i].metaobject;


                if (entries[i].classobject == null)
                    classobj = "javassist.tools.reflect.ClassMetaobject";
                else
                    classobj = entries[i].classobject;


                if (!implementor.makeReflective(c, pool.get(metaobj),
                                              pool.get(classobj)))
                    System.err.println("Warning: " + c.getName()
                                + " is reflective.  It was not changed.");


                System.err.println(c.getName() + ": " + metaobj + ", "
                                   + classobj);
            }
            else
                System.err.println(c.getName() + ": not reflective");
        }


        for (int i = 0; i < n; ++i) {
            implementor.onLoad(pool, entries[i].classname);
            pool.get(entries[i].classname).writeFile();
        }
    }

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    public Loader() throws CannotCompileException, NotFoundException {
        super();
        delegateLoadingOf("javassist.tools.reflect.Loader");


        reflection = new Reflection();
        ClassPool pool = ClassPool.getDefault();
        addTranslator(pool, reflection);
    }

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    public CtClass getCtClass() {
        CtClass clazz = component.getCtClass();
        if (clazz == null)
            return null;


        ClassPool pool = clazz.getClassPool();
        if (pool == null)
            pool = ClassPool.getDefault();


        String name = arrayName(clazz.getName(), dims);


        try {
            return pool.get(name);
        } catch (NotFoundException e) {
            throw new RuntimeException(e);
        }
    }

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        mergeExceptionHandlers(queue, method, pos, frame);
    }


    private ExceptionInfo[] buildExceptionInfo(MethodInfo method) {
        ConstPool constPool = method.getConstPool();
        ClassPool classes = clazz.getClassPool();


        ExceptionTable table = method.getCodeAttribute().getExceptionTable();
        ExceptionInfo[] exceptions = new ExceptionInfo[table.size()];
        for (int i = 0; i < table.size(); i++) {
            int index = table.catchType(i);
            Type type;
            try {
                type = index == 0 ? Type.THROWABLE : Type.get(classes.get(constPool.getClassInfo(index)));
            } catch (NotFoundException e) {
                throw new IllegalStateException(e.getMessage());
            }


            exceptions[i] = new ExceptionInfo(table.startPc(i), table.endPc(i), table.handlerPc(i), type);

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