Examples of javassist.bytecode.AnnotationsAttribute

javassist.bytecode.AnnotationsAttribute
A class representing RuntimeVisibleAnnotations_attribute and RuntimeInvisibleAnnotations_attribute.
To obtain an AnnotationAttribute object, invoke getAttribute(AnnotationsAttribute.visibleTag) in ClassFile, MethodInfo, or FieldInfo. The obtained attribute is a runtime visible annotations attribute. If the parameter is AnnotationAttribute.invisibleTag, then the obtained attribute is a runtime invisible one.
For example,
This code snippet retrieves an annotation of the type Author from the MethodInfo object specified by minfo. Then, it prints the value of name in Author.
If the annotation type Author is annotated by a meta annotation:
Then Author is visible at runtime. Therefore, the third statement of the code snippet above must be changed into:
The attribute tag must be visibleTag instead of invisibleTag.
If the member value of an annotation is not specified, the default value is used as that member value. If so, getMemberValue() in Annotation returns null since the default value is not included in the AnnotationsAttribute. It is included in the AnnotationDefaultAttribute of the method declared in the annotation type.
If you want to record a new AnnotationAttribute object, execute the following snippet:
The last statement is necessary if the class file was produced by Javassist or JDK 1.4. Otherwise, it is not necessary. @see AnnotationDefaultAttribute @see javassist.bytecode.annotation.Annotation

                Class<?>[] parameterTypes = method.getParameterTypes();
                Annotation[][] parameterAnnotations = method.getParameterAnnotations();
                for (int i = 0; i < parameterTypes.length; i ++) {
                    Class<?> type = parameterTypes[i];
                    Annotation[] annotations = parameterAnnotations[i];
                    AnnotationsAttribute attribute = new AnnotationsAttribute(classFile.getConstPool(), AnnotationsAttribute.visibleTag);
                    for (Annotation annotation : annotations) {
                        if (annotation.annotationType().isAnnotationPresent(Constraint.class)) {
                            javassist.bytecode.annotation.Annotation ja = new javassist.bytecode.annotation.Annotation(
                                    classFile.getConstPool(), pool.getCtClass(annotation.annotationType().getName()));
                            Method[] members = annotation.annotationType().getMethods();
                            for (Method member : members) {
                                if (Modifier.isPublic(member.getModifiers())
                                        && member.getParameterTypes().length == 0
                                        && member.getDeclaringClass() == annotation.annotationType()) {
                                    Object value = member.invoke(annotation, new Object[0]);
                                    if (value != null && ! value.equals(member.getDefaultValue())) {
                                        MemberValue memberValue = createMemberValue(
                                                classFile.getConstPool(), pool.get(member.getReturnType().getName()), value);
                                        ja.addMemberValue(member.getName(), memberValue);
                                    }
                                }
                            }
                            attribute.addAnnotation(ja);
                        }
                    }
                    String fieldName = method.getName() + "Argument" + i;
                    CtField ctField = CtField.make("public " + type.getCanonicalName() + " " + fieldName + ";", pool.getCtClass(parameterClassName));
                    ctField.getFieldInfo().addAttribute(attribute);

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   protected static boolean hasAnnotations(ClassFile classFile, Set<Class<? extends Annotation>> annotationTypes)
   {
      if (annotationTypes.size() > 0)
      {
         AnnotationsAttribute visible = (AnnotationsAttribute) classFile.getAttribute( AnnotationsAttribute.visibleTag );
         if ( visible != null ) 
         {
            for (Class<? extends Annotation> annotationType : annotationTypes)
            {
               if (visible.getAnnotation(annotationType.getName()) != null)
               {
                  return true;
               }
            }
         }

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        NEXT_SETTER_NAME
    );
  }


  private AnnotationsAttribute getVisibleAnnotations(FieldInfo fieldInfo) {
    AnnotationsAttribute annotationsAttribute = (AnnotationsAttribute) fieldInfo.getAttribute( AnnotationsAttribute.visibleTag );
    if ( annotationsAttribute == null ) {
      annotationsAttribute = new AnnotationsAttribute( fieldInfo.getConstPool(), AnnotationsAttribute.visibleTag );
      fieldInfo.addAttribute( annotationsAttribute );
    }
    return annotationsAttribute;
  }

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    // make that new field (1) private, (2) transient and (3) @Transient
    if ( makeTransient ) {
      theField.setModifiers( theField.getModifiers() | Modifier.TRANSIENT );
    }
    theField.setModifiers( Modifier.setPrivate( theField.getModifiers() ) );
    AnnotationsAttribute annotationsAttribute = getVisibleAnnotations( theField.getFieldInfo() );
    annotationsAttribute.addAnnotation( new Annotation( Transient.class.getName(), constPool ) );
    return theField;
  }

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    }


    protected void scanClass(ClassFile cf)
    {
        String className = cf.getName();
        AnnotationsAttribute visible = (AnnotationsAttribute) cf.getAttribute(AnnotationsAttribute.visibleTag);
        AnnotationsAttribute invisible = (AnnotationsAttribute) cf.getAttribute(AnnotationsAttribute.invisibleTag);


        if (visible != null)
        {
            populate(visible.getAnnotations(), className);
        }


        if (invisible != null)
        {
            populate(invisible.getAnnotations(), className);
        }
    }

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        for (Object obj : methods)
        {
            MethodInfo method = (MethodInfo) obj;
            if (scanMethodAnnotations)
            {
                AnnotationsAttribute visible = (AnnotationsAttribute) method.getAttribute(AnnotationsAttribute.visibleTag);
                AnnotationsAttribute invisible = (AnnotationsAttribute) method.getAttribute(AnnotationsAttribute.invisibleTag);


                if (visible != null)
                {
                    populate(visible.getAnnotations(), cf.getName());
                }
                if (invisible != null)
                {
                    populate(invisible.getAnnotations(), cf.getName());
                }
            }
            if (scanParameterAnnotations)
            {
                ParameterAnnotationsAttribute paramsVisible = (ParameterAnnotationsAttribute) method.getAttribute(ParameterAnnotationsAttribute.visibleTag);

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        }


        for (Object obj : fields)
        {
            FieldInfo field = (FieldInfo) obj;
            AnnotationsAttribute visible = (AnnotationsAttribute) field.getAttribute(AnnotationsAttribute.visibleTag);
            AnnotationsAttribute invisible = (AnnotationsAttribute) field.getAttribute(AnnotationsAttribute.invisibleTag);


            if (visible != null)
            {
                populate(visible.getAnnotations(), cf.getName());
            }
            if (invisible != null)
            {
                populate(invisible.getAnnotations(), cf.getName());
            }
        }




    }

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    private Object[] getAnnotations(boolean ignoreNotFound)
        throws ClassNotFoundException
    {
        ClassFile cf = getClassFile2();
        AnnotationsAttribute ainfo = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.invisibleTag);  
        AnnotationsAttribute ainfo2 = (AnnotationsAttribute)
                cf.getAttribute(AnnotationsAttribute.visibleTag);  
        return toAnnotationType(ignoreNotFound, getClassPool(), ainfo, ainfo2);
    }

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                                ctMethod.setBody("return runCommandWithResult($1, $2, \"" + shellCommandName + "\");");
                            }


                            // if help for this command is found - add GoGo descriptor for this shell command
                            if (help.containsKey(shellCommandName)) {
                                AnnotationsAttribute annotationsAttribute = new AnnotationsAttribute(constPool, AnnotationsAttribute.visibleTag);
                                Annotation annotation = new Annotation(Descriptor.class.getName(), constPool);
                                annotation.addMemberValue("value", new StringMemberValue(help.get(shellCommandName), constPool)); //todo: add help
                                annotationsAttribute.addAnnotation(annotation);
                                ctMethod.getMethodInfo().addAttribute(annotationsAttribute);
                            }


                            // add method to class
                            ctClass.addMethod(ctMethod);

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    /**
     * Retrieve all class annotations.
     */
    protected static AnnotationsAttribute getAnnotations(CtClass ctClass) {
        AnnotationsAttribute annotationsAttribute = (AnnotationsAttribute) ctClass.getClassFile().getAttribute(AnnotationsAttribute.visibleTag);
        if (annotationsAttribute == null) {
            annotationsAttribute = new AnnotationsAttribute(ctClass.getClassFile().getConstPool(), AnnotationsAttribute.visibleTag);
            ctClass.getClassFile().addAttribute(annotationsAttribute);
        }
        return annotationsAttribute;
    }

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