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


    /**
     * Retrieve all field annotations.
     */    
    protected static AnnotationsAttribute getAnnotations(CtField ctField) {
        AnnotationsAttribute annotationsAttribute = (AnnotationsAttribute) ctField.getFieldInfo().getAttribute(AnnotationsAttribute.visibleTag);
        if (annotationsAttribute == null) {
            annotationsAttribute = new AnnotationsAttribute(ctField.getFieldInfo().getConstPool(), AnnotationsAttribute.visibleTag);
            ctField.getFieldInfo().addAttribute(annotationsAttribute);
        }
        return annotationsAttribute;
    }

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    /**
     * Retrieve all method annotations.
     */    
    protected static AnnotationsAttribute getAnnotations(CtMethod ctMethod) {
        AnnotationsAttribute annotationsAttribute = (AnnotationsAttribute) ctMethod.getMethodInfo().getAttribute(AnnotationsAttribute.visibleTag);
        if (annotationsAttribute == null) {
            annotationsAttribute = new AnnotationsAttribute(ctMethod.getMethodInfo().getConstPool(), AnnotationsAttribute.visibleTag);
            ctMethod.getMethodInfo().addAttribute(annotationsAttribute);
        }
        return annotationsAttribute;
    }

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public class JavassistUtils
{
   public static void addFieldAnnotation(CtField field, javassist.bytecode.annotation.Annotation annotation)
   {
      FieldInfo fieldInfo = field.getFieldInfo();
      AnnotationsAttribute attribute = (AnnotationsAttribute) fieldInfo.getAttribute(AnnotationsAttribute.visibleTag);
      if (attribute == null)
         attribute = new AnnotationsAttribute(fieldInfo.getConstPool(), AnnotationsAttribute.visibleTag);
      attribute.addAnnotation(annotation);
      fieldInfo.addAttribute(attribute);
   }

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   }


   public static void addClassAnnotation(CtClass clazz, javassist.bytecode.annotation.Annotation annotation)
   {
      ClassFile classFile = clazz.getClassFile();
      AnnotationsAttribute attribute = (AnnotationsAttribute) classFile.getAttribute(AnnotationsAttribute.visibleTag);
      if (attribute == null)
         attribute = new AnnotationsAttribute(classFile.getConstPool(), AnnotationsAttribute.visibleTag);
      attribute.addAnnotation(annotation);
      classFile.addAttribute(attribute);
   }

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public class JavassistUtils
{
   public static void addFieldAnnotation(CtField field, javassist.bytecode.annotation.Annotation annotation)
   {
      FieldInfo fieldInfo = field.getFieldInfo();
      AnnotationsAttribute attribute = (AnnotationsAttribute) fieldInfo.getAttribute(AnnotationsAttribute.visibleTag);
      if (attribute == null)
         attribute = new AnnotationsAttribute(fieldInfo.getConstPool(), AnnotationsAttribute.visibleTag);
      attribute.addAnnotation(annotation);
      fieldInfo.addAttribute(attribute);
   }

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   }


   public static void addClassAnnotation(CtClass clazz, javassist.bytecode.annotation.Annotation annotation)
   {
      ClassFile classFile = clazz.getClassFile();
      AnnotationsAttribute attribute = (AnnotationsAttribute) classFile.getAttribute(AnnotationsAttribute.visibleTag);
      if (attribute == null)
         attribute = new AnnotationsAttribute(classFile.getConstPool(), AnnotationsAttribute.visibleTag);
      attribute.addAnnotation(annotation);
      classFile.addAttribute(attribute);
   }

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                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.get(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]);
                                    MemberValue memberValue = createMemberValue(
                                            classFile.getConstPool(), pool.getCtClass(member.getReturnType().getCanonicalName()), 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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    private static void addNewAnnotations(Annotation[] add, CtMethod method, ConstPool constpool, ClassPool classPool, AnnotationsAttribute attr)
        throws IllegalAccessException, NotFoundException, InvocationTargetException
    {
        if (null == attr) {
            attr = new AnnotationsAttribute(constpool, AnnotationsAttribute.visibleTag);
            method.getMethodInfo().addAttribute(attr);
        }
        for (Annotation toAdd : add) {
            attr.addAnnotation(toJavassist(toAdd, constpool, classPool));
        }

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        }
    }


    private static AnnotationsAttribute filterExistingAnnotations(Annotation[] remove, CtMethod method)
    {
        AnnotationsAttribute attr = null;
        final List attributes = method.getMethodInfo().getAttributes();
        for (Object attribute : attributes) {
            if (attribute instanceof AnnotationsAttribute) {
                attr = (AnnotationsAttribute) attribute;
                final List<javassist.bytecode.annotation.Annotation> annotations = new ArrayList<javassist.bytecode.annotation.Annotation>();
                for (javassist.bytecode.annotation.Annotation annotation : attr.getAnnotations()) {
                    boolean shouldRemove = false;
                    for (Annotation annotationToRemove : remove) {
                        if (annotationToRemove.annotationType().getCanonicalName().equals(annotation.getTypeName())) {
                            shouldRemove = true;
                        }
                    }
                    if (!shouldRemove) {
                        annotations.add(annotation);
                    }
                }
                attr.setAnnotations(annotations.toArray(new javassist.bytecode.annotation.Annotation[annotations.size()]));
            }
        }
        return attr;
    }

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        ClassPool pool = ClassPool.getDefault();
        CtClass cc = pool.get(clazz.getCanonicalName());
        for (CtMethod method : cc.getDeclaredMethods()) {
            ClassFile ccFile = cc.getClassFile();
            ConstPool constpool = ccFile.getConstPool();
            AnnotationsAttribute attr;
            attr = filterExistingAnnotations(add, method);
            addNewAnnotations(add, method, constpool, pool, attr);
        }
        cc.setName(cc.getName() + "$ClassModifier$" + COUNTER.increment());
        cc.setSuperclass(pool.get(clazz.getCanonicalName()));

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