javassist.bytecode

Class AnnotationDefaultAttribute

java.lang.Object

javassist.bytecode.AttributeInfo

javassist.bytecode.AnnotationDefaultAttribute

public class AnnotationDefaultAttribute
extends AttributeInfo

A class representing AnnotationDefault_attribute.

For example, if you declare the following annotation type:

 @interface Author {
   String name() default "Shakespeare";
   int age() default 99;
 }
 

The defautl values of name and age are stored as annotation default attributes in Author.class. The following code snippet obtains the default value of name:

 ClassPool pool = ...
 CtClass cc = pool.get("Author");
 CtMethod cm = cc.getDeclaredMethod("age");
 MethodInfo minfo = cm.getMethodInfo();
 AnnotationDefaultAttribute ada
         = (AnnotationDefaultAttribute)
           minfo.getAttribute(AnnotationDefaultAttribute.tag);
 MemberValue value = ada.getDefaultValue());    // default value of age
 

If the following statement is executed after the code above, the default value of age is set to 80:

 ada.setDefaultValue(new IntegerMemberValue(minfo.getConstPool(), 80));
 

See Also:

AnnotationsAttribute, MemberValue

Field Summary

Fields

Modifier and Type	Field and Description
static String	tag The name of the AnnotationDefault attribute.

Fields inherited from class javassist.bytecode.AttributeInfo

constPool

Constructor Summary

Constructors

Constructor and Description
AnnotationDefaultAttribute(ConstPool cp) Constructs an empty AnnotationDefault_attribute.
AnnotationDefaultAttribute(ConstPool cp, byte[] info) Constructs an AnnotationDefault_attribute.

Method Summary

Methods

Modifier and Type	Method and Description
AttributeInfo	copy(ConstPool newCp, Map classnames) Copies this attribute and returns a new copy.
MemberValue	getDefaultValue() Obtains the default value represented by this attribute.
void	setDefaultValue(MemberValue value) Changes the default value represented by this attribute.
String	toString() Returns a string representation of this object.

Methods inherited from class javassist.bytecode.AttributeInfo

get, getConstPool, getName, length, set

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

tag

public static final String tag

The name of the AnnotationDefault attribute.

See Also:

Constant Field Values

Constructor Detail

AnnotationDefaultAttribute

public AnnotationDefaultAttribute(ConstPool cp,
                          byte[] info)

Constructs an AnnotationDefault_attribute.

Parameters:

cp - constant pool

info - the contents of this attribute. It does not include attribute_name_index or attribute_length.

AnnotationDefaultAttribute

public AnnotationDefaultAttribute(ConstPool cp)

Constructs an empty AnnotationDefault_attribute. The default value can be set by setDefaultValue().

Parameters:

cp - constant pool

See Also:

setDefaultValue(javassist.bytecode.annotation.MemberValue)

Method Detail

copy

public AttributeInfo copy(ConstPool newCp,
                 Map classnames)

Copies this attribute and returns a new copy.

Overrides:

copy in class AttributeInfo

Parameters:

newCp - the constant pool table used by the new copy.

classnames - pairs of replaced and substituted class names.

getDefaultValue

public MemberValue getDefaultValue()

Obtains the default value represented by this attribute.

setDefaultValue

public void setDefaultValue(MemberValue value)

Changes the default value represented by this attribute.

Parameters:

value - the new value.

See Also:

Annotation.createMemberValue(ConstPool, CtClass)

toString

public String toString()

Returns a string representation of this object.

Overrides:

toString in class Object