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	Description
static final String	tag	The name of the AnnotationDefault attribute.

Fields inherited from class AttributeInfo

constPool, info, name

Constructor Summary

Constructors

Constructor	Description
AnnotationDefaultAttribute(ConstPool cp)	Constructs an empty AnnotationDefault_attribute.
AnnotationDefaultAttribute(ConstPool cp, byte[] info)	Constructs an AnnotationDefault_attribute.
AnnotationDefaultAttribute(ConstPool cp, int n, DataInputStream in)

Method Summary

Modifier and Type	Method	Description
AttributeInfo	copy(ConstPool newCp, Map<String,String> classnames)	Copies this attribute and returns a new copy.
MemberValue	getDefaultValue()	Obtains the default value represented by this attribute.
(package private) void	renameClass(String oldname, String newname)
(package private) void	renameClass(Map<String,String> classnames)
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 AttributeInfo

copyAll, get, getConstPool, getLength, getName, getRefClasses, getRefClasses, length, lookup, read, remove, renameClass, renameClass, set, write, writeAll

Methods inherited from class Object

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

Field Details

tag

public static final String tag

The name of the AnnotationDefault attribute.

See Also:

• Constant Field Values

Constructor Details

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)

AnnotationDefaultAttribute

AnnotationDefaultAttribute(ConstPool cp,
 int n,
 DataInputStream in)
                    throws IOException

Parameters:

n - the attribute name.

Throws:

IOException

Method Details

copy

public AttributeInfo copy(ConstPool newCp,
 Map<String,String> 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.

renameClass

void renameClass(String oldname,
 String newname)

Overrides:

renameClass in class AttributeInfo

renameClass

void renameClass(Map<String,String> classnames)

Overrides:

renameClass in class AttributeInfo

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