Package javassist.bytecode

Class FieldInfo

java.lang.Object

javassist.bytecode.FieldInfo

public final class FieldInfo
extends Object

field_info structure.

The following code adds a public field width of int type:

 ClassFile cf = ...
 FieldInfo f = new FieldInfo(cf.getConstPool(), "width", "I");
 f.setAccessFlags(AccessFlag.PUBLIC);
 cf.addField(f);
 

See Also:

• CtField.getFieldInfo()

Constructor Summary

Constructors

Constructor	Description
FieldInfo(ConstPool cp, String fieldName, String desc)	Constructs a field_info structure.

Method Summary

Modifier and Type	Method	Description
void	addAttribute(AttributeInfo info)	Appends an attribute.
int	getAccessFlags()	Returns the access flags.
AttributeInfo	getAttribute(String name)	Returns the attribute with the specified name.
List<AttributeInfo>	getAttributes()	Returns all the attributes.
int	getConstantValue()	Finds a ConstantValue attribute and returns the index into the constant_pool table.
ConstPool	getConstPool()	Returns the constant pool table used by this field_info.
String	getDescriptor()	Returns the field descriptor.
String	getName()	Returns the field name.
AttributeInfo	removeAttribute(String name)	Removes an attribute with the specified name.
void	setAccessFlags(int acc)	Sets the access flags.
void	setDescriptor(String desc)	Sets the field descriptor.
void	setName(String newName)	Sets the field name.
String	toString()	Returns a string representation of the object.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

FieldInfo

public FieldInfo(ConstPool cp,
 String fieldName,
 String desc)

Constructs a field_info structure.

Parameters:

cp - a constant pool table

fieldName - field name

desc - field descriptor

See Also:

• Descriptor

Method Details

toString

public String toString()

Returns a string representation of the object.

Overrides:

toString in class Object

getConstPool

public ConstPool getConstPool()

Returns the constant pool table used by this field_info.

getName

public String getName()

Returns the field name.

setName

public void setName(String newName)

Sets the field name.

getAccessFlags

public int getAccessFlags()

Returns the access flags.

See Also:

• AccessFlag

setAccessFlags

public void setAccessFlags(int acc)

Sets the access flags.

See Also:

• AccessFlag

getDescriptor

public String getDescriptor()

Returns the field descriptor.

See Also:

• Descriptor

setDescriptor

public void setDescriptor(String desc)

Sets the field descriptor.

See Also:

• Descriptor

getConstantValue

public int getConstantValue()

Finds a ConstantValue attribute and returns the index into the constant_pool table.

Returns:

0 if a ConstantValue attribute is not found.

getAttributes

public List<AttributeInfo> getAttributes()

Returns all the attributes. The returned List object is shared with this object. If you add a new attribute to the list, the attribute is also added to the field represented by this object. If you remove an attribute from the list, it is also removed from the field.

Returns:

a list of AttributeInfo objects.

See Also:

• AttributeInfo

getAttribute

public AttributeInfo getAttribute(String name)

Returns the attribute with the specified name. It returns null if the specified attribute is not found.

An attribute name can be obtained by, for example, AnnotationsAttribute.visibleTag or AnnotationsAttribute.invisibleTag.

Parameters:

name - attribute name

See Also:

• getAttributes()

removeAttribute

public AttributeInfo removeAttribute(String name)

Removes an attribute with the specified name.

Parameters:

name - attribute name.

Returns:

the removed attribute or null.

Since:

3.21

addAttribute

public void addAttribute(AttributeInfo info)

Appends an attribute. If there is already an attribute with the same name, the new one substitutes for it.

See Also:

• getAttributes()