Class FieldGen

java.lang.Object

org.apache.bcel.classfile.AccessFlags

org.apache.bcel.generic.FieldGenOrMethodGen

org.apache.bcel.generic.FieldGen

All Implemented Interfaces:

Cloneable, NamedAndTyped

public class FieldGen
extends FieldGenOrMethodGen

Template class for building up a field. The only extraordinary thing one can do is to add a constant value attribute to a field (which must of course be compatible with to the declared type).

See Also:

• Field

Field Summary

Fields inherited from class FieldGenOrMethodGen

cp, name, type

Fields inherited from class AccessFlags

access_flags

Constructor Summary

Constructors

Constructor	Description
FieldGen(int accessFlags, Type type, String name, ConstantPoolGen cp)	Declare a field.
FieldGen(Field field, ConstantPoolGen cp)	Instantiate from existing field.

Method Summary

Modifier and Type	Method	Description
void	addObserver(FieldObserver o)	Add observer for this object.
void	cancelInitValue()	Remove any initial value.
FieldGen	copy(ConstantPoolGen cp)
boolean	equals(Object obj)	Return value as defined by given BCELComparator strategy.
static BCELComparator<FieldGen>	getComparator()
Field	getField()	Gets field object after having set up all necessary values.
String	getInitValue()
String	getSignature()
int	hashCode()	Return value as defined by given BCELComparator strategy.
void	removeObserver(FieldObserver o)	Remove observer for this object.
static void	setComparator(BCELComparator<FieldGen> comparator)
void	setInitValue(boolean b)
void	setInitValue(byte b)
void	setInitValue(char c)
void	setInitValue(double d)
void	setInitValue(float f)
void	setInitValue(int i)
void	setInitValue(long l)
void	setInitValue(short s)
void	setInitValue(String str)	Sets (optional) initial value of field, otherwise it will be set to null/0/false by the JVM automatically.
final String	toString()	Return string representation close to declaration format, for example: 'public static final short MAX = 100'.
void	update()	Call notify() method on all observers.

Methods inherited from class FieldGenOrMethodGen

addAll, addAnnotationEntry, addAttribute, clone, getAnnotationEntries, getAttributes, getConstantPool, getName, getType, removeAnnotationEntries, removeAnnotationEntry, removeAttribute, removeAttributes, setConstantPool, setName, setType

Methods inherited from class AccessFlags

getAccessFlags, getModifiers, isAbstract, isAbstract, isAnnotation, isAnnotation, isEnum, isEnum, isFinal, isFinal, isInterface, isInterface, isNative, isNative, isPrivate, isPrivate, isProtected, isProtected, isPublic, isPublic, isStatic, isStatic, isStrictfp, isStrictfp, isSynchronized, isSynchronized, isSynthetic, isSynthetic, isTransient, isTransient, isVarArgs, isVarArgs, isVolatile, isVolatile, setAccessFlags, setModifiers

Methods inherited from class Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

FieldGen

public FieldGen(Field field,
 ConstantPoolGen cp)

Instantiate from existing field.

Parameters:

field - Field object.

cp - constant pool (must contain the same entries as the field's constant pool).

FieldGen

public FieldGen(int accessFlags,
 Type type,
 String name,
 ConstantPoolGen cp)

Declare a field. If it is static (isStatic() == true) and has a basic type like int or String it may have an initial value associated with it as defined by setInitValue().

Parameters:

accessFlags - access qualifiers

type - field type

name - field name

cp - constant pool

Method Details

getComparator

public static BCELComparator<FieldGen> getComparator()

Returns:

Comparison strategy object.

setComparator

public static void setComparator(BCELComparator<FieldGen> comparator)

Parameters:

comparator - Comparison strategy object.

addObserver

public void addObserver(FieldObserver o)

Add observer for this object.

cancelInitValue

public void cancelInitValue()

Remove any initial value.

copy

public FieldGen copy(ConstantPoolGen cp)

Returns:

deep copy of this field

equals

public boolean equals(Object obj)

Return value as defined by given BCELComparator strategy. By default two FieldGen objects are said to be equal when their names and signatures are equal.

Overrides:

equals in class Object

See Also:

• Object.equals(Object)

getField

public Field getField()

Gets field object after having set up all necessary values.

getInitValue

public String getInitValue()

getSignature

public String getSignature()

Specified by:

getSignature in class FieldGenOrMethodGen

Returns:

signature of method/field.

hashCode

public int hashCode()

Return value as defined by given BCELComparator strategy. By default return the hash code of the field's name XOR signature.

Overrides:

hashCode in class Object

See Also:

• Object.hashCode()

removeObserver

public void removeObserver(FieldObserver o)

Remove observer for this object.

setInitValue

public void setInitValue(boolean b)

setInitValue

public void setInitValue(byte b)

setInitValue

public void setInitValue(char c)

setInitValue

public void setInitValue(double d)

setInitValue

public void setInitValue(float f)

setInitValue

public void setInitValue(int i)

setInitValue

public void setInitValue(long l)

setInitValue

public void setInitValue(short s)

setInitValue

public void setInitValue(String str)

Sets (optional) initial value of field, otherwise it will be set to null/0/false by the JVM automatically.

toString

public final String toString()

Return string representation close to declaration format, for example: 'public static final short MAX = 100'.

Overrides:

toString in class Object

Returns:

String representation of field

update

public void update()

Call notify() method on all observers. This method is not called automatically whenever the state has changed, but has to be called by the user after they have finished editing the object.