Package org.apache.bcel.generic

Class ClassGen

java.lang.Object

org.apache.bcel.classfile.AccessFlags

org.apache.bcel.generic.ClassGen

All Implemented Interfaces:

Cloneable

public class ClassGen
extends AccessFlags
implements Cloneable

Template class for building up a java class. May be initialized with an existing Java class (file).

See Also:

• JavaClass

Field Summary

Fields inherited from class org.apache.bcel.classfile.AccessFlags

access_flags

Constructor Summary

Constructors

Constructor	Description
ClassGen(String className, String superClassName, String fileName, int accessFlags, String[] interfaces)	Convenience constructor to set up some important values initially.
ClassGen(String className, String superClassName, String fileName, int accessFlags, String[] interfaces, ConstantPoolGen cp)	Convenience constructor to set up some important values initially.
ClassGen(JavaClass clazz)	Constructs a new instance from an existing class.

Method Summary

Modifier and Type	Method	Description
void	addAnnotationEntry(AnnotationEntryGen a)
void	addAttribute(Attribute a)	Add an attribute to this class.
void	addEmptyConstructor(int accessFlags)	Convenience method.
void	addField(Field f)	Add a field to this class.
void	addInterface(String name)	Add an interface to this class, i.e., this class has to implement it.
void	addMethod(Method m)	Add a method to this class.
void	addObserver(ClassObserver o)	Add observer for this object.
Object	clone()
Field	containsField(String name)
boolean	containsField(Field f)
Method	containsMethod(String name, String signature)
boolean	equals(Object obj)	Return value as defined by given BCELComparator strategy.
AnnotationEntryGen[]	getAnnotationEntries()
Attribute[]	getAttributes()
String	getClassName()
int	getClassNameIndex()
static BCELComparator<ClassGen>	getComparator()
ConstantPoolGen	getConstantPool()
Field[]	getFields()
String	getFileName()
String[]	getInterfaceNames()
int[]	getInterfaces()
JavaClass	getJavaClass()
int	getMajor()
Method	getMethodAt(int pos)
Method[]	getMethods()
int	getMinor()
String	getSuperclassName()
int	getSuperclassNameIndex()
int	hashCode()	Return value as defined by given BCELComparator strategy.
void	removeAttribute(Attribute a)	Remove an attribute from this class.
void	removeField(Field f)	Remove a field to this class.
void	removeInterface(String name)	Remove an interface from this class.
void	removeMethod(Method m)	Remove a method from this class.
void	removeObserver(ClassObserver o)	Remove observer for this object.
void	replaceField(Field old, Field newField)	Replace given field with new one.
void	replaceMethod(Method old, Method newMethod)	Replace given method with new one.
void	setClassName(String name)
void	setClassNameIndex(int classNameIndex)
static void	setComparator(BCELComparator<ClassGen> comparator)
void	setConstantPool(ConstantPoolGen constantPool)
void	setMajor(int major)	Sets major version number of class file, default value is 45 (JDK 1.1)
void	setMethodAt(Method method, int pos)
void	setMethods(Method[] methods)
void	setMinor(int minor)	Sets minor version number of class file, default value is 3 (JDK 1.1)
void	setSuperclassName(String name)
void	setSuperclassNameIndex(int superclassNameIndex)
void	update()	Call notify() method on all observers.

Methods inherited from class org.apache.bcel.classfile.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 java.lang.Object

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

Constructor Details

ClassGen

public ClassGen(JavaClass clazz)

Constructs a new instance from an existing class.

Parameters:

clazz - JavaClass object (e.g. read from file)

ClassGen

public ClassGen(String className,
 String superClassName,
 String fileName,
 int accessFlags,
 String[] interfaces)

Convenience constructor to set up some important values initially.

Parameters:

className - fully qualified class name

superClassName - fully qualified superclass name

fileName - source file name

accessFlags - access qualifiers

interfaces - implemented interfaces

ClassGen

public ClassGen(String className,
 String superClassName,
 String fileName,
 int accessFlags,
 String[] interfaces,
 ConstantPoolGen cp)

Convenience constructor to set up some important values initially.

Parameters:

className - fully qualified class name

superClassName - fully qualified superclass name

fileName - source file name

accessFlags - access qualifiers

interfaces - implemented interfaces

cp - constant pool to use

Method Details

getComparator

public static BCELComparator<ClassGen> getComparator()

Returns:

Comparison strategy object

setComparator

public static void setComparator(BCELComparator<ClassGen> comparator)

Parameters:

comparator - Comparison strategy object

addAnnotationEntry

public void addAnnotationEntry(AnnotationEntryGen a)

addAttribute

public void addAttribute(Attribute a)

Add an attribute to this class.

Parameters:

a - attribute to add

addEmptyConstructor

public void addEmptyConstructor(int accessFlags)

Convenience method. Add an empty constructor to this class that does nothing but calling super().

Parameters:

accessFlags - rights for constructor

addField

public void addField(Field f)

Add a field to this class.

Parameters:

f - field to add

addInterface

public void addInterface(String name)

Add an interface to this class, i.e., this class has to implement it.

Parameters:

name - interface to implement (fully qualified class name)

addMethod

public void addMethod(Method m)

Add a method to this class.

Parameters:

m - method to add

addObserver

public void addObserver(ClassObserver o)

Add observer for this object.

clone

public Object clone()

Overrides:

clone in class Object

containsField

public boolean containsField(Field f)

containsField

public Field containsField(String name)

Returns:

field object with given name, or null

containsMethod

public Method containsMethod(String name,
 String signature)

Returns:

method object with given name and signature, or null

equals

public boolean equals(Object obj)

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

Overrides:

equals in class Object

See Also:

• Object.equals(Object)

getAnnotationEntries

public AnnotationEntryGen[] getAnnotationEntries()

getAttributes

public Attribute[] getAttributes()

getClassName

public String getClassName()

getClassNameIndex

public int getClassNameIndex()

getConstantPool

public ConstantPoolGen getConstantPool()

getFields

public Field[] getFields()

getFileName

public String getFileName()

getInterfaceNames

public String[] getInterfaceNames()

getInterfaces

public int[] getInterfaces()

getJavaClass

public JavaClass getJavaClass()

Returns:

the (finally) built up Java class object.

getMajor

public int getMajor()

Returns:

major version number of class file

getMethodAt

public Method getMethodAt(int pos)

getMethods

public Method[] getMethods()

getMinor

public int getMinor()

Returns:

minor version number of class file

getSuperclassName

public String getSuperclassName()

getSuperclassNameIndex

public int getSuperclassNameIndex()

hashCode

public int hashCode()

Return value as defined by given BCELComparator strategy. By default return the hash code of the class name.

Overrides:

hashCode in class Object

See Also:

• Object.hashCode()

removeAttribute

public void removeAttribute(Attribute a)

Remove an attribute from this class.

Parameters:

a - attribute to remove

removeField

public void removeField(Field f)

Remove a field to this class.

Parameters:

f - field to remove

removeInterface

public void removeInterface(String name)

Remove an interface from this class.

Parameters:

name - interface to remove (fully qualified name)

removeMethod

public void removeMethod(Method m)

Remove a method from this class.

Parameters:

m - method to remove

removeObserver

public void removeObserver(ClassObserver o)

Remove observer for this object.

replaceField

public void replaceField(Field old,
 Field newField)

Replace given field with new one. If the old one does not exist add the new_ field to the class anyway.

replaceMethod

public void replaceMethod(Method old,
 Method newMethod)

Replace given method with new one. If the old one does not exist add the newMethod method to the class anyway.

setClassName

public void setClassName(String name)

setClassNameIndex

public void setClassNameIndex(int classNameIndex)

setConstantPool

public void setConstantPool(ConstantPoolGen constantPool)

setMajor

public void setMajor(int major)

Sets major version number of class file, default value is 45 (JDK 1.1)

Parameters:

major - major version number

setMethodAt

public void setMethodAt(Method method,
 int pos)

setMethods

public void setMethods(Method[] methods)

setMinor

public void setMinor(int minor)

Sets minor version number of class file, default value is 3 (JDK 1.1)

Parameters:

minor - minor version number

setSuperclassName

public void setSuperclassName(String name)

setSuperclassNameIndex

public void setSuperclassNameIndex(int superclassNameIndex)

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.