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edu.ucsb.ccs.jbcd.transformation
Class ClassTransformer  

java.lang.Object
  edu.ucsb.ccs.jbcd.transformation.ClassTransformer

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public class ClassTransformer

extends java.lang.Object

A ClassTransformer executes a complex transformation on a JavaClass object. The complex transform is made up of simpler transforms that are carried out in sequence on the class itself and on each method.

Transformations are stored as a list, and are executed in the order that they appear. The list may be modified with insert(Transformation) and append(Transformation). Use the transform(JavaClass) method to apply the transformations to a class.

Version:

$Id: ClassTransformer.java,v 1.2 2003/01/04 08:35:15 parkera Exp $

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Field Summary
protected  org.apache.bcel.generic.ConstantPoolGen	constantPoolGen           A ConstantPoolGen for currentClass.
protected  org.apache.bcel.classfile.JavaClass	currentClass           The class currently being transformed.
protected  org.apache.bcel.generic.InstructionFactory	instructionFactory           An instruction factory to use when creating bytecode into a class.
protected  MethodSet	methodSet           A set of methods that will be in the current class after transformation.
protected  java.util.Hashtable	sharedInfo           A hashtable of data that is shared between transformations.
protected  java.util.LinkedList	transforms           List to store transforms.

 

Constructor Summary

ClassTransformer()           Create an empty ClassTransformer.

 

Method Summary
protected  boolean	_Invariant()
protected  boolean	append_Postcondition(Transformation t, java.lang.Void RESULT)
protected  boolean	append_Precondition(Transformation t)
void	append(Transformation t)           Add a Transformation at the end of the transformation list.
org.apache.bcel.generic.ConstantPoolGen	getConstantPoolGen()           Get the ConstantPoolGen object that is to be used to build the constant pool for the current class.
org.apache.bcel.classfile.JavaClass	getCurrentClass()           Get the class that the transformer is transforming.
protected  boolean	getInstructionFactory_Postcondition(org.apache.bcel.generic.InstructionFactory RESULT)
org.apache.bcel.generic.InstructionFactory	getInstructionFactory()           Get the instruction factory that should be used to create instructions.
MethodSet	getMethodSet()           Get the method set that holds working copies of the methods in the current class.
java.util.Hashtable	getSharedInfo()           Get the shared data table.
protected  boolean	insert_Postcondition(Transformation t, java.lang.Void RESULT)
protected  boolean	insert_Precondition(Transformation t)
void	insert(Transformation t)           Insert a transformation at the beginning of the list.
protected  boolean	setInstructionFactory_Postcondition(org.apache.bcel.generic.InstructionFactory factory)
protected  boolean	setInstructionFactory_Precondition(org.apache.bcel.generic.InstructionFactory factory)
void	setInstructionFactory(org.apache.bcel.generic.InstructionFactory factory)           Set the instruction factory to be used to create bytecode for the current class.
protected  boolean	size_Postcondition(int RESULT)
int	size()           Get the number of transformations in the transformer.
protected  boolean	transform_Precondition(org.apache.bcel.classfile.JavaClass javaclass)
void	transform(org.apache.bcel.classfile.JavaClass javaclass)           Transform a class.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

currentClass

protected org.apache.bcel.classfile.JavaClass currentClass

The class currently being transformed.

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constantPoolGen

protected org.apache.bcel.generic.ConstantPoolGen constantPoolGen

A ConstantPoolGen for currentClass.

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methodSet

protected MethodSet methodSet

A set of methods that will be in the current class after transformation. Note that the result of currentClass.getMethods() will not neccessarily match this set because Transformations may add and remove methods from the set.

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sharedInfo

protected java.util.Hashtable sharedInfo

A hashtable of data that is shared between transformations. A transformation that has data needed by other transformations may store it in this table, under some published key.

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transforms

protected java.util.LinkedList transforms

List to store transforms. The transforms are applied to a class in the order that they appear in this list.

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instructionFactory

protected org.apache.bcel.generic.InstructionFactory instructionFactory

An instruction factory to use when creating bytecode into a class. The `transform(JavaClass)' method sets the constant pool used by this factory to the correct constant pool for the current class. The default factory can be overridden with setInstructionFactory(InstructionFactory).

Constructor Detail

ClassTransformer

public ClassTransformer()

Create an empty ClassTransformer.

Method Detail

transform

public void transform(org.apache.bcel.classfile.JavaClass javaclass)
               throws AbortTransformationException

Transform a class. Each Transform in `transforms' will be offered the opportunity to operate on the class. The transforms will be applied in the order in which they appear in the `transforms' list.

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transform_Precondition

protected boolean transform_Precondition(org.apache.bcel.classfile.JavaClass javaclass)

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insert

public void insert(Transformation t)

Insert a transformation at the beginning of the list.

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insert_Precondition

protected boolean insert_Precondition(Transformation t)

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insert_Postcondition

protected boolean insert_Postcondition(Transformation t,
                                       java.lang.Void RESULT)

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append

public void append(Transformation t)

Add a Transformation at the end of the transformation list.

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append_Precondition

protected boolean append_Precondition(Transformation t)

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append_Postcondition

protected boolean append_Postcondition(Transformation t,
                                       java.lang.Void RESULT)

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size

public int size()

Get the number of transformations in the transformer.

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size_Postcondition

protected boolean size_Postcondition(int RESULT)

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getCurrentClass

public org.apache.bcel.classfile.JavaClass getCurrentClass()

Get the class that the transformer is transforming. The current class is only meaningful when executing the transform method, so only Transformation objects should call this method.

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getConstantPoolGen

public org.apache.bcel.generic.ConstantPoolGen getConstantPoolGen()

Get the ConstantPoolGen object that is to be used to build the constant pool for the current class. This is only meaningful when executing the transform method (when there is a current class), so only Transformation objects should call this method.

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getMethodSet

public MethodSet getMethodSet()

Get the method set that holds working copies of the methods in the current class. This set is only meaningful when executing the transform method, so only Transformation objects should call this method.

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getSharedInfo

public java.util.Hashtable getSharedInfo()

Get the shared data table. This table is provided so that Transformations can communicate with each other in a crude way. If one transformation has a piece of data needed by a subsequent transformation, it may store it in this table, indexed by a published key. This table is cleared between calls to transform.

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getInstructionFactory

public org.apache.bcel.generic.InstructionFactory getInstructionFactory()

Get the instruction factory that should be used to create instructions. This factory has been initialized with the correct constant pool for the current class.

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getInstructionFactory_Postcondition

protected boolean getInstructionFactory_Postcondition(org.apache.bcel.generic.InstructionFactory RESULT)

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setInstructionFactory

public void setInstructionFactory(org.apache.bcel.generic.InstructionFactory factory)

Set the instruction factory to be used to create bytecode for the current class. The constant pool in this factory will be set by the transform(JavaClass) method, so it is not neccessary to reset the factory after every class is transformed.

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setInstructionFactory_Precondition

protected boolean setInstructionFactory_Precondition(org.apache.bcel.generic.InstructionFactory factory)

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setInstructionFactory_Postcondition

protected boolean setInstructionFactory_Postcondition(org.apache.bcel.generic.InstructionFactory factory)

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_Invariant

protected boolean _Invariant()

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> edu >> ucsb >> ccs >> jbcd >> [ transformation overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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