classUtils.javassist.sample.vector
Class VectorAssistant

java.lang.Object
  classUtils.javassist.sample.vector.VectorAssistant

All Implemented Interfaces:

Assistant

public class VectorAssistant
extends java.lang.Object
implements Assistant

This is a Javassist program which produce a new class representing vectors of a given type. For example,

import java.util.Vector by sample.vector.VectorAssistant(int)

requests the Javassist preprocessor to substitute the following lines for the original import declaration:

 import java.util.Vector;
 import sample.vector.intVector;
 

The Javassist preprocessor calls VectorAssistant.assist() and produces class intVector equivalent to:

 package sample.vector;

 public class intVector extends Vector {
   pubilc void add(int value) {
     addElement(new Integer(value));
   }

   public int affineTransform(int index) {
     return elementAt(index).intValue();
   }
 }
 

VectorAssistant.assist() uses sample.vector.Sample and sample.vector.Sample2 as a template to produce the methods add() and affineTransform().

Field Summary

java.lang.String

packageName

Constructor Summary

VectorAssistant()

Method Summary

CompileTimeClass[]	assist(ClassPool pool, java.lang.String vec, java.lang.String[] args) Calls makeSubclass() and produces a new vector class.
CompileTimeClass	makeSubclass(ClassPool pool, CompileTimeClass type) Produces a new vector class.
CompileTimeClass	makeSubclass2(ClassPool pool, CompileTimeClass type) Produces a new vector class.

Methods inherited from class java.lang.Object

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

Field Detail

packageName

public final java.lang.String packageName

See Also:

Constant Field Values

Constructor Detail

VectorAssistant

public VectorAssistant()

Method Detail

assist

public CompileTimeClass[] assist(ClassPool pool,
                                 java.lang.String vec,
                                 java.lang.String[] args)
                          throws CannotCompileException

Calls makeSubclass() and produces a new vector class. This method is called by a javassist.preproc.Compiler.

Specified by:

assist in interface Assistant

Parameters:

pool - class pool

vec - the class imported by the declaration

args - the parameters specified by the annotation

Returns:

the classes imported in the java source program produced by the preprocessor.

Throws:

CannotCompileException

See Also:

Compiler

makeSubclass

public CompileTimeClass makeSubclass(ClassPool pool,
                                     CompileTimeClass type)
                              throws CannotCompileException,
                                     NotFoundException,
                                     java.io.IOException

Produces a new vector class. This method does not work if the element type is a primitive type.

Parameters:

type - the type of elements

Throws:

CannotCompileException

NotFoundException

java.io.IOException

makeSubclass2

public CompileTimeClass makeSubclass2(ClassPool pool,
                                      CompileTimeClass type)
                               throws CannotCompileException,
                                      NotFoundException,
                                      java.io.IOException

Produces a new vector class. This uses wrapped methods so that the element type can be a primitive type.

Parameters:

type - the type of elements

Throws:

CannotCompileException

NotFoundException

java.io.IOException