jef.mixers.impl.simpleMixer
Class DnaSimpleMixer

java.lang.Object
  jef.mixers.impl.simpleMixer.DnaSimpleMixer

All Implemented Interfaces:

DnaMixer

public class DnaSimpleMixer
extends java.lang.Object
implements DnaMixer

This class is in charge of performing a simple mix of two given Dna instances. This task is accomplished by generating a new Dna instance consisiting of the methods exposed by both the supplied Dnas. This simple Dna Mixer only appends methods exposed by the second parameter to the ones exposed by the first one.

Author:

Francesco Russo

Field Summary

protected Dna	dnaX
protected Dna	dnaY

Constructor Summary

DnaSimpleMixer()
The default constructor.

Method Summary

protected int	findThisClassType(Dna dna, int thisIndex) This method returns the index of the constant pool table entry containing the ConstantUTF8 structure representing the type of the class associated with the Dna parameter.
protected int	findThisReference(ConstantPoolTable cpt)
Dna	mix() This method mixes the two Dna instances passed to the contructor and returns a new one exposing a set of methods equals to the union of the ones exposed by both the Dna instances above.
protected ConstantPoolTable	reorganizeIndexes(ConstantPoolTable cpt, int offset) This method reorganizes all the references within a constant pool table in a way that all of them get shifted by the given offset.
protected void	setAccessFlags(Dna dna, Dna dnaX, Dna dnaY) This methodo sets the right access flags to the new generated class file.
protected void	setConstantPoolTable(Dna newDna, ConstantPoolTable xCPT, ConstantPoolTable yCPT) newDna's constant pool table will be the union of xDna's and yDna's constant pool tables.
void	setDnas(Dna dnaX, Dna dnaY) This method sets the two Dna instances that will be used for generating the new one.
protected void	setFields(Dna dna, Dna xDna, Dna yDna, int thisEntry, int fqnEntry) The new dna instance will have, as fields, the union of xDna's and yDna's fields.
protected void	setMethods(Dna dna, Dna dnaX, Dna dnaY, int thisEntry, int fqnEntry) The new dna instance will have, as methods, the union of xDna's and yDna's methods.
protected void	setMinorMajorNumber(Dna dna, Dna dnaA, Dna dnaB) This method sets the values of the major and minor number for the new Dna instance.
protected void	setSuperClass(Dna dna, Dna dnaX)
protected void	setThis(Dna dna, Dna dnaX)
protected void	updateConstantClassInfoRefs(ConstantPoolTable cpt, java.lang.String fqClassName, int newFqnIndx) This method reorganizes the given constant pool table in a way that all the Constant Class Info structures pointing to a Constant UTF8 entry having a value equal to , will point to the constant pool table entry specified by the third input parameter newFqnIndx.

Methods inherited from class java.lang.Object

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

Field Detail

dnaX

protected Dna dnaX

dnaY

protected Dna dnaY

Constructor Detail

DnaSimpleMixer

public DnaSimpleMixer()
               throws InstantiatorException

The default constructor.

Throws:

InstantiatorException

Method Detail

setDnas

public void setDnas(Dna dnaX,
                    Dna dnaY)

This method sets the two Dna instances that will be used for generating the new one.

Specified by:

setDnas in interface DnaMixer

Parameters:

dnaX - The first Dna instance.

dnaY - The second Dna instance

mix

public Dna mix()
        throws InstantiatorException,
               MixerException

This method mixes the two Dna instances passed to the contructor and returns a new one exposing a set of methods equals to the union of the ones exposed by both the Dna instances above.

Specified by:

mix in interface DnaMixer

Returns:

The new Dna instance exposing all the methods of the two Dna instances passed to the constructor.

Throws:

InstantiatorException

MixerException

setMinorMajorNumber

protected void setMinorMajorNumber(Dna dna,
                                   Dna dnaA,
                                   Dna dnaB)

This method sets the values of the major and minor number for the new Dna instance. Should xDna's maj. number be greater then yDna's maj. number, new maj. and minor number will correspond to the xDna's ones.

setConstantPoolTable

protected void setConstantPoolTable(Dna newDna,
                                    ConstantPoolTable xCPT,
                                    ConstantPoolTable yCPT)
                             throws java.lang.CloneNotSupportedException

newDna's constant pool table will be the union of xDna's and yDna's constant pool tables. This method sets the constant pool count as well.

Throws:

java.lang.CloneNotSupportedException

updateConstantClassInfoRefs

protected void updateConstantClassInfoRefs(ConstantPoolTable cpt,
                                           java.lang.String fqClassName,
                                           int newFqnIndx)
                                    throws WrongReferenceInConstantPoolTableException

This method reorganizes the given constant pool table in a way that all the Constant Class Info structures pointing to a Constant UTF8 entry having a value equal to , will point to the constant pool table entry specified by the third input parameter newFqnIndx.

Parameters:

cpt - The constant pool table to work with

fqClassName - The old fully qualified name we want to look for and replace

newFqnIndx - The index of the new ConstantUTF8 entry in the given cpt, containing the new FQN we want to point to

Throws:

WrongReferenceInConstantPoolTableException

findThisReference

protected int findThisReference(ConstantPoolTable cpt)

findThisClassType

protected int findThisClassType(Dna dna,
                                int thisIndex)
                         throws WrongReferenceInConstantPoolTableException

This method returns the index of the constant pool table entry containing the ConstantUTF8 structure representing the type of the class associated with the Dna parameter.

Throws:

WrongReferenceInConstantPoolTableException

reorganizeIndexes

protected ConstantPoolTable reorganizeIndexes(ConstantPoolTable cpt,
                                              int offset)

This method reorganizes all the references within a constant pool table in a way that all of them get shifted by the given offset.

setAccessFlags

protected void setAccessFlags(Dna dna,
                              Dna dnaX,
                              Dna dnaY)

This methodo sets the right access flags to the new generated class file.

setThis

protected void setThis(Dna dna,
                       Dna dnaX)

setSuperClass

protected void setSuperClass(Dna dna,
                             Dna dnaX)

setFields

protected void setFields(Dna dna,
                         Dna xDna,
                         Dna yDna,
                         int thisEntry,
                         int fqnEntry)
                  throws java.lang.CloneNotSupportedException

The new dna instance will have, as fields, the union of xDna's and yDna's fields. This method sets the fields count entry too.

Throws:

java.lang.CloneNotSupportedException

setMethods

protected void setMethods(Dna dna,
                          Dna dnaX,
                          Dna dnaY,
                          int thisEntry,
                          int fqnEntry)
                   throws java.lang.CloneNotSupportedException

The new dna instance will have, as methods, the union of xDna's and yDna's methods. This method sets the methods count entry too.

Throws:

java.lang.CloneNotSupportedException