ec.gp

Class ADFContext

java.lang.Object

ec.gp.ADFContext

All Implemented Interfaces:

Prototype, Setup, Serializable, Cloneable

public class ADFContext
extends Object
implements Prototype

ADFContext is the object pushed onto an ADF stack which represents the current context of an ADM or ADF function call, that is, how to get the argument values that argument_terminals need to return.

adf contains the relevant ADF/ADM node. If it's an ADF function call, then arguments[] contains the evaluated arguments to the ADF. If it's an ADM function call, then arguments[] is set to false.

You set up the ADFContext object for a given ADF or ADM node with the prepareADF(...) and prepareADM(...) functions.

To evaluate an argument number from an ADFContext, call evaluate(...), and the results are evaluated and copied into input.

Version:

1.0

Author:

Sean Luke

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
ADF	adf The ADF/ADM node proper
GPData[]	arguments An array of GPData nodes (none of the null, when it's used) holding an ADF's arguments' return results
static String	P_ADFCONTEXT

Constructor Summary

Constructors

Constructor and Description
ADFContext()

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone() Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context.
Parameter	defaultBase() Returns the default base for this prototype.
void	evaluate(EvolutionState state, int thread, GPData input, ADFStack stack, GPIndividual individual, Problem problem, int argument) Evaluates the argument number in the current context
void	prepareADF(ADF a, GPProblem problem) Increases arguments to accommodate space if necessary.
void	prepareADM(ADM a) Sets adf to a
void	setup(EvolutionState state, Parameter base) Sets up the object by reading it from the parameters stored in state, built off of the parameter base base.

Methods inherited from class java.lang.Object

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

Field Detail

P_ADFCONTEXT

public static final String P_ADFCONTEXT

See Also:

Constant Field Values

adf

public ADF adf

The ADF/ADM node proper

arguments

public GPData[] arguments

An array of GPData nodes (none of the null, when it's used) holding an ADF's arguments' return results

Constructor Detail

ADFContext

public ADFContext()

Method Detail

defaultBase

public Parameter defaultBase()

Description copied from interface: Prototype

Returns the default base for this prototype. This should generally be implemented by building off of the static base() method on the DefaultsForm object for the prototype's package. This should be callable during setup(...).

Specified by:

defaultBase in interface Prototype

clone

public Object clone()

Description copied from interface: Prototype

Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context.

Typically this should be a full "deep" clone. However, you may share certain elements with other objects rather than clone hem, depending on the situation:

• If you hold objects which are shared with other instances, don't clone them.
• If you hold objects which must be unique, clone them.
• If you hold objects which were given to you as a gesture of kindness, and aren't owned by you, you probably shouldn't clone them.
• DON'T attempt to clone: Singletons, Cliques, or Groups.
• Arrays are not cloned automatically; you may need to clone an array if you're not sharing it with other instances. Arrays have the nice feature of being copyable by calling clone() on them.

Implementations.

• If no ancestor of yours implements clone(), and you have no need to do clone deeply, and you are abstract, then you should not declare clone().
• If no ancestor of yours implements clone(), and you have no need to do clone deeply, and you are not abstract, then you should implement it as follows:

   public Object clone() 
       {
       try
           { 
           return super.clone();
           }
       catch ((CloneNotSupportedException e)
           { throw new InternalError(); } // never happens
       }
          

• If no ancestor of yours implements clone(), but you need to deep-clone some things, then you should implement it as follows:

   public Object clone() 
       {
       try
           { 
           MyObject myobj = (MyObject) (super.clone());
  
           // put your deep-cloning code here...
           }
       catch ((CloneNotSupportedException e)
           { throw new InternalError(); } // never happens
       return myobj;
       } 
          

• If an ancestor has implemented clone(), and you also need to deep clone some things, then you should implement it as follows:

   public Object clone() 
       { 
       MyObject myobj = (MyObject) (super.clone());
  
       // put your deep-cloning code here...
  
       return myobj;
       } 
          

Specified by:

clone in interface Prototype

Overrides:

clone in class Object

setup

public void setup(EvolutionState state,
         Parameter base)

Description copied from interface: Prototype

Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. If an ancestor implements this method, be sure to call super.setup(state,base); before you do anything else.

For prototypes, setup(...) is typically called once for the prototype instance; cloned instances do not receive the setup(...) call. setup(...) may be called more than once; the only guarantee is that it will get called at least once on an instance or some "parent" object from which it was ultimately cloned.

Specified by:

setup in interface Prototype

Specified by:

setup in interface Setup

evaluate

public void evaluate(EvolutionState state,
            int thread,
            GPData input,
            ADFStack stack,
            GPIndividual individual,
            Problem problem,
            int argument)

Evaluates the argument number in the current context

prepareADF

public final void prepareADF(ADF a,
              GPProblem problem)

Increases arguments to accommodate space if necessary. Sets adf to a. You need to then fill out the arguments yourself.

prepareADM

public final void prepareADM(ADM a)

Sets adf to a