gap
Class GPFunction

java.lang.Object
  |
  +--gap.GPFunction

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable

Direct Known Subclasses:

GPTerminal

public abstract class GPFunction

extends java.lang.Object

implements java.lang.Cloneable, java.io.Serializable

This class represents a function in a program tree.

Author:

Pietro Berkes, Samuele Pedroni

See Also:

Serialized Form

Field Summary

GPFunction[]	arg Arguments of the function
Ref	father Reference to the father.
int	idx Index in the function set; set by GPProgram.
static int	NO_TYPE No information on the type.
static int	SPECIAL Special type: type information has to be found elsewhere.

Constructor Summary

GPFunction()

Method Summary

void	compile(jrgp.bytecoder0.Bytecoder coder, CompileContext ctxt) Do not try (to implement) this at home.
GPFunction	deepClone(GPProgram p, Ref father) Clone the function and all his arguments.
abstract float	exec(java.lang.Object o, float[] args) Execute the function with reference to an object and an array of arguments.
int[]	getCompatibility(int arg_no) Grammatical rules.
int	getNArgs() Return the number of arguments.
java.lang.String	getObjArgTypeName() Return the name of the object passed to the exec method.
int	getType() Return the type of the function, for grammatical purposes.
java.lang.String	prettyPrint(java.lang.String ident) Return a string representation of the function and its children.
java.lang.String	toString() Return the name of the function, extracted from the class name.

Methods inherited from class java.lang.Object

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

Field Detail

idx

public int idx

Index in the function set; set by GPProgram.

arg

public GPFunction[] arg

Arguments of the function

father

public Ref father

Reference to the father.

NO_TYPE

public static final int NO_TYPE

No information on the type.

SPECIAL

public static final int SPECIAL

Special type: type information has to be found elsewhere. For ADFs and arguments.

Constructor Detail

GPFunction

public GPFunction()

Method Detail

getType

public int getType()

Return the type of the function, for grammatical purposes.

getCompatibility

public int[] getCompatibility(int arg_no)

Grammatical rules. Each argument must accept at least one type of terminal.

Returns:

Array of types accepted from the argument #arg_no, null if all types accepted.

getNArgs

public int getNArgs()

Return the number of arguments.

exec

public abstract float exec(java.lang.Object o,
                           float[] args)

Execute the function with reference to an object and an array of arguments.

toString

public java.lang.String toString()

Return the name of the function, extracted from the class name.

Overrides:

toString in class java.lang.Object

prettyPrint

public java.lang.String prettyPrint(java.lang.String ident)

Return a string representation of the function and its children.

compile

public void compile(jrgp.bytecoder0.Bytecoder coder,
                    CompileContext ctxt)
             throws CompileFailureException

Do not try (to implement) this at home. OTOH fs-d can ;).

Default behaviour is to throw a CompileFailureException about missing compile support.
OTOH fs-d produces GPFunctions with the needed compile logic.

getObjArgTypeName

public java.lang.String getObjArgTypeName()

Return the name of the object passed to the exec method. For compilation purposes.

See Also:

exec(java.lang.Object, float[])

deepClone

public GPFunction deepClone(GPProgram p,
                            Ref father)

Clone the function and all his arguments.