org.jenetics.prog.op

Class Program<T>

java.lang.Object

org.jenetics.prog.op.Program<T>

Type Parameters:

T - the argument type of the operation

All Implemented Interfaces:

Function<T[],T>, Supplier<Op<T>>, Op<T>

public class Program<T>
extends Object
implements Op<T>

This class composes a given operation tree to a new operation. which can serve as a sub program in an other operation tree.

Since:

3.9

Version:

3.9

Author:

Franz Wilhelmstötter

Constructor Summary

Constructors

Constructor and Description
Program(String name, Tree<? extends Op<T>,?> tree) Create a new program with the given name and the given operation tree.

Method Summary

Modifier and Type	Method and Description
T	apply(T[] args)
int	arity() Return the arity of the operation function.
static void	check(Tree<? extends Op<?>,?> program) Validates the given program tree.
T	eval(T... args) Convenient method, which lets you apply the program function without explicitly create a wrapper array.
static <T> T	eval(Tree<? extends Op<T>,?> tree, T... variables) Evaluates the given operation tree with the given variables.
String	name() Return the name of the operation.
static <A> TreeNode<Op<A>>	of(int depth, ISeq<? extends Op<A>> operations, ISeq<? extends Op<A>> terminals) Create a new program tree from the given (non) terminal operations with the desired depth.
String	toString()
static <A> TreeNode<Op<A>>	toTree(ISeq<? extends FlatTree<? extends Op<A>,?>> nodes, ISeq<? extends Op<A>> terminals) Creates a valid program tree from the given flattened sequence of op nodes.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jenetics.prog.op.Op

get, isTerminal, of

Methods inherited from interface java.util.function.Function

andThen, compose, identity

Constructor Detail

Program

public Program(String name,
               Tree<? extends Op<T>,?> tree)

Create a new program with the given name and the given operation tree. The arity of the program is calculated from the given operation tree and set to the maximal arity of the operations of the tree.

Parameters:

name - the program name

tree - the operation tree

Throws:

NullPointerException - if one of the given arguments is null

IllegalArgumentException - if the given operation tree is invalid, which means there is at least one node where the operation arity and the node child count differ.

Method Detail

name

public String name()

Description copied from interface: Op

Return the name of the operation.

Specified by:

name in interface Op<T>

Returns:

the name of the operation

arity

public int arity()

Description copied from interface: Op

Return the arity of the operation function. If the arity is zero, the operation is terminal operation.

Specified by:

arity in interface Op<T>

Returns:

the arity of the operation

apply

public T apply(T[] args)

Specified by:

apply in interface Function<T[],T>

eval

@SafeVarargs
public final T eval(T... args)

Convenient method, which lets you apply the program function without explicitly create a wrapper array.

Parameters:

args - the function arguments

Returns:

the evaluated value

Throws:

NullPointerException - if the given variable array is null

IllegalArgumentException - if the length of the arguments array is smaller than the program arity

See Also:

apply(Object[])

toString

public String toString()

Overrides:

toString in class Object

eval

@SafeVarargs
public static <T> T eval(Tree<? extends Op<T>,?> tree,
                                      T... variables)

Evaluates the given operation tree with the given variables.

Type Parameters:

T - the argument type

Parameters:

tree - the operation tree

variables - the input variables

Returns:

the result of the operation tree evaluation

Throws:

NullPointerException - if one of the arguments is null

IllegalArgumentException - if the length of the variable array is smaller than the program arity

check

public static void check(Tree<? extends Op<?>,?> program)

Validates the given program tree.

Parameters:

program - the program to validate

Throws:

NullPointerException - if the given program is null

IllegalArgumentException - if the given operation tree is invalid, which means there is at least one node where the operation arity and the node child count differ.

of

public static <A> TreeNode<Op<A>> of(int depth,
                                     ISeq<? extends Op<A>> operations,
                                     ISeq<? extends Op<A>> terminals)

Create a new program tree from the given (non) terminal operations with the desired depth. The created program tree is a full tree.

Type Parameters:

A - the operational type

Parameters:

depth - the desired depth of the program tree

operations - the list of non-terminal operations

terminals - the list of terminal operations

Returns:

a new program tree

Throws:

NullPointerException - if one of the given operations is null

IllegalArgumentException - if the given tree depth is smaller than zero

toTree

public static <A> TreeNode<Op<A>> toTree(ISeq<? extends FlatTree<? extends Op<A>,?>> nodes,
                                         ISeq<? extends Op<A>> terminals)

Creates a valid program tree from the given flattened sequence of op nodes. The given operations and termination nodes are used for repairing the program tree, if necessary.

Type Parameters:

A - the operation argument type

Parameters:

nodes - the flattened, possible corrupt, program tree

terminals - the usable non-terminal operation nodes to use for reparation

Returns:

a new valid program tree build from the flattened program tree

Throws:

NullPointerException - if one of the arguments is null

IllegalArgumentException - if the nodes sequence is empty