Package edu.uky.ai.planning

Class Problem

java.lang.Object

edu.uky.ai.planning.Problem

Direct Known Subclasses:

StateSpaceProblem

public class Problem
extends Object

A planning problem exists in some Domain and defines the initial state of the world and a goal to be achieved.

Author:

Stephen G. Ware

Field Summary

Fields

Modifier and Type	Field	Description
final Domain	domain	The domain in which this problem exists
final Proposition	goal	Some goal that needs to be achieved by any solution to this problem
final State	initial	The initial state of the world, which specifies the disposition of every object
final String	name	The name of the problem
final ImmutableArray<Constant>	objects	All the objects that exist in the world

Constructor Summary

Constructors

Constructor	Description
Problem(String name, Domain domain, Constant[] objects, State initial, Proposition goal)	Constructs a new problem.
Problem(String name, Domain domain, ImmutableArray<Constant> objects, State initial, Proposition goal)	Constructs a new problem.

Method Summary

Modifier and Type	Method	Description
Iterable<Constant>	getObjectsByType(String type)	Returns all the objects in the world which are of a given type.
int	hashCode()
boolean	isSolution(Plan plan)	Checks if a given plan is a solution to this problem.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

name

public final String name

The name of the problem

domain

public final Domain domain

The domain in which this problem exists

objects

public final ImmutableArray<Constant> objects

All the objects that exist in the world

initial

public final State initial

The initial state of the world, which specifies the disposition of every object

goal

public final Proposition goal

Some goal that needs to be achieved by any solution to this problem

Constructor Details

Problem

public Problem(String name,
 Domain domain,
 ImmutableArray<Constant> objects,
 State initial,
 Proposition goal)

Constructs a new problem.

Parameters:

name - the name of the problem

domain - the domain in which it exists

objects - the objects in the world

initial - the initial state

goal - the goal

Problem

public Problem(String name,
 Domain domain,
 Constant[] objects,
 State initial,
 Proposition goal)

Constructs a new problem.

Parameters:

name - the name of the problem

domain - the domain in which it exists

objects - the objects in the world

initial - the initial state

goal - the goal

Method Details

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isSolution

public boolean isSolution(Plan plan)

Checks if a given plan is a solution to this problem.

Parameters:

plan - the plan to test

Returns:

true if the plan is a solution to the problem, false otherwise

getObjectsByType

public Iterable<Constant> getObjectsByType(String type)

Returns all the objects in the world which are of a given type.

Parameters:

type - the type of objects to return

Returns:

the (possibly empty) set of objects

toString

public String toString()

Overrides:

toString in class Object