planner.graphPlan

Class Action

java.lang.Object

planner.graphPlan.GraphNodeObject

planner.graphPlan.Action

All Implemented Interfaces:

Comparable

public class Action
extends GraphNodeObject

Class containing an action that relies on and can effect the state of the world (i.e. relies on preconditions and asserts postconditions)

Author:

dtdavis

Nested Class Summary

Nested classes/interfaces inherited from class planner.graphPlan.GraphNodeObject

GraphNodeObject.ParameterPairs

Field Summary

Fields

Modifier and Type	Field and Description
protected planner.graphPlan.Action.ConditionList	postconditions List of literals that will be asserted upon completion of this action
protected planner.graphPlan.Action.ConditionList	preconditions List of literals that must be asserted before this action can be taken

Fields inherited from class planner.graphPlan.GraphNodeObject

name, parameters

Constructor Summary

Constructors

Constructor and Description
Action(String name, Literal[] preconditions, Literal[] postconditions) Creates a new instance of Action

Method Summary

Modifier and Type	Method and Description
void	addPostcondition(Literal postcon) Adds a postcondition to the list iff it is not already present
void	addPrecondition(Literal precon) Adds a precondition to the list iff it is not already present
Literal	getPostcondition(int index) Returns the specified precondition
Literal	getPrecondition(int index) Returns the specified precondition
boolean	match(GraphNodeObject l2) Compares this action against another and returns true if they are equivalent
protected static boolean	matchConditions(planner.graphPlan.Action.ConditionList list1, planner.graphPlan.Action.ConditionList list2) Compares two lists of postconditions or preconditions for equivalence
int	numPostconditions() Returns the number of postconditions for this action
int	numPreconditions() Returns the number of preconditions for this action
List<GraphNode>	preconditionsMet(LiteralLayer literals) Determines whether or not the preconditions for the action are met at a certain layer
String	toString() Converts the Action object to a String

Methods inherited from class planner.graphPlan.GraphNodeObject

addParameter, addParameter, addParameter, addParameter, compareTo, copyParameters, getName, getParameter, matchParams, numParameters, removeParameter

Methods inherited from class java.lang.Object

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

Field Detail

preconditions

protected planner.graphPlan.Action.ConditionList preconditions

List of literals that must be asserted before this action can be taken

postconditions

protected planner.graphPlan.Action.ConditionList postconditions

List of literals that will be asserted upon completion of this action

Constructor Detail

Action

public Action(String name,
              Literal[] preconditions,
              Literal[] postconditions)

Creates a new instance of Action

Parameters:

name - descriptor for this action

preconditions - world state literals that must be true to execute this action

postconditions - world state literals that will be true upon completion of this action

Method Detail

numPreconditions

public int numPreconditions()

Returns the number of preconditions for this action

Returns:

numPostconditions

public int numPostconditions()

Returns the number of postconditions for this action

Returns:

addPrecondition

public final void addPrecondition(Literal precon)

Adds a precondition to the list iff it is not already present

Parameters:

precon -

addPostcondition

public final void addPostcondition(Literal postcon)

Adds a postcondition to the list iff it is not already present

Parameters:

postcon -

getPrecondition

public Literal getPrecondition(int index)

Returns the specified precondition

Parameters:

index -

Returns:

getPostcondition

public Literal getPostcondition(int index)

Returns the specified precondition

Parameters:

index -

Returns:

preconditionsMet

public List<GraphNode> preconditionsMet(LiteralLayer literals)

Determines whether or not the preconditions for the action are met at a certain layer

Parameters:

literals - LiteralLayer of the graph that is being checked for precondition satisfaction

Returns:

ArrayList of precondition graph nodes from the layer of literals

match

public boolean match(GraphNodeObject l2)

Compares this action against another and returns true if they are equivalent

Specified by:

match in class GraphNodeObject

Parameters:

l2 -

Returns:

matchConditions

protected static boolean matchConditions(planner.graphPlan.Action.ConditionList list1,
                                         planner.graphPlan.Action.ConditionList list2)

Compares two lists of postconditions or preconditions for equivalence

Parameters:

list1 -

list2 -

Returns:

toString

public String toString()

Converts the Action object to a String

Overrides:

toString in class GraphNodeObject