jason.stdlib
Class prefix

java.lang.Object
  jason.asSemantics.DefaultInternalAction
      jason.stdlib.prefix

All Implemented Interfaces:

InternalAction, java.io.Serializable

public class prefix
extends DefaultInternalAction

Internal action: .prefix(P,L).

Description: checks if some list P is a prefix of list L. If P has free variables, this internal action backtracks all possible values for P.

Parameters:

• +/- prefix (list): the prefix to be checked.
• + list (list): the list where the prefix is from.

Examples:

• .prefix([a],[a,b,c]): true.
• .prefix([b,c],[a,b,c]): false.
• .prefix(X,[a,b,c]): unifies X with any prefix of the list, i.e., [a,b,c], [a,b], [a], and [] in this order; note that this is different from what its usual implementation in logic programming would result, where the various prefixes are returned in increasing lengths instead.

See Also:

concat, length, sort, nth, max, min, reverse, suffix, sublist, difference, intersection, union, Serialized Form

Constructor Summary

prefix()

Method Summary

protected void	checkArguments(Term[] args)
static InternalAction	create()
java.lang.Object	execute(TransitionSystem ts, Unifier un, Term[] args) Executes the internal action.
int	getMaxArgs()
int	getMinArgs()

Methods inherited from class jason.asSemantics.DefaultInternalAction

canBeUsedInContext, prepareArguments, suspendIntention

Methods inherited from class java.lang.Object

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

Constructor Detail

prefix

public prefix()

Method Detail

create

public static InternalAction create()

getMinArgs

public int getMinArgs()

Overrides:

getMinArgs in class DefaultInternalAction

getMaxArgs

public int getMaxArgs()

Overrides:

getMaxArgs in class DefaultInternalAction

checkArguments

protected void checkArguments(Term[] args)
                       throws JasonException

Overrides:

checkArguments in class DefaultInternalAction

Throws:

JasonException

execute

public java.lang.Object execute(TransitionSystem ts,
                                Unifier un,
                                Term[] args)
                         throws java.lang.Exception

Description copied from interface: InternalAction

Executes the internal action. It should return a Boolean or an Iterator. A true boolean return means that the IA was successfully executed. An Iterator result means that there is more than one answer for this IA (e.g. see member internal action).

Specified by:

execute in interface InternalAction

Overrides:

execute in class DefaultInternalAction

Throws:

java.lang.Exception