Package jason.stdlib

Class member

java.lang.Object

jason.asSemantics.DefaultInternalAction

jason.stdlib.member

All Implemented Interfaces:

InternalAction, Serializable

@Manual(literal=".member(item,list)",
        hint="checks if a given term is in a list. If the term is a free variable, backtracks all possible values",
        argsHint={"the term to be checked","the list where the term should be in"},
        argsType={"term","list"},
        examples={".member(c,[a,b,c]): true",".member(3,[a,b,c]): false",".member(X,[a,b,c]): unifies X with any member of the list"},
        seeAlso={"jason.stdlib.concat","jason.stdlib.delete","jason.stdlib.length","jason.stdlib.sort","jason.stdlib.nth","jason.stdlib.max","jason.stdlib.min","jason.stdlib.reverse","jason.stdlib.difference","jason.stdlib.intersection","jason.stdlib.union"})
public class member
extends DefaultInternalAction

Internal action: .member(T,L).

Description: checks if some term T is in a list L. If T is a free variable, this internal action backtracks all possible values for T.

Parameters:

• +/- member (term): the term to be checked.
• + list (list): the list where the term should be in.

Examples:

• .member(c,[a,b,c]): true.
• .member(3,[a,b,c]): false.
• .member(X,[a,b,c]): unifies X with any member of the list.

See Also:

• concat
• length
• sort
• nth
• max
• min
• reverse
• difference
• intersection
• union
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
member()

Method Summary

Modifier and Type	Method	Description
protected void	checkArguments(Term[] args)
static InternalAction	create()
Object	execute(TransitionSystem ts, Unifier un, Term[] args)	Executes the internal action.
int	getMaxArgs()
int	getMinArgs()

Methods inherited from class jason.asSemantics.DefaultInternalAction

canBeUsedInContext, destroy, prepareArguments, suspendIntention

Methods inherited from class java.lang.Object

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

Constructor Details

member

public member()

Method Details

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 Object execute(TransitionSystem ts,
 Unifier un,
 Term[] args)
               throws 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:

Exception