Package jason.stdlib

Class length

java.lang.Object

jason.asSemantics.DefaultInternalAction

jason.stdlib.length

All Implemented Interfaces:

InternalAction, Serializable

@Manual(literal=".length(argument,length)",
        hint="gets the length of strings or lists",
        argsHint={"the term whose length is to be determined","the resulting length"},
        argsType={"string or list","number"},
        examples={".length(\"abc\",X): X unifies with 3",".length([a,b],X): X unifies with 2",".length(\"a\",2): false"},
        seeAlso={"jason.stdlib.concat","jason.stdlib.delete","jason.stdlib.member","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 length
extends DefaultInternalAction

Internal action: .length.

Description: gets the length of strings or lists.

Parameters:

• + argument (string or list): the term whose length is to be determined.
  
• +/- length (number).

Examples:

• .length("abc",X): X unifies with 3.
• .length([a,b],X): X unifies with 2.
• .length("a",2): false.

See Also:

• concat
• delete
• max
• member
• min
• sort
• nth
• sort
• reverse
• difference
• intersection
• union
• function version
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
length()

Method Summary

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

Methods inherited from class jason.asSemantics.DefaultInternalAction

canBeUsedInContext, checkArguments, destroy, prepareArguments, suspendIntention

Methods inherited from class java.lang.Object

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

Constructor Details

length

public length()

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

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

getSize

public static NumberTerm getSize(Term arg)