Package jason.stdlib

Class count

java.lang.Object

jason.asSemantics.DefaultInternalAction

jason.stdlib.count

All Implemented Interfaces:

InternalAction, Serializable

public class count
extends DefaultInternalAction

Internal action: .count.

Description: counts the number of occurrences of a particular belief (pattern) in the agent's belief base.

Parameters:

• + query (logical formula): the formula used to count literals in the belief base; is has the same syntax as the plan context.
  
• +/- quantity (number): the number of occurrences of the belief.
  

Examples:

• .count(a(2,_),N): counts the number of beliefs that unify with a(2,_); N unifies with this quantity.
• .count((a(2,X)invalid input: '&' X>10),N): counts the number of beliefs that unify with a(2,X) and X > 10; N unifies with this quantity.
• .count(a(2,_),5): succeeds if the BB has exactly 5 beliefs that unify with a(2,_).

See Also:

• findall
• setof
• namespace
• function version
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
count()

Method Summary

Modifier and Type	Method	Description
protected void	checkArguments(Term[] args)
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

count

public count()

Method Details

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