Package jason.stdlib

Class namespace_get_prop

java.lang.Object

jason.asSemantics.DefaultInternalAction

jason.stdlib.namespace_get_prop

All Implemented Interfaces:

InternalAction, Serializable

public class namespace_get_prop
extends DefaultInternalAction

Internal action: .namespace_get_prop.

Description: gets a property for a namespace.

Parameter:

• + arg[0] (atom): the namespace id.
  
• + arg[1] (atom): the key.
  
• - arg[2] (var or term): the value.
  
• + (optional) arg[3] (term): default value if key does not exit.
  

Example:

• .namespace_get_prop(family,uri,X): X unifies with the value for key uri; internal action fails if no such key.
• .namespace_get_prop(family,uri,X,"http://x.com"): X unifies with the value for key uri; unifies with "http://x.com" if no key.
• .namespace_get_prop(family,K): unifies K with any property key (backtracks for all keys).
• .namespace_get_prop(family,K,V): unifies K with any property jey and its value V.

See Also:

• namespace
• namespace_set_prop
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
namespace_get_prop()

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

namespace_get_prop

public namespace_get_prop()

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