Module org.apache.jena.core

Package org.apache.jena.reasoner.rulesys.builtins

Class IsDType

java.lang.Object

org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin

org.apache.jena.reasoner.rulesys.builtins.IsDType

All Implemented Interfaces:

Builtin

public class IsDType
extends BaseBuiltin

Tests whether the first argument is an instance of the datatype defined by the resource in the second argument.

Field Summary

Fields inherited from class org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin

BASE_URI

Constructor Summary

Constructors

Constructor	Description
IsDType()

Method Summary

Modifier and Type	Method	Description
boolean	bodyCall(Node[] args, int length, RuleContext context)	This method is invoked when the builtin is called in a rule body.
int	getArgLength()	Return the expected number of arguments for this functor or 0 if the number is flexible.
String	getName()	Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.
static boolean	isTypeOK(Node val, Node dt)	Check if a literal value node is a legal value for the given datatype.

Methods inherited from class org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin

checkArgs, getArg, getURI, headAction, isMonotonic, isSafe

Methods inherited from class java.lang.Object

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

Constructor Details

IsDType

public IsDType()

Method Details

getName

public String getName()

Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.

getArgLength

public int getArgLength()

Return the expected number of arguments for this functor or 0 if the number is flexible.

Specified by:

getArgLength in interface Builtin

Overrides:

getArgLength in class BaseBuiltin

bodyCall

public boolean bodyCall(Node[] args,
 int length,
 RuleContext context)

This method is invoked when the builtin is called in a rule body.

Specified by:

bodyCall in interface Builtin

Overrides:

bodyCall in class BaseBuiltin

Parameters:

args - the array of argument values for the builtin, this is an array of Nodes, some of which may be Node_RuleVariables.

length - the length of the argument list, may be less than the length of the args array for some rule engines

context - an execution context giving access to other relevant data

Returns:

return true if the buildin predicate is deemed to have succeeded in the current environment

isTypeOK

public static boolean isTypeOK(Node val,
 Node dt)

Check if a literal value node is a legal value for the given datatype.

Parameters:

val - the literal value node

dt - the Node designating a datatype URI