org.deri.iris.builtins.string
Class StringConcatBuiltin

java.lang.Object
  org.deri.iris.builtins.AbstractBuiltin
      org.deri.iris.builtins.FunctionalBuiltin
          org.deri.iris.builtins.string.StringConcatBuiltin

All Implemented Interfaces:

Comparable<IAtom>, IAtom, IBuiltinAtom

public class StringConcatBuiltin
extends FunctionalBuiltin

Represents the RIF built-in func:concat as defined in http://www.w3.org/2005 /rules/wiki/DTB#func:concat_.28adapted_from_fn:concat.29.

Field Summary

Fields inherited from class org.deri.iris.builtins.AbstractBuiltin

EMPTY_TERM

Constructor Summary

StringConcatBuiltin(ITerm... terms)
Constructor.

Method Summary

protected ITerm

computeResult(ITerm[] terms) Computes the result when all terms but the term at the last position are known.

Methods inherited from class org.deri.iris.builtins.FunctionalBuiltin

evaluateTerms, maxUnknownVariables, testForEquality

Methods inherited from class org.deri.iris.builtins.AbstractBuiltin

compareTo, equals, evaluate, getPredicate, getTuple, hashCode, isBuiltin, isGround, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

StringConcatBuiltin

public StringConcatBuiltin(ITerm... terms)

Constructor. Three terms must be passed to the constructor, otherwise an exception will be thrown.

Parameters:

terms - The terms.

Throws:

IllegalArgumentException - If one of the terms is null.

IllegalArgumentException - If the number of terms submitted is not 3.

IllegalArgumentException - If terms is null.

Method Detail

computeResult

protected ITerm computeResult(ITerm[] terms)
                       throws EvaluationException

Description copied from class: FunctionalBuiltin

Computes the result when all terms but the term at the last position are known.

Specified by:

computeResult in class FunctionalBuiltin

Parameters:

terms - The terms, where the terms at the last position is a variable representing the result.

Returns:

The computed term, or null if the operation is unsuccessful.

Throws:

EvaluationException - If an error occurs.