org.deri.iris.builtins.string
Class StringSubstringBuiltin

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

All Implemented Interfaces:

Comparable<IAtom>, IAtom, IBuiltinAtom

public class StringSubstringBuiltin
extends FunctionalBuiltin

Represents a string substring operation.

Author:

gigi, Adrian Marte

Field Summary

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

EMPTY_TERM

Constructor Summary

StringSubstringBuiltin(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

StringSubstringBuiltin

public StringSubstringBuiltin(ITerm... terms)

Constructor.

Parameters:

terms - The terms, where the first term is the string, the second term is the begin index, the third term is the endIndex and the fourth term represents the result.

Throws:

IllegalArgumentException - if one of the 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.