org.deri.iris.builtins.string
Class StringSubstringBeforeWithoutCollationBuiltin

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

All Implemented Interfaces:

Comparable<IAtom>, IAtom, IBuiltinAtom

public class StringSubstringBeforeWithoutCollationBuiltin
extends FunctionalBuiltin

Represents the RIF built-in func:substring-before operation as described in http://www.w3.org/TR/xpath-functions/#func-substring-before. Restricts the value of collation to Unicode code point collation (http://www.w3.org/2005/xpath-functions/collation/codepoint).

Field Summary

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

EMPTY_TERM

Constructor Summary

StringSubstringBeforeWithoutCollationBuiltin(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

StringSubstringBeforeWithoutCollationBuiltin

public StringSubstringBeforeWithoutCollationBuiltin(ITerm... terms)

Constructor.

Parameters:

terms - The terms, where the term at the first position is the haystack, the term at the second position is the needle and the term at the last position represents the result. The haystack is the string being searched for the occurrence of the needle. The needle is the string to be searched for in the haystack.

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.