org.deri.iris.builtins.string
Class StringSubstringAfterBuiltin

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

All Implemented Interfaces:

Comparable<IAtom>, IAtom, IBuiltinAtom

public class StringSubstringAfterBuiltin
extends FunctionalBuiltin

Represents the RIF built-in func:substring-after as described in http://www.w3.org/TR/xpath-functions/#func-substring-after. At the moment only Unicode code point collation (http://www.w3.org/2005/xpath-functions/collation/codepoint) is supported.

Field Summary

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

EMPTY_TERM

Constructor Summary

StringSubstringAfterBuiltin(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.
static String	substring(String haystack, String needle, String collation)

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

StringSubstringAfterBuiltin

public StringSubstringAfterBuiltin(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, the term at the third position is the collation 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.

substring

public static String substring(String haystack,
                               String needle,
                               String collation)