org.deri.iris.builtins.string
Class StringStartsWithBuiltin

java.lang.Object
  org.deri.iris.builtins.AbstractBuiltin
      org.deri.iris.builtins.BooleanBuiltin
          org.deri.iris.builtins.string.StringStartsWithBuiltin

All Implemented Interfaces:

Comparable<IAtom>, IAtom, IBuiltinAtom

public class StringStartsWithBuiltin
extends BooleanBuiltin

Represents the RIF built-in func:starts-with as described in http://www.w3.org/TR/xpath-functions/#func-starts-with. 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

StringStartsWithBuiltin(ITerm... terms)
Constructor.

Method Summary

protected boolean	computeResult(ITerm[] terms) Compute the result of the comparison.
static boolean	startsWith(String haystack, String needle, String collation)

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

evaluateTerms

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

StringStartsWithBuiltin

public StringStartsWithBuiltin(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 third position is the collation to be used. 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 boolean computeResult(ITerm[] terms)

Description copied from class: BooleanBuiltin

Compute the result of the comparison.

Specified by:

computeResult in class BooleanBuiltin

Parameters:

terms - The terms

Returns:

The result of the comparison.

startsWith

public static boolean startsWith(String haystack,
                                 String needle,
                                 String collation)