org.basex.query.xpath.expr
Class FTUnion

java.lang.Object
  org.basex.query.xpath.expr.Expr
      org.basex.query.xpath.expr.ArrayExpr
          org.basex.query.xpath.expr.FTUnion

public final class FTUnion
extends ArrayExpr

FTUnion Expression. This expresses the union of two FTContains results.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Sebastian Gath

Field Summary

Fields inherited from class org.basex.query.xpath.expr.ArrayExpr

exprs

Constructor Summary

FTUnion(Expr[] e)
Constructor.

Method Summary

static int[][]	calcualteFtOr(int[][] values1, int[][] values2) Builds an or-conjunction of values1 and values2.
Expr	compile(XPContext ctx) Tries to optimize the Expression.
NodeSet	eval(XPContext ctx) Evaluates the expression with the specified context set.

Methods inherited from class org.basex.query.xpath.expr.ArrayExpr

sameAs, toString, usesPos, usesSize

Methods inherited from class org.basex.query.xpath.expr.Expr

indexEquivalent, indexSizes, returnedValue

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

FTUnion

public FTUnion(Expr[] e)

Constructor.

Parameters:

e - operands joined with the union operator

Method Detail

calcualteFtOr

public static int[][] calcualteFtOr(int[][] values1,
                                    int[][] values2)

Builds an or-conjunction of values1 and values2.

Parameters:

values1 - input set

values2 - input set

Returns:

union set int[][]

compile

public Expr compile(XPContext ctx)
             throws EvalException

Description copied from class: Expr

Tries to optimize the Expression.

Specified by:

compile in class Expr

Parameters:

ctx - expression context

Returns:

optimized Expression

Throws:

EvalException - evaluation exception

eval

public NodeSet eval(XPContext ctx)
             throws EvalException

Description copied from class: Expr

Evaluates the expression with the specified context set. Additionally provides a context

Specified by:

eval in class Expr

Parameters:

ctx - query context

Returns:

resulting XPathValue

Throws:

EvalException - evaluation exception