org.basex.query.xpath.expr
Class FTNotExprs

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

public final class FTNotExprs
extends ArrayExpr

FTNotExprs. This expresses the mild combination of ftand and ftnot. The selection A not in B matches a token sequence that matches a, but not when it is part of b.

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

FTNotExprs(Expr[] e)
Constructor.

Method Summary

Expr	compile(XPContext ctx) Tries to optimize the Expression.
static int[][]	determineNot(int[][] resultWordA, int[][] resultWordB) Each result wordA, is not allowed to be contained in result wordB.
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

FTNotExprs

public FTNotExprs(Expr[] e)

Constructor.

Parameters:

e - operands joined with the mild not operator

Method Detail

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

determineNot

public static int[][] determineNot(int[][] resultWordA,
                                   int[][] resultWordB)

Each result wordA, is not allowed to be contained in result wordB. each result for wordA, that is not contained in result set wordB, is added to returned result set.

Parameters:

resultWordA - result allowed to be contained

resultWordB - result not allowed to be contained

Returns:

data []

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