org.basex.query.xpath.expr
Class FTNot

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.xpath.expr.Expr
          org.basex.query.xpath.expr.FTArrayExpr
              org.basex.query.xpath.expr.FTNot

public final class FTNot
extends FTArrayExpr

Logical FTUnaryNot expression.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Sebastian Gath

Field Summary

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

fto

Constructor Summary

FTNot(FTArrayExpr e)
Constructor.

Method Summary

FTArrayExpr	comp(XPContext ctx) Optimizes the expression.
Bln	eval(XPContext ctx) Evaluates the expression with the specified context set.
FTArrayExpr	indexEquivalent(XPContext ctx, Step curr, boolean seq) Returns an equivalent expression which accesses an index structure.
boolean	indexOptions(MetaData meta) Verifies if the fulltext query options comply with the index defaults.
int	indexSizes(XPContext ctx, Step curr, int min) Returns the number of results if this query is evaluated by an index.

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

more, next, plan, pos, toString, usesPos, usesSize

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

returnedValue, sameAs

Methods inherited from class org.basex.query.ExprInfo

color, info, name

Methods inherited from class java.lang.Object

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

Constructor Detail

FTNot

public FTNot(FTArrayExpr e)

Constructor.

Parameters:

e - expressions

Method Detail

eval

public Bln eval(XPContext ctx)
         throws QueryException

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:

QueryException - evaluation exception

comp

public FTArrayExpr comp(XPContext ctx)
                 throws QueryException

Description copied from class: FTArrayExpr

Optimizes the expression.

Overrides:

comp in class FTArrayExpr

Parameters:

ctx - expression context

Returns:

optimized Expression

Throws:

QueryException - evaluation exception

indexOptions

public boolean indexOptions(MetaData meta)

Description copied from class: FTArrayExpr

Verifies if the fulltext query options comply with the index defaults. Check where this method is overwritten to get more info.

Overrides:

indexOptions in class FTArrayExpr

Parameters:

meta - meta data

Returns:

result of check

indexEquivalent

public FTArrayExpr indexEquivalent(XPContext ctx,
                                   Step curr,
                                   boolean seq)
                            throws QueryException

Description copied from class: Expr

Returns an equivalent expression which accesses an index structure.

Overrides:

indexEquivalent in class FTArrayExpr

Parameters:

ctx - root

curr - location step

seq - flag for sequential evaluation

Returns:

Equivalent index-expression or null

Throws:

QueryException - evaluation exception

indexSizes

public int indexSizes(XPContext ctx,
                      Step curr,
                      int min)

Description copied from class: Expr

Returns the number of results if this query is evaluated by an index. If Integer.MAX_VALUE is returned, no index access is possible.

Overrides:

indexSizes in class Expr

Parameters:

ctx - root

curr - the current location step

min - current minimum index hits

Returns:

number of expected results