org.basex.query.xpath.expr
Class FTNot

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