org.basex.query.xpath.expr
Class FTUnion

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

public final class FTUnion
extends FTArrayExpr

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

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

FTUnion(FTArrayExpr[] e)
Constructor.

FTUnion(FTArrayExpr[] e, int[] posex)
Constructor.

Method Summary

Bln	eval(XPContext ctx) Evaluates the expression with the specified context set.
boolean	more() Checks for more results.
FTNode	next(XPContext ctx) Returns the next ftquery result.
void	plan(Serializer ser) Recursively sends the abstract syntax of this expression to the specified serializer.

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

comp, indexEquivalent, indexOptions, pos, toString, usesPos, usesSize

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

indexSizes, 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

FTUnion

public FTUnion(FTArrayExpr[] e)

Constructor.

Parameters:

e - operands joined with the union operator

FTUnion

public FTUnion(FTArrayExpr[] e,
               int[] posex)

Constructor.

Parameters:

e - operands joined with the union operator

posex - pointer on exprs with positiv values

Method Detail

more

public boolean more()

Description copied from class: FTArrayExpr

Checks for more results.

Overrides:

more in class FTArrayExpr

Returns:

boolean

next

public FTNode next(XPContext ctx)

Description copied from class: FTArrayExpr

Returns the next ftquery result.

Overrides:

next in class FTArrayExpr

Parameters:

ctx - current context

Returns:

FTNode container for the next result

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

plan

public void plan(Serializer ser)
          throws java.io.IOException

Description copied from class: ExprInfo

Recursively sends the abstract syntax of this expression to the specified serializer.

Overrides:

plan in class FTArrayExpr

Parameters:

ser - serializer

Throws:

java.io.IOException - exception