org.basex.query.xpath.internal
Class IndexMatch

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.xpath.expr.Expr
          org.basex.query.xpath.internal.InternalExpr
              org.basex.query.xpath.internal.IndexMatch

public final class IndexMatch
extends InternalExpr

This class is only internally used for index optimizations.

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Tim Petrowsky, Christian Gruen

Constructor Summary

IndexMatch(LocPath p, Expr exp, LocPath m)
Constructor.

Method Summary

java.lang.String	color() Returns a string description of the expression.
Nod	eval(XPContext ctx) Evaluates the expression with the specified context set.
void	plan(Serializer ser) Recursively sends the abstract syntax of this expression to the specified serializer.
java.lang.String	toString()

Methods inherited from class org.basex.query.xpath.internal.InternalExpr

comp, usesPos, usesSize

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

indexEquivalent, indexSizes, returnedValue, sameAs

Methods inherited from class org.basex.query.ExprInfo

info, name

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexMatch

public IndexMatch(LocPath p,
                  Expr exp,
                  LocPath m)

Constructor.

Parameters:

p - input path

exp - expression that uses the index

m - matching path

Method Detail

eval

public Nod 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.

Specified by:

plan in class ExprInfo

Parameters:

ser - serializer

Throws:

java.io.IOException - exception

color

public java.lang.String color()

Description copied from class: ExprInfo

Returns a string description of the expression. Contrary to the ExprInfo.toString() method, the current expressions aren't included in the output.

Overrides:

color in class ExprInfo

Returns:

result of check

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo