org.basex.query.xpath.internal
Class IndexMatch

java.lang.Object
  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 2005-07, ISC License, Tim Petrowsky, Christian Gruen

Constructor Summary

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

Method Summary

NodeSet	eval(XPContext ctx) Evaluates the expression with the specified context set.
java.lang.String	toString()

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

compile, usesPos, usesSize

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

indexEquivalent, indexSizes, returnedValue, sameAs

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 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

toString

public java.lang.String toString()

Specified by:

toString in class Expr