org.basex.query.xpath.internal
Class IndexMatch

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