org.basex.query.xpath.expr
Class Relational

java.lang.Object
  org.basex.query.xpath.expr.Expr
      org.basex.query.xpath.expr.DualExpr
          org.basex.query.xpath.expr.Comparison
              org.basex.query.xpath.expr.Relational

public final class Relational
extends Comparison

XPath Relational Expression. Can express: LESS (<) LESS_OR_EQUALS (<=) GREATER (>) GREATER_OR_EQUALS (>=)

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Tim Petrowsky

Field Summary

Fields inherited from class org.basex.query.xpath.expr.Comparison

type

Fields inherited from class org.basex.query.xpath.expr.DualExpr

expr1, expr2

Constructor Summary

Relational(Expr e1, Expr e2, Comp t)
Constructor.

Method Summary

Expr	compile(XPContext ctx) Tries to optimize the Expression.
boolean	sameAs(Expr cmp) Checks current and specified expression for equivalence.

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

eval, simple, toString

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

usesPos, usesSize

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

indexEquivalent, indexSizes, returnedValue

Methods inherited from class java.lang.Object

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

Constructor Detail

Relational

public Relational(Expr e1,
                  Expr e2,
                  Comp t)

Constructor.

Parameters:

e1 - first expression

e2 - second expression to be compared with

t - see class description

Method Detail

compile

public Expr compile(XPContext ctx)
             throws EvalException

Description copied from class: Expr

Tries to optimize the Expression.

Specified by:

compile in class Expr

Parameters:

ctx - expression context

Returns:

optimized Expression

Throws:

EvalException - evaluation exception

sameAs

public boolean sameAs(Expr cmp)

Description copied from class: Expr

Checks current and specified expression for equivalence.

Overrides:

sameAs in class Expr

Parameters:

cmp - expression to be compared

Returns:

result of check