org.basex.query.xpath.expr
Class Comparison

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

Direct Known Subclasses:

Equality, FTContains, Relational

public abstract class Comparison
extends DualExpr

Abstract Compare Expression.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Christian Gruen

Field Summary

Comp	type Expression Type.

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

expr1, expr2

Constructor Summary

Comparison()

Method Summary

Bool	eval(XPContext ctx) Evaluates the expression with the specified context set.
boolean	simple() Checks if this equality expression is a simple one (LocationPath + XPathValue and equals check), accessing the indexes.
java.lang.String	toString()

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

usesPos, usesSize

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

compile, indexEquivalent, indexSizes, returnedValue, sameAs

Methods inherited from class java.lang.Object

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

Field Detail

type

public Comp type

Expression Type.

Constructor Detail

Comparison

public Comparison()

Method Detail

eval

public Bool 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

simple

public final boolean simple()

Checks if this equality expression is a simple one (LocationPath + XPathValue and equals check), accessing the indexes.

Returns:

result of check

toString

public final java.lang.String toString()

Specified by:

toString in class Expr