org.basex.query.xquery.expr
Class Pred

java.lang.Object
  org.basex.query.xquery.expr.Expr
      org.basex.query.xquery.expr.Arr
          org.basex.query.xquery.expr.Pred

public final class Pred
extends Arr

Predicate expression.

Author:

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

Field Summary

Fields inherited from class org.basex.query.xquery.expr.Arr

list

Fields inherited from class org.basex.query.xquery.expr.Expr

type

Constructor Summary

Pred(Expr e, Expr[] p)
Constructor.

Method Summary

Expr	comp(XQContext ctx) Optimizes and compiles the expression tree.
Item	eval(XQContext ctx) Evaluates the expression and returns the resulting item.
java.lang.String	info() Returns a string description of the expression.
java.lang.String	toString()

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

cls, d, e, i, n, node, s, size, str, u

Methods inherited from class java.lang.Object

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

Constructor Detail

Pred

public Pred(Expr e,
            Expr[] p)

Constructor.

Parameters:

e - expression

p - predicate

Method Detail

comp

public Expr comp(XQContext ctx)
          throws XQException

Description copied from class: Expr

Optimizes and compiles the expression tree.

Overrides:

comp in class Arr

Parameters:

ctx - query context

Returns:

optimized Expression

Throws:

XQException - evaluation exception

eval

public Item eval(XQContext ctx)
          throws XQException

Description copied from class: Expr

Evaluates the expression and returns the resulting item.

Specified by:

eval in class Expr

Parameters:

ctx - query context

Returns:

resulting item

Throws:

XQException - evaluation exception

info

public java.lang.String info()

Description copied from class: Expr

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

Specified by:

info in class Expr

Returns:

result of check

toString

public java.lang.String toString()

Specified by:

toString in class Expr