org.basex.query.xquery.expr
Class Ord

java.lang.Object
  org.basex.query.xquery.expr.Expr
      org.basex.query.xquery.expr.Ord

public final class Ord
extends Expr

Single order specifier.

Author:

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

Field Summary

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

type

Constructor Summary

Ord()
Empty constructor for stable sorting.

Ord(Expr e, boolean d, boolean l, Item c)
Constructor.

Method Summary

Ord	comp(XQContext ctx) Optimizes and compiles the expression tree.
Item	eval(XQContext ctx) Evaluates the expression and returns the resulting item.
void	finish() Resets the built sequence.
java.lang.String	info() Returns a string description of the expression.
Item	item(int i) Returns the specified item.
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

Ord

public Ord()

Empty constructor for stable sorting.

Ord

public Ord(Expr e,
           boolean d,
           boolean l,
           Item c)

Constructor.

Parameters:

e - expression

d - descending order

l - least empty order

c - collation

Method Detail

comp

public Ord comp(XQContext ctx)
         throws XQException

Description copied from class: Expr

Optimizes and compiles the expression tree.

Specified by:

comp in class Expr

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

finish

public void finish()

Resets the built sequence.

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

item

public Item item(int i)

Returns the specified item.

Parameters:

i - item index

Returns:

item

toString

public java.lang.String toString()

Specified by:

toString in class Expr