org.basex.query.expr
Class List

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.expr.Expr
          org.basex.query.expr.Arr
              org.basex.query.expr.List

public final class List
extends Arr

Expression list.

Author:

Workgroup DBIS, University of Konstanz 2005-10, ISC License, Christian Gruen

Nested Class Summary

Nested classes/interfaces inherited from class org.basex.query.expr.Expr

Expr.Use

Field Summary

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

expr

Constructor Summary

List(Expr... l)
Constructor.

Method Summary

Expr	comp(QueryContext ctx) Optimizes and compiles the expression.
boolean	duplicates(QueryContext ctx) Returns true if the expression might yield duplicates and unsorted results.
Iter	iter(QueryContext ctx) Evaluates the expression and returns an iterator on the resulting items.
long	size(QueryContext ctx) Returns the sequence size or 1.
String	toString()

Methods inherited from class org.basex.query.expr.Arr

indexEquivalent, plan, removable, remove, uses

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

addText, atomic, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, returned, sameAs, test, v

Methods inherited from class org.basex.query.ExprInfo

color, info, name

Methods inherited from class java.lang.Object

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

Constructor Detail

List

public List(Expr... l)

Constructor.

Parameters:

l - expression list

Method Detail

comp

public Expr comp(QueryContext ctx)
          throws QueryException

Description copied from class: Expr

Optimizes and compiles the expression.

Overrides:

comp in class Arr

Parameters:

ctx - query context

Returns:

optimized Expression

Throws:

QueryException - query exception

iter

public Iter iter(QueryContext ctx)

Description copied from class: Expr

Evaluates the expression and returns an iterator on the resulting items. If this method is not overwritten, Expr.atomic(org.basex.query.QueryContext) must be implemented.

Overrides:

iter in class Expr

Parameters:

ctx - query context

Returns:

resulting item

size

public long size(QueryContext ctx)
          throws QueryException

Description copied from class: Expr

Returns the sequence size or 1.

Overrides:

size in class Expr

Parameters:

ctx - query context

Returns:

result of check

Throws:

QueryException - query exception

duplicates

public boolean duplicates(QueryContext ctx)

Description copied from class: Expr

Returns true if the expression might yield duplicates and unsorted results.

Overrides:

duplicates in class Arr

Parameters:

ctx - query context

Returns:

result of check

toString

public String toString()

Specified by:

toString in class ExprInfo