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 classes/interfaces inherited from class org.basex.query.expr.Expr |
Expr.Use |
Fields inherited from class org.basex.query.expr.Arr |
expr |
Constructor Summary |
List(Expr... l)
Constructor. |
Methods inherited from class org.basex.query.expr.Expr |
addText, atomic, checkCtx, checkDbl, checkItr, e, ebv, i, indexAccessible, returned, sameAs, test, v |
List
public List(Expr... l)
- Constructor.
- Parameters:
l
- expression list
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