org.basex.query.xquery.expr
Class If
java.lang.Object
org.basex.query.ExprInfo
org.basex.query.xquery.expr.Expr
org.basex.query.xquery.expr.Arr
org.basex.query.xquery.expr.If
public final class If
- extends Arr
FLWOR Clause.
- Author:
- Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen
Fields inherited from class org.basex.query.xquery.expr.Arr |
expr |
Method Summary |
Expr |
comp(XQContext ctx)
Optimizes and compiles the expression. |
Iter |
iter(XQContext ctx)
Evaluates the expression and returns an iterator on the resulting items. |
Type |
returned()
Indicates if an expression returns the specified type. |
java.lang.String |
toString()
|
Methods inherited from class org.basex.query.xquery.expr.Arr |
plan, uses |
Methods inherited from class org.basex.query.xquery.expr.Expr |
e, i |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
If
public If(Expr e,
Expr t,
Expr s)
- Constructor.
- Parameters:
e
- expressiont
- then clauses
- else clause
iter
public Iter iter(XQContext ctx)
throws XQException
- Description copied from class:
Expr
- Evaluates the expression and returns an iterator on the resulting items.
- Specified by:
iter
in class Expr
- Parameters:
ctx
- query context
- Returns:
- resulting item
- Throws:
XQException
- evaluation exception
comp
public Expr comp(XQContext ctx)
throws XQException
- Description copied from class:
Expr
- Optimizes and compiles the expression.
- Overrides:
comp
in class Arr
- Parameters:
ctx
- query context
- Returns:
- optimized Expression
- Throws:
XQException
- evaluation exception
returned
public Type returned()
- Description copied from class:
Expr
- Indicates if an expression returns the specified type.
Called by the compiler to check if expressions can be reformulated.
null is returned by default.
- Overrides:
returned
in class Arr
- Returns:
- result of check
toString
public java.lang.String toString()
- Specified by:
toString
in class ExprInfo