/* XXL: The eXtensible and fleXible Library for data processing
Copyright (C) 2000-2011 Prof. Dr. Bernhard Seeger
Head of the Database Research Group
Department of Mathematics and Computer Science
University of Marburg
Germany
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; If not, see <http://www.gnu.org/licenses/>.
http://code.google.com/p/xxl/
*/
package xxl.core.relational.resultSets;
import java.sql.ResultSet;
import xxl.core.functions.Function;
/**
* This class is a wrapper for result sets with the intention to receive an
* instance of the VTI (Virtual Table Interface) in order to use the wrapped
* result set in a FROM clause of an SQL-J statement.
*
* <p><b>IMPORTANT:</b> the function SET_RESULTSET has to be defined before any
* call to a constructor, i.e. before using NEW VirtualTable() in a
* FROM-clause.</p>
*/
public class VirtualTable extends DecoratorResultSet {
/**
* A function taht is used to initialize the wrapped result set. This
* function has to be defined before any call to a constructor.
*/
public static Function<?, ? extends ResultSet> SET_RESULTSET = null;
/**
* Creates a Virtual Table when the function SET_RESULTSET has been set
* before calling this constructor. Otherwise a
* <code>NullPointerException</code> is thrown.
*/
public VirtualTable() {
super(SET_RESULTSET.invoke());
}
}