/*
* 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.functions.concrete;
import xxl.core.functions.AbstractFunction;
import xxl.core.relational.JavaType;
/**
* Functional programming style lambda function to extract the key of a given tuple.
*
* @author Marcus Pinnecke (pinnecke@mathematik.uni-marburg.de)
*
*/
@SuppressWarnings("serial")
public class PrimitivesGetKeyFunction extends AbstractFunction<Object, Object> {
private JavaType mJavaType;
public PrimitivesGetKeyFunction(JavaType type) {
mJavaType = type;
}
@SuppressWarnings("unchecked")
@Override
public Object invoke(Object argument) {
// Check if this realy works or if argument have to be cloned
return argument;
}
}