/* 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.predicates;
import xxl.core.functions.Projection;
/**
* This class provides a decorator predicate that applies a projection to the
* arguments of the underlying predicate. Everytime arguments are passed to the
* <code>invoke</code> method of this class, the arguments are first projected
* using a given projection and afterwards passed to the <code>invoke</code>
* method of the underlying predicate.
*
* @param <P> the type of the predicate's parameters.
* @see Projection
*/
public class ProjectionPredicate<P> extends FeaturePredicate<P[], P[]> {
/**
* Creates a new projection predicate that applies the specified projection
* to the arguments of it's <code>invoke</code> methods before the
* <code>invoke</code> method of the given predicate is called.
*
* @param predicate the predicate which input arguments should be mapped.
* @param projection the projection that is applied to the arguments of the
* wrapped predicate.
*/
public ProjectionPredicate(Predicate<P[]> predicate, Projection<P> projection) {
super(predicate, projection);
}
}