/* 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.math.queries;
/**
* This interface provides the support for the estimation of point queries respectively
* the association of a numerical value with a <tt>point query<tt>.
* A <tt>point query</tt> is performed on categorical data over a nominal scale,
* i.e., additional information of the data is not required. As an estimation of
* the <tt>point query<\tt>, a double value is returned.
*
* @see xxl.core.math.queries.WindowQuery
* @see xxl.core.math.queries.RangeQuery
*/
public interface PointQuery {
/** Performs an estimation of the given <tt>point query</tt>.
*
* @param query point query to process
* @return a numerical value delivering an estimation of the point query
*/
public abstract double pointQuery(Object query);
}