/* 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.util.random;
/** This class provides an interface for wrapping different kinds of PRNGs
* (pseudo random number generator) for using them within xxl.
* A default implementation is given by
* {@link xxl.core.util.random.JavaContinuousRandomWrapper JavaContinuousRandomWrapper}
* using {@link java.util.Random java build-in} PRNG.<br>
* <b>Caution</b>:
* It is recommended not to use this PRNG cause of its lack of speed and
* quality.<br>
* Instead one can use the MersenneTwister PRNG provided by the java library
* colt (http://tilde-hoschek.home.cern.ch/~hoschek/colt/index.htm").
* An implementation of this interface for using them with the colt library could be found in
* the connectivty.colt package.
*
* @see java.util.Random
* @see xxl.core.util.random.JavaContinuousRandomWrapper
* @see xxl.core.util.random.JavaDiscreteRandomWrapper
* @see xxl.core.util.random.DiscreteRandomWrapper
*/
public interface ContinuousRandomWrapper {
/** Returns the next randomly distributed double value given by
* the wrapped PRNG.
* @return the next randomly distributed double value.
* @see java.util.Random
* @see xxl.core.util.random.JavaContinuousRandomWrapper
*/
public abstract double nextDouble();
}