/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.nabla.store;

 import org.apache.commons.nabla.core.DifferentiationException;

 import org.apache.commons.nabla.core.UnivariateDerivative;

 import org.apache.commons.nabla.core.UnivariateDifferentiable;

 import org.apache.commons.nabla.core.UnivariateDifferentiator;

 /** Differentiator that fetches classes already differentiated by

  * {@link org.apache.commons.nabla.automatic.AutomaticDifferentiator}.

  * @see org.apache.commons.nabla.automatic.AutomaticDifferentiator

  */

 public class FetchDifferentiator implements UnivariateDifferentiator {

     /** {@inheritDoc} */

     public UnivariateDerivative differentiate(final UnivariateDifferentiable d)

         throws DifferentiationException {

         // TODO implement differentiation by fetching an already derived class

         return null;

     }

 }