001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.commons.nabla.caching;
018    
019    import org.apache.commons.math3.analysis.UnivariateVectorFunction;
020    import org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableVectorFunction;
021    import org.apache.commons.math3.analysis.differentiation.UnivariateVectorFunctionDifferentiator;
022    
023    /** Differentiator that fetches classes already differentiated by
024     * {@link org.apache.commons.nabla.forward.ForwardModeDifferentiator}.
025     * @see org.apache.commons.nabla.forward.ForwardModeDifferentiator
026     * @version $Id$
027     */
028    public class FetchDifferentiator implements UnivariateVectorFunctionDifferentiator {
029    
030        /** {@inheritDoc} */
031        public UnivariateDifferentiableVectorFunction differentiate(final UnivariateVectorFunction function) {
032    
033            // TODO: implement differentiation by fetching an already derived class
034            return null;
035    
036        }
037    
038    }