    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.math3.util;
    018
    019    import org.apache.commons.math3.exception.MathIllegalArgumentException;
    020
    021    /**
    022     * Subclasses implementing this interface can transform Objects to doubles.
    023     * @version $Id: NumberTransformer.java 1416643 2012-12-03 19:37:14Z tn $
    024     *
    025     * No longer extends Serializable since 2.0
    026     *
    027     */
    028    public interface NumberTransformer {
    029
    030        /**
    031         * Implementing this interface provides a facility to transform
    032         * from Object to Double.
    033         *
    034         * @param o the Object to be transformed.
    035         * @return the double value of the Object.
    036         * @throws MathIllegalArgumentException if the Object can not be transformed into a Double.
    037         */
    038        double transform(Object o) throws MathIllegalArgumentException;
    039    }