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    1   /*
    2    * Copyright 2003-2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package org.apache.commons.math.util;
    17
    18  import org.apache.commons.math.MathException;
    19
    20  /***
    21   * Subclasses implementing this interface can transform Objects to doubles.
    22   * @version $Revision: 1.11 $ $Date: 2004/06/23 16:26:15 $
    23   */
    24  public interface NumberTransformer {
    25
    26      /***
    27       * Implementing this interface provides a facility to transform
    28       * from Object to Double.
    29       *
    30       * @param o the Object to be transformed.
    31       * @return the double value of the Object.
    32       * @throws MathException if the Object can not be transformed into a Double.
    33       */
    34      double transform(Object o) throws MathException;
    35  }