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Java example source code file (EquationsMapper.java)

This example Java source code file (EquationsMapper.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

dimensionmismatchexception, equationsmapper, serializable

The EquationsMapper.java Java example source code

/*
 * 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.math3.ode;

import java.io.Serializable;

import org.apache.commons.math3.exception.DimensionMismatchException;

/**
 * Class mapping the part of a complete state or derivative that pertains
 * to a specific differential equation.
 * <p>
 * Instances of this class are guaranteed to be immutable.
 * </p>
 * @see SecondaryEquations
 * @since 3.0
 */
public class EquationsMapper implements Serializable {

    /** Serializable UID. */
    private static final long serialVersionUID = 20110925L;

    /** Index of the first equation element in complete state arrays. */
    private final int firstIndex;

    /** Dimension of the secondary state parameters. */
    private final int dimension;

    /** simple constructor.
     * @param firstIndex index of the first equation element in complete state arrays
     * @param dimension dimension of the secondary state parameters
     */
    public EquationsMapper(final int firstIndex, final int dimension) {
        this.firstIndex = firstIndex;
        this.dimension  = dimension;
    }

    /** Get the index of the first equation element in complete state arrays.
     * @return index of the first equation element in complete state arrays
     */
    public int getFirstIndex() {
        return firstIndex;
    }

    /** Get the dimension of the secondary state parameters.
     * @return dimension of the secondary state parameters
     */
    public int getDimension() {
        return dimension;
    }

    /** Extract equation data from a complete state or derivative array.
     * @param complete complete state or derivative array from which
     * equation data should be retrieved
     * @param equationData placeholder where to put equation data
     * @throws DimensionMismatchException if the dimension of the equation data does not
     * match the mapper dimension
     */
    public void extractEquationData(double[] complete, double[] equationData)
        throws DimensionMismatchException {
        if (equationData.length != dimension) {
            throw new DimensionMismatchException(equationData.length, dimension);
        }
        System.arraycopy(complete, firstIndex, equationData, 0, dimension);
    }

    /** Insert equation data into a complete state or derivative array.
     * @param equationData equation data to be inserted into the complete array
     * @param complete placeholder where to put equation data (only the
     * part corresponding to the equation will be overwritten)
     * @throws DimensionMismatchException if the dimension of the equation data does not
     * match the mapper dimension
     */
    public void insertEquationData(double[] equationData, double[] complete)
        throws DimensionMismatchException {
        if (equationData.length != dimension) {
            throw new DimensionMismatchException(equationData.length, dimension);
        }
        System.arraycopy(equationData, 0, complete, firstIndex, dimension);
    }

}

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