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Java example source code file (Sphere1D.java)

This example Java source code file (Sphere1D.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

instance, lazyholder, mathunsupportedoperationexception, nosubspaceexception, object, serializable, space, sphere1d

The Sphere1D.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.geometry.spherical.oned;

import java.io.Serializable;

import org.apache.commons.math3.exception.MathUnsupportedOperationException;
import org.apache.commons.math3.exception.util.LocalizedFormats;
import org.apache.commons.math3.geometry.Space;

/**
 * This class implements a one-dimensional sphere (i.e. a circle).
 * <p>
 * We use here the topologists definition of the 1-sphere (see
 * <a href="http://mathworld.wolfram.com/Sphere.html">Sphere on
 * MathWorld), i.e. the 1-sphere is the one-dimensional closed curve
 * defined in 2D as x<sup>2+y2=1.
 * </p>
 * @since 3.3
 */
public class Sphere1D implements Serializable, Space {

    /** Serializable version identifier. */
    private static final long serialVersionUID = 20131218L;

    /** Private constructor for the singleton.
     */
    private Sphere1D() {
    }

    /** Get the unique instance.
     * @return the unique instance
     */
    public static Sphere1D getInstance() {
        return LazyHolder.INSTANCE;
    }

    /** {@inheritDoc} */
    public int getDimension() {
        return 1;
    }

    /** {@inheritDoc}
     * <p>
     * As the 1-dimension sphere does not have proper sub-spaces,
     * this method always throws a {@link NoSubSpaceException}
     * </p>
     * @return nothing
     * @throws NoSubSpaceException in all cases
     */
    public Space getSubSpace() throws NoSubSpaceException {
        throw new NoSubSpaceException();
    }

    // CHECKSTYLE: stop HideUtilityClassConstructor
    /** Holder for the instance.
     * <p>We use here the Initialization On Demand Holder Idiom.

*/ private static class LazyHolder { /** Cached field instance. */ private static final Sphere1D INSTANCE = new Sphere1D(); } // CHECKSTYLE: resume HideUtilityClassConstructor /** Handle deserialization of the singleton. * @return the singleton instance */ private Object readResolve() { // return the singleton instance return LazyHolder.INSTANCE; } /** Specialized exception for inexistent sub-space. * <p> * This exception is thrown when attempting to get the sub-space of a one-dimensional space * </p> */ public static class NoSubSpaceException extends MathUnsupportedOperationException { /** Serializable UID. */ private static final long serialVersionUID = 20140225L; /** Simple constructor. */ public NoSubSpaceException() { super(LocalizedFormats.NOT_SUPPORTED_IN_DIMENSION_N, 1); } } }

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