/*
 * 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.euclidean.threed;

import java.io.Serializable;

import org.apache.commons.math3.geometry.Space;
import org.apache.commons.math3.geometry.euclidean.twod.Euclidean2D;

This class implements a three-dimensional space.
Since:3.0
/** * This class implements a three-dimensional space. * @since 3.0 */
public class Euclidean3D implements Serializable, Space {
Serializable version identifier.
/** Serializable version identifier. */
private static final long serialVersionUID = 6249091865814886817L;
Private constructor for the singleton.
/** Private constructor for the singleton. */
private Euclidean3D() { }
Get the unique instance.
Returns:the unique instance
/** Get the unique instance. * @return the unique instance */
public static Euclidean3D getInstance() { return LazyHolder.INSTANCE; }
{@inheritDoc}
/** {@inheritDoc} */
public int getDimension() { return 3; }
{@inheritDoc}
/** {@inheritDoc} */
public Euclidean2D getSubSpace() { return Euclidean2D.getInstance(); } // CHECKSTYLE: stop HideUtilityClassConstructor
Holder for the instance.

We use here the Initialization On Demand Holder Idiom.

/** Holder for the instance. * <p>We use here the Initialization On Demand Holder Idiom.</p> */
private static class LazyHolder {
Cached field instance.
/** Cached field instance. */
private static final Euclidean3D INSTANCE = new Euclidean3D(); } // CHECKSTYLE: resume HideUtilityClassConstructor
Handle deserialization of the singleton.
Returns:the singleton instance
/** Handle deserialization of the singleton. * @return the singleton instance */
private Object readResolve() { // return the singleton instance return LazyHolder.INSTANCE; } }