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 */ 017 018 package org.apache.commons.math3.geometry.euclidean.oned; 019 020 import java.io.Serializable; 021 022 import org.apache.commons.math3.exception.MathUnsupportedOperationException; 023 import org.apache.commons.math3.exception.util.LocalizedFormats; 024 import org.apache.commons.math3.geometry.Space; 025 026 /** 027 * This class implements a one-dimensional space. 028 * @version $Id: Euclidean1D.java 1416643 2012-12-03 19:37:14Z tn $ 029 * @since 3.0 030 */ 031 public class Euclidean1D implements Serializable, Space { 032 033 /** Serializable version identifier. */ 034 private static final long serialVersionUID = -1178039568877797126L; 035 036 /** Private constructor for the singleton. 037 */ 038 private Euclidean1D() { 039 } 040 041 /** Get the unique instance. 042 * @return the unique instance 043 */ 044 public static Euclidean1D getInstance() { 045 return LazyHolder.INSTANCE; 046 } 047 048 /** {@inheritDoc} */ 049 public int getDimension() { 050 return 1; 051 } 052 053 /** {@inheritDoc} 054 * <p> 055 * As the 1-dimension Euclidean space does not have proper sub-spaces, 056 * this method always throws a {@link MathUnsupportedOperationException} 057 * </p> 058 * @return nothing 059 * @throws MathUnsupportedOperationException in all cases 060 */ 061 public Space getSubSpace() throws MathUnsupportedOperationException { 062 throw new MathUnsupportedOperationException(LocalizedFormats.NOT_SUPPORTED_IN_DIMENSION_N, 1); 063 } 064 065 // CHECKSTYLE: stop HideUtilityClassConstructor 066 /** Holder for the instance. 067 * <p>We use here the Initialization On Demand Holder Idiom.</p> 068 */ 069 private static class LazyHolder { 070 /** Cached field instance. */ 071 private static final Euclidean1D INSTANCE = new Euclidean1D(); 072 } 073 // CHECKSTYLE: resume HideUtilityClassConstructor 074 075 /** Handle deserialization of the singleton. 076 * @return the singleton instance 077 */ 078 private Object readResolve() { 079 // return the singleton instance 080 return LazyHolder.INSTANCE; 081 } 082 083 }