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/*
* 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.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 space.
* @since 3.0
*/
public class Euclidean1D implements Serializable, Space {
/** Serializable version identifier. */
private static final long serialVersionUID = -1178039568877797126L;
/** Private constructor for the singleton.
*/
private Euclidean1D() {
}
/** Get the unique instance.
* @return the unique instance
*/
public static Euclidean1D getInstance() {
return LazyHolder.INSTANCE;
}
/** {@inheritDoc} */
public int getDimension() {
return 1;
}
/** {@inheritDoc}
* <p>
* As the 1-dimension Euclidean space 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.</p>
*/
private static class LazyHolder {
/** Cached field instance. */
private static final Euclidean1D INSTANCE = new Euclidean1D();
}
// 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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