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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.complex;
import org.apache.commons.math3.Field;
import org.apache.commons.math3.FieldElement;
import java.io.Serializable;
/**
* Representation of the complex numbers field.
*
* <p>This class is a singleton.
*
* @see Complex
* @since 2.0
*/
public class ComplexField implements Field<Complex>, Serializable {
/** Serializable version identifier. */
private static final long serialVersionUID = -6130362688700788798L;
/** Private constructor for the singleton. */
private ComplexField() {}
/**
* Get the unique instance.
*
* @return the unique instance
*/
public static ComplexField getInstance() {
return LazyHolder.INSTANCE;
}
/** {@inheritDoc} */
public Complex getOne() {
return Complex.ONE;
}
/** {@inheritDoc} */
public Complex getZero() {
return Complex.ZERO;
}
/** {@inheritDoc} */
public Class<? extends FieldElement<Complex>> getRuntimeClass() {
return Complex.class;
}
// 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 ComplexField INSTANCE = new ComplexField();
}
// CHECKSTYLE: resume HideUtilityClassConstructor
/**
* Handle deserialization of the singleton.
*
* @return the singleton instance
*/
private Object readResolve() {
// return the singleton instance
return LazyHolder.INSTANCE;
}
}
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