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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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package org.apache.commons.math.util;
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import java.io.Serializable;
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import org.apache.commons.math.Field;
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* Representation of real numbers with arbitrary precision field.
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* This class is a singleton.
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* @version $Revision: 795912 $ $Date: 2009-07-20 12:51:09 -0400 (Mon, 20 Jul 2009) $
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public class BigRealField implements Field<BigReal>, Serializable {
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/** Serializable version identifier */
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private static final long serialVersionUID = 4756431066541037559L;
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/** Private constructor for the singleton.
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private BigRealField() {
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/** Get the unique instance.
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* @return the unique instance
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public static BigRealField getInstance() {
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return LazyHolder.INSTANCE;
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public BigReal getOne() {
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public BigReal getZero() {
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/** Holder for the instance.
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* <p>We use here the Initialization On Demand Holder Idiom.</p>
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private static class LazyHolder {
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/** Cached field instance. */
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private static final BigRealField INSTANCE = new BigRealField();
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/** Handle deserialization of the singleton.
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* @return the singleton instance
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private Object readResolve() {
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// return the singleton instance
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return LazyHolder.INSTANCE;