handle serialization of BigFractionField (which is a singleton) properly and test it

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@795908 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Luc Maisonobe 2009-07-20 16:42:55 +00:00
parent 9c7a059486
commit fbd46106cb
2 changed files with 52 additions and 2 deletions

View File

@ -31,8 +31,6 @@ import org.apache.commons.math.Field;
* @since 2.0 * @since 2.0
*/ */
public class BigFractionField implements Field<BigFraction>, Serializable { public class BigFractionField implements Field<BigFraction>, Serializable {
// TODO: Add Serializable documentation
// TODO: Check Serializable implementation
/** Serializable version identifier */ /** Serializable version identifier */
private static final long serialVersionUID = -1699294557189741703L; private static final long serialVersionUID = -1699294557189741703L;
@ -67,4 +65,12 @@ public class BigFractionField implements Field<BigFraction>, Serializable {
private static final BigFractionField INSTANCE = new BigFractionField(); private static final BigFractionField INSTANCE = new BigFractionField();
} }
/** Handle deserialization of the singleton.
* @return the singleton instance
*/
private Object readResolve() {
// return the singleton instance
return LazyHolder.INSTANCE;
}
} }

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@ -0,0 +1,44 @@
/*
* 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.math.fraction;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.apache.commons.math.TestUtils;
import org.junit.Test;
public class BigFractionFieldTest {
@Test
public void testZero() {
assertEquals(BigFraction.ZERO, BigFractionField.getInstance().getZero());
}
@Test
public void testOne() {
assertEquals(BigFraction.ONE, BigFractionField.getInstance().getOne());
}
@Test
public void testSerial() {
// deserializing the singleton should give the singleton itself back
BigFractionField field = BigFractionField.getInstance();
assertTrue(field == TestUtils.serializeAndRecover(field));
}
}