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Java example source code file (SerializableTester.java)

This example Java source code file (SerializableTester.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

beta, equalstester, gwtcompatible, serializabletester, suppresswarnings

The SerializableTester.java Java example source code

/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed 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 com.google.common.testing;

import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtCompatible;

import junit.framework.Assert;
import junit.framework.AssertionFailedError;

/**
 * Tests serialization and deserialization of an object, optionally asserting
 * that the resulting object is equal to the original.
 *
 * <p>GWT warning: Under GWT, both methods simply returns their input,
 * as proper GWT serialization tests require more setup.  This no-op behavior
 * allows test authors to intersperse {@code SerializableTester} calls with
 * other, GWT-compatible tests.
 *
 *
 * @author Mike Bostock
 * @since 10.0
 */
@Beta
@GwtCompatible // but no-op!
public final class SerializableTester {
  private SerializableTester() {}

  /**
   * Serializes and deserializes the specified object.
   *
   * <p>GWT warning: Under GWT, this method simply returns its input, as
   * proper GWT serialization tests require more setup.  This no-op behavior
   * allows test authors to intersperse {@code SerializableTester} calls with
   * other, GWT-compatible tests.
   *
   * <p>Note that the specified object may not be known by the compiler to be a
   * {@link java.io.Serializable} instance, and is thus declared an
   * {@code Object}. For example, it might be declared as a {@code List}.
   *
   * @return the re-serialized object
   * @throws RuntimeException if the specified object was not successfully
   *     serialized or deserialized
   */
  @SuppressWarnings("unchecked")
  public static <T> T reserialize(T object) {
    return Platform.reserialize(object);
  }

  /**
   * Serializes and deserializes the specified object and verifies that the
   * re-serialized object is equal to the provided object, that the hashcodes
   * are identical, and that the class of the re-serialized object is identical
   * to that of the original.
   *
   * <p>GWT warning: Under GWT, this method simply returns its input, as
   * proper GWT serialization tests require more setup.  This no-op behavior
   * allows test authors to intersperse {@code SerializableTester} calls with
   * other, GWT-compatible tests.
   *
   * <p>Note that the specified object may not be known by the compiler to be a
   * {@link java.io.Serializable} instance, and is thus declared an
   * {@code Object}. For example, it might be declared as a {@code List}.
   *
   * <p>Note also that serialization is not in general required to return an
   * object that is {@linkplain Object#equals equal} to the original, nor is it
   * required to return even an object of the same class. For example, if
   * sublists of {@code MyList} instances were serializable, those sublists
   * might implement a private {@code MySubList} type but serialize as a plain
   * {@code MyList} to save space. So long as {@code MyList} has all the public
   * supertypes of {@code MySubList}, this is safe. For these cases, for which
   * {@code reserializeAndAssert} is too strict, use {@link #reserialize}.
   *
   * @return the re-serialized object
   * @throws RuntimeException if the specified object was not successfully
   *     serialized or deserialized
   * @throws AssertionFailedError if the re-serialized object is not equal to
   *     the original object, or if the hashcodes are different.
   */
  public static <T> T reserializeAndAssert(T object) {
    T copy = reserialize(object);
    new EqualsTester()
        .addEqualityGroup(object, copy)
        .testEquals();
    Assert.assertEquals(object.getClass(), copy.getClass());
    return copy;
  }
}

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