content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Bar;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.BarPrime;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.Foo;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.TestOneofEquals;
  import protobuf_unittest.lite_equals_and_hash.LiteEqualsAndHash.TestRecursiveOneof;
  
  import junit.framework.TestCase;
  
  /**
   * Test generate equal and hash methods for the lite runtime.
   *
   * @author pbogle@google.com Phil Bogle
   */
  public class LiteEqualsAndHashTest extends TestCase {
  
    public void testEquals() throws Exception {
      // Since the generated equals and hashCode methods for lite messages are a
      // mostly complete subset of those for regular messages, we can mostly assume
      // that the generated methods are already thoroughly tested by the regular tests.
  
      // This test mostly just verifies is that a proto with
      // optimize_for = LITE_RUNTIME and java_generates_equals_and_hash_compiles
      // correctly when linked only against the lite library.
  
      // We do however do some basic testing to make sure that equals is actually
      // overridden to test for value equality rather than simple object equality.
  
      // Check that two identical objs are equal.
      Foo foo1a = Foo.newBuilder()
          .setValue(1)
          .addBar(Bar.newBuilder().setName("foo1"))
          .build();
      Foo foo1b = Foo.newBuilder()
          .setValue(1)
          .addBar(Bar.newBuilder().setName("foo1"))
          .build();
      Foo foo2 = Foo.newBuilder()
          .setValue(1)
          .addBar(Bar.newBuilder().setName("foo2"))
          .build();
  
      // Check that equals is doing value rather than object equality.
      assertEquals(foo1a, foo1b);
      assertEquals(foo1a.hashCode(), foo1b.hashCode());
  
      // Check that a diffeent object is not equal.
      assertFalse(foo1a.equals(foo2));
  
      // Check that two objects which have different types but the same field values are not
      // considered to be equal.
      Bar bar = Bar.newBuilder().setName("bar").build();
      BarPrime barPrime = BarPrime.newBuilder().setName("bar").build();
      assertFalse(bar.equals(barPrime));
    }
  
    public void testOneofEquals() throws Exception {
      TestOneofEquals.Builder builder = TestOneofEquals.newBuilder();
      TestOneofEquals message1 = builder.build();
      // Set message2's name field to default value. The two messages should be different when we
      // check with the oneof case.
      builder.setName("");
      TestOneofEquals message2 = builder.build();
      assertFalse(message1.equals(message2));
    }
  
    public void testEqualsAndHashCodeWithUnknownFields() throws InvalidProtocolBufferException {
      Foo fooWithOnlyValue = Foo.newBuilder()
          .setValue(1)
          .build();
  
      Foo fooWithValueAndExtension = fooWithOnlyValue.toBuilder()
          .setValue(1)
          .setExtension(Bar.fooExt, Bar.newBuilder()
              .setName("name")
              .build())
          .build();
  
      Foo fooWithValueAndUnknownFields = Foo.parseFrom(fooWithValueAndExtension.toByteArray());
  
      assertEqualsAndHashCodeAreFalse(fooWithOnlyValue, fooWithValueAndUnknownFields);
      assertEqualsAndHashCodeAreFalse(fooWithValueAndExtension, fooWithValueAndUnknownFields);
    }
  
    private void assertEqualsAndHashCodeAreFalse(Object o1, Object o2) {
      assertFalse(o1.equals(o2));
      assertFalse(o1.hashCode() == o2.hashCode());
    }
  
    public void testRecursiveHashcode() {
      // This tests that we don't infinite loop.
      TestRecursiveOneof.getDefaultInstance().hashCode();
    }
  }
  