content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
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  // modification, are permitted provided that the following conditions are
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  // in the documentation and/or other materials provided with the
  // distribution.
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  //
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  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import protobuf_unittest.Vehicle;
  import protobuf_unittest.Wheel;
  import java.util.ArrayList;
  import java.util.List;
  import junit.framework.TestCase;
  
  /**
   * Test cases that exercise end-to-end use cases involving {@link SingleFieldBuilder} and {@link
   * RepeatedFieldBuilder}.
   *
   * @author jonp@google.com (Jon Perlow)
   */
  public class NestedBuildersTest extends TestCase {
  
    public void testMessagesAndBuilders() {
      Vehicle.Builder vehicleBuilder = Vehicle.newBuilder();
      vehicleBuilder.addWheelBuilder().setRadius(4).setWidth(1);
      vehicleBuilder.addWheelBuilder().setRadius(4).setWidth(2);
      vehicleBuilder.addWheelBuilder().setRadius(4).setWidth(3);
      vehicleBuilder.addWheelBuilder().setRadius(4).setWidth(4);
      vehicleBuilder.getEngineBuilder().setLiters(10);
  
      Vehicle vehicle = vehicleBuilder.build();
      assertEquals(4, vehicle.getWheelCount());
      for (int i = 0; i < 4; i++) {
        Wheel wheel = vehicle.getWheel(i);
        assertEquals(4, wheel.getRadius());
        assertEquals(i + 1, wheel.getWidth());
      }
      assertEquals(10, vehicle.getEngine().getLiters());
  
      for (int i = 0; i < 4; i++) {
        vehicleBuilder.getWheelBuilder(i).setRadius(5).setWidth(i + 10);
      }
      vehicleBuilder.getEngineBuilder().setLiters(20);
  
      vehicle = vehicleBuilder.build();
      for (int i = 0; i < 4; i++) {
        Wheel wheel = vehicle.getWheel(i);
        assertEquals(5, wheel.getRadius());
        assertEquals(i + 10, wheel.getWidth());
      }
      assertEquals(20, vehicle.getEngine().getLiters());
      assertTrue(vehicle.hasEngine());
    }
  
    public void testMessagesAreCached() {
      Vehicle.Builder vehicleBuilder = Vehicle.newBuilder();
      vehicleBuilder.addWheelBuilder().setRadius(1).setWidth(2);
      vehicleBuilder.addWheelBuilder().setRadius(3).setWidth(4);
      vehicleBuilder.addWheelBuilder().setRadius(5).setWidth(6);
      vehicleBuilder.addWheelBuilder().setRadius(7).setWidth(8);
  
      // Make sure messages are cached.
      List<Wheel> wheels = new ArrayList<Wheel>(vehicleBuilder.getWheelList());
      for (int i = 0; i < wheels.size(); i++) {
        assertSame(wheels.get(i), vehicleBuilder.getWheel(i));
      }
  
      // Now get builders and check they didn't change.
      for (int i = 0; i < wheels.size(); i++) {
        vehicleBuilder.getWheel(i);
      }
      for (int i = 0; i < wheels.size(); i++) {
        assertSame(wheels.get(i), vehicleBuilder.getWheel(i));
      }
  
      // Change just one
      vehicleBuilder.getWheelBuilder(3).setRadius(20).setWidth(20);
  
      // Now get wheels and check that only that one changed
      for (int i = 0; i < wheels.size(); i++) {
        if (i < 3) {
          assertSame(wheels.get(i), vehicleBuilder.getWheel(i));
        } else {
          assertNotSame(wheels.get(i), vehicleBuilder.getWheel(i));
        }
      }
    }
  
    public void testRemove_WithNestedBuilders() {
      Vehicle.Builder vehicleBuilder = Vehicle.newBuilder();
      vehicleBuilder.addWheelBuilder().setRadius(1).setWidth(1);
      vehicleBuilder.addWheelBuilder().setRadius(2).setWidth(2);
      vehicleBuilder.removeWheel(0);
  
      assertEquals(1, vehicleBuilder.getWheelCount());
      assertEquals(2, vehicleBuilder.getWheel(0).getRadius());
    }
  
    public void testRemove_WithNestedMessages() {
      Vehicle.Builder vehicleBuilder = Vehicle.newBuilder();
      vehicleBuilder.addWheel(Wheel.newBuilder().setRadius(1).setWidth(1));
      vehicleBuilder.addWheel(Wheel.newBuilder().setRadius(2).setWidth(2));
      vehicleBuilder.removeWheel(0);
  
      assertEquals(1, vehicleBuilder.getWheelCount());
      assertEquals(2, vehicleBuilder.getWheel(0).getRadius());
    }
  
    public void testMerge() {
      Vehicle vehicle1 =
          Vehicle.newBuilder()
              .addWheel(Wheel.newBuilder().setRadius(1).build())
              .addWheel(Wheel.newBuilder().setRadius(2).build())
              .build();
  
      Vehicle vehicle2 = Vehicle.newBuilder().mergeFrom(vehicle1).build();
      // List should be the same -- no allocation
      assertSame(vehicle1.getWheelList(), vehicle2.getWheelList());
  
      Vehicle vehicle3 = vehicle1.toBuilder().build();
      assertSame(vehicle1.getWheelList(), vehicle3.getWheelList());
    }
  
    public void testGettingBuilderMarksFieldAsHaving() {
      Vehicle.Builder vehicleBuilder = Vehicle.newBuilder();
      vehicleBuilder.getEngineBuilder();
      Vehicle vehicle = vehicleBuilder.buildPartial();
      assertTrue(vehicle.hasEngine());
    }
  }
  