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 com.google.protobuf.UnittestLite.TestAllTypesLite;
  import com.google.protobuf.UnittestLite.TestPackedExtensionsLite;
  import com.google.protobuf.UnittestLite.TestParsingMergeLite;
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import junit.framework.TestCase;
  
  public class ParserLiteTest extends TestCase {
    private void assertRoundTripEquals(MessageLite message, ExtensionRegistryLite registry)
        throws Exception {
      final byte[] data = message.toByteArray();
      final int offset = 20;
      final int length = data.length;
      final int padding = 30;
      Parser<? extends MessageLite> parser = message.getParserForType();
      assertEquals(message, parser.parseFrom(data, registry));
      assertEquals(
          message,
          parser.parseFrom(generatePaddingArray(data, offset, padding), offset, length, registry));
      assertEquals(message, parser.parseFrom(message.toByteString(), registry));
      assertEquals(message, parser.parseFrom(new ByteArrayInputStream(data), registry));
      assertEquals(message, parser.parseFrom(CodedInputStream.newInstance(data), registry));
      assertEquals(
          message, parser.parseFrom(message.toByteString().asReadOnlyByteBuffer(), registry));
    }
  
    @SuppressWarnings("unchecked")
    private void assertRoundTripEquals(MessageLite message) throws Exception {
      final byte[] data = message.toByteArray();
      final int offset = 20;
      final int length = data.length;
      final int padding = 30;
  
      Parser<MessageLite> parser = (Parser<MessageLite>) message.getParserForType();
      assertEquals(message, parser.parseFrom(data));
      assertEquals(
          message, parser.parseFrom(generatePaddingArray(data, offset, padding), offset, length));
      assertEquals(message, parser.parseFrom(message.toByteString()));
      assertEquals(message, parser.parseFrom(new ByteArrayInputStream(data)));
      assertEquals(message, parser.parseFrom(CodedInputStream.newInstance(data)));
      assertEquals(message, parser.parseFrom(message.toByteString().asReadOnlyByteBuffer()));
    }
  
    private byte[] generatePaddingArray(byte[] data, int offset, int padding) {
      byte[] result = new byte[offset + data.length + padding];
      System.arraycopy(data, 0, result, offset, data.length);
      return result;
    }
  
    public void testParseExtensionsLite() throws Exception {
      assertRoundTripEquals(
          TestUtilLite.getAllLiteExtensionsSet(), TestUtilLite.getExtensionRegistryLite());
    }
  
    public void testParsePacked() throws Exception {
      assertRoundTripEquals(TestUtil.getPackedSet());
      assertRoundTripEquals(TestUtil.getPackedExtensionsSet(), TestUtil.getExtensionRegistry());
    }
  
    public void testParsePackedLite() throws Exception {
      assertRoundTripEquals(
          TestUtilLite.getLitePackedExtensionsSet(), TestUtilLite.getExtensionRegistryLite());
    }
  
    public void testParseDelimitedToLite() throws Exception {
      // Write MessageLite with packed extension fields.
      TestPackedExtensionsLite packedMessage = TestUtilLite.getLitePackedExtensionsSet();
      ByteArrayOutputStream output = new ByteArrayOutputStream();
      packedMessage.writeDelimitedTo(output);
      packedMessage.writeDelimitedTo(output);
  
      InputStream input = new ByteArrayInputStream(output.toByteArray());
      assertEquals(
          packedMessage,
          packedMessage
              .getParserForType()
              .parseDelimitedFrom(input, TestUtilLite.getExtensionRegistryLite()));
      assertEquals(
          packedMessage,
          packedMessage
              .getParserForType()
              .parseDelimitedFrom(input, TestUtilLite.getExtensionRegistryLite()));
    }
  
    /** Helper method for {@link #testParsingMergeLite()}. */
    private void assertMessageMerged(TestAllTypesLite allTypes) throws Exception {
      assertEquals(3, allTypes.getOptionalInt32());
      assertEquals(2, allTypes.getOptionalInt64());
      assertEquals("hello", allTypes.getOptionalString());
    }
  
    public void testParsingMergeLite() throws Exception {
      // Build messages.
      TestAllTypesLite.Builder builder = TestAllTypesLite.newBuilder();
      TestAllTypesLite msg1 = builder.setOptionalInt32(1).build();
      builder.clear();
      TestAllTypesLite msg2 = builder.setOptionalInt64(2).build();
      builder.clear();
      TestAllTypesLite msg3 = builder.setOptionalInt32(3).setOptionalString("hello").build();
  
      // Build groups.
      TestParsingMergeLite.RepeatedFieldsGenerator.Group1 optionalG1 =
          TestParsingMergeLite.RepeatedFieldsGenerator.Group1.newBuilder().setField1(msg1).build();
      TestParsingMergeLite.RepeatedFieldsGenerator.Group1 optionalG2 =
          TestParsingMergeLite.RepeatedFieldsGenerator.Group1.newBuilder().setField1(msg2).build();
      TestParsingMergeLite.RepeatedFieldsGenerator.Group1 optionalG3 =
          TestParsingMergeLite.RepeatedFieldsGenerator.Group1.newBuilder().setField1(msg3).build();
      TestParsingMergeLite.RepeatedFieldsGenerator.Group2 repeatedG1 =
          TestParsingMergeLite.RepeatedFieldsGenerator.Group2.newBuilder().setField1(msg1).build();
      TestParsingMergeLite.RepeatedFieldsGenerator.Group2 repeatedG2 =
          TestParsingMergeLite.RepeatedFieldsGenerator.Group2.newBuilder().setField1(msg2).build();
      TestParsingMergeLite.RepeatedFieldsGenerator.Group2 repeatedG3 =
          TestParsingMergeLite.RepeatedFieldsGenerator.Group2.newBuilder().setField1(msg3).build();
  
      // Assign and serialize RepeatedFieldsGenerator.
      ByteString data =
          TestParsingMergeLite.RepeatedFieldsGenerator.newBuilder()
              .addField1(msg1)
              .addField1(msg2)
              .addField1(msg3)
              .addField2(msg1)
              .addField2(msg2)
              .addField2(msg3)
              .addField3(msg1)
              .addField3(msg2)
              .addField3(msg3)
              .addGroup1(optionalG1)
              .addGroup1(optionalG2)
              .addGroup1(optionalG3)
              .addGroup2(repeatedG1)
              .addGroup2(repeatedG2)
              .addGroup2(repeatedG3)
              .addExt1(msg1)
              .addExt1(msg2)
              .addExt1(msg3)
              .addExt2(msg1)
              .addExt2(msg2)
              .addExt2(msg3)
              .build()
              .toByteString();
  
      // Parse TestParsingMergeLite.
      ExtensionRegistryLite registry = ExtensionRegistryLite.newInstance();
      UnittestLite.registerAllExtensions(registry);
      TestParsingMergeLite parsingMerge = TestParsingMergeLite.parser().parseFrom(data, registry);
  
      // Required and optional fields should be merged.
      assertMessageMerged(parsingMerge.getRequiredAllTypes());
      assertMessageMerged(parsingMerge.getOptionalAllTypes());
      assertMessageMerged(parsingMerge.getOptionalGroup().getOptionalGroupAllTypes());
      assertMessageMerged(parsingMerge.getExtension(TestParsingMergeLite.optionalExt));
  
      // Repeated fields should not be merged.
      assertEquals(3, parsingMerge.getRepeatedAllTypesCount());
      assertEquals(3, parsingMerge.getRepeatedGroupCount());
      assertEquals(3, parsingMerge.getExtensionCount(TestParsingMergeLite.repeatedExt));
    }
  }
  