java/src/test/java/com/google/protobuf/test_extra_interfaces.proto

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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// Author: Darick Tong (darick@google.com)

package protobuf_unittest;

message Proto1 {
  option experimental_java_message_interface =
      "com.google.protobuf.ExtraInterfaces.HasBoolValue";

  option experimental_java_interface_extends =
      "com.google.protobuf.ExtraInterfaces.HasByteValue";

  option experimental_java_message_interface =
      "com.google.protobuf.ExtraInterfaces.HasStringValue<Proto1>";

  option experimental_java_builder_interface =
      "com.google.protobuf.ExtraInterfaces.HasStringValueBuilder"
      "<Proto1, Builder>";

  optional string string_value = 1;
  optional bool bool_value = 2;
  optional bytes byte_value = 3;
  optional int32 int_value = 4;
}

message Proto2 {
  option experimental_java_message_interface =
      "com.google.protobuf.ExtraInterfaces.HasBoolValue";

  optional bool bool_value = 1;
}