src/third_party/protobuf-3/javanano/src/test/java/com/google/protobuf/nano/map_test.proto

// Protocol Buffers - Google's data interchange format
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syntax = "proto3";

package map_test;

option java_package = "com.google.protobuf";
option java_outer_classname = "MapTestProto";

message TestMap {
  message MessageValue {
    int32 value = 1;
    int32 value2 = 2;
  }
  enum EnumValue {
    FOO = 0;
    BAR = 1;
    BAZ = 2;
    QUX = 3;
  }

  map<int32, int32>        int32_to_int32_field = 1;
  map<int32, string>       int32_to_string_field = 2;
  map<int32, bytes>        int32_to_bytes_field = 3;
  map<int32, EnumValue>    int32_to_enum_field = 4;
  map<int32, MessageValue> int32_to_message_field = 5;
  map<string, int32>       string_to_int32_field = 6;
  map<bool, bool>          bool_to_bool_field = 7;

  // Test all the other primitive types. As the key and value are not coupled in
  // the implementation, we do not test all the combinations of key/value pairs,
  // so that we can keep the number of test cases manageable
  map<uint32, uint32>      uint32_to_uint32_field = 11;
  map<sint32, sint32>      sint32_to_sint32_field = 12;
  map<fixed32, fixed32>    fixed32_to_fixed32_field = 13;
  map<sfixed32, sfixed32>  sfixed32_to_sfixed32_field = 14;
  map<int64, int64>        int64_to_int64_field = 15;
  map<uint64, uint64>      uint64_to_uint64_field = 16;
  map<sint64, sint64>      sint64_to_sint64_field = 17;
  map<fixed64, fixed64>    fixed64_to_fixed64_field = 18;
  map<sfixed64, sfixed64>  sfixed64_to_sfixed64_field = 19;
}