common/common-protobuf/src/main/java/org/apache/servicecomb/codec/protobuf/schema/SchemaToProtoGenerator.java [186:202]:
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  private void createEnum(String enumName, List<String> enums) {
    if (!messages.add(enumName)) {
      // already created
      return;
    }

    appendLine(msgStringBuilder, "enum %s {", enumName);
    for (int idx = 0; idx < enums.size(); idx++) {
      if (isValidEnum(enums.get(idx))) {
        appendLine(msgStringBuilder, "  %s =%d;", enums.get(idx), idx);
      } else {
        throw new IllegalStateException(
            String.format("enum class [%s] name [%s] not supported by protobuffer.", enumName, enums.get(idx)));
      }
    }
    appendLine(msgStringBuilder, "}");
  }
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common/common-protobuf/src/main/java/org/apache/servicecomb/codec/protobuf/internal/converter/SwaggerToProtoGenerator.java [247:263]:
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  private void createEnum(String enumName, List<String> enums) {
    if (!messages.add(enumName)) {
      // already created
      return;
    }

    appendLine(msgStringBuilder, "enum %s {", enumName);
    for (int idx = 0; idx < enums.size(); idx++) {
      if (isValidEnum(enums.get(idx))) {
        appendLine(msgStringBuilder, "  %s =%d;", enums.get(idx), idx);
      } else {
        throw new IllegalStateException(
            String.format("enum class [%s] name [%s] not supported by protobuffer.", enumName, enums.get(idx)));
      }
    }
    appendLine(msgStringBuilder, "}");
  }
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