protocol buffer GetRepeatedField (reflection) code optimization

I'm using the reflection feature of protocol buffer to read message field value at run time.

The proto I have:

package xapp.battle;
    message BATTLE_DATA {
        repeated AInfo aInfo = 1;
        repeated BInfo bInfo = 2;
        repeated CInfo cInfo = 3;
        // a lot other repeated messages
    }

    message AInfo {
        int32 test_field = 1;
        // ......
    }

    message BInfo {
        int32 test_field = 1;
        // ......
    }

    message CInfo {
        int32 test_field = 1;
        // ......
    }

The code now I have:

void DO_SOMETHING(messageName) {

    const Descriptor* pDescriptor = BATTLE_DATA->GetDescriptor();
    const FieldDescriptor* pMessageField = pDescriptor->FindFieldByName(messageName);
    const Reflection* pReflection = BATTLE_DATA->GetReflection();

    if (messageName == "aInfo") {
        const RepeatedPtrField<::xapp::battle::AInfo> repeated_ptr_field = pReflection->GetRepeatedPtrField<::xapp::battle::AInfo>(*BATTLE_DATA, pMessageField);
        for (int i = 0; i < repeated_ptr_field.size(); i ++) {
            ::xapp::battle::AInfo messageInfo = repeated_ptr_field.Get(i);
            // continue to read the test_field value of messageInfo
        }
    }
    else if (messageName == "bInfo") {
        const RepeatedPtrField<::xapp::battle::BInfo> repeated_ptr_field = pReflection->GetRepeatedPtrField<::xapp::battle::BInfo>(*BATTLE_DATA, pMessageField);
        for (int i = 0; i < repeated_ptr_field.size(); i ++) {
            ::xapp::battle::BInfo messageInfo = repeated_ptr_field.Get(i);
            // continue to read the test_field value of messageInfo
        }
    }
    else if (messageName == "CInfo") {
        const RepeatedPtrField<::xapp::battle::CInfo> repeated_ptr_field = pReflection->GetRepeatedPtrField<::xapp::battle::CInfo>(*BATTLE_DATA, pMessageField);
        for (int i = 0; i < repeated_ptr_field.size(); i ++) {
            ::xapp::battle::CInfo messageInfo = repeated_ptr_field.Get(i);
            // continue to read the test_field value of messageInfo
        }
    }
    // ......
    else {
            LOG("loadOneBin - Unknown messageName");
    }
}

This code works but obviously it's not the best solution since there are so many repeated "else-if" code blocks.

What I want is something like (at least get rid of those "else-if" blocks):

const RepeatedPtrField<::xapp::battle::MESSAGE_NAME> repeated_ptr_field = pReflection->GetRepeatedPtrField<::xapp::battle::MESSAGE_NAME>(*BATTLE_DATA, pMessageField);
for (int i = 0; i < repeated_ptr_field.size(); i ++) {
    ::xapp::battle::MESSAGE_NAME messageInfo = repeated_ptr_field.Get(i);
    // continue to read the test_field value of messageInfo

}

The source code of GetRepeatedPtrField:

template<typename PB>
inline const RepeatedPtrField<PB>& Reflection::GetRepeatedPtrField(
    const Message& message, const FieldDescriptor* field) const {
  return *static_cast<RepeatedPtrField<PB>* >(
      MutableRawRepeatedField(const_cast<Message*>(&message), field,
          FieldDescriptor::CPPTYPE_MESSAGE, -1,
          PB::default_instance().GetDescriptor()));
}

Any suggestion will be appreciated, thanks :)