CODEWITHSUNDEEP
javaprotocol-buffersprotobuf-java
tigoa
tigoa

Reputation: 93

Conditionally set a field of a Protobuf message

I am creating a converter method between two protobuf messages A and B:

message A {
 optional int64 id = 1;
 optional string name = 2;
}
 
message B {
 optional int64 id = 1;
 optional C c= 2;
}

message C {
 optional string name = 1; 
}

My code is the following:

    private A convertFromBToA(B b) {
        return A.newBuilder()
                .setId(B.getId())
                .setName(b.hasC() ? b.getC().getName() : null).build();
    }

Essentially, I only want to set the name field of message A if B's C field has a name field. Otherwise I want to leave A's name field unset. Is this the correct way to do so?

Upvotes: 1

Views: 1051

Answers (1)

user229044
user229044

Reputation: 239521

Just use an if to conditionally call setName only if you have a name to set, rather than always calling setName even when there is no argument to give it:

A a = A.newBuilder().setId(B.getId())

if (b.hasC()) {
  a = a.setName(b.getC());
}

return a.build();

Upvotes: 2

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