Hi All,
I have met some problems about changing the value in my protobuff message.
This is the proto file.
message Info {
repeated InfoUnit unit = 1;
}
message InfoUnit {
optional uint64 id = 1;
repeated DateUnit date_unit = 2;
}
message DateUnit {
optional uint64 date = 1;
}
My task is simple. I get an Info message, then update Info's InfoUnit list.
For example:
1. update the first UnitInfo's first DateUnit's date = 2.
2. add a new UnitInfo to Info with default values.
At first,
I think I can just get the list and then update it.
Info.Builder builder = infoMessage.toBuilder();
List<InfoUnit> list = builder.getInfoUnitList();
//first infoUnit, first dataUnit, 2
update(list.get(0), 0, 2);
list.add(InfoUnit.newBuilder()...........build())
but finally this does not work.
I find an explain in this website:
https://github.com/google/protobuf/issues/16
I do not understand and I don't find a good way to solve this problem,
So I change to a new plan, but this is complex.
Info.Builder builder = infoMessage.toBuilder();
//copy the builder list
List<InfoUnit.Builder> builderList = new
ArrayList<InfoUnit>(builder.getInfoUnitBuilderList());
//finish update and add
update(....);
//clear the InfoUnit list
builder.clearInfouNIT();
//rebuild the list
for(InfoUnit.Builder infoUnitBuilder: builderList)
builder.addInfoUnit(infoUnitBuilder);
//rebuild this Info
builder.build();
I copy the InfoUnit's builder list to update, then clear the former
InfoUnit list and use the copy to rebuild the InfoUnit list.
You my find that the DataUnit is also a list, so I do this work again. I
don't write the DataUnit's update codes here, just use 'update' to replace
briefly.
Of course this worked. But I believe there must be a better way to update
the value of repeat type in message.
If someone has good ideas or has some questions about my situation, leave
message to me.
Expect anyone's reply :)
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