How to convert protobuf with same structure in java

Tobias Neef | 24 Jul 2012 16:55

How to convert protobuf with same structure in java

Hi,

I try to convert the Java representation of a protobuf message into another message with the same fields (ordering, names, types). I try to do it the following way but this ends in a java.lang.InstantiationException:

public static <T extends GeneratedMessage> T commandToEvent(GeneratedMessage command,

Class<T> clazz) {

try {

Builder builder = clazz.newInstance().newBuilderForType();

Map<FieldDescriptor, Object> fields = command.getAllFields();

for(Entry<FieldDescriptor, Object> entry : fields.entrySet()) {

builder.setField(entry.getKey(), entry.getValue());

}

return (T)builder.build();

} catch (Exception e) {

Throwables.propagate(e);

}

return null;

}

Does somebody has an idea how to do this?

Thanks,

Tobias

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