On Mon, Jul 6, 2015 at 11:23 AM, Edgard Lima <[email protected]> wrote:
> // my .proto
> syntax = "proto3";import "google/protobuf/any.proto";
> message CommandListPrinters {}
> message Commands {
> int32 id = 1;
> repeated google.protobuf.Any command = 2;}
>
> // my.java
>
> CommandListPrinters commandListPrinters =
> CommandListPrinters.newBuilder().build();Any any =
> Any.newBuilder().setValue(commandListPrinters.toByteString()).build();Commands.Builder
> commandsBuilder = Commands.newBuilder().setId(0);
> commandsBuilder.addCommand(any);Commands commands =
> commandsBuilder.build();//byte [] ba = commands.toByteArray();
> Commands cmds2 = Commands.parseFrom(ba);for (Any any2 :
> cmds2.getCommandList()) {
> Descriptor fe = any2.getDescriptorForType();
>
> // This IF is FALSE;
> if (fe.equals(CommandListPrinters.getDescriptor()) ) {
> CommandListPrinters cmdLR =
> CommandListPrinters.parseFrom(any2.getValue());
> }
> }
>
> We will add some helper functions in Java to ease the use of Any pretty
soon. For the time being you will probably use Any like this:
String getTypeUrl(Descriptor descriptor) {
return "type.googleapis.com/" + descriptor.getFullName();
}
// Create Any message:
Any createAny(Message message) {
return Any.newBuilder()
.setTypeId(getTypeUrl(message.getDescriptorForType()))
.setValue(message.toByteString())
.build();
}
CommandListPrinters commandListPrinters =
CommandListPrinters.newBuilder().build();
Commands.Builder commandsBuilder = Commands.newBuilder().setId(0);
commandsBuilder.addCommand(createAny(commandListPrinters));
Commands commands = commandsBuilder.build();
for (Any any : commands.getCommandList()) {
if
(any.getTypeUrl().equals(getTypeUrl(CommandListPrinters.getDescriptor()))) {
CommandListPrinters cmdLR =
CommandListPrinters.parseFrom(any2.getValue());
...
}
}
With the helper functions we will introduce soon, the code will be
simplified to this:
CommandListPrinters commandListPrinters =
CommandListPrinters.newBuilder().build();
Commands.Builder commandsBuilder = Commands.newBuilder().setId(0);
commandsBuilder.addCommand(*Any.pack(commandListPrinters)*);
Commands commands = commandsBuilder.build();
for (Any any : commands.getCommandList()) {
if (*any.is <http://any.is>(CommandListPrinters.getClass())*) {
CommandListPrinters cmdLR = *any.unpack(CommandListPrinters.getClass())*
;
...
}
}
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