I'd be open to a class like:
class DescriptorSetBuilder {
// Adds the file and all its dependencies, if they have not been added
already.
// Returns this.
public DescriptorSetBuilder add(FileDescriptor file);
// Returns a FileDescriptorSet containing all files added with add() and
// their dependencies. Files will be in topological order -- each file
will
// appear before any files that import it.
public FileDescriptorSet build();
}
This way it's easy to build a set containing multiple independent files.
The next version of protoc will also output FileDescriptorSets in
topological order, as a side effect of the plugins change I'm working on.
On Sun, Nov 29, 2009 at 12:57 AM, Christopher Smith <cbsm...@gmail.com>wrote:
> Given that there is no Java version of protoc, it has been tempting to see
> how far one can get with just using FileDescriptorSet's and dynamic
> messages. I ended up building this short function for iteratively adding all
> the dependencies of a particular Message in to a FileDescriptorSet. While it
> wasn't too much pain, it was a tad annoying, and I am wondering why this
> kind of functionality isn't built in to the Java API. Here's what I ended up
> with:
>
> /**
> * Get the entire descriptor set needed to describe a message in
> * dependency order.
> *
> * @param aMessage the message to inspect
> * @return a complete descriptor set containing all the elements needed
> to parse this message
> */
>
> static FileDescriptorSet getDescriptorSetFor(final Message aMessage) {
> final FileDescriptor file =
> aMessage.getDescriptorForType().getFile();
> final List<FileDescriptor> fileDescriptors = new
> ArrayList<FileDescriptor>();
> fileDescriptors.add(file);
>
> //Don't use an iter as we intend to keep looping until the list
> //stops growing
> for (int i = 0; i < fileDescriptors.size(); ++i) {
> final FileDescriptor nextElement = fileDescriptors.get(i);
> for (FileDescriptor dependency : nextElement.getDependencies())
> {
> if (!fileDescriptors.contains(dependency)) {
> fileDescriptors.add(dependency);
> }
> }
> }
>
> final FileDescriptorSet.Builder builder =
> FileDescriptorSet.newBuilder();
> for (FileDescriptor descriptor : fileDescriptors) {
> builder.addFile(descriptor.toProto());
> }
> return builder.build();
> }
>
> Is this really the right way to handle this, and if so, any chance we can
> get this built in to the protobuf library?
>
> --
> Chris
>
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