void addImportedProto(Proto proto)
    {
        if (proto.url == null)
            importedProtos.put(proto.file.toURI().toString(), proto);
        else
            importedProtos.put(proto.url.toString(), proto);
    }
Returns the java package name that was configured in the proto. Note that {@link #getJavaPackageName()} will have
the same value as this, if the compiler options did not have entries that override it.
protostuff-parser/src/main/java/io/protostuff/parser/Proto.java