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publicfinalclassDescriptors
Contains a collection of classes which describe protocol message types.
Every message type has a Descriptor, which lists all its fields and other information
about a type. You can get a message type's descriptor by calling
MessageType.getDescriptor(), or (given a message object of the type)
message.getDescriptorForType(). Furthermore, each message is associated with a FileDescriptor for a relevant .proto file. You can obtain it by calling
Descriptor.getFile(). A FileDescriptor contains descriptors for all the messages defined
in that file, and file descriptors for all the imported .proto files.
Descriptors are built from DescriptorProtos, as defined in
google/protobuf/descriptor.proto.