descriptor_pool.h

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#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__
#define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__
 
#include <Python.h>
 
#include <unordered_map>
#include <google/protobuf/descriptor.h>
 
namespace google {
namespace protobuf {
namespace python {
 
struct PyMessageFactory;
 
// The (meta) type of all Messages classes.
struct CMessageClass;
 
// Wraps operations to the global DescriptorPool which contains information
// about all messages and fields.
//
// There is normally one pool per process. We make it a Python object only
// because it contains many Python references.
//
// "Methods" that interacts with this DescriptorPool are in the cdescriptor_pool
// namespace.
typedef struct PyDescriptorPool {
  PyObject_HEAD
 
  // The C++ pool containing Descriptors.
  DescriptorPool* pool;
 
  // The error collector to store error info. Can be NULL. This pointer is
  // owned.
  DescriptorPool::ErrorCollector* error_collector;
 
  // The C++ pool acting as an underlay. Can be NULL.
  // This pointer is not owned and must stay alive.
  const DescriptorPool* underlay;
 
  // The C++ descriptor database used to fetch unknown protos. Can be NULL.
  // This pointer is owned.
  const DescriptorDatabase* database;
 
  // The preferred MessageFactory to be used by descriptors.
  // TODO(amauryfa): Don't create the Factory from the DescriptorPool, but
  // use the one passed while creating message classes. And remove this member.
  PyMessageFactory* py_message_factory;
 
  // Cache the options for any kind of descriptor.
  // Descriptor pointers are owned by the DescriptorPool above.
  // Python objects are owned by the map.
  std::unordered_map<const void*, PyObject*>* descriptor_options;
} PyDescriptorPool;
 
 
extern PyTypeObject PyDescriptorPool_Type;
 
namespace cdescriptor_pool {
 
 
// The functions below are also exposed as methods of the DescriptorPool type.
 
// Looks up a field by name. Returns a PyFieldDescriptor corresponding to
// the field on success, or NULL on failure.
//
// Returns a new reference.
PyObject* FindFieldByName(PyDescriptorPool* self, PyObject* name);
 
// Looks up an extension by name. Returns a PyFieldDescriptor corresponding
// to the field on success, or NULL on failure.
//
// Returns a new reference.
PyObject* FindExtensionByName(PyDescriptorPool* self, PyObject* arg);
 
// Looks up an enum type by name. Returns a PyEnumDescriptor corresponding
// to the field on success, or NULL on failure.
//
// Returns a new reference.
PyObject* FindEnumTypeByName(PyDescriptorPool* self, PyObject* arg);
 
// Looks up a oneof by name. Returns a COneofDescriptor corresponding
// to the oneof on success, or NULL on failure.
//
// Returns a new reference.
PyObject* FindOneofByName(PyDescriptorPool* self, PyObject* arg);
 
}  // namespace cdescriptor_pool
 
// Retrieve the global descriptor pool owned by the _message module.
// This is the one used by pb2.py generated modules.
// Returns a *borrowed* reference.
// "Default" pool used to register messages from _pb2.py modules.
PyDescriptorPool* GetDefaultDescriptorPool();
 
// Retrieve the python descriptor pool owning a C++ descriptor pool.
// Returns a *borrowed* reference.
PyDescriptorPool* GetDescriptorPool_FromPool(const DescriptorPool* pool);
 
// Initialize objects used by this module.
bool InitDescriptorPool();
 
}  // namespace python
}  // namespace protobuf
}  // namespace google
 
#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_POOL_H__