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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Author: anuraag@google.com (Anuraag Agrawal)
// Author: tibell@google.com (Johan Tibell)
#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
#define GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
#include <Python.h>
#include <memory>
#ifndef _SHARED_PTR_H
#include <google/protobuf/stubs/shared_ptr.h>
#endif
namespace google {
namespace protobuf {
class Message;
class FieldDescriptor;
#ifdef _SHARED_PTR_H
using std::shared_ptr;
#else
using internal::shared_ptr;
#endif
namespace python {
struct CMessage;
typedef struct ExtensionDict {
PyObject_HEAD;
// This is the top-level C++ Message object that owns the whole
// proto tree. Every Python container class holds a
// reference to it in order to keep it alive as long as there's a
// Python object that references any part of the tree.
shared_ptr<Message> owner;
// Weak reference to parent message. Used to make sure
// the parent is writable when an extension field is modified.
CMessage* parent;
// Pointer to the C++ Message that this ExtensionDict extends.
// Not owned by us.
Message* message;
// A dict of child messages, indexed by Extension descriptors.
// Similar to CMessage::composite_fields.
PyObject* values;
} ExtensionDict;
extern PyTypeObject ExtensionDict_Type;
namespace extension_dict {
// Builds an Extensions dict for a specific message.
ExtensionDict* NewExtensionDict(CMessage *parent);
// Gets the number of extension values in this ExtensionDict as a python object.
//
// Returns a new reference.
PyObject* len(ExtensionDict* self);
// Releases extensions referenced outside this dictionary to keep outside
// references alive.
//
// Returns 0 on success, -1 on failure.
int ReleaseExtension(ExtensionDict* self,
PyObject* extension,
const FieldDescriptor* descriptor);
// Gets an extension from the dict for the given extension descriptor.
//
// Returns a new reference.
PyObject* subscript(ExtensionDict* self, PyObject* key);
// Assigns a value to an extension in the dict. Can only be used for singular
// simple types.
//
// Returns 0 on success, -1 on failure.
int ass_subscript(ExtensionDict* self, PyObject* key, PyObject* value);
// Clears an extension from the dict. Will release the extension if there
// is still an external reference left to it.
//
// Returns None on success.
PyObject* ClearExtension(ExtensionDict* self,
PyObject* extension);
// Gets an extension from the dict given the extension name as opposed to
// descriptor.
//
// Returns a new reference.
PyObject* _FindExtensionByName(ExtensionDict* self, PyObject* name);
} // namespace extension_dict
} // namespace python
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_PYTHON_CPP_EXTENSION_DICT_H__
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