THUAI6/CAPI/cpp/grpc/include/upb/reflection.h

/*
 * Copyright (c) 2009-2021, Google LLC
 * All rights reserved.
 *
 * 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
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 *       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
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 */

#ifndef UPB_REFLECTION_H_
#define UPB_REFLECTION_H_

#include "upb/array.h"
#include "upb/def.h"
#include "upb/map.h"
#include "upb/msg.h"
#include "upb/port_def.inc"
#include "upb/upb.h"

#ifdef __cplusplus
extern "C"
{
#endif

    upb_MessageValue upb_FieldDef_Default(const upb_FieldDef* f);

    /** upb_Message
     * *******************************************************************/

    /* Creates a new message of the given type in the given arena. */
    upb_Message* upb_Message_New(const upb_MessageDef* m, upb_Arena* a);

    /* Returns the value associated with this field. */
    upb_MessageValue upb_Message_Get(const upb_Message* msg, const upb_FieldDef* f);

    /* Returns a mutable pointer to a map, array, or submessage value.  If the given
     * arena is non-NULL this will construct a new object if it was not previously
     * present.  May not be called for primitive fields. */
    upb_MutableMessageValue upb_Message_Mutable(upb_Message* msg, const upb_FieldDef* f, upb_Arena* a);

    /* May only be called for fields where upb_FieldDef_HasPresence(f) == true. */
    bool upb_Message_Has(const upb_Message* msg, const upb_FieldDef* f);

    /* Returns the field that is set in the oneof, or NULL if none are set. */
    const upb_FieldDef* upb_Message_WhichOneof(const upb_Message* msg, const upb_OneofDef* o);

    /* Sets the given field to the given value.  For a msg/array/map/string, the
     * caller must ensure that the target data outlives |msg| (by living either in
     * the same arena or a different arena that outlives it).
     *
     * Returns false if allocation fails. */
    bool upb_Message_Set(upb_Message* msg, const upb_FieldDef* f, upb_MessageValue val, upb_Arena* a);

    /* Clears any field presence and sets the value back to its default. */
    void upb_Message_ClearField(upb_Message* msg, const upb_FieldDef* f);

    /* Clear all data and unknown fields. */
    void upb_Message_Clear(upb_Message* msg, const upb_MessageDef* m);

    /* Iterate over present fields.
     *
     * size_t iter = kUpb_Message_Begin;
     * const upb_FieldDef *f;
     * upb_MessageValue val;
     * while (upb_Message_Next(msg, m, ext_pool, &f, &val, &iter)) {
     *   process_field(f, val);
     * }
     *
     * If ext_pool is NULL, no extensions will be returned.  If the given symtab
     * returns extensions that don't match what is in this message, those extensions
     * will be skipped.
     */

#define kUpb_Message_Begin -1
    bool upb_Message_Next(const upb_Message* msg, const upb_MessageDef* m, const upb_DefPool* ext_pool, const upb_FieldDef** f, upb_MessageValue* val, size_t* iter);

    /* Clears all unknown field data from this message and all submessages. */
    bool upb_Message_DiscardUnknown(upb_Message* msg, const upb_MessageDef* m, int maxdepth);

#ifdef __cplusplus
} /* extern "C" */
#endif

#include "upb/port_undef.inc"

#endif /* UPB_REFLECTION_H_ */