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/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file  ap_provider.h
 * @brief Apache Provider API
 *
 * @defgroup APACHE_CORE_PROVIDER Provider API
 * @ingroup  APACHE_CORE
 * @{
 */

#ifndef AP_PROVIDER_H
#define AP_PROVIDER_H

#include "ap_config.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    const char *provider_name;
} ap_list_provider_names_t;

typedef struct {
    const char *provider_group;
    const char *provider_version;
} ap_list_provider_groups_t;

/**
 * This function is used to register a provider with the global
 * provider pool.
 * @param pool The pool to create any storage from
 * @param provider_group The group to store the provider in
 * @param provider_name The name for this provider
 * @param provider_version The version for this provider
 * @param provider Opaque structure for this provider
 * @return APR_SUCCESS if all went well
 */
AP_DECLARE(apr_status_t) ap_register_provider(apr_pool_t *pool,
                                              const char *provider_group,
                                              const char *provider_name,
                                              const char *provider_version,
                                              const void *provider);

/**
 * This function is used to retrieve a provider from the global
 * provider pool.
 * @param provider_group The group to look for this provider in
 * @param provider_name The name for the provider
 * @param provider_version The version for the provider
 * @return provider pointer to provider if found, NULL otherwise
 */
AP_DECLARE(void *) ap_lookup_provider(const char *provider_group,
                                      const char *provider_name,
                                      const char *provider_version);

/**
 * This function is used to retrieve a list (array) of provider
 * names from the specified group with the specified version.
 * @param pool The pool to create any storage from
 * @param provider_group The group to look for this provider in
 * @param provider_version The version for the provider
 * @return pointer to array of ap_list_provider_names_t of provider names (could be empty)
 */

AP_DECLARE(apr_array_header_t *) ap_list_provider_names(apr_pool_t *pool,
                                              const char *provider_group,
                                              const char *provider_version);

/**
 * This function is used to retrieve a list (array) of provider groups and versions
 * @param pool The pool to create any storage from
 * @return pointer to array of ap_list_provider_groups_t of provider groups
 *         and versions (could be empty)
 */

AP_DECLARE(apr_array_header_t *) ap_list_provider_groups(apr_pool_t *pool);


#ifdef __cplusplus
}
#endif

#endif
/** @} */