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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed 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 metis_CommandOps.h
* @brief The function structure defining a CLI command
*
* The function structure that defines a CLI command. Each command will return one
* of these which defines how to run the command.
*
*/
#ifndef Metis_metis_CommandOps_h
#define Metis_metis_CommandOps_h
#include <parc/algol/parc_List.h>
#include <ccnx/forwarder/metis/config/metis_CommandReturn.h>
// forward reference
struct metis_command_parser;
struct metis_command_ops;
typedef struct metis_command_ops MetisCommandOps;
/**
* @typedef MetisCommandOps
* @abstract Each command implements a MetisCommandOps
* @constant closure is a user-specified pointer for any state the user needs
* @constant command The text string of the command, must be the spelled out string, e.g. "help list routes"
* @constant init A function to call to initialize the command at program startup
* @constant execute A function to call to execute the command
* @constant destroyer A function to call to release the command
* @discussion
* Typically, the root of the thee has an Init function that then initilizes the
* rest of the tree. For example:
*
* @code
* const MetisCommandOps metisControl_Root = {
* .closure = NULL,
* .command = "", // empty string for root
* .init = metisControl_Root_Init,
* .execute = metisControl_Root_Execute
* .destroyer = NULL
* };
* @endcode
*
* The metisControl_Root_Init function will then begin adding the subtree under root. For example:
*
* @code
* const MetisCommandOps metisControl_Add = {
* .closure = NULL,
* .command = "add",
* .init = metisControl_Add_Init,
* .execute = metisControl_Add_Execute,
* .destroyer = NULL
* };
*
* static void
* metisControl_Root_Init(MetisControlState *state, MetisCommandOps *ops)
* {
* metisControlState_RegisterCommand(state, &metisControl_Add);
* }
* @endcode
*/
struct metis_command_ops {
void *closure;
char *command;
void (*init)(struct metis_command_parser *parser, MetisCommandOps *ops);
MetisCommandReturn (*execute)(struct metis_command_parser *parser, MetisCommandOps *ops, PARCList *args);
void (*destroyer)(MetisCommandOps **opsPtr);
};
/**
* A helper function to create the pubically defined MetisCommandOps.
*
* Retruns allocated memory of the command
*
* @param [in] command The string is copied
*
* @retval <#value#> <#explanation#>
*
* Example:
* @code
* <#example#>
* @endcode
*/
MetisCommandOps *metisCommandOps_Create(void *closure,
const char *command,
void (*init)(struct metis_command_parser *parser, MetisCommandOps *ops),
MetisCommandReturn (*execute)(struct metis_command_parser *parser, MetisCommandOps *ops, PARCList *args),
void (*destroyer)(MetisCommandOps **opsPtr));
/**
* De-allocates the memory of the MetisCommandOps and the copied command string
*
* <#Paragraphs Of Explanation#>
*
* @param [<#in out in,out#>] <#name#> <#description#>
*
* @retval <#value#> <#explanation#>
*
* Example:
* @code
* <#example#>
* @endcode
*/
void metisCommandOps_Destroy(MetisCommandOps **opsPtr);
#endif // Metis_metis_CommandOps_h
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