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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