YumaWorks

The following examples illustrates how to construct a container data node.

The container nodes can be constructed different ways depending whether it is a top level container or not. If the container is not a top level container, the following code can be used:

    ... 

    /* get the container obj template */ 
    obj_template_t *cont_obj = 
        obj_find_child(parentobj, 
                       modname, 
                       objname); 
    if (!cont_obj) { 
        return ERR_NCX_DEF_NOT_FOUND; 
    } 

    /* make a container value */ 
    val_value_t *cont_value = val_new_value(); 
    if (!cont_value) { 
        return ERR_INTERNAL_MEM; 
    } 
    val_init_from_template(cont_value, cont_obj);

   ...

On the other hand, if the container is a top level container, and you are constructing it in order to use as a static or virtual data within running datastore. If the container represents operational data, the following example can be used:

   ...

    cfg_template_t *runningcfg = cfg_get_config_id(NCX_CFGID_RUNNING); 
    if (!runningcfg || !runningcfg->root) { 
        return ERR_NCX_DEF_NOT_FOUND; 
    } 

   /* get the top object node */ 
    obj_template_t *topobj = 
        obj_find_template_top(mod,
            module_name, 
                              object_name);
    if (!topobj) {
  return ERR_NCX_DEF_NOT_FOUND; 
    }

    /* construct top level container */ 
    val_value_t *cont_value = val_new_value(); 
    if (!cont_value) { 
       return ERR_INTERNAL_MEM; 
    } 
    val_init_from_template(cont_value, topobj); 

    /* handing off the malloced memory here */ 
    res = val_child_add(cont_value, runningcfg->root);
    if (res != NO_ERR) {
   val_free_value(cont_value);
        return res;
    }

   ...

As a result of these two examples, we will have an empty container with no any children. In order to add a child to the container, the following example that creates multiple leaf-list entries and adds them into parent container can be used:

    ... 

    status_t res = NO_ERR;
    int32 value = 0; 
    for (value = 10; value <= 15 && res==NO_ERR; value++) { 
        val_value_t *leaflist_value =
            agt_make_int_leaf(parentobj, 
                              leaflistname, 
                              value, 
                              &res);
        if (!leaflist_value) { 
            return res; 
        } 

        /* add a new leaf-list entry to parent container */ 
        res = val_child_add(leaflist_value, cont_value);
        if (res != NO_ERR) {
            val_free_value(leaflist_value);
             return res;
        }
    }

   ...

In order to construct nested containers, the same steps should be applied twice, as illustrated below:

    ... 

    cfg_template_t *runningcfg = cfg_get_config_id(NCX_CFGID_RUNNING); 
    if (!runningcfg || !runningcfg->root) { 
        return ERR_NCX_DEF_NOT_FOUND; 
    } 

   /* get the top object node */ 
    obj_template_t *topobj = 
        obj_find_template_top(mod,
            module_name, 
                              object_name);
    if (!topobj) {
       return ERR_NCX_DEF_NOT_FOUND; 
    }

    /* construct top level container */ 
    val_value_t *cont_value = val_new_value(); 
    if (!cont_value) { 
       return ERR_INTERNAL_MEM; 
    } 
    val_init_from_template(cont_value, topobj); 

    /* handing off the malloced memory here */ 
    status_t res = val_child_add(cont_value, runningcfg→root);
    if (res != NO_ERR) {
        val_free_value(cont_value);
        return res;
    }

    /* get the next container obj template */ 
    obj_template_t *cont_obj = 
        obj_find_child(topobj, 
                       modname, 
                       objname); 
    if (!cont_obj) { 
        val_free_value(cont_value);
        return ERR_NCX_DEF_NOT_FOUND; 
    } 

    /* make a next container value */ 
    val_value_t *next_cont_value = val_new_value(); 
    if (!next_cont_value) { 
        val_free_value(cont_value);
        return ERR_INTERNAL_MEM; 
    } 
    val_init_from_template(next_cont_value, cont_obj);

    res = val_child_add(next_cont_value, cont_value);
    if (res != NO_ERR) {
        val_free_value(next_cont_value);
        val_free_value(cont_value);
        return res;
    }
        
    ...