InstancePointerTableHelper.h

00001 /**
00002  * @file    InstancePointerTableHelper.h
00003  * @brief   instance pointer table helper functions for DynamicResource
00004  * @author  Doug Anson
00005  * @version 1.0
00006  * @see
00007  *
00008  * Copyright (c) 2014
00009  *
00010  * Licensed under the Apache License, Version 2.0 (the "License");
00011  * you may not use this file except in compliance with the License.
00012  * You may obtain a copy of the License at
00013  *
00014  *     http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing, software
00017  * distributed under the License is distributed on an "AS IS" BASIS,
00018  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00019  * See the License for the specific language governing permissions and
00020  * limitations under the License.
00021  */
00022 
00023 #ifndef __INSTANCE_POINTER_TABLE_HELPER_H__
00024 #define __INSTANCE_POINTER_TABLE_HELPER_H__
00025 
00026 // InstancePointerTable
00027 #include "InstancePointerTable.h"
00028 extern Logger logger;
00029 InstancePointerTable              __nsdl_lookup_table(&logger);         // Instance Pointer Table
00030 
00031 
00032 // lookup a DynamicResource instance indexed by our resource URI as the key
00033 extern "C" DynamicResource *__lookup_instance_pointer(const char *uri,const int uri_length)
00034 {
00035     if (uri != NULL && uri_length > 0) {
00036         string key(uri,uri_length);
00037         return (DynamicResource *)__nsdl_lookup_table.get(key);
00038     }
00039     return NULL;
00040 }
00041 
00042 // callback function for NSDL library to call into... ASSUMPTION: 1 and only 1 DynamicResource<> instance per Resource URI...
00043 extern "C" uint8_t ipt_helper_nsdl_callback_stub(sn_coap_hdr_s *received_coap_ptr, sn_nsdl_addr_s *address, sn_proto_info_s * proto)
00044 {
00045     uint8_t status = 1;
00046     if (received_coap_ptr != NULL) {
00047         // retrieve our resource instance via lookup/index by our resource URI
00048         DynamicResource *instance = __lookup_instance_pointer((const char *)received_coap_ptr->uri_path_ptr,received_coap_ptr->uri_path_len);
00049         if (instance != NULL) {
00050             std::printf("Instance retrieved.. processing callback...\r\n");
00051             status = instance->process(received_coap_ptr,address,proto);
00052         } else {
00053             std::printf("Unable to process callback: unable to lookup DynamicResource<> instance pointer... ignorning...\r\n");
00054         }
00055     } else {
00056         std::printf("Unable to process callback: received coap pointer is NULL... ignoring...\r\n");
00057     }
00058     return status;
00059 }
00060 
00061 // add a instance pointer to our lookup table keyed by the key
00062 extern "C" void ipt_helper_add_instance_pointer(const string *key,DynamicResource *instance)
00063 {
00064     __nsdl_lookup_table.add(*key,instance);
00065     if (key != NULL) delete key;
00066 }
00067 
00068 #endif // __INSTANCE_POINTER_TABLE_HELPER_H__