LocationResource.h

00001 /**
00002  * @file    LocationResource.h
00003  * @brief   mbed CoAP Endpoint Location resource supporting CoAP GET
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 __LOCATION_RESOURCE_H__
00024 #define __LOCATION_RESOURCE_H__
00025 
00026 // Base class
00027 #include "DynamicResource.h"
00028 
00029 // We have a static location by default - Moscone West - 37.783879,-122.4012538
00030 #define MY_LATITUDE     37.783879
00031 #define MY_LONGITUDE    -122.4012538
00032 #define MY_ALTITUDE     30.0
00033 #define MY_SPEED        0.0
00034 
00035 // Maximum Location JSON Length : {"latitude":XXX.YYYYYY, "longitude":XXX.YYYYYY, "msl":XXXXXX, "speed":XXXXXX}
00036 #define LOCATION_JSON_LENGTH  256
00037 char __location_json[LOCATION_JSON_LENGTH+1];
00038 
00039 /** LocationResource class
00040  */
00041 class LocationResource : public DynamicResource
00042 {
00043 public:
00044     /**
00045     Default constructor
00046     @param logger input logger instance for this resource
00047     @param name input the Location resource name
00048     @param observable input the resource is Observable (default: FALSE)
00049     */
00050     LocationResource(const Logger *logger,const char *name,const bool observable = false) : DynamicResource(logger,name,"Location",SN_GRS_GET_ALLOWED,observable) {
00051         memset(__location_json,0,LOCATION_JSON_LENGTH+1);
00052     }
00053 
00054     /**
00055     Get the value of the Location sensor
00056     @returns string containing the location value
00057     */
00058     virtual string get() {
00059         memset(__location_json,0,LOCATION_JSON_LENGTH);
00060         sprintf(__location_json,"{\"latitude\":%.6f,\"longitude\":%.6f,\"msl\":%.1f,\"speed\":%.1f}",
00061                     MY_LATITUDE,
00062                     MY_LONGITUDE,
00063                     MY_ALTITUDE,        // in meters
00064                     MY_SPEED);          // in meters/second
00065         return string(__location_json);
00066     }
00067 };
00068 
00069 #endif // __LOCATION_RESOURCE_H__