JSon helper routines

qgroundcontrol.pro

@@ -249,6 +249,7 @@ HEADERS += \
     src/HomePositionManager.h \
     src/Joystick/Joystick.h \
     src/Joystick/JoystickManager.h \
+    src/JsonHelper.h \
     src/LogCompressor.h \
     src/MG.h \
     src/MissionManager/MissionCommandList.h \
@@ -373,6 +374,7 @@ SOURCES += \
     src/HomePositionManager.cc \
     src/Joystick/Joystick.cc \
     src/Joystick/JoystickManager.cc \
+    src/JsonHelper.cc \
     src/LogCompressor.cc \
     src/main.cc \
     src/MissionManager/MissionCommandList.cc \

src/JsonHelper.cc

@@ -0,0 +1,73 @@
+/*===================================================================
+QGroundControl Open Source Ground Control Station
+
+(c) 2009, 2010 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+
+This file is part of the QGROUNDCONTROL project
+
+    QGROUNDCONTROL is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    QGROUNDCONTROL is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
+
+======================================================================*/
+
+#include "JsonHelper.h"
+
+#include <QJsonArray>
+
+bool JsonHelper::validateRequiredKeys(const QJsonObject& jsonObject, const QStringList& keys, QString& errorString)
+{
+    QString missingKeys;
+
+    foreach(const QString& key, keys) {
+        if (!jsonObject.contains(key)) {
+            if (!missingKeys.isEmpty()) {
+                missingKeys += QStringLiteral(", ");
+            }
+            missingKeys += key;
+        }
+    }
+
+    if (missingKeys.count() != 0) {
+        errorString = QString("The following required keys are missing: %1").arg(missingKeys);
+        return false;
+    }
+
+    return true;
+}
+
+bool JsonHelper::toQGeoCoordinate(const QJsonValue& jsonValue, QGeoCoordinate& coordinate, bool altitudeRequired, QString& errorString)
+{
+    if (!jsonValue.isArray()) {
+        errorString = QStringLiteral("JSon value for coordinate is not array");
+        return false;
+    }
+
+    QJsonArray coordinateArray = jsonValue.toArray();
+    int requiredCount = altitudeRequired ? 3 : 2;
+    if (coordinateArray.count() != requiredCount) {
+        errorString = QString("Json array must contains %1 values").arg(requiredCount);
+        return false;
+    }
+
+    coordinate = QGeoCoordinate(coordinateArray[0].toDouble(), coordinateArray[1].toDouble());
+    if (altitudeRequired) {
+        coordinate.setAltitude(coordinateArray[2].toDouble());
+    }
+
+    if (!coordinate.isValid()) {
+        errorString = QString("Coordinate is invalid: %1").arg(coordinate.toString());
+        return false;
+    }
+
+    return true;
+}

src/JsonHelper.h

@@ -0,0 +1,37 @@
+/*=====================================================================
+ 
+ QGroundControl Open Source Ground Control Station
+ 
+ (c) 2009 - 2014 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ 
+ This file is part of the QGROUNDCONTROL project
+ 
+ QGROUNDCONTROL is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+ 
+ QGROUNDCONTROL is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
+ 
+ ======================================================================*/
+
+#ifndef JsonHelper_H
+#define JsonHelper_H
+
+#include <QJsonObject>
+#include <QGeoCoordinate>
+
+class JsonHelper
+{
+public:
+    static bool validateRequiredKeys(const QJsonObject& jsonObject, const QStringList& keys, QString& errorString);
+    static bool toQGeoCoordinate(const QJsonValue& jsonValue, QGeoCoordinate& coordinate, bool altitudeRequired, QString& errorString);
+};
+
+#endif