added support for XML reading/writing

new serialization interfaces
new helper methods
new wifi models

sensors/radio/model/WiFiModelFactoryImpl.h

@@ -0,0 +1,42 @@
+#ifndef WIFIMODELFACTORYIMPL_H
+#define WIFIMODELFACTORYIMPL_H
+
+#include "WiFiModelFactory.h"
+#include "WiFiModelLogDist.h"
+#include "WiFiModelLogDistCeiling.h"
+#include "WiFiModelPerFloor.h"
+#include "WiFiModelPerBBox.h"
+
+WiFiModel* WiFiModelFactory::loadXML(const std::string& file) {
+
+	XMLDoc doc;
+	XMLserialize::assertOK(doc.LoadFile(file.c_str()), doc, "error while loading file");
+	XMLElem* root = doc.FirstChildElement("root");
+
+	return readFromXML(&doc, root);
+
+}
+
+WiFiModel* WiFiModelFactory::readFromXML(XMLDoc* doc, XMLElem* src) {
+
+	// each model attaches its "type" during serialization
+	const std::string type = src->Attribute("type");
+
+	WiFiModel* mdl = nullptr;
+
+	// create an instance for the model
+	if		(type == "WiFiModelLogDist")		{mdl = new WiFiModelLogDist();}
+	else if	(type == "WiFiModelLogDistCeiling")	{mdl = new WiFiModelLogDistCeiling(map);}
+	else if	(type == "WiFiModelPerFloor")		{mdl = new WiFiModelPerFloor(map);}
+	else if	(type == "WiFiModelPerBBox")		{mdl = new WiFiModelPerBBox(map);}
+	else										{throw Exception("invalid model type given: " + type);}
+
+	// load the model from XML
+	mdl->readFromXML(doc, src);
+
+	// done
+	return  mdl;
+
+}
+
+#endif // WIFIMODELFACTORYIMPL_H