--- a
+++ b/lib/ChainOfResponsibility.cpp
@@ -0,0 +1,61 @@
+#include "../includes/ChainOfResponsibility.h"
+#include "../includes/Masking/Masking.h"
+#include <iostream>
+
+void Chain::addCommandByName(const std::string& name)
+{
+    if (name == "masking")
+    {
+        std::cout << "Adding masking command." << std::endl;
+
+        std::shared_ptr<Command> maskingCommand = std::make_shared<Masking>(std::shared_ptr<Chain>(this));
+        commandList.push_back(maskingCommand);
+    } 
+    else
+    {
+	    std::cout << "Wrong command type" << std::endl;
+    }
+}
+
+bool Chain::execute()
+{
+    if (commandList.size() == 0)
+    {
+        std::cout << "No command added yet. Exiting." << std::endl;
+        return false;
+    }
+
+    bool ok = true;
+
+    std::cout << "Starting execution." << std::endl;
+    for (std::shared_ptr<Command>& command : commandList)
+    {
+        ok = command->execute();
+        if (ok == false)
+        {
+            break;
+        }
+    }
+    return ok;
+}
+
+void Chain::setParameters(Parameters &params) { this->params = params; }
+Parameters Chain::getParameters() const { return params; }
+
+void Chain::setMask(sitk::Image &mask) { this->mask = mask; }
+sitk::Image Chain::getMask() const { return mask; }
+
+void Chain::setImage(sitk::Image &image) { this->image = image; }
+sitk::Image Chain::getImage() const { return image; }
+
+Parameters::Parameters()
+{
+    params["maskingStrategy"] = "rayCasting";
+    params["regularMaskingRegionGrowingSeedType"] = "center";
+    params["regularMaskingRegionGrowingLowerThreshold"] = "0";
+    params["regularMaskingRegionGrowingUpperThreshold"] = "80";
+}
+void Parameters::setParameter(std::string key, std::string value) { params[key] = value; }
+std::string Parameters::getValue(std::string key) { return params[key]; }
+void Parameters::validateParameters() {}
+