diff --git a/src/CTree.cpp b/src/CTree.cpp
new file mode 100644
index 0000000..994515a
--- /dev/null
+++ b/src/CTree.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2018 CESNET, https://photonics.cesnet.cz/
+ *
+ * Written by Václav Kubernát <kubervac@fit.cvut.cz>
+ *
+*/
+
+#include "CTree.hpp"
+
+InvalidNodeException::~InvalidNodeException() = default;
+
+std::string joinPaths(const std::string& prefix, const std::string& suffix)
+{
+    if (prefix.empty() || suffix.empty())
+        return prefix + suffix;
+    else
+        return prefix + '/' + suffix;
+}
+
+const std::unordered_set<std::string>& CTree::children(const std::string& node) const
+{
+    return m_nodes.at(node);
+}
+
+bool CTree::checkNode(const std::string& location, const std::string& node) const
+{
+    if (node == ".." || node.empty())
+        return true;
+    const auto& childrenRef = children(location); //first, get a reference to all children
+    if (childrenRef.find(node) == childrenRef.end()) { //find the desired node, if it isn't present throw an exception
+        throw InvalidNodeException(node);
+    }
+    return true;
+}
+void CTree::changeNode(const std::string& node)
+{
+    if (node.empty()) {
+        m_curDir = "";
+        return;
+    }
+    m_curDir += joinPaths(m_curDir, node);
+}
+std::string CTree::currentNode() const
+{
+    return m_curDir;
+}
+
+void CTree::addNode(const std::string& location, const std::string& name)
+{
+    m_nodes.at(location).insert(name);
+
+    //create a new set of children for the new node
+    m_nodes.emplace(joinPaths(location, name), std::unordered_set<std::string>());
+}
+void CTree::initDefault()
+{
+    m_nodes.emplace("", std::unordered_set<std::string>());
+    addNode("", "aaa");
+    addNode("", "bbb");
+    addNode("", "ccc");
+    addNode("aaa", "aaabbb");
+    addNode("aaa", "aaauuu");
+    addNode("bbb", "bbbuuu");
+}