From f415ff5df5a78ed16cc57c8439cea0ddc71b92fc Mon Sep 17 00:00:00 2001
From: rzaitov <r-zaitov@yandex.ru>
Date: Mon, 11 Nov 2013 14:21:03 +0400
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---
 .../DependencyResolver/DependencyResolver.py  | 38 +++++++++++++++++++
 .../Core/DependencyResolver/Node.py           | 12 ++++++
 .../Core/DependencyResolver/__init__.py       |  1 +
 .../UnitTests/DependencyResolver/__init__.py  |  1 +
 .../DependencyResolver/test_resolver.py       | 31 +++++++++++++++
 5 files changed, 83 insertions(+)
 create mode 100644 scripts/TouchinBuild/Core/DependencyResolver/DependencyResolver.py
 create mode 100644 scripts/TouchinBuild/Core/DependencyResolver/Node.py
 create mode 100644 scripts/TouchinBuild/Core/DependencyResolver/__init__.py
 create mode 100644 scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/__init__.py
 create mode 100644 scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/test_resolver.py

diff --git a/scripts/TouchinBuild/Core/DependencyResolver/DependencyResolver.py b/scripts/TouchinBuild/Core/DependencyResolver/DependencyResolver.py
new file mode 100644
index 0000000..42dfbc2
--- /dev/null
+++ b/scripts/TouchinBuild/Core/DependencyResolver/DependencyResolver.py
@@ -0,0 +1,38 @@
+class DependencyResolver:
+	def __init__(self):
+		pass
+
+	def resolve(self, unresolved):
+		assert unresolved is not None
+		resolved = []
+
+		while len(unresolved) > 0:
+			node = unresolved[0]
+			self.resolveNode(node, resolved, unresolved, [])
+
+		return resolved
+
+	def resolveNode(self, node, resolved, unresolved, seen):
+		assert node is not None
+		assert resolved is not None
+		assert seen is not None
+
+		seen.append(node)
+
+		for dependency in node.edges:
+			if dependency not in resolved:
+				self.guardNotCircularReference(node, dependency, seen)
+				self.resolveNode(dependency, resolved, unresolved, seen)
+
+		resolved.append(node)
+		unresolved.remove(node)
+		seen.remove(node)
+
+	def guardNotCircularReference(self, start, dependency, seen):
+		assert start is not None
+		assert dependency is not None
+		assert seen is not None
+
+		if dependency in seen:
+			raise Exception('Circular reference detected: {0} -> {1}'.format(start.name, dependency.name))
+
diff --git a/scripts/TouchinBuild/Core/DependencyResolver/Node.py b/scripts/TouchinBuild/Core/DependencyResolver/Node.py
new file mode 100644
index 0000000..06e1726
--- /dev/null
+++ b/scripts/TouchinBuild/Core/DependencyResolver/Node.py
@@ -0,0 +1,12 @@
+class Node:
+	def __init__(self, name):
+		assert name is not None
+
+		self.name = name
+		self.edges = []
+
+	def addEdge(self, node):
+		assert node is not None
+		assert node not in self.edges
+
+		self.edges.append(node)
\ No newline at end of file
diff --git a/scripts/TouchinBuild/Core/DependencyResolver/__init__.py b/scripts/TouchinBuild/Core/DependencyResolver/__init__.py
new file mode 100644
index 0000000..cc31abc
--- /dev/null
+++ b/scripts/TouchinBuild/Core/DependencyResolver/__init__.py
@@ -0,0 +1 @@
+__author__ = 'rzaitov'
diff --git a/scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/__init__.py b/scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/__init__.py
new file mode 100644
index 0000000..cc31abc
--- /dev/null
+++ b/scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/__init__.py
@@ -0,0 +1 @@
+__author__ = 'rzaitov'
diff --git a/scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/test_resolver.py b/scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/test_resolver.py
new file mode 100644
index 0000000..23834c6
--- /dev/null
+++ b/scripts/TouchinBuild/Tests/UnitTests/DependencyResolver/test_resolver.py
@@ -0,0 +1,31 @@
+import unittest
+from Core.DependencyResolver.DependencyResolver import DependencyResolver
+from Core.DependencyResolver.Node import Node
+
+
+class TestDependencyResolver(unittest.TestCase):
+	def setUp(self):
+		self.resolver = DependencyResolver()
+
+	def test_OneConnectedness(self):
+		node1 = Node('node1')
+		node2 = Node('node2')
+
+		node3 = Node('node3')
+		node3.addEdge(node1)
+		node3.addEdge(node2)
+
+		node4 = Node('node4')
+		node4.addEdge(node3)
+		node4.addEdge(node1)
+
+		unresolved = [node4, node3, node2, node1]
+		resolved = self.resolver.resolve(unresolved)
+
+		self.assertEqual(4, len(resolved))
+
+		self.assertEqual(node1, resolved[0])
+		self.assertEqual(node2, resolved[1])
+		self.assertEqual(node3, resolved[2])
+		self.assertEqual(node4, resolved[3])
+