diff --git a/src/adl.cpp b/src/adl.cpp
new file mode 100644
index 0000000..57b3307
--- /dev/null
+++ b/src/adl.cpp
@@ -0,0 +1,243 @@
+#include <iostream>
+#include <algorithm>
+
+#include "adl.hpp"
+#include "adjacent.hpp"
+#include "nlsr.hpp"
+
+
+namespace nlsr {
+
+Adl::Adl()
+{
+}
+
+Adl::~Adl()
+{
+}
+
+static bool
+adjacent_compare(Adjacent& adj1, Adjacent& adj2)
+{
+  return adj1.getName() == adj2.getName();
+}
+
+int
+Adl::insert(Adjacent& adj)
+{
+  std::list<Adjacent>::iterator it = find(adj.getName());
+  if (it != m_adjList.end())
+  {
+    return -1;
+  }
+  m_adjList.push_back(adj);
+  return 0;
+}
+
+void
+Adl::addAdjacentsFromAdl(Adl& adl)
+{
+  for (std::list<Adjacent>::iterator it = adl.getAdjList().begin();
+       it != adl.getAdjList().end(); ++it)
+  {
+    insert((*it));
+  }
+}
+
+int
+Adl::updateAdjacentStatus(string adjName, int s)
+{
+  std::list<Adjacent>::iterator it = find(adjName);
+  if (it == m_adjList.end())
+  {
+    return -1;
+  }
+  (*it).setStatus(s);
+  return 0;
+}
+
+Adjacent
+Adl::getAdjacent(string adjName)
+{
+  Adjacent adj(adjName);
+  std::list<Adjacent>::iterator it = find(adjName);
+  if (it != m_adjList.end())
+  {
+    return (*it);
+  }
+  return adj;
+}
+
+
+bool
+Adl::isEqual(Adl& adl)
+{
+  if (getSize() != adl.getSize())
+  {
+    return false;
+  }
+  m_adjList.sort(adjacent_compare);
+  adl.getAdjList().sort(adjacent_compare);
+  int equalAdjCount = 0;
+  std::list<Adjacent> adjList2 = adl.getAdjList();
+  std::list<Adjacent>::iterator it1;
+  std::list<Adjacent>::iterator it2;
+  for (it1 = m_adjList.begin(), it2 = adjList2.begin();
+       it1 != m_adjList.end(); it1++, it2++)
+  {
+    if (!(*it1).isEqual((*it2)))
+    {
+      break;
+    }
+    equalAdjCount++;
+  }
+  return equalAdjCount == getSize();
+}
+
+
+int
+Adl::updateAdjacentLinkCost(string adjName, double lc)
+{
+  std::list<Adjacent>::iterator it = find(adjName);
+  if (it == m_adjList.end())
+  {
+    return -1;
+  }
+  (*it).setLinkCost(lc);
+  return 0;
+}
+
+bool
+Adl::isNeighbor(string adjName)
+{
+  std::list<Adjacent>::iterator it = find(adjName);
+  if (it == m_adjList.end())
+  {
+    return false;
+  }
+  return true;
+}
+
+void
+Adl::incrementTimedOutInterestCount(string& neighbor)
+{
+  std::list<Adjacent>::iterator it = find(neighbor);
+  if (it == m_adjList.end())
+  {
+    return ;
+  }
+  (*it).setInterestTimedOutNo((*it).getInterestTimedOutNo() + 1);
+}
+
+void
+Adl::setTimedOutInterestCount(string& neighbor, int count)
+{
+  std::list<Adjacent>::iterator it = find(neighbor);
+  if (it != m_adjList.end())
+  {
+    (*it).setInterestTimedOutNo(count);
+  }
+}
+
+int
+Adl::getTimedOutInterestCount(string& neighbor)
+{
+  std::list<Adjacent>::iterator it = find(neighbor);
+  if (it == m_adjList.end())
+  {
+    return -1;
+  }
+  return (*it).getInterestTimedOutNo();
+}
+
+int
+Adl::getStatusOfNeighbor(string& neighbor)
+{
+  std::list<Adjacent>::iterator it = find(neighbor);
+  if (it == m_adjList.end())
+  {
+    return -1;
+  }
+  return (*it).getStatus();
+}
+
+void
+Adl::setStatusOfNeighbor(string& neighbor, int status)
+{
+  std::list<Adjacent>::iterator it = find(neighbor);
+  if (it != m_adjList.end())
+  {
+    (*it).setStatus(status);
+  }
+}
+
+std::list<Adjacent>&
+Adl::getAdjList()
+{
+  return m_adjList;
+}
+
+bool
+Adl::isAdjLsaBuildable(Nlsr& pnlsr)
+{
+  uint32_t nbrCount = 0;
+  for (std::list<Adjacent>::iterator it = m_adjList.begin();
+       it != m_adjList.end() ; it++)
+  {
+    if (((*it).getStatus() == 1))
+    {
+      nbrCount++;
+    }
+    else
+    {
+      if ((*it).getInterestTimedOutNo() >=
+          pnlsr.getConfParameter().getInterestRetryNumber())
+      {
+        nbrCount++;
+      }
+    }
+  }
+  if (nbrCount == m_adjList.size())
+  {
+    return true;
+  }
+  return false;
+}
+
+int
+Adl::getNumOfActiveNeighbor()
+{
+  int actNbrCount = 0;
+  for (std::list<Adjacent>::iterator it = m_adjList.begin();
+       it != m_adjList.end(); it++)
+  {
+    if (((*it).getStatus() == 1))
+    {
+      actNbrCount++;
+    }
+  }
+  return actNbrCount;
+}
+
+std::list<Adjacent>::iterator
+Adl::find(std::string adjName)
+{
+  Adjacent adj(adjName);
+  std::list<Adjacent>::iterator it = std::find_if(m_adjList.begin(),
+                                                  m_adjList.end(),
+                                                  bind(&adjacent_compare, _1, adj));
+  return it;
+}
+
+// used for debugging purpose
+void
+Adl::printAdl()
+{
+  for (std::list<Adjacent>::iterator it = m_adjList.begin();
+       it != m_adjList.end(); it++)
+  {
+    cout << (*it) << endl;
+  }
+}
+
+} //namespace nlsr