From 9dd4ddd23388d58b2093a2f59b62c3e14865a211 Mon Sep 17 00:00:00 2001
From: Sashi Penta <sashi.kumar.penta@intel.com>
Date: Fri, 26 Sep 2014 15:04:08 -0700
Subject: [PATCH] New APIs : hasAttribute, numberOfAttributes, erase in
 OCRepresentation.

Change-Id: Ia6df616bdd73d7e73a34563896dd3c5d941b9a8b
---
 examples/garageclient.cpp | 31 +++++++++++++++++++++++++++++--
 include/OCApi.h           | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/examples/garageclient.cpp b/examples/garageclient.cpp
index 08b98f0..813c06b 100644
--- a/examples/garageclient.cpp
+++ b/examples/garageclient.cpp
@@ -51,8 +51,35 @@ Garage myGarage;
 
 void printRepresentation(const OCRepresentation& rep)
 {
-        rep.getValue("state", myGarage.m_state);
-        rep.getValue("name", myGarage.m_name);
+
+        // Check if attribute "name" exists, and then getValue
+        if(rep.hasAttribute("name"))
+        {
+            myGarage.m_name = rep.getValue<std::string>("name");
+        }
+
+        // You can directly try to get the value. this function
+        // return false if there is no attribute "state"
+        if(!rep.getValue("state", myGarage.m_state))
+        {
+            std::cout << "Attribute state doesn't exist in the representation\n";
+        }
+
+
+        OCRepresentation rep2 = rep;
+
+        std::cout << "Number of attributes in rep2: "
+                  << rep2.numberOfAttributes() << std::endl;
+
+        if(rep2.erase("name"))
+        {
+            std::cout << "attribute: name, was removed successfully from rep2.\n";
+        }
+
+        std::cout << "Number of attributes in rep2: "
+                  << rep2.numberOfAttributes() << std::endl;
+
+
         rep.getValue("light", myGarage.m_lightRep);
 
         myGarage.m_lightRep.getValue("states", myGarage.m_lightStates);
diff --git a/include/OCApi.h b/include/OCApi.h
index 34a57af..a34d064 100644
--- a/include/OCApi.h
+++ b/include/OCApi.h
@@ -141,6 +141,11 @@ namespace OC
         public:
         OCRepresentation() {}
 
+        bool erase(const std::string& str)
+        {
+            return m_attributeMap.erase(str) != 0;
+        }
+
         std::string getUri(void) const
         {
             return m_uri;
@@ -152,6 +157,19 @@ namespace OC
         template <typename T>
         bool getValue(const std::string& str, T& val) const;
 
+        template <typename T>
+        T getValue(const std::string& str) const;
+
+        bool hasAttribute(const std::string& str) const
+        {
+            return m_attributeMap.find(str) != m_attributeMap.end();
+        }
+
+        int numberOfAttributes() const
+        {
+            return m_attributeMap.size();
+        }
+
         void setUri(std::string uri)
         {
             m_uri = uri;
@@ -525,6 +543,22 @@ namespace OC
         m_attributeMap[str] = getJSON(val);
     }
 
+    template <typename T>
+    T OCRepresentation::getValue(const std::string& str) const
+    {
+        T val;
+
+        auto x = m_attributeMap.find(str);
+
+        if(m_attributeMap.end() != x)
+        {
+            AttributeValue v = val;
+            parseJSON(v, x->second);
+            val = boost::get<T>(v);
+        }
+
+        return val;
+    }
 
     template <typename T>
     bool OCRepresentation::getValue(const std::string& str, T& val) const
-- 
2.7.4