Added JsonObjectIterator

include/ArduinoJson/JsonObject.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
-#include "JsonContainer.hpp"
+#include "ArduinoJson/JsonContainer.hpp"
+#include "ArduinoJson/JsonObjectIterator.hpp"
 
 namespace ArduinoJson
 {
@@ -28,6 +29,13 @@ namespace ArduinoJson
             return _node && _node->isObject();
         }
 
+        JsonObjectIterator begin();
+
+        JsonObjectIterator end()
+        {
+            return JsonObjectIterator(0);
+        }
+
     private:
         Internals::JsonNode* getOrCreateNodeAt(const char* key);
     };

include/ArduinoJson/JsonObjectIterator.hpp

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "ArduinoJson/JsonObjectKeyValue.hpp"
+
+namespace ArduinoJson
+{
+	class JsonObject;
+
+	class JsonObjectIterator
+	{
+		friend class JsonObject;
+
+	public:
+		explicit JsonObjectIterator(Internals::JsonNode* node)
+			: _node(node)
+		{
+		}
+
+        const char* key() const
+        {
+            return operator*().key();
+        }
+
+        JsonValue value() const
+        {
+            return operator*().value();
+        }
+
+		void operator++()
+		{
+			_node = _node->next;
+		}
+
+		JsonObjectKeyValue operator*() const
+		{
+			return JsonObjectKeyValue(_node);
+		}
+
+		bool operator==(const JsonObjectIterator& other) const
+		{
+			return _node == other._node;
+		}
+
+		bool operator!=(const JsonObjectIterator& other) const
+		{
+			return _node != other._node;
+		}		
+
+	private:
+		Internals::JsonNode* _node;
+	};
+}

include/ArduinoJson/JsonObjectKeyValue.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "ArduinoJson/JsonValue.hpp"
+
+namespace ArduinoJson
+{
+	class JsonObjectKeyValue
+	{
+	public:
+		explicit JsonObjectKeyValue(Internals::JsonNode* node)
+			: _node(node)
+		{			
+		}
+
+		const char* key()
+		{
+			return _node->getAsObjectKey();
+		}
+
+		JsonValue value()
+		{
+			return JsonValue(_node->getAsObjectValue());
+		}
+
+	private:
+		Internals::JsonNode* _node;
+	};
+}

src/JsonObject.cpp

@@ -70,4 +70,9 @@ JsonNode* JsonObject::getOrCreateNodeAt(const char* key)
     addChild(newKeyNode);
 
     return newValueNode;
+}
+
+JsonObjectIterator JsonObject::begin()
+{
+    return JsonObjectIterator(_node->getContainerChild());
 }

test/JsonObject_Iterator_Tests.cpp

@@ -0,0 +1,27 @@
+#include <gtest/gtest.h>
+#include <ArduinoJson/JsonObject.hpp>
+#include <ArduinoJson/StaticJsonBuffer.hpp>
+
+using namespace ArduinoJson;
+
+TEST(JsonObject_Iterator_Test, SimpleTest)
+{
+	StaticJsonBuffer<42> jsonBuffer;
+
+	JsonObject object = jsonBuffer.createObject();
+	object["ab"] = 12;
+	object["cd"] = 34;
+
+	JsonObjectIterator it = object.begin();
+	JsonObjectIterator end = object.end();
+
+	EXPECT_NE(end, it);
+	EXPECT_STREQ("ab", it.key());
+	EXPECT_EQ(12, static_cast<int>(it.value()));
+	++it;
+	EXPECT_NE(end, it);
+	EXPECT_STREQ("cd", it.key());
+	EXPECT_EQ(34, static_cast<int>(it.value()));
+	++it;
+	EXPECT_EQ(object.end(), it);
+}