Outline code for Restconf Api Call Node

Initial level implementation for Restconf api call node

Issue-ID: CCSDK-372

Change-Id: I9d77f4c7806b0e239a3ecb134424f4fc09d6865e
Signed-off-by: janani b <janani.b@huawei.com>

26 files changed, 1132 insertions, 82 deletions

diff --git a/restconf-client/provider/pom.xml b/restconf-client/provider/pom.xml
index 46e00009..8995f1dd 100755
--- a/restconf-client/provider/pom.xml
+++ b/restconf-client/provider/pom.xml
@@ -75,6 +75,24 @@
             <artifactId>yang-data-impl</artifactId>
             <version>2.0.3</version>
         </dependency>
-
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>dom4j</groupId>
+            <artifactId>dom4j</artifactId>
+            <version>1.6.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.7</version>
+        </dependency>
+        <dependency>
+            <groupId>org.onap.ccsdk.sli.plugins</groupId>
+            <artifactId>restapi-call-node-provider</artifactId>
+            <version>0.3.0-SNAPSHOT</version>
+        </dependency>
     </dependencies>
 </project>
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/Annotation.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/Annotation.java
index 7271c3d7..185f70ba 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/Annotation.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/Annotation.java
@@ -25,7 +25,14 @@ package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
  */
 public class Annotation {
 
+    /**
+     * Name of the annotation.
+     */
     private String name;
+
+    /**
+     * Value of the annotation.
+     */
     private String value;
 
     /**
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormat.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormat.java
index 6fb11e70..c692f1dd 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormat.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormat.java
@@ -24,6 +24,14 @@ package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
  * Representation of data format.
  */
 public enum DataFormat {
+
+    /**
+     * XML data format.
+     */
     XML,
+
+    /**
+     * JSON data format.
+     */
     JSON
 }
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializer.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializer.java
index e703b173..57280e2e 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializer.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializer.java
@@ -29,19 +29,26 @@ import java.util.Map;
  */
 public abstract class DataFormatSerializer {
 
+    /**
+     * Data format type of the serializer.
+     */
     private DataFormat dataFormat;
+
+    /**
+     * Data format serializer context.
+     */
     private DataFormatSerializerContext serializerContext;
 
     /**
      * Creates an instance of data format serializer.
      *
-     * @param dataFormat type of data format
-     * @param serializerContext data format serializer context
+     * @param d type of data format
+     * @param s data format serializer context
      */
-    protected DataFormatSerializer(DataFormat dataFormat,
-        DataFormatSerializerContext serializerContext) {
-        this.dataFormat = dataFormat;
-        this.serializerContext = serializerContext;
+    protected DataFormatSerializer(DataFormat d,
+                                   DataFormatSerializerContext s) {
+        this.dataFormat = d;
+        this.serializerContext = s;
     }
 
     /**
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializerContext.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializerContext.java
index e2ead53f..919e82af 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializerContext.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DataFormatSerializerContext.java
@@ -20,6 +20,8 @@
 
 package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
 
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNodeSerializer;
+
 import java.util.Map;
 
 /**
@@ -27,26 +29,45 @@ import java.util.Map;
  */
 public class DataFormatSerializerContext {
 
+    /**
+     * Data format listener.
+     */
     private Listener listener;
+
+    /**
+     * URI corresponding to the instance identifier.
+     */
     private String uri;
+
+    /**
+     * Protocol annotation.
+     */
     private Map<String, String> protocolAnnotation;
 
     /**
+     * Properties node serializer.
+     */
+    private PropertiesNodeSerializer propNodeSerializer;
+
+    /**
      * Creates an instance of data format serializer context.
      *
-     * @param listener data format listener
-     * @param uri URI corresponding to instance identifier
-     * @param protocolAnnotation protocol annotations
+     * @param l data format listener
+     * @param u URI corresponding to instance identifier
+     * @param p protocol annotations
+     * @param s properties node serializer
      */
-    public DataFormatSerializerContext(Listener listener, String uri,
-        Map<String, String> protocolAnnotation) {
-        this.listener = listener;
-        this.uri = uri;
-        this.protocolAnnotation = protocolAnnotation;
+    public DataFormatSerializerContext(Listener l, String u,
+                                       Map<String, String> p,
+                                       PropertiesNodeSerializer s) {
+        listener = l;
+        uri = u;
+        protocolAnnotation = p;
+        propNodeSerializer = s;
     }
 
     /**
-     * Retruns data format listener.
+     * Returns the data format listener.
      *
      * @return data format listener
      */
@@ -55,7 +76,7 @@ public class DataFormatSerializerContext {
     }
 
     /**
-     * Returns URI.
+     * Returns the URI.
      *
      * @return URI
      */
@@ -64,11 +85,20 @@ public class DataFormatSerializerContext {
     }
 
     /**
-     * Returns protocol annotations.
+     * Returns the protocol annotations.
      *
      * @return protocol annotations
      */
     public Map<String, String> getProtocolAnnotation() {
         return protocolAnnotation;
     }
+
+    /**
+     * Returns the properties node serializer.
+     *
+     * @return properties node serializer
+     */
+    public PropertiesNodeSerializer getPropNodeSerializer() {
+        return propNodeSerializer;
+    }
 }
\ No newline at end of file
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultJsonListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultJsonListener.java
new file mode 100644
index 00000000..5e71eea3
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultJsonListener.java
@@ -0,0 +1,71 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType;
+
+
+/**
+ * Representation of default implementation of JSON listener.
+ */
+public class DefaultJsonListener implements JsonListener {
+
+    /**
+     * Serializer helper to convert to properties node.
+     */
+    private SerializerHelper serializerHelper;
+
+    /**
+     * Name of the current JSON node.
+     */
+    private String name;
+
+    /**
+     * Module name of the current JSON node.
+     */
+    private String modName;
+
+    /**
+     * Creates an instance of default json listener with its serializer helper.
+     *
+     * @param serializerHelper serializer helper
+     */
+    public DefaultJsonListener(SerializerHelper serializerHelper) {
+        this.serializerHelper = serializerHelper;
+    }
+
+    @Override
+    public void enterJsonNode(String nodeName, JsonNode node, NodeType nodeType) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void exitJsonNode(JsonNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public SerializerHelper serializerHelper() {
+        return serializerHelper;
+    }
+
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultJsonWalker.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultJsonWalker.java
new file mode 100644
index 00000000..20d4fa77
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultJsonWalker.java
@@ -0,0 +1,60 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Implementation of JSON walker to walk through the nodes and process it.
+ */
+public class DefaultJsonWalker implements JsonWalker {
+
+    @Override
+    public void walk(JsonListener listener, JsonNode jsonNode) {
+        //TODO: Implementation code.
+    }
+
+    /**
+     * Processes single instance node or leaf, by adding the node to from
+     * JSON and walking through all its children recursively.
+     *
+     * @param key      JSON name
+     * @param value    JSON node
+     * @param listener JSON listener
+     */
+    private void processSingleNode(String key, JsonNode value,
+                                   JsonListener listener) {
+        //TODO: Implementation code.
+    }
+
+    /**
+     * Processes multi instance node or leaf, by adding the node to from JSON
+     * and walking through all its instance recursively.
+     *
+     * @param key      JSON name
+     * @param value    JSON node
+     * @param listener JSON listener
+     */
+    private void processMultiNodes(String key, JsonNode value,
+                                   JsonListener listener) {
+        //TODO: Implementation code.
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultXmlListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultXmlListener.java
new file mode 100644
index 00000000..7946d8d0
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultXmlListener.java
@@ -0,0 +1,58 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import org.dom4j.Element;
+
+/**
+ * Representation of default implementation of XML listener.
+ */
+public class DefaultXmlListener implements XmlListener {
+
+    /**
+     * Serializer helper to convert to properties node.
+     */
+    private SerializerHelper serializerHelper;
+
+    /**
+     * Creates an instance of default XML listener with its serializer helper.
+     *
+     * @param serializerHelper serializer helper
+     */
+    public DefaultXmlListener(SerializerHelper serializerHelper) {
+        this.serializerHelper = serializerHelper;
+    }
+
+    @Override
+    public void enterXmlElement(Element element, XmlNodeType nodeType) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void exitXmlElement(Element element) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public SerializerHelper serializerHelper() {
+        return serializerHelper;
+    }
+    }
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultXmlWalker.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultXmlWalker.java
new file mode 100644
index 00000000..cd2a3d49
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DefaultXmlWalker.java
@@ -0,0 +1,34 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import org.dom4j.Element;
+
+/**
+ * Implementation of XML walker to walk through the nodes and process it.
+ */
+public class DefaultXmlWalker implements XmlWalker {
+
+    @Override
+    public void walk(XmlListener listener, Element xmlElement) {
+        //TODO: Implementation code.
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DfListenerFactory.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DfListenerFactory.java
new file mode 100644
index 00000000..851f1b48
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DfListenerFactory.java
@@ -0,0 +1,74 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+/**
+ * Represents the data format listener factory which will return JSON or XML
+ * listener according to the serializer helper.
+ */
+public final class DfListenerFactory {
+
+    /**
+     * Returns the instance of the data format listener factory.
+     *
+     * @return instance of the data format listener factory
+     */
+    public static DfListenerFactory instance() {
+        return DfListenerFactory.LazyHolder.INSTANCE;
+    }
+
+    /**
+     * Bill pugh singleton pattern. Instance will not be instantiated until
+     * the lazy holder class is loaded via a call to the instance of method
+     * below.
+     */
+    private static class LazyHolder {
+        private static final DfListenerFactory INSTANCE =
+                new DfListenerFactory();
+    }
+
+    /**
+     * Returns the data format listener by deciding it based on the format of
+     * the parameter.
+     *
+     * @param serHelper serializer helper
+     * @param params    parameters
+     * @return data format listener
+     */
+    public Listener getListener(SerializerHelper serHelper,
+                                YangParameters params) {
+        Listener listener;
+        switch (params.format) {
+            case JSON:
+                listener = new DefaultJsonListener(serHelper);
+                break;
+
+            case XML:
+                listener = new DefaultXmlListener(serHelper);
+                break;
+
+            //TODO: DataFormat Exception code to be added.
+            default:
+                throw new IllegalArgumentException("In correct format");
+        }
+        return listener;
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DfSerializerFactory.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DfSerializerFactory.java
new file mode 100644
index 00000000..25b23fe2
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/DfSerializerFactory.java
@@ -0,0 +1,75 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+/**
+ * Represents the data format serializer factory which will return JSON or XML
+ * serializer according to the serializer context.
+ */
+public final class DfSerializerFactory {
+
+    /**
+     * Returns the instance of the data format serializer factory.
+     *
+     * @return instance of the data format serializer factory
+     */
+    public static DfSerializerFactory instance() {
+        return DfSerializerFactory.LazyHolder.INSTANCE;
+    }
+
+    /**
+     * Bill pugh singleton pattern. Instance will not be instantiated until
+     * the lazy holder class is loaded via a call to the instance of method
+     * below.
+     */
+    private static class LazyHolder {
+        private static final DfSerializerFactory INSTANCE =
+                new DfSerializerFactory();
+    }
+
+    /**
+     * Returns the data format serializer by deciding it based on the format of
+     * the parameter.
+     *
+     * @param serCtx serializer context
+     * @param params parameters
+     * @return data format serializer
+     */
+    public DataFormatSerializer getSerializer(DataFormatSerializerContext
+                                                      serCtx,
+                                YangParameters params) {
+        DataFormatSerializer serializer;
+        switch (params.format) {
+            case JSON:
+                serializer = new JsonSerializer(serCtx);
+                break;
+
+            case XML:
+                serializer = new XmlSerializer(serCtx);
+                break;
+
+            //TODO: DataFormat Exception code to be added.
+            default:
+                throw new IllegalArgumentException("In correct format");
+        }
+        return serializer;
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonListener.java
new file mode 100644
index 00000000..2a9220ac
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonListener.java
@@ -0,0 +1,51 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType;
+
+/**
+ * Abstraction of an entity which provides call back methods, which in turn
+ * are called by JSON walker while walking the JSON tree. This interface
+ * needs to be implemented by protocol, implementing listener based call
+ * while doing JSON walk.
+ */
+public interface JsonListener extends Listener {
+
+    /**
+     * Call back invoked during JSON node entry. All other related
+     * information can be obtained from the JSON node.
+     *
+     * @param nodeName JSON node name
+     * @param node     JSON node
+     * @param nodeType JSON node type
+     */
+    void enterJsonNode(String nodeName, JsonNode node, NodeType nodeType);
+
+    /**
+     * Call back invoked during JSON node exit. All the related information
+     * can be obtained from the JSON node.
+     *
+     * @param node JSON node
+     */
+    void exitJsonNode(JsonNode node);
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonSerializer.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonSerializer.java
index 6013664c..b562e71d 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonSerializer.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonSerializer.java
@@ -23,8 +23,11 @@ package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
 import java.util.List;
 import java.util.Map;
 
+import static org.onap.ccsdk.sli.plugins.yangserializers.dfserializer.DataFormat.JSON;
+
 /**
- * Representation of JSON serializer.
+ * Representation of JSON serializer which encodes properties to JSON and
+ * decodes properties from JSON with the data format serializer.
  */
 public class JsonSerializer extends DataFormatSerializer {
 
@@ -34,16 +37,19 @@ public class JsonSerializer extends DataFormatSerializer {
      * @param serializerContext data format serializer context
      */
     protected JsonSerializer(DataFormatSerializerContext serializerContext) {
-        super(DataFormat.JSON, serializerContext);
+        super(JSON, serializerContext);
     }
 
     @Override
-    public String encode(Map<String, String> param, Map<String, List<Annotation>> annotations) {
+    public String encode(Map<String, String> param,
+                         Map<String, List<Annotation>> annotations) {
+        //TODO: Implementation code.
         return null;
     }
 
     @Override
     public Map<String, String> decode(String dataFormatBody) {
+        //TODO: Implementation code.
         return null;
     }
 }
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonWalker.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonWalker.java
new file mode 100644
index 00000000..e3fb4d51
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/JsonWalker.java
@@ -0,0 +1,41 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Abstraction of an entity which provides interface for JSON walk. This
+ * interface serves as a common tool for anyone who needs to parse the JSON
+ * node with depth-first algorithm.
+ */
+public interface JsonWalker {
+
+    /**
+     * Walks the JSON data tree. Protocols implement JSON listener service
+     * and walks the JSON tree with input as implemented object. JSON walker
+     * provides call back to the implemented methods.
+     *
+     * @param listener JSON listener implemented by the protocol
+     * @param jsonNode root node of the JSON data tree
+     */
+    void walk(JsonListener listener, JsonNode jsonNode);
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/MdsalSerializerHelper.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/MdsalSerializerHelper.java
index 311fc2d6..1f8195e2 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/MdsalSerializerHelper.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/MdsalSerializerHelper.java
@@ -20,48 +20,70 @@
 
 package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
 
-import java.util.Map;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNode;
+import org.opendaylight.yangtools.yang.model.api.SchemaContext;
 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
 
 /**
- * Representation of MDSAL based schema helper.
+ * Representation of MDSAL based serializer helper, which adds properties
+ * node to the properties tree based on its types.
  */
-public class MdsalSerializerHelper extends SerializerHelper<SchemaNode> {
+public class MdsalSerializerHelper extends SerializerHelper<SchemaNode, SchemaContext> {
 
-    protected MdsalSerializerHelper(SchemaNode node, String uri) {
-        super(node, uri);
-    }
+    /**
+     * Current properties node.
+     */
+    private PropertiesNode propNode;
 
-    @Override
-    public SchemaNode getRootContext() {
-        return null;
+    /**
+     * Current schema node.
+     */
+    private SchemaNode curSchemaNode;
+
+
+    /**
+     * Creates MDSAL serializer helper with root schema node, schema context
+     * and URI.
+     *
+     * @param n schema node of the URI's last node
+     * @param c schema context
+     * @param u URI of the request
+     */
+    protected MdsalSerializerHelper(SchemaNode n, SchemaContext c,
+                                    String u) {
+        super(n, c, u);
     }
 
     @Override
-    public SchemaNode getCurContext() {
-        return null;
+    protected SchemaNode getSchemaNode() {
+        return schemaNode;
     }
 
     @Override
-    public SchemaNode getChildContext(SchemaNode schemaNode, String name, String namespace) {
-        return null;
+    protected SchemaContext getSchemaCtx() {
+        return schemaCtx;
     }
 
     @Override
-    public NodeType getNodeType(SchemaNode schemaNode) {
-        return null;
+    protected SchemaNode getCurSchema() {
+        return curSchemaNode;
     }
 
     @Override
-    public void addNode(String name, String namespace, String value, String valNamespace, NodeType type) {
+    protected void addNode(String name, String nameSpace, String value,
+                           String valNameSpace, NodeType type) {
+        //TODO: Implementation code.
     }
 
     @Override
-    public void exitNode() {
+    protected void exitNode() {
+        //TODO: Implementation code.
     }
 
     @Override
-    public Map<String, String> getProperties() {
+    protected PropertiesNode getPropertiesNode() {
+        //TODO: Implementation code.
         return null;
     }
 }
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/PropertiesNodeJsonListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/PropertiesNodeJsonListener.java
new file mode 100644
index 00000000..ec130673
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/PropertiesNodeJsonListener.java
@@ -0,0 +1,70 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import com.google.gson.stream.JsonWriter;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNode;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNodeListener;
+
+import java.io.Writer;
+
+/**
+ * Representation of JSON implementation of properties node listener.
+ */
+public class PropertiesNodeJsonListener implements PropertiesNodeListener{
+
+    /**
+     * JSON writer to write the JSON data format.
+     */
+    private JsonWriter jsonWriter;
+
+    /**
+     * Writer to write the JSON.
+     */
+    private Writer writer;
+
+    /**
+     * Creates the properties node JSON listener by instantiating and
+     * indenting the writer.
+     */
+    public PropertiesNodeJsonListener() {
+    }
+
+    @Override
+    public void start(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void end(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void enterPropertiesNode(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void exitPropertiesNode(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/PropertiesNodeXmlListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/PropertiesNodeXmlListener.java
new file mode 100644
index 00000000..cfc59ca1
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/PropertiesNodeXmlListener.java
@@ -0,0 +1,80 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import org.dom4j.Element;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNode;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNodeListener;
+
+import java.io.Writer;
+import java.util.Stack;
+
+/**
+ * Representation of XML implementation of properties node listener.
+ */
+public class PropertiesNodeXmlListener implements PropertiesNodeListener {
+
+    /**
+     * XML data from the element.
+     */
+    private String xmlData;
+
+    /**
+     * Root element of the XML document.
+     */
+    private Element rootElement;
+
+    /**
+     * Writer to write the XML.
+     */
+    private Writer writer;
+
+    /**
+     * XML element stack to store the elements.
+     */
+    private final Stack<Element> elementStack = new Stack<>();
+
+    /**
+     * Creates the properties node XML listener.
+     */
+    public PropertiesNodeXmlListener() {
+    }
+
+    @Override
+    public void start(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void end(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void enterPropertiesNode(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+
+    @Override
+    public void exitPropertiesNode(PropertiesNode node) {
+        //TODO: Implementation code.
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/SerializerHelper.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/SerializerHelper.java
index 4e6d2944..2466023f 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/SerializerHelper.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/SerializerHelper.java
@@ -20,74 +20,92 @@
 
 package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
 
-import java.util.Map;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType;
+import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNode;
 
 /**
  * Abstraction of an entity which helps the data format serializers to obtain
  * schema context details and to build properties from data.
  *
  * @param <T> type of schema node
+ * @param <P> type of schema context
  */
-public abstract class SerializerHelper<T> {
+public abstract class SerializerHelper<T, P> {
 
-    private T rootSchema;
-    private String rootURI;
+    /**
+     * Schema node of the last element in the URI.
+     */
+    protected T schemaNode;
 
-    protected SerializerHelper(T t, String uri) {
-        rootSchema = t;
-    }
+    /**
+     * Root schema context.
+     */
+    protected P schemaCtx;
+
+    /**
+     * Root URI.
+     */
+    protected String rootUri;
 
     /**
-     * Returns root schema context node.
+     * Creates an instance of the serializer helper with the schema node,
+     * schema context and the URI.
      *
-     * @return root schema context node
+     * @param t schema node
+     * @param p schema context
+     * @param u root URI
      */
-    protected abstract T getRootContext();
+    protected SerializerHelper(T t, P p, String u) {
+        schemaNode = t;
+        schemaCtx = p;
+        rootUri = u;
+    }
 
     /**
-     * Returns current schema context node.
+     * Returns schema node of the last element in the URI.
      *
-     * @return current schema context node
+     * @return schema node
      */
-    protected abstract T getCurContext();
+    protected abstract T getSchemaNode();
 
     /**
-     * Returns child schema context node.
+     * Returns the root schema context.
      *
-     * @return child schema context node
+     * @return schema context
      */
-    protected abstract T getChildContext(T t, String name, String namespace);
+    protected abstract P getSchemaCtx();
 
     /**
-     * Returns type of node
-     * @param t node
-     * @return node type
+     * Returns the current schema context node.
+     *
+     * @return current schema context node
      */
-    protected abstract NodeType getNodeType(T t);
+    protected abstract T getCurSchema();
 
     /**
-     * Adds a node to current tree.
+     * Adds a node to the properties node tree.
      *
-     * @param name name of node
-     * @param namespace namespace of node, it can be either module name or
-     * namespace, null indicates parent namespace
-     * @param value value of node, in case it's leaf/leaf-list node
-     * @param valNamespace value namespace for identityref, could be module
-     * name or namespace
-     * @param type type of node if known like in case of JSON
+     * @param name         name of the node
+     * @param nameSpace    name space of the node, it can be either module
+     *                     name or namespace; null indicates parent namespace
+     * @param value        value of the node; applicable for leaf/leaf-list node
+     * @param valNameSpace value namespace for identityref, could be module
+     *                     name or namespace
+     * @param type         type of node if known like in case of JSON
      */
-    protected abstract void addNode(String name, String namespace, String value,
-        String valNamespace, NodeType type);
+    protected abstract void addNode(String name, String nameSpace, String value,
+                                    String valNameSpace, NodeType type);
 
     /**
-     * Exits the node, in case if it's leaf node add to properties map.
+     * Exits the node, in case if it's leaf node then it adds to the properties
+     * map.
      */
     protected abstract void exitNode();
 
     /**
-     * Returns the properties built corresponding to data.
+     * Returns the built properties corresponding to the data.
      *
-     * @return properties map
+     * @return properties node.
      */
-    protected abstract Map<String, String> getProperties();
+    protected abstract PropertiesNode getPropertiesNode();
 }
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlListener.java
new file mode 100644
index 00000000..0fbf4c33
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlListener.java
@@ -0,0 +1,49 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import org.dom4j.Element;
+
+/**
+ * Abstraction of an entity which provides call back methods, which in turn
+ * are called by XML walker while walking the XML tree. This interface needs
+ * to be implemented by protocol implementing listener based call while doing
+ * XML walk.
+ */
+public interface XmlListener extends Listener {
+
+    /**
+     * Callback invoked during a node entry. All the related information
+     * about the node can be obtained from the element.
+     *
+     * @param element  current XML element
+     * @param nodeType node type of the element
+     */
+    void enterXmlElement(Element element, XmlNodeType nodeType);
+
+    /**
+     * Callback invoked during a node exit. All the related information about
+     * the node can be obtained from the element.
+     *
+     * @param element current xml element.
+     */
+    void exitXmlElement(Element element);
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/NodeType.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlNodeType.java
index ffa35e2b..7a6db3c8 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/NodeType.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlNodeType.java
@@ -21,11 +21,17 @@
 package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
 
 /**
- * Representation of type of data node.
+ * Represents the XML node type.
  */
-public enum NodeType {
-    SINGLE_INSTANCE,
-    MULTI_INSTANCE,
-    SINGLE_INSTANCE_LEAF,
-    MULTI_INSTANCE_LEAF
+public enum XmlNodeType {
+
+    /**
+     * Object XML node type.
+     */
+    OBJECT_NODE,
+
+    /**
+     * Text XML node type.
+     */
+    TEXT_NODE
 }
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlSerializer.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlSerializer.java
index 0cfb4d17..51647005 100644
--- a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlSerializer.java
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlSerializer.java
@@ -23,8 +23,11 @@ package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
 import java.util.List;
 import java.util.Map;
 
+import static org.onap.ccsdk.sli.plugins.yangserializers.dfserializer.DataFormat.XML;
+
 /**
- * Representation of XML serializer.
+ * Representation of XML serializer which encodes properties to XML and
+ * decodes properties from XML with the data format serializer.
  */
 public class XmlSerializer extends DataFormatSerializer {
 
@@ -34,16 +37,19 @@ public class XmlSerializer extends DataFormatSerializer {
      * @param serializerContext data format serializer context
      */
     protected XmlSerializer(DataFormatSerializerContext serializerContext) {
-        super(DataFormat.XML, serializerContext);
+        super(XML, serializerContext);
     }
 
     @Override
-    public String encode(Map<String, String> param, Map<String, List<Annotation>> annotations) {
+    public String encode(Map<String, String> param,
+                         Map<String, List<Annotation>> annotations) {
+        //TODO: Implementation code.
         return null;
     }
 
     @Override
     public Map<String, String> decode(String dataFormatBody) {
+        //TODO: Implementation code.
         return null;
     }
 }
\ No newline at end of file
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlWalker.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlWalker.java
new file mode 100644
index 00000000..6fed510a
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/XmlWalker.java
@@ -0,0 +1,41 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import org.dom4j.Element;
+
+/**
+ * Abstraction of an entity which provides interface for XML walk. This
+ * interface serves as a common tool for anyone who needs to parse the XML
+ * node with depth-first algorithm.
+ */
+public interface XmlWalker {
+
+    /**
+     * Walks the XML data tree. Protocols implement XML listener service and
+     * walks the XML tree with input as implemented object. XML walker
+     * provides call back to the implemented methods.
+     *
+     * @param listener   XML listener implemented by the protocol
+     * @param xmlElement root element of the XML data tree
+     */
+    void walk(XmlListener listener, Element xmlElement);
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/YangParameters.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/YangParameters.java
new file mode 100644
index 00000000..c94a2297
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/dfserializer/YangParameters.java
@@ -0,0 +1,41 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
+
+import org.onap.ccsdk.sli.plugins.restapicall.Parameters;
+
+/**
+ * Representation of the YANG parameters for the restconf api call node.
+ */
+public class YangParameters extends Parameters {
+
+    /**
+     * Creates an instance of the YANG parameters.
+     */
+    public YangParameters() {
+        super();
+    }
+
+    /**
+     * Directory path of the YANG file.
+     */
+    public String dirPath;
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/DefaultPropertiesNodeWalker.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/DefaultPropertiesNodeWalker.java
new file mode 100644
index 00000000..041210f2
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/DefaultPropertiesNodeWalker.java
@@ -0,0 +1,87 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.pnserializer;
+
+import java.util.Map;
+
+/**
+ * Implementation of properties node walker which helps in forming a new tree from properties node.
+ *
+ * @param <T> node child of properties node.
+ */
+public class DefaultPropertiesNodeWalker<T extends NodeChild> implements PropertiesNodeWalker {
+
+    @Override
+    public void walk(PropertiesNodeListener listener,
+                     PropertiesNode propertiesNode) {
+        listener.start(propertiesNode);
+        walkChildNode(listener, propertiesNode);
+        listener.end(propertiesNode);
+    }
+
+    /**
+     * Walks the children node from the parent node.
+     *
+     * @param listener properties node listener
+     * @param propertiesNode properties node
+     */
+    public void walkChildNode(PropertiesNodeListener listener,
+                              PropertiesNode propertiesNode) {
+        Map<String, T> children = getChildren(propertiesNode);
+        if (children != null) {
+            for (Map.Entry<String, T> entry : children.entrySet()) {
+                PropertiesNode node = ((PropertiesNode) entry.getValue());
+                listener.enterPropertiesNode(node);
+                walkChildNode(listener, node);
+                listener.exitPropertiesNode(node);
+            }
+        }
+    }
+
+    /**
+     * Returns the children node according to the property node type.
+     *
+     * @param value property node
+     * @return property node children
+     */
+    private Map<String,T> getChildren(PropertiesNode value) {
+        if (value instanceof RootNode) {
+            return ((RootNode) value).children();
+        }
+        switch (value.nodeType()) {
+            case SINGLE_INSTANCE_NODE:
+                return ((InnerNode) value).children();
+            case MULTI_INSTANCE_HOLDER_NODE:
+                return ((Map<String, T>) ((ListHolderNode) value).children());
+            case MULTI_INSTANCE_NODE:
+                return ((Map<String, T>) ((MultiInstanceNode) value)
+                        .children());
+            case MULTI_INSTANCE_LEAF_HOLDER_NODE:
+                return ((Map<String, T>) ((LeafListHolderNode) value)
+                        .children());
+            case SINGLE_INSTANCE_LEAF_NODE:
+            case MULTI_INSTANCE_LEAF_NODE:
+                return null;
+            default:
+                throw new IllegalArgumentException("No more types allowed");
+        }
+    }
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/PropertiesNodeListener.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/PropertiesNodeListener.java
new file mode 100644
index 00000000..5bf7fe9d
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/PropertiesNodeListener.java
@@ -0,0 +1,55 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.pnserializer;
+
+/**
+ * Abstraction of properties node listener.
+ */
+public interface PropertiesNodeListener {
+
+    /**
+     * Pre-configurations required before starting the walking.
+     *
+     * @param node properties node
+     */
+    void start(PropertiesNode node);
+
+    /**
+     * Post-configurations required after starting the walking.
+     *
+     * @param node properties node
+     */
+    void end(PropertiesNode node);
+
+    /**
+     * Enters the properties node.
+     *
+     * @param node properties node
+     */
+    void enterPropertiesNode(PropertiesNode node);
+
+    /**
+     * Enters the properties node.
+     *
+     * @param node properties node
+     */
+    void exitPropertiesNode(PropertiesNode node);
+}
diff --git a/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/PropertiesNodeWalker.java b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/PropertiesNodeWalker.java
new file mode 100644
index 00000000..48433e2b
--- /dev/null
+++ b/restconf-client/provider/src/main/java/org/onap/ccsdk/sli/plugins/yangserializers/pnserializer/PropertiesNodeWalker.java
@@ -0,0 +1,35 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.pnserializer;
+
+/**
+ * Abstraction of properties node walker
+ */
+public interface PropertiesNodeWalker {
+
+    /**
+     * Walks the properties node with the listener.
+     *
+     * @param listener properties node listener.
+     * @param propertiesNode properties node
+     */
+    void walk(PropertiesNodeListener listener, PropertiesNode propertiesNode);
+}