[ONOS-3892] implement YANG leaf data model
Change-Id: I996d4d3d60a0ad2142e173c6ba26c9cc355ccc80
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangLeavesHolder.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangLeavesHolder.java
new file mode 100644
index 0000000..917d591
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+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangLeavesHolder.java
@@ -0,0 +1,54 @@
+/*Copyright 2016.year Open Networking Laboratory
+
+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.*/
+package org.onosproject.yangutils.datamodel;
+
+import java.util.List;
+
+/**
+ * Abstraction of atomic configurable/status entity. It is used to abstract the
+ * data holders of leaf or leaf list. Used in leaves parsing or attribute code
+ * generation.
+ */
+public interface YangLeavesHolder {
+
+ /**
+ * Get the list of leaves from data holder like container / list.
+ *
+ * @return the list of leaves.
+ */
+ @SuppressWarnings("rawtypes")
+ public List<YangLeaf> getListOfLeaf();
+
+ /**
+ * Add a leaf in data holder like container / list.
+ *
+ * @param leaf the leaf to be added.
+ */
+ void addLeaf(YangLeaf<?> leaf);
+
+ /**
+ * Get the list of leaf-list from data holder like container / list.
+ *
+ * @return the list of leaf-list.
+ */
+ @SuppressWarnings("rawtypes")
+ List<YangLeafList> getListOfLeafList();
+
+ /**
+ * Add a leaf-list in data holder like container / list.
+ *
+ * @param leafList the leaf-list to be added.
+ */
+ void addLeafList(YangLeafList<?> leafList);
+}