[ONOS-5080] YANG object builder coding

Change-Id: Ibef332b58f197a2f6626ee9b6d791b80002e2dfd
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java
new file mode 100644
index 0000000..2fc1343
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/yob/YobConstants.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2016-present 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.yms.app.yob;
+
+/**
+ * Represents common constant utility for YANG object builder.
+ */
+final class YobConstants {
+    private YobConstants() {
+    }
+
+    static final String FROM_STRING = "fromString";
+    static final String BUILD = "build";
+    static final String OP_PARAM = "OpParam";
+    static final String DEFAULT = "Default";
+    static final String ADD_TO = "addTo";
+    static final String VALUE_OF = "valueOf";
+    static final String OPERATION_TYPE = "onosYangNodeOperationType";
+    static final String OP_TYPE = "OnosYangNodeOperationType";
+    static final String OF = "of";
+    static final String PERIOD = ".";
+    static final String NO_HANDLE_FOR_YDT = "No handler for YDT node";
+    static final String HAS_NO_CHILD = " does not have child ";
+    static final String SET_OP_TYPE_FAIL = "Failed to set Operation Type";
+    static final String FAIL_TO_BUILD = "Failed to build the object ";
+    static final String FAIL_TO_GET_FIELD = "Failed to get field for class ";
+    static final String FAIL_TO_GET_METHOD = "Failed to get method for class ";
+    static final String FAIL_TO_LOAD_CLASS = "Failed to load class for class ";
+    static final String YDT_TYPE_IS_NOT_SUPPORT =
+            "Given YDT type is not supported.";
+    static final String FAIL_TO_CREATE_OBJ =
+            "Failed to create an object for class ";
+    static final String REFLECTION_FAIL_TO_CREATE_OBJ =
+            "Reflection failed to create an object for class ";
+    static final String FAIL_TO_LOAD_CONSTRUCTOR =
+            "Failed to load constructor for class ";
+    static final String FAIL_TO_INVOKE_METHOD =
+            "Failed to invoke method for class ";
+    static final String DATA_TYPE_NOT_SUPPORT =
+            "Given data type is not supported.";
+    static final String OBJ_IS_ALREADY_BUILT_NOT_FETCH =
+            "Object is already built, cannot fetch builder";
+    static final String BUILDER_IS_NOT_SET =
+            "Builder is not yet set, cannot fetch it";
+    static final String BUILT_OBJ_IS_NOT_SET =
+            "Built object is not set";
+    static final String OBJ_IS_NOT_SET_NOT_FETCH =
+            "Builder is not yet set, cannot fetch it";
+    static final String OBJ_IS_ALREADY_BUILT_NOT_BUILD =
+            "Object is already built, cannot build again";
+    static final String OBJ_BUILDING_WITHOUT_BUILDER =
+            "Object building without builder";
+}