[ONOS-7732] Automating switch workflow: api, app, and sample workflows

Change-Id: Iee87d4fe6cf61c1f8904d1d77df5f913a712b64a
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelPointer.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelPointer.java
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+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelPointer.java
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+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.workflow.api;
+
+/**
+ * Common data model tree path.
+ */
+public interface DataModelPointer {
+
+    /**
+     * Workplace array pointer.
+     */
+    String WORKPLACES_PTR = "/workplaces";
+
+    /**
+     * Workplace name pointer.
+     */
+    String WORKPLACE_NAME_PTR = "/name";
+
+    /**
+     * Workplace data pointer.
+     */
+    String WORKPLACE_DATA_PTR = "/data";
+
+    /**
+     * Workplace workflow pointer.
+     */
+    String WORKPLACE_WORKFLOWS_PTR = "/workflows";
+
+    /**
+     * Workflow op pointer.
+     */
+    String WORKFLOW_OP_PTR = "/op";
+
+    /**
+     * Workflow id pointer.
+     */
+    String WORKFLOW_ID_PTR = "/id";
+
+    /**
+     * Workflow data pointer.
+     */
+    String WORKFLOW_DATA_PTR = "/data";
+
+    /**
+     * Gets path string.
+     * @return path string
+     */
+    String getPath();
+}
+