Fetching data node by xpath - persistence layer

IssueID: CPS-71
Change-Id: I88f76cf36ef8a1e4ccbd4f1eac8867e93ed5be82
Signed-off-by: Ruslan Kashapov <ruslan.kashapov@pantheon.tech>

3 files changed, 53 insertions, 0 deletions

diff --git a/cps-service/src/main/java/org/onap/cps/spi/CpsDataPersistenceService.java b/cps-service/src/main/java/org/onap/cps/spi/CpsDataPersistenceService.java
index d59fa47467..97aecaafd1 100644
--- a/cps-service/src/main/java/org/onap/cps/spi/CpsDataPersistenceService.java
+++ b/cps-service/src/main/java/org/onap/cps/spi/CpsDataPersistenceService.java
@@ -1,6 +1,7 @@
 /*-
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2020 Nordix Foundation. All rights reserved.
+ *  Modifications Copyright (C) 2021 Pantheon.tech
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,4 +51,17 @@ public interface CpsDataPersistenceService {
      */
     void addChildDataNode(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull String parentXpath,
         @NonNull DataNode dataNode);
+
+    /**
+     * Retrieves datanode by XPath for given dataspace and anchor.
+     *
+     * @param dataspaceName          dataspace name
+     * @param anchorName             anchor name
+     * @param xpath                  xpath
+     * @param fetchDescendantsOption defines the scope of data to fetch: either single node or all the descendant nodes
+     *                               (recursively) as well
+     * @return data node object
+     */
+    DataNode getDataNode(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull String xpath,
+        @NonNull FetchDescendantsOption fetchDescendantsOption);
 }
diff --git a/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java b/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java
new file mode 100644
index 0000000000..0c994d8d7b
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/spi/FetchDescendantsOption.java
@@ -0,0 +1,25 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Pantheon.tech
+ *  ================================================================================
+ *  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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.spi;
+
+public enum FetchDescendantsOption {
+    OMIT_DESCENDANTS,
+    INCLUDE_ALL_DESCENDANTS
+}
diff --git a/cps-service/src/main/java/org/onap/cps/spi/model/DataNodeBuilder.java b/cps-service/src/main/java/org/onap/cps/spi/model/DataNodeBuilder.java
index d187f62e0f..67e93dd82b 100644
--- a/cps-service/src/main/java/org/onap/cps/spi/model/DataNodeBuilder.java
+++ b/cps-service/src/main/java/org/onap/cps/spi/model/DataNodeBuilder.java
@@ -1,6 +1,7 @@
 /*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  Modifications Copyright (C) 2021 Pantheon.tech
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -42,6 +43,7 @@ public class DataNodeBuilder {
 
     private NormalizedNode<?, ?> normalizedNodeTree;
     private String xpath;
+    private Map<String, Object> leaves = Collections.emptyMap();
     private Collection<DataNode> childDataNodes = Collections.emptySet();
 
 
@@ -68,6 +70,17 @@ public class DataNodeBuilder {
     }
 
     /**
+     * To use attributes for creating {@link DataNode}.
+     *
+     * @param leaves for the data node
+     * @return DataNodeBuilder
+     */
+    public DataNodeBuilder withLeaves(final Map<String, Object> leaves) {
+        this.leaves = leaves;
+        return this;
+    }
+
+    /**
      * To specify child nodes needs to be used while creating {@link DataNode}.
      *
      * @param childDataNodes to be added to the dataNode
@@ -96,6 +109,7 @@ public class DataNodeBuilder {
     private DataNode buildFromAttributes() {
         final DataNode dataNode = new DataNode();
         dataNode.setXpath(xpath);
+        dataNode.setLeaves(leaves);
         dataNode.setChildDataNodes(childDataNodes);
         return dataNode;
     }