Create child data node (part 1): CPS service + REST

Issue-ID: CPS-337
Change-Id: I9c5c62d144b5301ac80e2b82a5cc66a980dad011
Signed-off-by: Ruslan Kashapov <ruslan.kashapov@pantheon.tech>

3 files changed, 43 insertions, 0 deletions

diff --git a/cps-service/src/main/java/org/onap/cps/api/CpsDataService.java b/cps-service/src/main/java/org/onap/cps/api/CpsDataService.java
index 54d9258918..8552c6c0d8 100644
--- a/cps-service/src/main/java/org/onap/cps/api/CpsDataService.java
+++ b/cps-service/src/main/java/org/onap/cps/api/CpsDataService.java
@@ -22,6 +22,8 @@ package org.onap.cps.api;
 
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.onap.cps.spi.FetchDescendantsOption;
+import org.onap.cps.spi.exceptions.AlreadyDefinedException;
+import org.onap.cps.spi.exceptions.DataNodeNotFoundException;
 import org.onap.cps.spi.exceptions.DataValidationException;
 import org.onap.cps.spi.model.DataNode;
 
@@ -41,6 +43,20 @@ public interface CpsDataService {
     void saveData(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull String jsonData);
 
     /**
+     * Persists child data fragment under existing data node for the given anchor and dataspace.
+     *
+     * @param dataspaceName   dataspace name
+     * @param anchorName      anchor name
+     * @param parentNodeXpath parent node xpath
+     * @param jsonData        json data
+     * @throws DataValidationException   when json data is invalid
+     * @throws DataNodeNotFoundException when parent node cannot be found by parent node xpath
+     * @throws AlreadyDefinedException   when child data node with same xpath already exists
+     */
+    void saveData(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull String parentNodeXpath,
+        @NonNull String jsonData);
+
+    /**
      * Retrieves datanode by XPath for given dataspace and anchor.
      *
      * @param dataspaceName          dataspace name
diff --git a/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java b/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java
index 6f7d6439b6..cc290bf29d 100755
--- a/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java
+++ b/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java
@@ -59,6 +59,13 @@ public class CpsDataServiceImpl implements CpsDataService {
     }
 
     @Override
+    public void saveData(final String dataspaceName, final String anchorName, final String parentNodeXpath,
+        final String jsonData) {
+        final DataNode dataNode = buildDataNodeFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
+        cpsDataPersistenceService.addChildDataNode(dataspaceName, anchorName, parentNodeXpath, dataNode);
+    }
+
+    @Override
     public DataNode getDataNode(final String dataspaceName, final String anchorName, final String xpath,
         final FetchDescendantsOption fetchDescendantsOption) {
         return cpsDataPersistenceService.getDataNode(dataspaceName, anchorName, xpath, fetchDescendantsOption);
diff --git a/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy
index d561475273..29a2314a33 100644
--- a/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy
+++ b/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy
@@ -1,6 +1,7 @@
 /*
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2021 Nordix Foundation
+ *  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.
@@ -69,6 +70,25 @@ class CpsDataServiceImplSpec extends Specification {
                     { dataNode -> dataNode.xpath == '/test-tree' })
     }
 
+    def 'Saving child data fragment under existing node.'() {
+        given: 'that the admin service will return an anchor'
+            def anchor = Anchor.builder().name(anchorName).schemaSetName(schemaSetName).build()
+            mockCpsAdminService.getAnchor(dataspaceName, anchorName) >> anchor
+        and: 'the schema source set cache returns a schema source set'
+            def mockYangTextSchemaSourceSet = Mock(YangTextSchemaSourceSet)
+            mockYangTextSchemaSourceSetCache.get(dataspaceName, schemaSetName) >> mockYangTextSchemaSourceSet
+        and: 'the schema source sets returns the test-tree schema context'
+            def yangResourceNameToContent = TestUtils.getYangResourcesAsMap('test-tree.yang')
+            def schemaContext = YangTextSchemaSourceSetBuilder.of(yangResourceNameToContent).getSchemaContext()
+            mockYangTextSchemaSourceSet.getSchemaContext() >> schemaContext
+        when: 'save data method is invoked with test-tree json data'
+            def jsonData = '{"branch": [{"name": "New"}]}'
+            objectUnderTest.saveData(dataspaceName, anchorName, '/test-tree',jsonData)
+        then: 'the persistence service method is invoked with correct parameters'
+            1 * mockCpsDataPersistenceService.addChildDataNode(dataspaceName, anchorName,'/test-tree',
+                    { dataNode -> dataNode.xpath == '/test-tree/branch[@name=\'New\']' })
+    }
+
     @Unroll
     def 'Get data node with option #fetchDescendantsOption.'() {
         def xpath = '/xpath'