Replace list-node content (part 1): CPS Service and persistence layers

Issue-ID: CPS-362
Change-Id: I669c9fc6ef67c1992fe95e17a765f0c616b00f7e
Signed-off-by: Ruslan Kashapov <ruslan.kashapov@pantheon.tech>

4 files changed, 67 insertions, 4 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 8e59ebcbb0..3b50c51445 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
@@ -105,4 +105,18 @@ public interface CpsDataService {
      */
     void replaceNodeTree(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull String parentNodeXpath,
         @NonNull String jsonData);
+
+    /**
+     * Replaces (if exists) child data fragment representing list-node (with one or more elements)
+     * 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 representing list element
+     * @throws DataValidationException   when json data is invalid (incl. list-node being empty)
+     * @throws DataNodeNotFoundException when parent node cannot be found by parent node xpath
+     */
+    void replaceListNodeData(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull String parentNodeXpath,
+        @NonNull String jsonData);
 }
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 523657a7fc..23bf4f2ee9 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
@@ -71,9 +71,6 @@ public class CpsDataServiceImpl implements CpsDataService {
         final String parentNodeXpath, final String jsonData) {
         final Collection<DataNode> dataNodesCollection =
             buildDataNodeCollectionFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
-        if (dataNodesCollection.isEmpty()) {
-            throw new DataValidationException("Invalid list data.", "List node is empty.");
-        }
         cpsDataPersistenceService.addListDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodesCollection);
     }
 
@@ -98,6 +95,14 @@ public class CpsDataServiceImpl implements CpsDataService {
         cpsDataPersistenceService.replaceDataNodeTree(dataspaceName, anchorName, dataNode);
     }
 
+    @Override
+    public void replaceListNodeData(final String dataspaceName, final String anchorName, final String parentNodeXpath,
+        final String jsonData) {
+        final Collection<DataNode> dataNodes =
+            buildDataNodeCollectionFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
+        cpsDataPersistenceService.replaceListDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodes);
+    }
+
     private DataNode buildDataNodeFromJson(final String dataspaceName, final String anchorName,
         final String parentNodeXpath, final String jsonData) {
 
@@ -123,10 +128,15 @@ public class CpsDataServiceImpl implements CpsDataService {
         final var schemaContext = getSchemaContext(dataspaceName, anchor.getSchemaSetName());
 
         final NormalizedNode<?, ?> normalizedNode = YangUtils.parseJsonData(jsonData, schemaContext, parentNodeXpath);
-        return new DataNodeBuilder()
+        final Collection<DataNode> dataNodes = new DataNodeBuilder()
             .withParentNodeXpath(parentNodeXpath)
             .withNormalizedNodeTree(normalizedNode)
             .buildCollection();
+        if (dataNodes.isEmpty()) {
+            throw new DataValidationException("Invalid list data.", "List node is empty.");
+        }
+        return dataNodes;
+
     }
 
     private SchemaContext getSchemaContext(final String dataspaceName, final String schemaSetName) {
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 0ed3bf0051..3b16b0d813 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
@@ -101,6 +101,17 @@ public interface CpsDataPersistenceService {
     void replaceDataNodeTree(@NonNull String dataspaceName, @NonNull String anchorName, @NonNull DataNode dataNode);
 
     /**
+     * Replaces existing list data node content including descendants.
+     *
+     * @param dataspaceName   dataspace name
+     * @param anchorName      anchor name
+     * @param parentNodeXpath parent node xpath
+     * @param dataNodes       collection of data nodes representing list node elements
+     */
+    void replaceListDataNodes(@NonNull String dataspaceName, @NonNull String anchorName,
+        @NonNull String parentNodeXpath, @NonNull Collection<DataNode> dataNodes);
+
+    /**
      * Get a datanode by cps path.
      *
      * @param dataspaceName          dataspace name
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 5f930a1527..27a5a4e0ca 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
@@ -139,6 +139,34 @@ class CpsDataServiceImplSpec extends Specification {
             'level 2 node'   | '/test-tree'    | '{"branch": [{"name":"Name"}]}' || '/test-tree/branch[@name=\'Name\']'
     }
 
+    def 'Replace list-node data fragment under existing node.'() {
+        given: 'schema set for given anchor and dataspace references test-tree model'
+            setupSchemaSetMocks('test-tree.yang')
+        when: 'replace list data method is invoked with list-node json data'
+            def jsonData = '{"branch": [{"name": "A"}, {"name": "B"}]}'
+            objectUnderTest.replaceListNodeData(dataspaceName, anchorName, '/test-tree', jsonData)
+        then: 'the persistence service method is invoked with correct parameters'
+            1 * mockCpsDataPersistenceService.replaceListDataNodes(dataspaceName, anchorName, '/test-tree',
+                    { dataNodeCollection ->
+                        {
+                            assert dataNodeCollection.size() == 2
+                            assert dataNodeCollection.collect { it.getXpath() }
+                                    .containsAll(['/test-tree/branch[@name=\'A\']', '/test-tree/branch[@name=\'B\']'])
+                        }
+                    }
+            )
+    }
+
+    def 'Replace with empty list-node data fragment.'() {
+        given: 'schema set for given anchor and dataspace references test-tree model'
+            setupSchemaSetMocks('test-tree.yang')
+        when: 'replace list data method is invoked with empty list-node data fragment'
+            def jsonData = '{"branch": []}'
+            objectUnderTest.replaceListNodeData(dataspaceName, anchorName, '/test-tree', jsonData)
+        then: 'invalid data exception is thrown'
+            thrown(DataValidationException)
+    }
+
     def setupSchemaSetMocks(String... yangResources) {
         def anchor = Anchor.builder().name(anchorName).schemaSetName(schemaSetName).build()
         mockCpsAdminService.getAnchor(dataspaceName, anchorName) >> anchor