XML content on create anchors node support

Add XML content type support on anchor node creation.

Issue-ID: CPS-1257
Change-Id: I7e7a9a1961b6e81de93a4e32e842b47f8a163a09
Signed-off-by: Michal Jagiello <michal.jagiello@t-mobile.pl>
Signed-off-by: Lee Anjella Macabuhay <lee.anjella.macabuhay@est.tech>

5 files changed, 392 insertions, 49 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 b2e8c5ba4..012d7f825 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
@@ -3,6 +3,7 @@
  *  Copyright (C) 2020-2022 Nordix Foundation
  *  Modifications Copyright (C) 2021 Pantheon.tech
  *  Modifications Copyright (C) 2021-2022 Bell Canada
+ *  Modifications Copyright (C) 2022 Deutsche Telekom AG
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -27,6 +28,7 @@ import java.util.Collection;
 import java.util.Map;
 import org.onap.cps.spi.FetchDescendantsOption;
 import org.onap.cps.spi.model.DataNode;
+import org.onap.cps.utils.ContentType;
 
 /*
  * Datastore interface for handling CPS data.
@@ -38,10 +40,22 @@ public interface CpsDataService {
      *
      * @param dataspaceName dataspace name
      * @param anchorName    anchor name
-     * @param jsonData      json data
+     * @param nodeData      node data
      * @param observedTimestamp observedTimestamp
      */
-    void saveData(String dataspaceName, String anchorName, String jsonData, OffsetDateTime observedTimestamp);
+    void saveData(String dataspaceName, String anchorName, String nodeData, OffsetDateTime observedTimestamp);
+
+    /**
+     * Persists data for the given anchor and dataspace.
+     *
+     * @param dataspaceName dataspace name
+     * @param anchorName    anchor name
+     * @param nodeData      node data
+     * @param observedTimestamp observedTimestamp
+     * @param contentType       node data content type
+     */
+    void saveData(String dataspaceName, String anchorName, String nodeData, OffsetDateTime observedTimestamp,
+                  ContentType contentType);
 
     /**
      * Persists child data fragment under existing data node for the given anchor and dataspace.
@@ -49,11 +63,25 @@ public interface CpsDataService {
      * @param dataspaceName   dataspace name
      * @param anchorName      anchor name
      * @param parentNodeXpath parent node xpath
-     * @param jsonData        json data
+     * @param nodeData        node data
      * @param observedTimestamp observedTimestamp
      */
-    void saveData(String dataspaceName, String anchorName, String parentNodeXpath, String jsonData,
-        OffsetDateTime observedTimestamp);
+    void saveData(String dataspaceName, String anchorName, String parentNodeXpath, String nodeData,
+                  OffsetDateTime observedTimestamp);
+
+    /**
+     * Persists child data fragment under existing data node for the given anchor, dataspace and content type.
+     *
+     * @param dataspaceName     dataspace name
+     * @param anchorName        anchor name
+     * @param parentNodeXpath   parent node xpath
+     * @param nodeData          node data
+     * @param observedTimestamp observedTimestamp
+     * @param contentType       node data content type
+     *
+     */
+    void saveData(String dataspaceName, String anchorName, String parentNodeXpath, String nodeData,
+                  OffsetDateTime observedTimestamp, ContentType contentType);
 
     /**
      * Persists child data fragment representing one or more list elements under existing data node for the
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 732b49499..c776e5bb3 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
@@ -4,6 +4,7 @@
  *  Modifications Copyright (C) 2020-2022 Bell Canada.
  *  Modifications Copyright (C) 2021 Pantheon.tech
  *  Modifications Copyright (C) 2022 TechMahindra Ltd.
+ *  Modifications Copyright (C) 2022 Deutsche Telekom AG
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -46,6 +47,7 @@ import org.onap.cps.spi.model.Anchor;
 import org.onap.cps.spi.model.DataNode;
 import org.onap.cps.spi.model.DataNodeBuilder;
 import org.onap.cps.spi.utils.CpsValidator;
+import org.onap.cps.utils.ContentType;
 import org.onap.cps.utils.YangUtils;
 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
@@ -66,21 +68,34 @@ public class CpsDataServiceImpl implements CpsDataService {
     private final CpsValidator cpsValidator;
 
     @Override
-    public void saveData(final String dataspaceName, final String anchorName, final String jsonData,
+    public void saveData(final String dataspaceName, final String anchorName, final String nodeData,
         final OffsetDateTime observedTimestamp) {
+        saveData(dataspaceName, anchorName, nodeData, observedTimestamp, ContentType.JSON);
+    }
+
+    @Override
+    public void saveData(final String dataspaceName, final String anchorName, final String nodeData,
+                         final OffsetDateTime observedTimestamp, final ContentType contentType) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<DataNode> dataNodes =
-                buildDataNodes(dataspaceName, anchorName, ROOT_NODE_XPATH, jsonData);
+                buildDataNodes(dataspaceName, anchorName, ROOT_NODE_XPATH, nodeData, contentType);
         cpsDataPersistenceService.storeDataNodes(dataspaceName, anchorName, dataNodes);
         processDataUpdatedEventAsync(dataspaceName, anchorName, ROOT_NODE_XPATH, CREATE, observedTimestamp);
     }
 
     @Override
     public void saveData(final String dataspaceName, final String anchorName, final String parentNodeXpath,
-        final String jsonData, final OffsetDateTime observedTimestamp) {
+                         final String nodeData, final OffsetDateTime observedTimestamp) {
+        saveData(dataspaceName, anchorName, parentNodeXpath, nodeData, observedTimestamp, ContentType.JSON);
+    }
+
+    @Override
+    public void saveData(final String dataspaceName, final String anchorName, final String parentNodeXpath,
+                         final String nodeData, final OffsetDateTime observedTimestamp,
+                         final ContentType contentType) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<DataNode> dataNodes =
-                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData);
+                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, nodeData, contentType);
         cpsDataPersistenceService.addChildDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodes);
         processDataUpdatedEventAsync(dataspaceName, anchorName, parentNodeXpath, CREATE, observedTimestamp);
     }
@@ -90,7 +105,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         final String parentNodeXpath, final String jsonData, final OffsetDateTime observedTimestamp) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<DataNode> listElementDataNodeCollection =
-            buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData);
+            buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData, ContentType.JSON);
         cpsDataPersistenceService.addListElements(dataspaceName, anchorName, parentNodeXpath,
             listElementDataNodeCollection);
         processDataUpdatedEventAsync(dataspaceName, anchorName, parentNodeXpath, UPDATE, observedTimestamp);
@@ -101,7 +116,7 @@ public class CpsDataServiceImpl implements CpsDataService {
             final Collection<String> jsonDataList, final OffsetDateTime observedTimestamp) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<Collection<DataNode>> listElementDataNodeCollections =
-                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonDataList);
+                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonDataList, ContentType.JSON);
         cpsDataPersistenceService.addMultipleLists(dataspaceName, anchorName, parentNodeXpath,
                 listElementDataNodeCollections);
         processDataUpdatedEventAsync(dataspaceName, anchorName, parentNodeXpath, UPDATE, observedTimestamp);
@@ -118,7 +133,7 @@ public class CpsDataServiceImpl implements CpsDataService {
     public void updateNodeLeaves(final String dataspaceName, final String anchorName, final String parentNodeXpath,
         final String jsonData, final OffsetDateTime observedTimestamp) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
-        final DataNode dataNode = buildDataNode(dataspaceName, anchorName, parentNodeXpath, jsonData);
+        final DataNode dataNode = buildDataNode(dataspaceName, anchorName, parentNodeXpath, jsonData, ContentType.JSON);
         cpsDataPersistenceService
             .updateDataLeaves(dataspaceName, anchorName, dataNode.getXpath(), dataNode.getLeaves());
         processDataUpdatedEventAsync(dataspaceName, anchorName, parentNodeXpath, UPDATE, observedTimestamp);
@@ -132,7 +147,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<DataNode> dataNodeUpdates =
             buildDataNodes(dataspaceName, anchorName,
-                parentNodeXpath, dataNodeUpdatesAsJson);
+                parentNodeXpath, dataNodeUpdatesAsJson, ContentType.JSON);
         for (final DataNode dataNodeUpdate : dataNodeUpdates) {
             processDataNodeUpdate(dataspaceName, anchorName, dataNodeUpdate);
         }
@@ -166,7 +181,7 @@ public class CpsDataServiceImpl implements CpsDataService {
                                              final OffsetDateTime observedTimestamp) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<DataNode> dataNodes =
-                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData);
+                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData, ContentType.JSON);
         final ArrayList<DataNode> nodes = new ArrayList<>(dataNodes);
         cpsDataPersistenceService.updateDataNodesAndDescendants(dataspaceName, anchorName, nodes);
         processDataUpdatedEventAsync(dataspaceName, anchorName, parentNodeXpath, UPDATE, observedTimestamp);
@@ -189,7 +204,7 @@ public class CpsDataServiceImpl implements CpsDataService {
             final String jsonData, final OffsetDateTime observedTimestamp) {
         cpsValidator.validateNameCharacters(dataspaceName, anchorName);
         final Collection<DataNode> newListElements =
-                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData);
+                buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData, ContentType.JSON);
         replaceListContent(dataspaceName, anchorName, parentNodeXpath, newListElements, observedTimestamp);
     }
 
@@ -226,18 +241,20 @@ public class CpsDataServiceImpl implements CpsDataService {
     }
 
     private DataNode buildDataNode(final String dataspaceName, final String anchorName,
-                                   final String parentNodeXpath, final String jsonData) {
+                                   final String parentNodeXpath, final String nodeData,
+                                   final ContentType contentType) {
 
         final Anchor anchor = cpsAdminService.getAnchor(dataspaceName, anchorName);
         final SchemaContext schemaContext = getSchemaContext(dataspaceName, anchor.getSchemaSetName());
 
         if (ROOT_NODE_XPATH.equals(parentNodeXpath)) {
-            final ContainerNode containerNode = YangUtils.parseJsonData(jsonData, schemaContext);
+            final ContainerNode containerNode = YangUtils.parseData(contentType, nodeData, schemaContext);
             return new DataNodeBuilder().withContainerNode(containerNode).build();
         }
 
         final ContainerNode containerNode = YangUtils
-                .parseJsonData(jsonData, schemaContext, parentNodeXpath);
+                .parseData(contentType, nodeData, schemaContext, parentNodeXpath);
+
         return new DataNodeBuilder()
                 .withParentNodeXpath(parentNodeXpath)
                 .withContainerNode(containerNode)
@@ -248,18 +265,19 @@ public class CpsDataServiceImpl implements CpsDataService {
                                           final Map<String, String> nodesJsonData) {
         return nodesJsonData.entrySet().stream().map(nodeJsonData ->
             buildDataNode(dataspaceName, anchorName, nodeJsonData.getKey(),
-                nodeJsonData.getValue())).collect(Collectors.toList());
+                nodeJsonData.getValue(), ContentType.JSON)).collect(Collectors.toList());
     }
 
     private Collection<DataNode> buildDataNodes(final String dataspaceName,
                                                 final String anchorName,
                                                 final String parentNodeXpath,
-                                                final String jsonData) {
+                                                final String nodeData,
+                                                final ContentType contentType) {
 
         final Anchor anchor = cpsAdminService.getAnchor(dataspaceName, anchorName);
         final SchemaContext schemaContext = getSchemaContext(dataspaceName, anchor.getSchemaSetName());
         if (ROOT_NODE_XPATH.equals(parentNodeXpath)) {
-            final ContainerNode containerNode = YangUtils.parseJsonData(jsonData, schemaContext);
+            final ContainerNode containerNode = YangUtils.parseData(contentType, nodeData, schemaContext);
             final Collection<DataNode> dataNodes = new DataNodeBuilder()
                     .withContainerNode(containerNode)
                     .buildCollection();
@@ -268,7 +286,7 @@ public class CpsDataServiceImpl implements CpsDataService {
             }
             return dataNodes;
         }
-        final ContainerNode containerNode = YangUtils.parseJsonData(jsonData, schemaContext, parentNodeXpath);
+        final ContainerNode containerNode = YangUtils.parseData(contentType, nodeData, schemaContext, parentNodeXpath);
         final Collection<DataNode> dataNodes = new DataNodeBuilder()
             .withParentNodeXpath(parentNodeXpath)
             .withContainerNode(containerNode)
@@ -281,9 +299,9 @@ public class CpsDataServiceImpl implements CpsDataService {
     }
 
     private Collection<Collection<DataNode>> buildDataNodes(final String dataspaceName, final String anchorName,
-            final String parentNodeXpath, final Collection<String> jsonDataList) {
-        return jsonDataList.stream()
-                .map(jsonData -> buildDataNodes(dataspaceName, anchorName, parentNodeXpath, jsonData))
+            final String parentNodeXpath, final Collection<String> nodeDataList, final ContentType contentType) {
+        return nodeDataList.stream()
+                .map(nodeData -> buildDataNodes(dataspaceName, anchorName, parentNodeXpath, nodeData, contentType))
                 .collect(Collectors.toList());
     }
 
diff --git a/cps-service/src/main/java/org/onap/cps/utils/ContentType.java b/cps-service/src/main/java/org/onap/cps/utils/ContentType.java
new file mode 100644
index 000000000..f88850484
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/utils/ContentType.java
@@ -0,0 +1,26 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Deutsche Telekom AG
+ *  ================================================================================
+ *  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.utils;
+
+public enum ContentType {
+    JSON,
+    XML
+}
diff --git a/cps-service/src/main/java/org/onap/cps/utils/XmlFileUtils.java b/cps-service/src/main/java/org/onap/cps/utils/XmlFileUtils.java
new file mode 100644
index 000000000..0946ae3f6
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/utils/XmlFileUtils.java
@@ -0,0 +1,165 @@
+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2022 Deutsche Telekom AG
+ *  ================================================================================
+ *  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.utils;
+
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.StringWriter;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import javax.xml.XMLConstants;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import org.onap.cps.spi.exceptions.DataValidationException;
+import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.SchemaContext;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.xml.sax.SAXException;
+
+public class XmlFileUtils {
+
+    private static DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
+    private static final String DATA_ROOT_NODE_TAG_NAME = "data";
+    private static final String ROOT_NODE_NAMESPACE = "urn:ietf:params:xml:ns:netconf:base:1.0";
+    private static final Pattern XPATH_PROPERTY_REGEX = Pattern.compile(
+            "\\[@(\\S{1,100})=['\\\"](\\S{1,100})['\\\"]\\]");
+
+    /**
+     * Prepare XML content.
+     *
+     * @param xmlContent XML content sent to store
+     * @param schemaContext schema context
+     * @return XML content wrapped by root node (if needed)
+     */
+    public static String prepareXmlContent(final String xmlContent, final SchemaContext schemaContext) {
+
+        return addRootNodeToXmlContent(xmlContent, schemaContext.getModules().iterator().next().getName(),
+                ROOT_NODE_NAMESPACE);
+
+    }
+
+    /**
+     * Prepare XML content.
+     *
+     * @param xmlContent XML content sent to store
+     * @param parentSchemaNode Parent schema node
+     * @return XML content wrapped by root node (if needed)
+     */
+    public static String prepareXmlContent(final String xmlContent, final DataSchemaNode parentSchemaNode,
+                                           final String xpath) {
+        final String namespace = parentSchemaNode.getQName().getNamespace().toString();
+        final String parentXpathPart = xpath.substring(xpath.lastIndexOf('/') + 1);
+        final Matcher regexMatcher = XPATH_PROPERTY_REGEX.matcher(parentXpathPart);
+        if (regexMatcher.find()) {
+            final HashMap<String, String> rootNodePropertyMap = new HashMap<String, String>();
+            rootNodePropertyMap.put(regexMatcher.group(1), regexMatcher.group(2));
+            return addRootNodeToXmlContent(xmlContent, parentSchemaNode.getQName().getLocalName(), namespace,
+                    rootNodePropertyMap);
+        }
+
+        return addRootNodeToXmlContent(xmlContent, parentSchemaNode.getQName().getLocalName(), namespace);
+    }
+
+    /**
+     * Add root node to XML content.
+     *
+     * @param xmlContent xml content to add root node
+     * @param rootNodeTagName root node tag name
+     * @param namespace root node namespace
+     * @param rootNodeProperty root node properites map
+     * @return An edited content with added root node (if needed)
+     */
+    public static String addRootNodeToXmlContent(final String xmlContent, final String rootNodeTagName,
+                                                 final String namespace,
+                                                 final HashMap<String, String> rootNodeProperty) {
+        try {
+            final DocumentBuilder documentBuilder = dbFactory.newDocumentBuilder();
+            final StringBuilder xmlStringBuilder = new StringBuilder();
+            xmlStringBuilder.append(xmlContent);
+            Document xmlDoc = documentBuilder.parse(
+                    new ByteArrayInputStream(xmlStringBuilder.toString().getBytes("utf-8")));
+            final Element root = xmlDoc.getDocumentElement();
+            if (!root.getTagName().equals(rootNodeTagName) && !root.getTagName().equals(DATA_ROOT_NODE_TAG_NAME)) {
+                xmlDoc = addDataRootNode(root, rootNodeTagName, namespace, rootNodeProperty);
+                xmlDoc.setXmlStandalone(true);
+                final TransformerFactory transformerFactory = TransformerFactory.newInstance();
+                transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
+                transformerFactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, "");
+                final Transformer transformer = transformerFactory.newTransformer();
+                final StringWriter stringWriter = new StringWriter();
+                transformer.transform(new DOMSource(xmlDoc), new StreamResult(stringWriter));
+                return stringWriter.toString();
+            }
+            return xmlContent;
+        } catch (SAXException | IOException | ParserConfigurationException | TransformerException exception) {
+            throw new DataValidationException("Failed to parse XML data", "Invalid xml input " + exception.getMessage(),
+                    exception);
+        }
+    }
+
+    /**
+     * Add root node to XML content.
+     *
+     * @param xmlContent XML content to add root node into
+     * @param rootNodeTagName Root node tag name
+     * @return XML content with root node tag added (if needed)
+     */
+    public static String addRootNodeToXmlContent(final String xmlContent, final String rootNodeTagName,
+                                                 final String namespace) {
+        return addRootNodeToXmlContent(xmlContent, rootNodeTagName, namespace, new HashMap<String, String>());
+    }
+
+    /**
+     * Add root node into DOM element.
+     *
+     * @param node DOM element to add root node into
+     * @param tagName Root tag name to add
+     * @return DOM element with a root node
+     */
+    static Document addDataRootNode(final Element node, final String tagName, final String namespace,
+                                    final HashMap<String, String> rootNodeProperty) {
+        try {
+            final DocumentBuilder docBuilder = dbFactory.newDocumentBuilder();
+            final Document document = docBuilder.newDocument();
+            final Element rootElement = document.createElementNS(namespace, tagName);
+            for (final Map.Entry<String, String> entry : rootNodeProperty.entrySet()) {
+                final Element propertyElement = document.createElement(entry.getKey());
+                propertyElement.setTextContent(entry.getValue());
+                rootElement.appendChild(propertyElement);
+            }
+            rootElement.appendChild(document.adoptNode(node));
+            document.appendChild(rootElement);
+            return document;
+        } catch (final ParserConfigurationException exception) {
+            throw new DataValidationException("Can't parse XML", "XML can't be parsed", exception);
+        }
+    }
+}
diff --git a/cps-service/src/main/java/org/onap/cps/utils/YangUtils.java b/cps-service/src/main/java/org/onap/cps/utils/YangUtils.java
index 9a61579b1..49d3a70f9 100644
--- a/cps-service/src/main/java/org/onap/cps/utils/YangUtils.java
+++ b/cps-service/src/main/java/org/onap/cps/utils/YangUtils.java
@@ -4,6 +4,7 @@
  *  Modifications Copyright (C) 2021 Bell Canada.
  *  Modifications Copyright (C) 2021 Pantheon.tech
  *  Modifications Copyright (C) 2022 TechMahindra Ltd.
+ *  Modifications Copyright (C) 2022 Deutsche Telekom AG
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -27,13 +28,20 @@ import com.google.gson.JsonSyntaxException;
 import com.google.gson.stream.JsonReader;
 import java.io.IOException;
 import java.io.StringReader;
+import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Collectors;
+import javax.xml.stream.XMLInputFactory;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
 import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -41,13 +49,18 @@ import org.onap.cps.spi.exceptions.DataValidationException;
 import org.opendaylight.yangtools.yang.common.QName;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
+import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
+import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 import org.opendaylight.yangtools.yang.data.api.schema.builder.DataContainerNodeBuilder;
 import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactory;
 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
 import org.opendaylight.yangtools.yang.data.codec.gson.JsonParserStream;
+import org.opendaylight.yangtools.yang.data.codec.xml.XmlParserStream;
 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
+import org.opendaylight.yangtools.yang.data.impl.schema.NormalizedNodeResult;
 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
@@ -55,6 +68,7 @@ import org.opendaylight.yangtools.yang.model.api.EffectiveStatementInference;
 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier;
 import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack;
+import org.xml.sax.SAXException;
 
 @Slf4j
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
@@ -64,7 +78,45 @@ public class YangUtils {
     private static final String XPATH_NODE_KEY_ATTRIBUTES_REGEX = "\\[.*?\\]";
 
     /**
-     * Parses jsonData into Collection of NormalizedNode according to given schema context.
+     * Parses data into Collection of NormalizedNode according to given schema context.
+     *
+     * @param nodeData      data string
+     * @param schemaContext schema context describing associated data model
+     * @return the NormalizedNode object
+     */
+    public static ContainerNode parseData(final ContentType contentType, final String nodeData,
+                                           final SchemaContext schemaContext) {
+        if (contentType == ContentType.JSON) {
+            return parseJsonData(nodeData, schemaContext, Optional.empty());
+        }
+        return parseXmlData(XmlFileUtils.prepareXmlContent(nodeData, schemaContext), schemaContext,
+                Optional.empty());
+    }
+
+    /**
+     * Parses data into NormalizedNode according to given schema context.
+     *
+     * @param nodeData      data string
+     * @param schemaContext schema context describing associated data model
+     * @return the NormalizedNode object
+     */
+    public static ContainerNode parseData(final ContentType contentType, final String nodeData,
+                                           final SchemaContext schemaContext, final String parentNodeXpath) {
+        final DataSchemaNode parentSchemaNode =
+                (DataSchemaNode) getDataSchemaNodeAndIdentifiersByXpath(parentNodeXpath, schemaContext)
+                        .get("dataSchemaNode");
+        final Collection<QName> dataSchemaNodeIdentifiers =
+                (Collection<QName>) getDataSchemaNodeAndIdentifiersByXpath(parentNodeXpath, schemaContext)
+                        .get("dataSchemaNodeIdentifiers");
+        if (contentType == ContentType.JSON) {
+            return parseJsonData(nodeData, schemaContext, Optional.of(dataSchemaNodeIdentifiers));
+        }
+        return parseXmlData(XmlFileUtils.prepareXmlContent(nodeData, parentSchemaNode, parentNodeXpath), schemaContext,
+                Optional.of(dataSchemaNodeIdentifiers));
+    }
+
+    /**
+     * Parses data into Collection of NormalizedNode according to given schema context.
      *
      * @param jsonData      json data as string
      * @param schemaContext schema context describing associated data model
@@ -85,7 +137,8 @@ public class YangUtils {
     public static ContainerNode parseJsonData(final String jsonData, final SchemaContext schemaContext,
         final String parentNodeXpath) {
         final Collection<QName> dataSchemaNodeIdentifiers =
-                getDataSchemaNodeIdentifiersByXpath(parentNodeXpath, schemaContext);
+                (Collection<QName>) getDataSchemaNodeAndIdentifiersByXpath(parentNodeXpath, schemaContext)
+                        .get("dataSchemaNodeIdentifiers");
         return parseJsonData(jsonData, schemaContext, Optional.of(dataSchemaNodeIdentifiers));
     }
 
@@ -105,7 +158,7 @@ public class YangUtils {
             final EffectiveModelContext effectiveModelContext = ((EffectiveModelContext) schemaContext);
             final EffectiveStatementInference effectiveStatementInference =
                     SchemaInferenceStack.of(effectiveModelContext,
-                    SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers.get())).toInference();
+                            SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers.get())).toInference();
             jsonParserStream =
                     JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory, effectiveStatementInference);
         } else {
@@ -115,22 +168,56 @@ public class YangUtils {
         try {
             jsonParserStream.parse(jsonReader);
             jsonParserStream.close();
-        } catch (final JsonSyntaxException exception) {
+        } catch (final IOException | JsonSyntaxException exception) {
             throw new DataValidationException(
-                "Failed to parse json data: " + jsonData, exception.getMessage(), exception);
-        } catch (final IOException | IllegalStateException illegalStateException) {
+                    "Failed to parse json data: " + jsonData, exception.getMessage(), exception);
+        } catch (final IllegalStateException | IllegalArgumentException exception) {
             throw new DataValidationException(
-                "Failed to parse json data. Unsupported xpath or json data:" + jsonData, illegalStateException
-                .getMessage(), illegalStateException);
+                    "Failed to parse json data. Unsupported xpath or json data:" + jsonData, exception
+                    .getMessage(), exception);
         }
         return dataContainerNodeBuilder.build();
     }
 
+    private static ContainerNode parseXmlData(final String xmlData, final SchemaContext schemaContext,
+                                               final Optional<Collection<QName>> dataSchemaNodeIdentifiers) {
+        final XMLInputFactory factory = XMLInputFactory.newInstance();
+        factory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
+        final NormalizedNodeResult normalizedNodeResult = new NormalizedNodeResult();
+        final NormalizedNodeStreamWriter normalizedNodeStreamWriter = ImmutableNormalizedNodeStreamWriter
+                .from(normalizedNodeResult);
+
+        final XmlParserStream xmlParser;
+        final EffectiveModelContext effectiveModelContext = ((EffectiveModelContext) schemaContext);
+
+        if (dataSchemaNodeIdentifiers.isPresent()) {
+            final EffectiveStatementInference effectiveStatementInference =
+                    SchemaInferenceStack.of(effectiveModelContext,
+                            SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers.get())).toInference();
+            xmlParser = XmlParserStream.create(normalizedNodeStreamWriter, effectiveStatementInference);
+        } else {
+            xmlParser = XmlParserStream.create(normalizedNodeStreamWriter, effectiveModelContext);
+        }
+
+        try {
+            final XMLStreamReader reader = factory.createXMLStreamReader(new StringReader(xmlData));
+            xmlParser.parse(reader);
+            xmlParser.close();
+        } catch (final XMLStreamException | URISyntaxException | IOException
+                       | SAXException | NullPointerException exception) {
+            throw new DataValidationException(
+                    "Failed to parse xml data: " + xmlData, exception.getMessage(), exception);
+        }
+        final NormalizedNode normalizedNode = getFirstChildXmlRoot(normalizedNodeResult.getResult());
+        return Builders.containerBuilder().withChild((DataContainerChild) normalizedNode)
+                .withNodeIdentifier(new YangInstanceIdentifier.NodeIdentifier(schemaContext.getQName())).build();
+    }
+
     /**
      * Create an xpath form a Yang Tools NodeIdentifier (i.e. PathArgument).
      *
      * @param nodeIdentifier the NodeIdentifier
-     * @return an xpath
+     * @return a xpath
      */
     public static String buildXpath(final YangInstanceIdentifier.PathArgument nodeIdentifier) {
         final StringBuilder xpathBuilder = new StringBuilder();
@@ -138,20 +225,20 @@ public class YangUtils {
 
         if (nodeIdentifier instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
             xpathBuilder.append(getKeyAttributesStatement(
-                (YangInstanceIdentifier.NodeIdentifierWithPredicates) nodeIdentifier));
+                    (YangInstanceIdentifier.NodeIdentifierWithPredicates) nodeIdentifier));
         }
         return xpathBuilder.toString();
     }
 
 
     private static String getKeyAttributesStatement(
-        final YangInstanceIdentifier.NodeIdentifierWithPredicates nodeIdentifier) {
+            final YangInstanceIdentifier.NodeIdentifierWithPredicates nodeIdentifier) {
         final List<String> keyAttributes = nodeIdentifier.entrySet().stream().map(
-            entry -> {
-                final String name = entry.getKey().getLocalName();
-                final String value = String.valueOf(entry.getValue()).replace("'", "\\'");
-                return String.format("@%s='%s'", name, value);
-            }
+                entry -> {
+                    final String name = entry.getKey().getLocalName();
+                    final String value = String.valueOf(entry.getValue()).replace("'", "\\'");
+                    return String.format("@%s='%s'", name, value);
+                }
         ).collect(Collectors.toList());
 
         if (keyAttributes.isEmpty()) {
@@ -162,10 +249,10 @@ public class YangUtils {
         }
     }
 
-    private static Collection<QName> getDataSchemaNodeIdentifiersByXpath(final String parentNodeXpath,
-                                                                      final SchemaContext schemaContext) {
+    private static Map<String, Object> getDataSchemaNodeAndIdentifiersByXpath(final String parentNodeXpath,
+                                                                              final SchemaContext schemaContext) {
         final String[] xpathNodeIdSequence = xpathToNodeIdSequence(parentNodeXpath);
-        return findDataSchemaNodeIdentifiersByXpathNodeIdSequence(xpathNodeIdSequence, schemaContext.getChildNodes(),
+        return findDataSchemaNodeAndIdentifiersByXpathNodeIdSequence(xpathNodeIdSequence, schemaContext.getChildNodes(),
                 new ArrayList<>());
     }
 
@@ -181,7 +268,7 @@ public class YangUtils {
         return xpathNodeIdSequence;
     }
 
-    private static Collection<QName> findDataSchemaNodeIdentifiersByXpathNodeIdSequence(
+    private static Map<String, Object> findDataSchemaNodeAndIdentifiersByXpathNodeIdSequence(
             final String[] xpathNodeIdSequence,
             final Collection<? extends DataSchemaNode> dataSchemaNodes,
             final Collection<QName> dataSchemaNodeIdentifiers) {
@@ -191,11 +278,15 @@ public class YangUtils {
             .findFirst().orElseThrow(() -> schemaNodeNotFoundException(currentXpathNodeId));
         dataSchemaNodeIdentifiers.add(currentDataSchemaNode.getQName());
         if (xpathNodeIdSequence.length <= 1) {
-            return dataSchemaNodeIdentifiers;
+            final Map<String, Object> dataSchemaNodeAndIdentifiers =
+                    new HashMap<>();
+            dataSchemaNodeAndIdentifiers.put("dataSchemaNode", currentDataSchemaNode);
+            dataSchemaNodeAndIdentifiers.put("dataSchemaNodeIdentifiers", dataSchemaNodeIdentifiers);
+            return dataSchemaNodeAndIdentifiers;
         }
         if (currentDataSchemaNode instanceof DataNodeContainer) {
-            return findDataSchemaNodeIdentifiersByXpathNodeIdSequence(
-                getNextLevelXpathNodeIdSequence(xpathNodeIdSequence),
+            return findDataSchemaNodeAndIdentifiersByXpathNodeIdSequence(
+                    getNextLevelXpathNodeIdSequence(xpathNodeIdSequence),
                     ((DataNodeContainer) currentDataSchemaNode).getChildNodes(),
                     dataSchemaNodeIdentifiers);
         }
@@ -212,4 +303,19 @@ public class YangUtils {
         return new DataValidationException("Invalid xpath.",
             String.format("No schema node was found for xpath identifier '%s'.", schemaNodeIdentifier));
     }
-}
+
+    private static NormalizedNode getFirstChildXmlRoot(final NormalizedNode parent) {
+        final String rootNodeType = parent.getIdentifier().getNodeType().getLocalName();
+        final Collection<DataContainerChild> children = (Collection<DataContainerChild>) parent.body();
+        final Iterator<DataContainerChild> iterator = children.iterator();
+        NormalizedNode child = null;
+        while (iterator.hasNext()) {
+            child = iterator.next();
+            if (!child.getIdentifier().getNodeType().getLocalName().equals(rootNodeType)
+                    && !(child instanceof LeafNode)) {
+                return child;
+            }
+        }
+        return getFirstChildXmlRoot(child);
+    }
+}
\ No newline at end of file