Fix SonarQube warnings

- fixed most new warnings (required some rerfactoring and renaming)
- had to change method order (becasue private/public)
  which loosk liek a big change because gerrit cannot match thee old/new correctly :-(
- some reformatting to improve readability
- used autoclosable fro streams
- use of deprecated ODL methods will be addressed by separate commit (Lee-Anjella)

Issue-ID: CPS-475
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
Change-Id: I4b2f74492ac9e2c644659edab1e7ff05dddcbd20

3 files changed, 137 insertions, 121 deletions

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 c776e5bb31..65dfa7f5c6 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
@@ -252,8 +252,7 @@ public class CpsDataServiceImpl implements CpsDataService {
             return new DataNodeBuilder().withContainerNode(containerNode).build();
         }
 
-        final ContainerNode containerNode = YangUtils
-                .parseData(contentType, nodeData, schemaContext, parentNodeXpath);
+        final ContainerNode containerNode = YangUtils.parseData(contentType, nodeData, schemaContext, parentNodeXpath);
 
         return new DataNodeBuilder()
                 .withParentNodeXpath(parentNodeXpath)
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
index 0946ae3f64..3654042078 100644
--- a/cps-service/src/main/java/org/onap/cps/utils/XmlFileUtils.java
+++ b/cps-service/src/main/java/org/onap/cps/utils/XmlFileUtils.java
@@ -20,10 +20,10 @@
 
 package org.onap.cps.utils;
 
-
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.StringWriter;
+import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
@@ -37,6 +37,8 @@ import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
 import org.onap.cps.spi.exceptions.DataValidationException;
 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
@@ -44,26 +46,25 @@ import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.xml.sax.SAXException;
 
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
 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})['\\\"]\\]");
+    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) {
-
+    public static String prepareXmlContent(final String xmlContent, final SchemaContext schemaContext)
+        throws IOException, ParserConfigurationException, TransformerException, SAXException {
         return addRootNodeToXmlContent(xmlContent, schemaContext.getModules().iterator().next().getName(),
-                ROOT_NODE_NAMESPACE);
-
+                YangUtils.DATA_ROOT_NODE_NAMESPACE);
     }
 
     /**
@@ -71,15 +72,19 @@ public class XmlFileUtils {
      *
      * @param xmlContent XML content sent to store
      * @param parentSchemaNode Parent schema node
+     * @Param xpath Parent xpath
+     *
      * @return XML content wrapped by root node (if needed)
      */
-    public static String prepareXmlContent(final String xmlContent, final DataSchemaNode parentSchemaNode,
-                                           final String xpath) {
+    public static String prepareXmlContent(final String xmlContent,
+                                           final DataSchemaNode parentSchemaNode,
+                                           final String xpath)
+        throws IOException, ParserConfigurationException, TransformerException, SAXException {
         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>();
+            final HashMap<String, String> rootNodePropertyMap = new HashMap<>();
             rootNodePropertyMap.put(regexMatcher.group(1), regexMatcher.group(2));
             return addRootNodeToXmlContent(xmlContent, parentSchemaNode.getQName().getLocalName(), namespace,
                     rootNodePropertyMap);
@@ -88,41 +93,30 @@ public class XmlFileUtils {
         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,
+    private 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);
+                                                 final Map<String, String> rootNodeProperty)
+        throws IOException, SAXException, ParserConfigurationException, TransformerException {
+        final DocumentBuilder documentBuilder = dbFactory.newDocumentBuilder();
+        final StringBuilder xmlStringBuilder = new StringBuilder();
+        xmlStringBuilder.append(xmlContent);
+        final Document document = documentBuilder.parse(
+                new ByteArrayInputStream(xmlStringBuilder.toString().getBytes(StandardCharsets.UTF_8)));
+        final Element root = document.getDocumentElement();
+        if (!root.getTagName().equals(rootNodeTagName)
+            && !root.getTagName().equals(YangUtils.DATA_ROOT_NODE_TAG_NAME)) {
+            final Document documentWithRootNode = addDataRootNode(root, rootNodeTagName, namespace, rootNodeProperty);
+            documentWithRootNode.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(documentWithRootNode), new StreamResult(stringWriter));
+            return stringWriter.toString();
         }
+        return xmlContent;
     }
 
     /**
@@ -132,9 +126,11 @@ public class XmlFileUtils {
      * @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>());
+    public static String addRootNodeToXmlContent(final String xmlContent,
+                                                 final String rootNodeTagName,
+                                                 final String namespace)
+        throws IOException, ParserConfigurationException, TransformerException, SAXException {
+        return addRootNodeToXmlContent(xmlContent, rootNodeTagName, namespace, new HashMap<>());
     }
 
     /**
@@ -144,8 +140,10 @@ public class XmlFileUtils {
      * @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) {
+    static Document addDataRootNode(final Element node,
+                                    final String tagName,
+                                    final String namespace,
+                                    final Map<String, String> rootNodeProperty) {
         try {
             final DocumentBuilder docBuilder = dbFactory.newDocumentBuilder();
             final Document document = docBuilder.newDocument();
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 eb0c764cbc..c0dfe5205a 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
@@ -38,9 +38,11 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Collectors;
+import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.stream.XMLInputFactory;
 import javax.xml.stream.XMLStreamException;
 import javax.xml.stream.XMLStreamReader;
+import javax.xml.transform.TransformerException;
 import lombok.AccessLevel;
 import lombok.NoArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -75,6 +77,9 @@ import org.xml.sax.SAXException;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class YangUtils {
 
+    public static final String DATA_ROOT_NODE_NAMESPACE = "urn:ietf:params:xml:ns:netconf:base:1.0";
+    public static final String DATA_ROOT_NODE_TAG_NAME = "data";
+
     /**
      * Parses data into Collection of NormalizedNode according to given schema context.
      *
@@ -82,13 +87,13 @@ public class YangUtils {
      * @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) {
+    public static ContainerNode parseData(final ContentType contentType,
+                                          final String nodeData,
+                                          final SchemaContext schemaContext) {
         if (contentType == ContentType.JSON) {
-            return parseJsonData(nodeData, schemaContext, Optional.empty());
+            return parseJsonDataWithOptionalParent(nodeData, schemaContext, Optional.empty());
         }
-        return parseXmlData(XmlFileUtils.prepareXmlContent(nodeData, schemaContext), schemaContext,
-                Optional.empty());
+        return parseXmlDataWithOptionalParent(nodeData, schemaContext, Optional.empty());
     }
 
     /**
@@ -98,19 +103,14 @@ public class YangUtils {
      * @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");
+    public static ContainerNode parseData(final ContentType contentType,
+                                          final String nodeData,
+                                          final SchemaContext schemaContext,
+                                          final String parentNodeXpath) {
         if (contentType == ContentType.JSON) {
-            return parseJsonData(nodeData, schemaContext, Optional.of(dataSchemaNodeIdentifiers));
+            return parseJsonDataWithOptionalParent(nodeData, schemaContext, Optional.of(parentNodeXpath));
         }
-        return parseXmlData(XmlFileUtils.prepareXmlContent(nodeData, parentSchemaNode, parentNodeXpath), schemaContext,
-                Optional.of(dataSchemaNodeIdentifiers));
+        return parseXmlDataWithOptionalParent(nodeData, schemaContext, Optional.of(parentNodeXpath));
     }
 
     /**
@@ -121,7 +121,7 @@ public class YangUtils {
      * @return the Collection of NormalizedNode object
      */
     public static ContainerNode parseJsonData(final String jsonData, final SchemaContext schemaContext) {
-        return parseJsonData(jsonData, schemaContext, Optional.empty());
+        return parseJsonDataWithOptionalParent(jsonData, schemaContext, Optional.empty());
     }
 
     /**
@@ -132,40 +132,59 @@ public class YangUtils {
      * @param parentNodeXpath the xpath referencing the parent node current data fragment belong to
      * @return the NormalizedNode object
      */
-    public static ContainerNode parseJsonData(final String jsonData, final SchemaContext schemaContext,
-        final String parentNodeXpath) {
-        final Collection<QName> dataSchemaNodeIdentifiers =
-                (Collection<QName>) getDataSchemaNodeAndIdentifiersByXpath(parentNodeXpath, schemaContext)
-                        .get("dataSchemaNodeIdentifiers");
-        return parseJsonData(jsonData, schemaContext, Optional.of(dataSchemaNodeIdentifiers));
+    public static ContainerNode parseJsonData(final String jsonData,
+                                              final SchemaContext schemaContext,
+                                              final String parentNodeXpath) {
+        return parseJsonDataWithOptionalParent(jsonData, schemaContext, Optional.of(parentNodeXpath));
+    }
+
+    /**
+     * Create an xpath form a Yang Tools NodeIdentifier (i.e. PathArgument).
+     *
+     * @param nodeIdentifier the NodeIdentifier
+     * @return a xpath
+     */
+    public static String buildXpath(final YangInstanceIdentifier.PathArgument nodeIdentifier) {
+        final StringBuilder xpathBuilder = new StringBuilder();
+        xpathBuilder.append("/").append(nodeIdentifier.getNodeType().getLocalName());
+
+        if (nodeIdentifier instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
+            xpathBuilder.append(getKeyAttributesStatement(
+                (YangInstanceIdentifier.NodeIdentifierWithPredicates) nodeIdentifier));
+        }
+        return xpathBuilder.toString();
     }
 
-    private static ContainerNode parseJsonData(final String jsonData, final SchemaContext schemaContext,
-        final Optional<Collection<QName>> dataSchemaNodeIdentifiers) {
+    private static ContainerNode parseJsonDataWithOptionalParent(final String jsonData,
+                                                                 final SchemaContext schemaContext,
+                                                                 final Optional<String> parentNodeXpath) {
         final JSONCodecFactory jsonCodecFactory = JSONCodecFactorySupplier.DRAFT_LHOTKA_NETMOD_YANG_JSON_02
             .getShared((EffectiveModelContext) schemaContext);
         final DataContainerNodeBuilder<YangInstanceIdentifier.NodeIdentifier, ContainerNode> dataContainerNodeBuilder =
                 Builders.containerBuilder()
-                        .withNodeIdentifier(new YangInstanceIdentifier.NodeIdentifier(schemaContext.getQName()));
+                        .withNodeIdentifier(new YangInstanceIdentifier.NodeIdentifier(
+                            QName.create(DATA_ROOT_NODE_NAMESPACE, DATA_ROOT_NODE_TAG_NAME)
+                        ));
         final NormalizedNodeStreamWriter normalizedNodeStreamWriter = ImmutableNormalizedNodeStreamWriter
                 .from(dataContainerNodeBuilder);
         final JsonReader jsonReader = new JsonReader(new StringReader(jsonData));
         final JsonParserStream jsonParserStream;
 
-        if (dataSchemaNodeIdentifiers.isPresent()) {
+        if (parentNodeXpath.isPresent()) {
+            final Collection<QName> dataSchemaNodeIdentifiers
+                = getDataSchemaNodeIdentifiers(schemaContext, parentNodeXpath.get());
             final EffectiveModelContext effectiveModelContext = ((EffectiveModelContext) schemaContext);
             final EffectiveStatementInference effectiveStatementInference =
                     SchemaInferenceStack.of(effectiveModelContext,
-                            SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers.get())).toInference();
+                            SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers)).toInference();
             jsonParserStream =
                     JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory, effectiveStatementInference);
         } else {
             jsonParserStream = JsonParserStream.create(normalizedNodeStreamWriter, jsonCodecFactory);
         }
 
-        try {
+        try (jsonParserStream) {
             jsonParserStream.parse(jsonReader);
-            jsonParserStream.close();
         } catch (final IOException | JsonSyntaxException exception) {
             throw new DataValidationException(
                     "Failed to parse json data: " + jsonData, exception.getMessage(), exception);
@@ -177,58 +196,58 @@ public class YangUtils {
         return dataContainerNodeBuilder.build();
     }
 
-    private static ContainerNode parseXmlData(final String xmlData, final SchemaContext schemaContext,
-                                               final Optional<Collection<QName>> dataSchemaNodeIdentifiers) {
+    private static ContainerNode parseXmlDataWithOptionalParent(final String xmlData,
+                                                                final SchemaContext schemaContext,
+                                                                final Optional<String> parentNodeXpath) {
         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 =
+        final EffectiveModelContext effectiveModelContext = (EffectiveModelContext) schemaContext;
+        final XmlParserStream xmlParserStream;
+        final String preparedXmlContent;
+        try {
+            if (parentNodeXpath.isPresent()) {
+                final DataSchemaNode parentSchemaNode =
+                    (DataSchemaNode) getDataSchemaNodeAndIdentifiersByXpath(parentNodeXpath.get(), schemaContext)
+                        .get("dataSchemaNode");
+                final Collection<QName> dataSchemaNodeIdentifiers =
+                    getDataSchemaNodeIdentifiers(schemaContext, parentNodeXpath.get());
+                final EffectiveStatementInference effectiveStatementInference =
                     SchemaInferenceStack.of(effectiveModelContext,
-                            SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers.get())).toInference();
-            xmlParser = XmlParserStream.create(normalizedNodeStreamWriter, effectiveStatementInference);
-        } else {
-            xmlParser = XmlParserStream.create(normalizedNodeStreamWriter, effectiveModelContext);
-        }
+                        SchemaNodeIdentifier.Absolute.of(dataSchemaNodeIdentifiers)).toInference();
+                preparedXmlContent = XmlFileUtils.prepareXmlContent(xmlData, parentSchemaNode, parentNodeXpath.get());
+                xmlParserStream = XmlParserStream.create(normalizedNodeStreamWriter, effectiveStatementInference);
+            } else {
+                preparedXmlContent = XmlFileUtils.prepareXmlContent(xmlData, schemaContext);
+                xmlParserStream = 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) {
+            try (xmlParserStream;
+                 StringReader stringReader = new StringReader(preparedXmlContent)) {
+                final XMLStreamReader xmlStreamReader = factory.createXMLStreamReader(stringReader);
+                xmlParserStream.parse(xmlStreamReader);
+            }
+        } catch (final XMLStreamException | URISyntaxException | IOException | SAXException | NullPointerException
+                       | ParserConfigurationException | TransformerException exception) {
             throw new DataValidationException(
-                    "Failed to parse xml data: " + xmlData, exception.getMessage(), exception);
+                "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();
+        final DataContainerChild dataContainerChild =
+            (DataContainerChild) getFirstChildXmlRoot(normalizedNodeResult.getResult());
+        final YangInstanceIdentifier.NodeIdentifier nodeIdentifier =
+            new YangInstanceIdentifier.NodeIdentifier(dataContainerChild.getIdentifier().getNodeType());
+        return Builders.containerBuilder().withChild(dataContainerChild).withNodeIdentifier(nodeIdentifier).build();
     }
 
-    /**
-     * Create an xpath form a Yang Tools NodeIdentifier (i.e. PathArgument).
-     *
-     * @param nodeIdentifier the NodeIdentifier
-     * @return a xpath
-     */
-    public static String buildXpath(final YangInstanceIdentifier.PathArgument nodeIdentifier) {
-        final StringBuilder xpathBuilder = new StringBuilder();
-        xpathBuilder.append("/").append(nodeIdentifier.getNodeType().getLocalName());
-
-        if (nodeIdentifier instanceof YangInstanceIdentifier.NodeIdentifierWithPredicates) {
-            xpathBuilder.append(getKeyAttributesStatement(
-                    (YangInstanceIdentifier.NodeIdentifierWithPredicates) nodeIdentifier));
-        }
-        return xpathBuilder.toString();
+    private static Collection<QName> getDataSchemaNodeIdentifiers(final SchemaContext schemaContext,
+                                                                  final String parentNodeXpath) {
+        return (Collection<QName>) getDataSchemaNodeAndIdentifiersByXpath(parentNodeXpath, schemaContext)
+            .get("dataSchemaNodeIdentifiers");
     }
 
-
     private static String getKeyAttributesStatement(
             final YangInstanceIdentifier.NodeIdentifierWithPredicates nodeIdentifier) {
         final List<String> keyAttributes = nodeIdentifier.entrySet().stream().map(
@@ -313,4 +332,4 @@ public class YangUtils {
         }
         return getFirstChildXmlRoot(child);
     }
-}
\ No newline at end of file
+}