[ONOS-5088] YANG SBI Broker Implementation.
Change-Id: Ibe87e095a4c209c54e3e90aceca0ec9097c5ede0
diff --git a/apps/yms/app/src/main/java/org/onosproject/yms/app/ych/defaultcodecs/xml/DefaultXmlCodecWalker.java b/apps/yms/app/src/main/java/org/onosproject/yms/app/ych/defaultcodecs/xml/DefaultXmlCodecWalker.java
new file mode 100644
index 0000000..b5a9ea2
--- /dev/null
+++ b/apps/yms/app/src/main/java/org/onosproject/yms/app/ych/defaultcodecs/xml/DefaultXmlCodecWalker.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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.
+ */
+
+package org.onosproject.yms.app.ych.defaultcodecs.xml;
+
+import org.dom4j.Element;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Iterator;
+
+import static org.onosproject.yms.app.ych.defaultcodecs.xml.XmlNodeType.OBJECT_NODE;
+import static org.onosproject.yms.app.ych.defaultcodecs.xml.XmlNodeType.TEXT_NODE;
+
+/**
+ * Represents implementation of codec xml walker.
+ */
+class DefaultXmlCodecWalker implements XmlWalker {
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ @Override
+ public void walk(XmlListener listener, Element element,
+ Element rootElement) {
+ try {
+ listener.enterXmlElement(element, getElementType(element),
+ rootElement);
+
+ if (element.hasContent() && !element.isTextOnly()) {
+ for (Iterator i = element.elementIterator(); i.hasNext();) {
+ Element childElement = (Element) i.next();
+ walk(listener, childElement, rootElement);
+ }
+ }
+
+ listener.exitXmlElement(element, getElementType(element),
+ rootElement);
+ } catch (Exception e) {
+ log.error("Exception occurred when walk xml element: {}", element);
+ }
+ }
+
+ /**
+ * Determine the type of an element.
+ *
+ * @param element to be analysed
+ * @return type of the element
+ */
+ private XmlNodeType getElementType(Element element) {
+ return element.hasContent() && element.isTextOnly() ?
+ TEXT_NODE : OBJECT_NODE;
+ }
+}