+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - CCSDK
+ * ================================================================================
+ * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.ccsdk.sli.plugins.yangserializers.pnserializer;
+
+import java.util.Map;
+
+/**
+ * Implementation of properties node walker which helps in forming a new tree from properties node.
+ *
+ * @param <T> node child of properties node.
+ */
+public class DefaultPropertiesNodeWalker<T extends NodeChild> implements PropertiesNodeWalker {
+
+ @Override
+ public void walk(PropertiesNodeListener listener,
+ PropertiesNode propertiesNode) {
+ listener.start(propertiesNode);
+ walkChildNode(listener, propertiesNode);
+ listener.end(propertiesNode);
+ }
+
+ /**
+ * Walks the children node from the parent node.
+ *
+ * @param listener properties node listener
+ * @param propertiesNode properties node
+ */
+ public void walkChildNode(PropertiesNodeListener listener,
+ PropertiesNode propertiesNode) {
+ Map<String, T> children = getChildren(propertiesNode);
+ if (children != null) {
+ for (Map.Entry<String, T> entry : children.entrySet()) {
+ PropertiesNode node = ((PropertiesNode) entry.getValue());
+ listener.enterPropertiesNode(node);
+ walkChildNode(listener, node);
+ listener.exitPropertiesNode(node);
+ }
+ }
+ }
+
+ /**
+ * Returns the children node according to the property node type.
+ *
+ * @param value property node
+ * @return property node children
+ */
+ private Map<String,T> getChildren(PropertiesNode value) {
+ if (value instanceof RootNode) {
+ return ((RootNode) value).children();
+ }
+ switch (value.nodeType()) {
+ case SINGLE_INSTANCE_NODE:
+ return ((InnerNode) value).children();
+ case MULTI_INSTANCE_HOLDER_NODE:
+ return ((Map<String, T>) ((ListHolderNode) value).children());
+ case MULTI_INSTANCE_NODE:
+ return ((Map<String, T>) ((MultiInstanceNode) value)
+ .children());
+ case MULTI_INSTANCE_LEAF_HOLDER_NODE:
+ return ((Map<String, T>) ((LeafListHolderNode) value)
+ .children());
+ case SINGLE_INSTANCE_LEAF_NODE:
+ case MULTI_INSTANCE_LEAF_NODE:
+ return null;
+ default:
+ throw new IllegalArgumentException("No more types allowed");
+ }
+ }
+}