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/*-
* ============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.dfserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeType;
import org.onap.ccsdk.sli.core.sli.SvcLogicException;
import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType;
import java.util.Iterator;
import java.util.Map;
import static com.fasterxml.jackson.databind.node.JsonNodeType.NUMBER;
import static com.fasterxml.jackson.databind.node.JsonNodeType.STRING;
import static org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType.MULTI_INSTANCE_LEAF_NODE;
import static org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType.MULTI_INSTANCE_NODE;
import static org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType.SINGLE_INSTANCE_LEAF_NODE;
import static org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.NodeType.SINGLE_INSTANCE_NODE;
/**
* Implementation of JSON walker to walk through the nodes and process it.
*/
public class DefaultJsonWalker implements JsonWalker {
@Override
public void walk(JsonListener listener, JsonNode jsonNode) throws
SvcLogicException {
Iterator<Map.Entry<String, JsonNode>> children = jsonNode.fields();
while (children.hasNext()) {
Map.Entry<String, JsonNode> child = children.next();
JsonNode value = child.getValue();
String key = child.getKey();
if (value.isArray()) {
processMultiNodes(key, value, listener);
} else {
processSingleNode(key, value, listener);
}
}
}
/**
* Processes single instance node or leaf, by adding the node to from
* JSON and walking through all its children recursively.
*
* @param key JSON name
* @param value JSON node
* @param listener JSON listener
* @throws SvcLogicException when processing the node fails
*/
private void processSingleNode(String key, JsonNode value,
JsonListener listener)
throws SvcLogicException {
NodeType nodeType;
if (!value.isContainerNode()) {
nodeType = SINGLE_INSTANCE_LEAF_NODE;
} else {
nodeType = SINGLE_INSTANCE_NODE;
}
processNode(key, value, nodeType, listener);
}
/**
* Processes multi instance node or leaf, by adding the node to from JSON
* and walking through all its instance recursively.
*
* @param key JSON name
* @param value JSON node
* @param listener JSON listener
* @throws SvcLogicException when processing a single instance fails
*/
private void processMultiNodes(String key, JsonNode value,
JsonListener listener)
throws SvcLogicException {
NodeType nodeType;
Iterator<JsonNode> multiNodes = value.elements();
while (multiNodes.hasNext()) {
if (isLeafListNode((ArrayNode) value)) {
nodeType = MULTI_INSTANCE_LEAF_NODE;
} else {
nodeType = MULTI_INSTANCE_NODE;
}
JsonNode multiNode = multiNodes.next();
processNode(key, multiNode, nodeType, listener);
}
}
/**
* Processes each node by first entering the JSON node through JSON
* listener, second a call back to walking the rest of the tree of the
* node and finally exiting the node.
*
* @param key JSON name
* @param node JSON node
* @param nodeType JSON node type
* @param listener JSON listener
* @throws SvcLogicException when entering a JSON node fails
*/
private void processNode(String key, JsonNode node, NodeType nodeType,
JsonListener listener) throws SvcLogicException {
listener.enterJsonNode(key, node, nodeType);
walk(listener, node);
listener.exitJsonNode(node);
}
/**
* Returns true if the node corresponds to a leaf-list node; false
* otherwise.
*
* @param node JSON node
* @return true if node corresponds to leaf-list node; false otherwise
*/
private boolean isLeafListNode(ArrayNode node) {
Iterator<JsonNode> children = node.elements();
while (children.hasNext()) {
JsonNodeType type = children.next().getNodeType();
if (type != STRING && type != NUMBER) {
return false;
}
}
return true;
}
}
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