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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Bell Canada. 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.spi.model;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import lombok.extern.slf4j.Slf4j;
import org.onap.cps.utils.YangUtils;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerChild;
import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.LeafSetNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
import org.opendaylight.yangtools.yang.data.api.schema.MapNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.ValueNode;
@Slf4j
public class DataNodeBuilder {
private NormalizedNode<?, ?> normalizedNodeTree;
private String xpath;
private Collection<DataNode> childDataNodes = Collections.emptySet();
/**
* To use {@link NormalizedNode} for creating {@link DataNode}.
*
* @param normalizedNodeTree used for creating the Data Node
* @return this {@link DataNodeBuilder} object
*/
public DataNodeBuilder withNormalizedNodeTree(final NormalizedNode<?, ?> normalizedNodeTree) {
this.normalizedNodeTree = normalizedNodeTree;
return this;
}
/**
* To use xpath for creating {@link DataNode}.
*
* @param xpath for the data node
* @return DataNodeBuilder
*/
public DataNodeBuilder withXpath(final String xpath) {
this.xpath = xpath;
return this;
}
/**
* To specify child nodes needs to be used while creating {@link DataNode}.
*
* @param childDataNodes to be added to the dataNode
* @return DataNodeBuilder
*/
public DataNodeBuilder withChildDataNodes(final Collection<DataNode> childDataNodes) {
// Added as this is being set from test cases .
// Open for suggestions
this.childDataNodes = childDataNodes;
return this;
}
/**
* To create the {@link DataNode}.
*
* @return {@link DataNode}
*/
public DataNode build() {
if (normalizedNodeTree != null) {
return buildFromNormalizedNodeTree();
} else {
return buildFromAttributes();
}
}
private DataNode buildFromAttributes() {
final DataNode dataNode = new DataNode();
dataNode.setXpath(xpath);
dataNode.setChildDataNodes(childDataNodes);
return dataNode;
}
private DataNode buildFromNormalizedNodeTree() {
final DataNode formalRootDataNode = new DataNodeBuilder().withXpath("").build();
addDataNodeFromNormalizedNode(formalRootDataNode, normalizedNodeTree);
return formalRootDataNode.getChildDataNodes().iterator().next();
}
private static void addDataNodeFromNormalizedNode(final DataNode currentDataNode,
final NormalizedNode<?, ?> normalizedNode) {
if (normalizedNode instanceof DataContainerNode) {
addYangContainer(currentDataNode, (DataContainerNode<?>) normalizedNode);
} else if (normalizedNode instanceof MapNode) {
addDataNodeForEachListElement(currentDataNode, (MapNode) normalizedNode);
} else if (normalizedNode instanceof ValueNode) {
final ValueNode<?, ?> valuesNode = (ValueNode<?, ?>) normalizedNode;
addYangLeaf(currentDataNode, valuesNode.getNodeType().getLocalName(), valuesNode.getValue());
} else if (normalizedNode instanceof LeafSetNode) {
addYangLeafList(currentDataNode, (LeafSetNode<?>) normalizedNode);
} else {
log.warn("Unsupported NormalizedNode type detected: {}", normalizedNode.getClass());
}
}
private static void addYangContainer(final DataNode currentDataNode, final DataContainerNode<?> dataContainerNode) {
final DataNode dataContainerDataNode = createAndAddChildDataNode(currentDataNode,
YangUtils.buildXpath(dataContainerNode.getIdentifier()));
final Collection<DataContainerChild<?, ?>> normalizedChildNodes = dataContainerNode.getValue();
for (final NormalizedNode<?, ?> normalizedNode : normalizedChildNodes) {
addDataNodeFromNormalizedNode(dataContainerDataNode, normalizedNode);
}
}
private static void addYangLeaf(final DataNode currentDataNode, final String leafName, final Object leafValue) {
final Map<String, Object> leaves = new ImmutableMap.Builder<String, Object>()
.putAll(currentDataNode.getLeaves())
.put(leafName, leafValue)
.build();
currentDataNode.setLeaves(leaves);
}
private static void addYangLeafList(final DataNode currentDataNode, final LeafSetNode<?> leafSetNode) {
final String leafListName = leafSetNode.getNodeType().getLocalName();
final List<?> leafListValues = ((Collection<? extends NormalizedNode<?, ?>>) leafSetNode.getValue())
.stream()
.map(normalizedNode -> ((ValueNode<?, ?>) normalizedNode).getValue())
.collect(Collectors.toUnmodifiableList());
addYangLeaf(currentDataNode, leafListName, leafListValues);
}
private static void addDataNodeForEachListElement(final DataNode currentDataNode, final MapNode mapNode) {
final Collection<MapEntryNode> mapEntryNodes = mapNode.getValue();
for (final MapEntryNode mapEntryNode : mapEntryNodes) {
addDataNodeFromNormalizedNode(currentDataNode, mapEntryNode);
}
}
private static DataNode createAndAddChildDataNode(final DataNode parentDataNode, final String childXpath) {
final DataNode newChildDataNode = new DataNodeBuilder()
.withXpath(parentDataNode.getXpath() + childXpath)
.build();
final Set<DataNode> allChildDataNodes = new ImmutableSet.Builder<DataNode>()
.addAll(parentDataNode.getChildDataNodes())
.add(newChildDataNode)
.build();
parentDataNode.setChildDataNodes(allChildDataNodes);
return newChildDataNode;
}
}
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