org.owasp.dependencycheck.data.nvd.json.NodeFlatteningCollector Maven / Gradle / Ivy
/*
* This file is part of dependency-check-core.
*
* 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.
*
* Copyright (c) 2018 Jeremy Long. All Rights Reserved.
*/
package org.owasp.dependencycheck.data.nvd.json;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collector;
import java.util.stream.Stream;
/**
* Used to flatten a hierarchical list of nodes with children.
*
* @author Jeremy Long
*/
public class NodeFlatteningCollector implements Collector, Stream> {
/**
* Flattens the hierarchical list of nodes.
*
* @param node the node with children to flatten
* @return the flattened list of nodes
*/
private List flatten(DefNode node) {
final List result = new ArrayList<>();
result.add(node);
return flatten(result, node.getChildren());
}
/**
* Flattens the hierarchical list of nodes.
*
* @param result the results
* @param nodes the nodes
* @return the flattened list of nodes
*/
private List flatten(List result, List nodes) {
nodes.forEach(n -> {
flatten(result, n.getChildren());
result.add(n);
});
return result;
}
@Override
public Supplier> supplier() {
return ArrayList::new;
}
@Override
public BiConsumer, DefNode> accumulator() {
return (nodes, n) -> nodes.addAll(flatten(n));
}
@Override
public BinaryOperator> combiner() {
return (map, other) -> {
map.addAll(other);
return map;
};
}
@Override
public Function, Stream> finisher() {
return (m) -> m.stream();
}
@Override
public Set characteristics() {
return EnumSet.of(Characteristics.UNORDERED);
}
}