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/*
* Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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.traccar.database;
import org.traccar.model.Group;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class GroupTree {
private static class GroupNode {
private Group group;
private GroupNode parent;
private Collection<GroupNode> children = new HashSet<>();
public GroupNode(Group group) {
this.group = group;
}
@Override
public int hashCode() {
return (int) group.getId();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof GroupNode)) {
return false;
}
return obj == this || group.getId() == ((GroupNode) obj).group.getId();
}
public Group getGroup() {
return group;
}
public void setParent(GroupNode parent) {
this.parent = parent;
if (parent != null) {
parent.children.add(this);
}
}
public GroupNode getParent() {
return parent;
}
public Collection<GroupNode> getChildren() {
return children;
}
}
private final Map<Long, GroupNode> groupMap = new HashMap<>();
public GroupTree(Collection<Group> groups) {
for (Group group : groups) {
groupMap.put(group.getId(), new GroupNode(group));
}
for (GroupNode node : groupMap.values()) {
if (node.getGroup().getGroupId() != 0) {
node.setParent(groupMap.get(node.getGroup().getGroupId()));
}
}
}
public Collection<Group> getDescendants(long groupId) {
Set<GroupNode> results = new HashSet<>();
getDescendants(results, groupMap.get(groupId));
Collection<Group> groups = new ArrayList<>();
for (GroupNode node : results) {
groups.add(node.getGroup());
}
return groups;
}
private void getDescendants(Set<GroupNode> results, GroupNode node) {
for (GroupNode child : node.getChildren()) {
results.add(child);
getDescendants(results, child);
}
}
}
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