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-rw-r--r--src/org/traccar/database/GroupTree.java106
1 files changed, 106 insertions, 0 deletions
diff --git a/src/org/traccar/database/GroupTree.java b/src/org/traccar/database/GroupTree.java
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+++ b/src/org/traccar/database/GroupTree.java
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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);
+ }
+ }
+
+}