| /* |
| * Copyright 2016-present Open Networking Laboratory |
| * |
| * 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.onosproject.store.primitives; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.util.Comparator; |
| import java.util.Iterator; |
| import java.util.Objects; |
| import java.util.TreeSet; |
| |
| import org.onosproject.store.service.DocumentPath; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.collect.Sets; |
| |
| /** |
| * A {@code DocumentTree} node. |
| */ |
| public class DocumentTreeNode<V> { |
| private final DocumentPath key; |
| private V value; |
| private long version; |
| private final TreeSet<DocumentTreeNode<V>> children = |
| Sets.newTreeSet(new Comparator<DocumentTreeNode<V>>() { |
| @Override |
| public int compare(DocumentTreeNode<V> o1, |
| DocumentTreeNode<V> o2) { |
| return o1.getKey().compareTo(o2.getKey()); |
| } |
| }); |
| private final DocumentTreeNode<V> parent; |
| |
| public DocumentTreeNode(DocumentPath key, |
| V value, |
| long version, |
| DocumentTreeNode<V> parent) { |
| this.key = checkNotNull(key); |
| this.value = checkNotNull(value); |
| this.version = version; |
| this.parent = parent; |
| } |
| |
| /** |
| * Returns this node's key. |
| * |
| * @return the key |
| */ |
| public DocumentPath getKey() { |
| return key; |
| } |
| |
| /** |
| * Returns this node's value. |
| * |
| * @return the value |
| */ |
| public V getValue() { |
| return value; |
| } |
| |
| /** |
| * Returns this node's version. |
| * |
| * @return the version |
| */ |
| public long getVersion() { |
| return version; |
| } |
| |
| /** |
| * Updates this node. |
| * |
| * @param newValue new value to be set |
| * @param newVersion new version to be set |
| */ |
| public void update(V newValue, long newVersion) { |
| this.value = newValue; |
| this.version = newVersion; |
| } |
| |
| /** |
| * Returns a collection of the children of this node. |
| * |
| * @return iterator for the children of this node. |
| */ |
| public Iterator<DocumentTreeNode<V>> getChildren() { |
| return children.iterator(); |
| } |
| |
| /** |
| * Adds a child to this node. |
| * |
| * @param child the child node to be added |
| * @return {@code true} if the child set was modified as a result of this call, {@code false} otherwise |
| */ |
| public boolean addChild(DocumentTreeNode<V> child) { |
| return children.add(child); |
| } |
| |
| /** |
| * Removes a child node. |
| * |
| * @param child the child node to be removed |
| * @return {@code true} if the child set was modified as a result of this call, {@code false} otherwise |
| */ |
| public boolean removeChild(String child) { |
| return children.remove(child); |
| } |
| |
| /** |
| * Returns the parent of this node. |
| * |
| * @return the parent node of this node, which may be null |
| */ |
| public DocumentTreeNode<V> getParent() { |
| return parent; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(this.key); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof DocumentTreeNode) { |
| DocumentTreeNode<V> that = (DocumentTreeNode<V>) obj; |
| if (this.parent.equals(that.parent)) { |
| if (this.children.size() == that.children.size()) { |
| for (DocumentTreeNode<V> child : this.children) { |
| if (!that.children.contains(child)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| MoreObjects.ToStringHelper helper = |
| MoreObjects.toStringHelper(getClass()) |
| .add("parent", this.parent) |
| .add("key", this.key) |
| .add("value", this.value); |
| for (DocumentTreeNode<V> child : children) { |
| helper = helper.add("child", child.key); |
| } |
| return helper.toString(); |
| } |
| |
| } |