| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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.apache.cloudstack.network.contrail.model; |
| |
| import java.io.Serializable; |
| import java.util.Comparator; |
| import java.util.TreeSet; |
| |
| public abstract class ModelObjectBase implements ModelObject { |
| public static class UuidComparator implements Comparator<ModelObject>, Serializable { |
| @Override |
| public int compare(ModelObject lhs, ModelObject rhs) { |
| if (lhs == null) { |
| if (rhs == null) { |
| return 0; |
| } |
| return -1; |
| } |
| if (rhs == null) { |
| return 1; |
| } |
| return lhs.compareTo(rhs); |
| } |
| } |
| |
| private TreeSet<ModelReference> _ancestors; |
| |
| private TreeSet<ModelObject> _successors; |
| |
| ModelObjectBase() { |
| _ancestors = new TreeSet<ModelReference>(); |
| _successors = new TreeSet<ModelObject>(new UuidComparator()); |
| } |
| |
| @Override |
| public void addSuccessor(ModelObject child) { |
| _successors.add(child); |
| ModelObjectBase base = (ModelObjectBase)child; |
| base._ancestors.add(new ModelReference(this)); |
| } |
| |
| @Override |
| public TreeSet<ModelReference> ancestors() { |
| return _ancestors; |
| } |
| |
| private void clearAncestorReference(ModelObjectBase child) { |
| ModelReference ref = null; |
| for (ModelReference objref : child._ancestors) { |
| if (objref.get() == this) { |
| ref = objref; |
| break; |
| } |
| } |
| if (ref != null) { |
| child._ancestors.remove(ref); |
| } |
| } |
| |
| @Override |
| public void clearSuccessors() { |
| for (ModelObject successor : _successors) { |
| clearAncestorReference((ModelObjectBase)successor); |
| } |
| _successors.clear(); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((_ancestors == null) ? 0 : _ancestors.hashCode()); |
| result = prime * result + ((_successors == null) ? 0 : _successors.hashCode()); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object rhs) { |
| if (this == rhs) |
| return true; |
| if (rhs == null) |
| return false; |
| ModelObject other; |
| try { |
| other = (ModelObject)rhs; |
| } catch (ClassCastException ex) { |
| return false; |
| } |
| return compareTo(other) == 0; |
| } |
| |
| @Override |
| protected void finalize() { |
| clearSuccessors(); |
| } |
| |
| public boolean hasDescendents() { |
| return !successors().isEmpty(); |
| } |
| |
| @Override |
| public void removeSuccessor(ModelObject child) { |
| clearAncestorReference((ModelObjectBase)child); |
| _successors.remove(child); |
| } |
| |
| @Override |
| public TreeSet<ModelObject> successors() { |
| return _successors; |
| } |
| } |