| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * 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.event; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.base.Objects; |
| |
| /** |
| * Generic representation of an update. |
| * |
| * @param <T> type of value that was updated |
| */ |
| public class Change<T> { |
| |
| private final T oldValue; |
| private final T newValue; |
| |
| public Change(T oldValue, T newValue) { |
| this.oldValue = oldValue; |
| this.newValue = newValue; |
| } |
| |
| /** |
| * Returns previous value. |
| * @return previous value. |
| */ |
| public T oldValue() { |
| return oldValue; |
| } |
| |
| /** |
| * Returns new or current value. |
| * @return new value. |
| */ |
| public T newValue() { |
| return newValue; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| if (other == null || !(other instanceof Change)) { |
| return false; |
| } |
| Change<T> that = (Change<T>) other; |
| return Objects.equal(this.oldValue, that.oldValue) && |
| Objects.equal(this.newValue, that.newValue); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(oldValue, newValue); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("oldValue", oldValue) |
| .add("newValue", newValue) |
| .toString(); |
| } |
| } |