| /* |
| * Copyright 2015-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.store.service; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.collect.ComparisonChain; |
| import org.onosproject.store.Timestamp; |
| |
| import java.util.Objects; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * A logical timestamp that derives its value from two input values. The first |
| * value always takes precedence over the second value when comparing timestamps. |
| */ |
| public class MultiValuedTimestamp<T extends Comparable<T>, U extends Comparable<U>> |
| implements Timestamp { |
| |
| private final T value1; |
| private final U value2; |
| |
| /** |
| * Creates a new timestamp based on two values. The first value has higher |
| * precedence than the second when comparing timestamps. |
| * |
| * @param value1 first value |
| * @param value2 second value |
| */ |
| public MultiValuedTimestamp(T value1, U value2) { |
| this.value1 = checkNotNull(value1); |
| this.value2 = checkNotNull(value2); |
| } |
| |
| @Override |
| public int compareTo(Timestamp o) { |
| checkArgument(o instanceof MultiValuedTimestamp, |
| "Must be MultiValuedTimestamp", o); |
| MultiValuedTimestamp that = (MultiValuedTimestamp) o; |
| |
| return ComparisonChain.start() |
| .compare(this.value1, that.value1) |
| .compare(this.value2, that.value2) |
| .result(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(value1, value2); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (!(obj instanceof MultiValuedTimestamp)) { |
| return false; |
| } |
| MultiValuedTimestamp that = (MultiValuedTimestamp) obj; |
| return Objects.equals(this.value1, that.value1) && |
| Objects.equals(this.value2, that.value2); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("value1", value1) |
| .add("value2", value2) |
| .toString(); |
| } |
| |
| /** |
| * Returns the first value. |
| * |
| * @return first value |
| */ |
| public T value1() { |
| return value1; |
| } |
| |
| /** |
| * Returns the second value. |
| * |
| * @return second value |
| */ |
| public U value2() { |
| return value2; |
| } |
| |
| // Default constructor for serialization |
| @SuppressWarnings("unused") |
| private MultiValuedTimestamp() { |
| this.value1 = null; |
| this.value2 = null; |
| } |
| } |