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/*
* Copyright 2015 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.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;
}
}
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