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/*
* Copyright 2014-2015 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.impl;
import com.google.common.base.MoreObjects;
import org.onosproject.store.Timestamp;
import java.util.Objects;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Wrapper class to store Timestamped value.
*
* @param <T> Timestamped value type
*/
public final class Timestamped<T> {
private final Timestamp timestamp;
private final T value;
/**
* Creates a time stamped value.
*
* @param value to be timestamp
* @param timestamp the timestamp
*/
public Timestamped(T value, Timestamp timestamp) {
this.value = checkNotNull(value);
this.timestamp = checkNotNull(timestamp);
}
/**
* Returns the value.
*
* @return value
*/
public T value() {
return value;
}
/**
* Returns the time stamp.
*
* @return time stamp
*/
public Timestamp timestamp() {
return timestamp;
}
/**
* Tests if this timestamped value is newer than the other.
*
* @param other timestamped value
* @return true if this instance is newer.
*/
public boolean isNewer(Timestamped<T> other) {
return isNewerThan(checkNotNull(other).timestamp());
}
/**
* Tests if this timestamp is newer than the specified timestamp.
*
* @param other timestamp to compare against
* @return true if this instance is newer
*/
public boolean isNewerThan(Timestamp other) {
return timestamp.isNewerThan(other);
}
@Override
public int hashCode() {
return timestamp.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof Timestamped)) {
return false;
}
@SuppressWarnings("unchecked")
Timestamped<T> that = (Timestamped<T>) obj;
return Objects.equals(this.timestamp, that.timestamp);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("timestamp", timestamp)
.add("value", value)
.toString();
}
// Default constructor for serialization
/**
* @deprecated in Cardinal Release
*/
@Deprecated
private Timestamped() {
this.value = null;
this.timestamp = null;
}
}
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