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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.ecmap;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.MoreObjects;
/**
* Describes a single update event in an EventuallyConsistentMap.
*/
final class UpdateEntry<K, V> {
private final K key;
private final MapValue<V> value;
/**
* Creates a new update entry.
*
* @param key key of the entry
* @param value value of the entry
*/
public UpdateEntry(K key, MapValue<V> value) {
this.key = checkNotNull(key);
this.value = value;
}
/**
* Returns the key.
*
* @return the key
*/
public K key() {
return key;
}
/**
* Returns the value of the entry.
*
* @return the value
*/
public MapValue<V> value() {
return value;
}
/**
* Returns if this entry is newer than other entry.
* @param other other entry
* @return true if this entry is newer; false otherwise
*/
public boolean isNewerThan(UpdateEntry<K, V> other) {
return other == null || other.value == null || (value != null && value.isNewerThan(other.value));
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("key", key())
.add("value", value)
.toString();
}
@SuppressWarnings("unused")
private UpdateEntry() {
this.key = null;
this.value = null;
}
}
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