| /* |
| * 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; |
| } |
| } |