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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.consistent.impl;
import java.util.function.Function;
import org.onosproject.store.service.MapEvent;
import org.onosproject.store.service.Versioned;
/**
* Result of a update operation.
* <p>
* Both old and new values are accessible along with a flag that indicates if the
* the value was updated. If flag is false, oldValue and newValue both
* point to the same unmodified value.
* @param <V> result type
*/
public class UpdateResult<K, V> {
private final boolean updated;
private final String mapName;
private final K key;
private final Versioned<V> oldValue;
private final Versioned<V> newValue;
public UpdateResult(boolean updated, String mapName, K key, Versioned<V> oldValue, Versioned<V> newValue) {
this.updated = updated;
this.mapName = mapName;
this.key = key;
this.oldValue = oldValue;
this.newValue = newValue;
}
public boolean updated() {
return updated;
}
public String mapName() {
return mapName;
}
public K key() {
return key;
}
public Versioned<V> oldValue() {
return oldValue;
}
public Versioned<V> newValue() {
return newValue;
}
public <K1, V1> UpdateResult<K1, V1> map(Function<K, K1> keyTransform, Function<V, V1> valueMapper) {
return new UpdateResult<>(updated,
mapName,
keyTransform.apply(key),
oldValue == null ? null : oldValue.map(valueMapper),
newValue == null ? null : newValue.map(valueMapper));
}
public MapEvent<K, V> toMapEvent() {
if (!updated) {
return null;
} else {
MapEvent.Type eventType = oldValue == null ?
MapEvent.Type.INSERT : newValue == null ? MapEvent.Type.REMOVE : MapEvent.Type.UPDATE;
Versioned<V> eventValue = eventType == MapEvent.Type.REMOVE ? oldValue : newValue;
return new MapEvent<>(mapName(), eventType, key(), eventValue);
}
}
}
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