/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.map.impl.mapstore;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
/**
* Empty map data store for providing neutral null behaviour.
*/
class EmptyMapDataStore implements MapDataStore {
@Override
public Object add(Object key, Object value, long now) {
return value;
}
@Override
public void addTransient(Object key, long now) {
}
@Override
public Object addBackup(Object key, Object value, long now) {
return value;
}
@Override
public void remove(Object key, long now) {
}
@Override
public void removeBackup(Object key, long now) {
}
@Override
public void reset() {
}
@Override
public Object load(Object key) {
return null;
}
@Override
public Map loadAll(Collection keys) {
return Collections.emptyMap();
}
@Override
public void removeAll(Collection keys) {
}
@Override
public boolean loadable(Object key) {
return false;
}
@Override
public long softFlush() {
return 0;
}
@Override
public void hardFlush() {
}
@Override
public Object flush(Object key, Object value, boolean backup) {
return value;
}
@Override
public int notFinishedOperationsCount() {
return 0;
}
@Override
public boolean isPostProcessingMapStore() {
return false;
}
}