hazelcast-master/hazelcast/src/main/java/com/hazelcast/partition/strategy/StringAndPartitionAwarePartitioningStrategy.java
/*
 * Copyright (c) 2008-2023, 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.partition.strategy;

import com.hazelcast.partition.PartitionAware;
import com.hazelcast.partition.PartitioningStrategy;
import com.hazelcast.internal.serialization.SerializableByConvention;

@SerializableByConvention
public final class StringAndPartitionAwarePartitioningStrategy implements PartitioningStrategy {

    //since the StringAndPartitionAwarePartitioningStrategy is stateless, we can just create an instance up front
    //and keep reusing that. No need to create an instance of this class if it isn't needed.
    public static final StringAndPartitionAwarePartitioningStrategy INSTANCE
            = new StringAndPartitionAwarePartitioningStrategy();

    //we don't want instance.
    private StringAndPartitionAwarePartitioningStrategy() {
    }

    @Override
    public Object getPartitionKey(Object key) {
        if (key instanceof String) {
            return StringPartitioningStrategy.getPartitionKey((String) key);
        } else if (key instanceof PartitionAware) {
            return ((PartitionAware) key).getPartitionKey();
        }
        return null;
    }
}
