org.apache.iotdb.db.mqtt.PayloadFormatManager Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.iotdb.db.mqtt;

import com.google.common.base.Preconditions;
import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;

/**
 * PayloadFormatManager loads payload formatter from SPI services.
 */
public class PayloadFormatManager {
    private static Map map = new HashMap<>();

    static {
        init();
    }

    private static void init() {
        ServiceLoader formats = ServiceLoader.load(PayloadFormatter.class);
        for (PayloadFormatter format : formats) {
            map.put(format.getName(), format);
        }
    }

    public static PayloadFormatter getPayloadFormat(String name) {
        Preconditions.checkArgument(map.containsKey(name), "Unknown payload format named: " + name);
        return map.get(name);
    }
}