org.apache.kafka.streams.examples.pageview.JsonPOJODeserializer 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.kafka.streams.examples.pageview;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.kafka.common.errors.SerializationException;
import org.apache.kafka.common.serialization.Deserializer;

import java.util.Map;

public class JsonPOJODeserializer implements Deserializer {
    private ObjectMapper objectMapper = new ObjectMapper();

    private Class tClass;

    /**
     * Default constructor needed by Kafka
     */
    public JsonPOJODeserializer() {
    }

    @SuppressWarnings("unchecked")
    @Override
    public void configure(Map props, boolean isKey) {
        tClass = (Class) props.get("JsonPOJOClass");
    }

    @Override
    public T deserialize(String topic, byte[] bytes) {
        if (bytes == null)
            return null;

        T data;
        try {
            data = objectMapper.readValue(bytes, tClass);
        } catch (Exception e) {
            throw new SerializationException(e);
        }

        return data;
    }

    @Override
    public void close() {

    }
}