library/src/main/java/com/datatorrent/lib/appdata/query/serde/SimpleDataDeserializer.java

/**
 * 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 com.datatorrent.lib.appdata.query.serde;

import java.io.IOException;

import org.codehaus.jackson.map.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.datatorrent.lib.appdata.schemas.Message;

/**
 * This is a simple Message deserializer which deserializes messages using Jackson.
 * @since 3.0.0
 */
public class SimpleDataDeserializer implements CustomMessageDeserializer
{
  private ObjectMapper om = new ObjectMapper();

  /**
   * No-arg constructor is requried by {@link CustomMessageDeserializer} interface.
   */
  public SimpleDataDeserializer()
  {
  }

  @Override
  public Message deserialize(String json, Class<? extends Message> clazz, Object context) throws IOException
  {
    Message data;

    try {
      data = om.readValue(json, clazz);
    } catch (IOException ex) {
      throw ex;
    }

    return data;
  }

  private static final Logger LOG = LoggerFactory.getLogger(SimpleDataDeserializer.class);
}