library/src/main/java/org/apache/apex/malhar/lib/appdata/query/serde/SimpleDataSerializer.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 org.apache.apex.malhar.lib.appdata.query.serde;

import java.io.IOException;

import org.codehaus.jackson.map.ObjectMapper;

import org.apache.apex.malhar.lib.appdata.schemas.Message;
import org.apache.apex.malhar.lib.appdata.schemas.ResultFormatter;

/**
 * This is a simple message serializer, which serializes messages using Jackson.
 * @since 3.0.0
 */
public class SimpleDataSerializer implements CustomMessageSerializer
{
  private ObjectMapper om = new ObjectMapper();

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

  @Override
  public String serialize(Message result, ResultFormatter resultFormatter)
  {
    try {
      return om.writeValueAsString(result);
    } catch (IOException ex) {
      ex.printStackTrace();
      return null;
    }
  }
}