content: /*
   * 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.carbondata.core.util;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.util.zip.GZIPInputStream;
  import java.util.zip.GZIPOutputStream;
  
  import org.apache.carbondata.common.logging.LogServiceFactory;
  
  import org.apache.commons.io.input.ClassLoaderObjectInputStream;
  import org.apache.log4j.Logger;
  
  /**
   * It provides methods to convert object to Base64 string and vice versa.
   */
  public class ObjectSerializationUtil {
  
    private static final Logger LOG =
        LogServiceFactory.getLogService(ObjectSerializationUtil.class.getName());
  
    /**
     * Convert object to Base64 String
     *
     * @param obj Object to be serialized
     * @return serialized string
     * @throws IOException
     */
    public static String convertObjectToString(Object obj) throws IOException {
      ByteArrayOutputStream baos = null;
      GZIPOutputStream gos = null;
      ObjectOutputStream oos = null;
  
      try {
        baos = new ByteArrayOutputStream();
        gos = new GZIPOutputStream(baos);
        oos = new ObjectOutputStream(gos);
        oos.writeObject(obj);
      } finally {
        try {
          if (oos != null) {
            oos.close();
          }
          if (gos != null) {
            gos.close();
          }
          if (baos != null) {
            baos.close();
          }
        } catch (IOException e) {
          LOG.error(e.getMessage(), e);
        }
      }
  
      return CarbonUtil.encodeToString(baos.toByteArray());
    }
  
    /**
     * Converts Base64 string to object.
     *
     * @param objectString serialized object in string format
     * @return Object after convert string to object
     * @throws IOException
     */
    public static Object convertStringToObject(String objectString) throws IOException {
      if (objectString == null) {
        return null;
      }
  
      byte[] bytes = CarbonUtil.decodeStringToBytes(objectString);
  
      ByteArrayInputStream bais = null;
      GZIPInputStream gis = null;
      ObjectInputStream ois = null;
  
      try {
        bais = new ByteArrayInputStream(bytes);
        gis = new GZIPInputStream(bais);
        ois = new ClassLoaderObjectInputStream(Thread.currentThread().getContextClassLoader(), gis);
        return ois.readObject();
      } catch (ClassNotFoundException e) {
        throw new IOException("Could not read object", e);
      } finally {
        try {
          if (ois != null) {
            ois.close();
          }
          if (gis != null) {
            gis.close();
          }
          if (bais != null) {
            bais.close();
          }
        } catch (IOException e) {
          LOG.error(e.getMessage(), e);
        }
      }
    }
  
  }
  