package org.apache.turbine.util;

 /*

  * 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.

  */

 import java.io.ByteArrayInputStream;

 import java.io.ByteArrayOutputStream;

 import java.io.ObjectInputStream;

 import java.io.ObjectOutputStream;

 import java.io.Serializable;

 import java.util.Map;

 /**

  * This is where common Object manipulation routines should go.

  *

  * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a>

  * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>

  * @version $Id: ObjectUtils.java 1850675 2019-01-07 18:48:42Z painter $

  */

 public abstract class ObjectUtils

 {

     /**

      * Converts a map to a byte array for storage/serialization.

      *

      * @param map The Map to convert.

      *

      * @return A byte[] with the converted Map.

      *

      * @throws Exception A generic exception.

      */

         public static byte[] serializeMap(Map<String, Object> map)

             throws Exception

     {

         byte[] byteArray = null;

         for (Object value : map.values())

         {

             if (! (value instanceof Serializable))

             {

                 throw new Exception("Could not serialize, value is not serializable:" + value);

             }

         }

         try (ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);

              ObjectOutputStream out = new ObjectOutputStream(baos))

         {

             out.writeObject(map);

             out.flush();

             byteArray = baos.toByteArray();

         }

         return byteArray;

     }

     /**

      * Deserializes a single object from an array of bytes.

      *

      * @param <T> type of the object to return

      * @param objectData The serialized object.

      *

      * @return The deserialized object, or <code>null</code> on failure.

      */

     @SuppressWarnings("unchecked")

     public static <T> T deserialize(byte[] objectData)

     {

         T object = null;

         if (objectData != null)

         {

             try (ByteArrayInputStream bin = new ByteArrayInputStream(objectData);

                  ObjectInputStream in = new ObjectInputStream(bin))

             {

                 // If objectData has not been initialized, an

                 // exception will occur.

                 object = (T)in.readObject();

             }

             catch (Exception e)

             {

                 // ignore

             }

         }

         return object;

     }

 }