content: /*
   * CDDL HEADER START
   *
   * The contents of this file are subject to the terms of the Common Development
   * and Distribution License (the "License").
   * You may not use this file except in compliance with the License.
   *
   * You can obtain a copy of the license at
   * src/com/vodafone360/people/VODAFONE.LICENSE.txt or
   * http://github.com/360/360-Engine-for-Android
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * When distributing Covered Code, include this CDDL HEADER in each file and
   * include the License file at src/com/vodafone360/people/VODAFONE.LICENSE.txt.
   * If applicable, add the following below this CDDL HEADER, with the fields
   * enclosed by brackets "[]" replaced with your own identifying information:
   * Portions Copyright [yyyy] [name of copyright owner]
   *
   * CDDL HEADER END
   *
   * Copyright 2010 Vodafone Sales & Services Ltd.  All rights reserved.
   * Use is subject to license terms.
   */
  
  package com.vodafone360.people.service.utils.hessian;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.Hashtable;
  
  import com.caucho.hessian.micro.MicroHessianOutput;
  import com.vodafone360.people.utils.CloseUtils;
  
  /**
   * Produce Hessian encoded byte array using Caucho Hessian implementation
   */
  public class HessianEncoder {
  
      /**
       * Create Hessian encoded byte array from Hashtable
       * 
       * @param ht Hashtable to encode
       * @return encoded byte array
       * @throws IOException
       */
      public static byte[] createHessianByteArray(String function, Hashtable<String, Object> ht)
              throws IOException {
  
          // write our hash table to Hessian format
          ByteArrayOutputStream bos = new ByteArrayOutputStream();
          MicroHessianOutput mho = new MicroHessianOutput(bos);
  
          mho.startCall(function);
          writeHashtable(ht, mho);
          mho.completeCall();
          CloseUtils.close(bos);
          return bos.toByteArray();
      }
  
      private static void writeHashtable(Hashtable<String, Object> ht, MicroHessianOutput mho)
              throws IOException {
          mho.writeMapBegin(null);
          Enumeration<String> e = ht.keys();
          while (e.hasMoreElements()) {
              Object key = e.nextElement();
              Object value = ht.get(key);
              mho.writeObject(key);
              if (value instanceof byte[]) {
                  mho.writeBytes((byte[])value);
              } else if (value instanceof Hashtable<?, ?>) {
                  @SuppressWarnings("unchecked")
                  Hashtable<String, Object> table = (Hashtable<String, Object>)value;
                  writeHashtable(table, mho);
              } else if (value instanceof ArrayList<?>) {
                  @SuppressWarnings("unchecked")
                  ArrayList<String> list = (ArrayList<String>)value;
                  writeStringArrayList(list, mho);
              } else {
                  mho.writeObject(value);
              }
          }
          mho.writeMapEnd();
      }
  
      private static void writeStringArrayList(ArrayList<String> list, MicroHessianOutput mho)
              throws IOException {
          mho.writeListBegin(list.size(), null);
          for (String to : list) {
              mho.writeString(to);
          }
          mho.writeListEnd();
      }
  }
  