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/*
 * Copyright 2005-2014 Red Hat, Inc.
 * Red Hat 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.hornetq.utils;

import org.hornetq.api.core.HornetQBuffer;
import org.hornetq.api.core.SimpleString;

/**
 * Helper methods to read and write from HornetQBuffer.
 *
 * @author Clebert Suconic
 *
 *
 */
public class BufferHelper
{

   /** Size of a String as if it was a Nullable Simple String */
   public static int sizeOfNullableSimpleString(String str)
   {
      if (str == null)
      {
         return DataConstants.SIZE_BOOLEAN;
      }
      else
      {
         return DataConstants.SIZE_BOOLEAN + sizeOfSimpleString(str);
      }
   }

   /** Size of a String as it if was a Simple String*/
   public static int sizeOfSimpleString(String str)
   {
      return DataConstants.SIZE_INT + str.length() * 2;
   }

   public static void writeAsNullableSimpleString(HornetQBuffer buffer, String str)
   {
      buffer.writeNullableSimpleString(SimpleString.toSimpleString(str));
   }

   public static String readNullableSimpleStringAsString(HornetQBuffer buffer)
   {
      SimpleString str = buffer.readNullableSimpleString();
      return str != null ? str.toString() : null;
   }

   public static void writeAsSimpleString(HornetQBuffer buffer, String str)
   {
      buffer.writeSimpleString(new SimpleString(str));
   }

   /**
    * @param buffer
    */
   public static void writeNullableBoolean(HornetQBuffer buffer, Boolean value)
   {
      buffer.writeBoolean(value != null);

      if (value != null)
      {
         buffer.writeBoolean(value.booleanValue());
      }
   }

   public static int sizeOfNullableBoolean(Boolean value)
   {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_BOOLEAN : 0);
   }

   public static Boolean readNullableBoolean(HornetQBuffer buffer)
   {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull)
      {
         return buffer.readBoolean();
      }
      else
      {
         return null;
      }
   }

   /**
    * @param buffer
    */
   public static void writeNullableLong(HornetQBuffer buffer, Long value)
   {
      buffer.writeBoolean(value != null);

      if (value != null)
      {
         buffer.writeLong(value.longValue());
      }
   }

   /**
    * @param buffer
    */
   public static void writeNullableDouble(HornetQBuffer buffer, Double value)
   {
      buffer.writeBoolean(value != null);

      if (value != null)
      {
         buffer.writeDouble(value.doubleValue());
      }
   }

   public static int sizeOfNullableLong(Long value)
   {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_LONG : 0);
   }

   public static int sizeOfNullableDouble(Double value)
   {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_DOUBLE : 0);
   }


   public static Long readNullableLong(HornetQBuffer buffer)
   {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull)
      {
         return buffer.readLong();
      }
      else
      {
         return null;
      }
   }

   /**
    * @param buffer
    */
   public static void writeNullableInteger(HornetQBuffer buffer, Integer value)
   {
      buffer.writeBoolean(value != null);

      if (value != null)
      {
         buffer.writeInt(value.intValue());
      }
   }

   public static int sizeOfNullableInteger(Integer value)
   {
      return DataConstants.SIZE_BOOLEAN + (value != null ? DataConstants.SIZE_INT : 0);
   }

   public static Integer readNullableInteger(HornetQBuffer buffer)
   {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull)
      {
         return buffer.readInt();
      }
      else
      {
         return null;
      }
   }

   public static Double readNullableDouble(HornetQBuffer buffer)
   {
      boolean isNotNull = buffer.readBoolean();

      if (isNotNull)
      {
         return buffer.readDouble();
      }
      else
      {
         return null;
      }
   }

}