/*
    * Copyright 2009 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.jboss.netty.buffer;
  
  import java.nio.ByteOrder;
  
  
  /**
   * A big-endian Java heap buffer.  It is recommended to use {@link ChannelBuffers#buffer(int)}
   * and {@link ChannelBuffers#wrappedBuffer(byte[])} instead of calling the
   * constructor explicitly.
   *
   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
   *
   * @version $Rev: 2206 $, $Date: 2010-03-03 14:35:01 +0900 (Wed, 03 Mar 2010) $
   */
  public class BigEndianHeapChannelBuffer extends HeapChannelBuffer {
  
      /**
       * Creates a new big-endian heap buffer with a newly allocated byte array.
       *
       * @param length the length of the new byte array
       */
      public BigEndianHeapChannelBuffer(int length) {
          super(length);
      }
  
      /**
       * Creates a new big-endian heap buffer with an existing byte array.
       *
       * @param array the byte array to wrap
       */
      public BigEndianHeapChannelBuffer(byte[] array) {
          super(array);
      }
  
      private BigEndianHeapChannelBuffer(byte[] array, int readerIndex, int writerIndex) {
          super(array, readerIndex, writerIndex);
      }
  
      public ChannelBufferFactory factory() {
          return HeapChannelBufferFactory.getInstance(ByteOrder.BIG_ENDIAN);
      }
  
      public ByteOrder order() {
          return ByteOrder.BIG_ENDIAN;
      }
  
      public short getShort(int index) {
          return (short) (array[index] << 8 | array[index+1] & 0xFF);
      }
  
      public int getUnsignedMedium(int index) {
          return  (array[index]   & 0xff) << 16 |
                  (array[index+1] & 0xff) <<  8 |
                  (array[index+2] & 0xff) <<  0;
      }
  
      public int getInt(int index) {
          return  (array[index]   & 0xff) << 24 |
                  (array[index+1] & 0xff) << 16 |
                  (array[index+2] & 0xff) <<  8 |
                  (array[index+3] & 0xff) <<  0;
      }
  
      public long getLong(int index) {
          return  ((long) array[index]   & 0xff) << 56 |
                  ((long) array[index+1] & 0xff) << 48 |
                  ((long) array[index+2] & 0xff) << 40 |
                  ((long) array[index+3] & 0xff) << 32 |
                  ((long) array[index+4] & 0xff) << 24 |
                  ((long) array[index+5] & 0xff) << 16 |
                  ((long) array[index+6] & 0xff) <<  8 |
                  ((long) array[index+7] & 0xff) <<  0;
      }
  
      public void setShort(int index, int value) {
          array[index  ] = (byte) (value >>> 8);
          array[index+1] = (byte) (value >>> 0);
      }
  
      public void setMedium(int index, int   value) {
          array[index  ] = (byte) (value >>> 16);
          array[index+1] = (byte) (value >>> 8);
          array[index+2] = (byte) (value >>> 0);
     }
 
     public void setInt(int index, int   value) {
         array[index  ] = (byte) (value >>> 24);
         array[index+1] = (byte) (value >>> 16);
         array[index+2] = (byte) (value >>> 8);
         array[index+3] = (byte) (value >>> 0);
     }
 
     public void setLong(int index, long  value) {
         array[index  ] = (byte) (value >>> 56);
         array[index+1] = (byte) (value >>> 48);
         array[index+2] = (byte) (value >>> 40);
         array[index+3] = (byte) (value >>> 32);
         array[index+4] = (byte) (value >>> 24);
         array[index+5] = (byte) (value >>> 16);
         array[index+6] = (byte) (value >>> 8);
         array[index+7] = (byte) (value >>> 0);
     }
 
     public ChannelBuffer duplicate() {
         return new BigEndianHeapChannelBuffer(array, readerIndex(), writerIndex());
     }
 
     public ChannelBuffer copy(int index, int length) {
         if (index < 0 || length < 0 || index + length > array.length) {
             throw new IndexOutOfBoundsException();
         }
 
         byte[] copiedArray = new byte[length];
         System.arraycopy(array, index, copiedArray, 0, length);
         return new BigEndianHeapChannelBuffer(copiedArray);
     }
 }