/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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.
   */
  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;
      }
  
      public int getInt(int index) {
          return  (array[index]     & 0xff) << 24 |
                  (array[index + 1] & 0xff) << 16 |
                  (array[index + 2] & 0xff) <<  8 |
                  array[index + 3] & 0xff;
      }
  
      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;
      }
  
      public void setShort(int index, int value) {
          array[index]     = (byte) (value >>> 8);
          array[index + 1] = (byte) value;
      }
  
      public void setMedium(int index, int   value) {
          array[index]     = (byte) (value >>> 16);
          array[index + 1] = (byte) (value >>> 8);
          array[index + 2] = (byte) value;
      }
  
      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;
     }
 
     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;
     }
 
     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("Too many bytes to copy - Need "
                   + (index + length) + ", maximum is " + array.length);
         }
 
         byte[] copiedArray = new byte[length];
         System.arraycopy(array, index, copiedArray, 0, length);
         return new BigEndianHeapChannelBuffer(copiedArray);
     }
 }