/*
    * 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 io.netty.buffer;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  import java.nio.channels.GatheringByteChannel;
  import java.nio.channels.ScatteringByteChannel;
  
  /**
   * A derived buffer which exposes its parent's sub-region only.  It is
   * recommended to use {@link ByteBuf#slice()} and
   * {@link ByteBuf#slice(int, int)} instead of calling the constructor
   * explicitly.
   *
   * @deprecated Do not use.
   */
  @Deprecated
  public class SlicedByteBuf extends AbstractDerivedByteBuf {
  
      private final ByteBuf buffer;
      private final int adjustment;
      private final int length;
  
      public SlicedByteBuf(ByteBuf buffer, int index, int length) {
          super(length);
          if (index < 0 || index > buffer.capacity() - length) {
              throw new IndexOutOfBoundsException(buffer + ".slice(" + index + ", " + length + ')');
          }
  
          if (buffer instanceof SlicedByteBuf) {
              this.buffer = ((SlicedByteBuf) buffer).buffer;
              adjustment = ((SlicedByteBuf) buffer).adjustment + index;
          } else if (buffer instanceof DuplicatedByteBuf) {
              this.buffer = buffer.unwrap();
              adjustment = index;
          } else {
              this.buffer = buffer;
              adjustment = index;
          }
          this.length = length;
  
          writerIndex(length);
      }
  
      @Override
      public ByteBuf unwrap() {
          return buffer;
      }
  
      @Override
      public ByteBufAllocator alloc() {
          return unwrap().alloc();
      }
  
      @Override
      @Deprecated
      public ByteOrder order() {
          return unwrap().order();
      }
  
      @Override
      public boolean isDirect() {
          return unwrap().isDirect();
      }
  
      @Override
      public int capacity() {
          return length;
      }
  
      @Override
      public ByteBuf capacity(int newCapacity) {
          throw new UnsupportedOperationException("sliced buffer");
      }
  
      @Override
      public boolean hasArray() {
          return unwrap().hasArray();
      }
  
      @Override
      public byte[] array() {
         return unwrap().array();
     }
 
     @Override
     public int arrayOffset() {
         return idx(unwrap().arrayOffset());
     }
 
     @Override
     public boolean hasMemoryAddress() {
         return unwrap().hasMemoryAddress();
     }
 
     @Override
     public long memoryAddress() {
         return unwrap().memoryAddress() + adjustment;
     }
 
     @Override
     public byte getByte(int index) {
         checkIndex0(index, 1);
         return unwrap().getByte(idx(index));
     }
 
     @Override
     protected byte _getByte(int index) {
         return unwrap().getByte(idx(index));
     }
 
     @Override
     public short getShort(int index) {
         checkIndex0(index, 2);
         return unwrap().getShort(idx(index));
     }
 
     @Override
     protected short _getShort(int index) {
         return unwrap().getShort(idx(index));
     }
 
     @Override
     public int getUnsignedMedium(int index) {
         checkIndex0(index, 3);
         return unwrap().getUnsignedMedium(idx(index));
     }
 
     @Override
     protected int _getUnsignedMedium(int index) {
         return unwrap().getUnsignedMedium(idx(index));
     }
 
     @Override
     public int getInt(int index) {
         checkIndex0(index, 4);
         return unwrap().getInt(idx(index));
     }
 
     @Override
     protected int _getInt(int index) {
         return unwrap().getInt(idx(index));
     }
 
     @Override
     public long getLong(int index) {
         checkIndex0(index, 8);
         return unwrap().getLong(idx(index));
     }
 
     @Override
     protected long _getLong(int index) {
         return unwrap().getLong(idx(index));
     }
 
     @Override
     public ByteBuf duplicate() {
         return unwrap().duplicate().setIndex(idx(readerIndex()), idx(writerIndex()));
     }
 
     @Override
     public ByteBuf copy(int index, int length) {
         checkIndex0(index, length);
         return unwrap().copy(idx(index), length);
     }
 
     @Override
     public ByteBuf slice(int index, int length) {
         checkIndex0(index, length);
         return unwrap().slice(idx(index), length);
     }
 
     @Override
     public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
         checkIndex0(index, length);
         unwrap().getBytes(idx(index), dst, dstIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
         checkIndex0(index, length);
         unwrap().getBytes(idx(index), dst, dstIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, ByteBuffer dst) {
         checkIndex0(index, dst.remaining());
         unwrap().getBytes(idx(index), dst);
         return this;
     }
 
     @Override
     public ByteBuf setByte(int index, int value) {
         checkIndex0(index, 1);
         unwrap().setByte(idx(index), value);
         return this;
     }
 
     @Override
     protected void _setByte(int index, int value) {
         unwrap().setByte(idx(index), value);
     }
 
     @Override
     public ByteBuf setShort(int index, int value) {
         checkIndex0(index, 2);
         unwrap().setShort(idx(index), value);
         return this;
     }
 
     @Override
     protected void _setShort(int index, int value) {
         unwrap().setShort(idx(index), value);
     }
 
     @Override
     public ByteBuf setMedium(int index, int value) {
         checkIndex0(index, 3);
         unwrap().setMedium(idx(index), value);
         return this;
     }
 
     @Override
     protected void _setMedium(int index, int value) {
         unwrap().setMedium(idx(index), value);
     }
 
     @Override
     public ByteBuf setInt(int index, int value) {
         checkIndex0(index, 4);
         unwrap().setInt(idx(index), value);
         return this;
     }
 
     @Override
     protected void _setInt(int index, int value) {
         unwrap().setInt(idx(index), value);
     }
 
     @Override
     public ByteBuf setLong(int index, long value) {
         checkIndex0(index, 8);
         unwrap().setLong(idx(index), value);
         return this;
     }
 
     @Override
     protected void _setLong(int index, long value) {
         unwrap().setLong(idx(index), value);
     }
 
     @Override
     public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
         checkIndex0(index, length);
         unwrap().setBytes(idx(index), src, srcIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
         checkIndex0(index, length);
         unwrap().setBytes(idx(index), src, srcIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, ByteBuffer src) {
         checkIndex0(index, src.remaining());
         unwrap().setBytes(idx(index), src);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
         checkIndex0(index, length);
         unwrap().getBytes(idx(index), out, length);
         return this;
     }
 
     @Override
     public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
         checkIndex0(index, length);
         return unwrap().getBytes(idx(index), out, length);
     }
 
     @Override
     public int setBytes(int index, InputStream in, int length) throws IOException {
         checkIndex0(index, length);
         return unwrap().setBytes(idx(index), in, length);
     }
 
     @Override
     public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
         checkIndex0(index, length);
         return unwrap().setBytes(idx(index), in, length);
     }
 
     @Override
     public int nioBufferCount() {
         return unwrap().nioBufferCount();
     }
 
     @Override
     public ByteBuffer nioBuffer(int index, int length) {
         checkIndex0(index, length);
         return unwrap().nioBuffer(idx(index), length);
     }
 
     @Override
     public ByteBuffer[] nioBuffers(int index, int length) {
         checkIndex0(index, length);
         return unwrap().nioBuffers(idx(index), length);
     }
 
     @Override
     public int forEachByte(int index, int length, ByteBufProcessor processor) {
         checkIndex0(index, length);
         int ret = unwrap().forEachByte(idx(index), length, processor);
         if (ret >= adjustment) {
             return ret - adjustment;
         } else {
             return -1;
         }
     }
 
     @Override
     public int forEachByteDesc(int index, int length, ByteBufProcessor processor) {
         checkIndex0(index, length);
         int ret = unwrap().forEachByteDesc(idx(index), length, processor);
         if (ret >= adjustment) {
             return ret - adjustment;
         } else {
             return -1;
         }
     }
 
     /**
      * Returns the index with the needed adjustment.
      */
     final int idx(int index) {
         return index + adjustment;
     }
 }