/*
    * 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;
  import java.nio.charset.Charset;
  
  /**
   * Wrapper which swap the {@link ByteOrder} of a {@link ByteBuf}.
   */
  public class SwappedByteBuf extends ByteBuf {
  
      private final ByteBuf buf;
      private final ByteOrder order;
  
      public SwappedByteBuf(ByteBuf buf) {
          if (buf == null) {
              throw new NullPointerException("buf");
          }
          this.buf = buf;
          if (buf.order() == ByteOrder.BIG_ENDIAN) {
              order = ByteOrder.LITTLE_ENDIAN;
          } else {
              order = ByteOrder.BIG_ENDIAN;
          }
      }
  
      @Override
      public ByteOrder order() {
          return order;
      }
  
      @Override
      public ByteBuf order(ByteOrder endianness) {
          if (endianness == null) {
              throw new NullPointerException("endianness");
          }
          if (endianness == order) {
              return this;
          }
          return buf;
      }
  
      @Override
      public ByteBuf unwrap() {
          return buf;
      }
  
      @Override
      public ByteBufAllocator alloc() {
          return buf.alloc();
      }
  
      @Override
      public int capacity() {
          return buf.capacity();
      }
  
      @Override
      public ByteBuf capacity(int newCapacity) {
          buf.capacity(newCapacity);
          return this;
      }
  
      @Override
      public int maxCapacity() {
          return buf.maxCapacity();
      }
  
      @Override
      public boolean isDirect() {
          return buf.isDirect();
      }
  
      @Override
      public int readerIndex() {
          return buf.readerIndex();
      }
  
      @Override
     public ByteBuf readerIndex(int readerIndex) {
         buf.readerIndex(readerIndex);
         return this;
     }
 
     @Override
     public int writerIndex() {
         return buf.writerIndex();
     }
 
     @Override
     public ByteBuf writerIndex(int writerIndex) {
         buf.writerIndex(writerIndex);
         return this;
     }
 
     @Override
     public ByteBuf setIndex(int readerIndex, int writerIndex) {
         buf.setIndex(readerIndex, writerIndex);
         return this;
     }
 
     @Override
     public int readableBytes() {
         return buf.readableBytes();
     }
 
     @Override
     public int writableBytes() {
         return buf.writableBytes();
     }
 
     @Override
     public int maxWritableBytes() {
         return buf.maxWritableBytes();
     }
 
     @Override
     public boolean isReadable() {
         return buf.isReadable();
     }
 
     @Override
     public boolean isReadable(int size) {
         return buf.isReadable(size);
     }
 
     @Override
     public boolean isWritable() {
         return buf.isWritable();
     }
 
     @Override
     public boolean isWritable(int size) {
         return buf.isWritable(size);
     }
 
     @Override
     public ByteBuf clear() {
         buf.clear();
         return this;
     }
 
     @Override
     public ByteBuf markReaderIndex() {
         buf.markReaderIndex();
         return this;
     }
 
     @Override
     public ByteBuf resetReaderIndex() {
         buf.resetReaderIndex();
         return this;
     }
 
     @Override
     public ByteBuf markWriterIndex() {
         buf.markWriterIndex();
         return this;
     }
 
     @Override
     public ByteBuf resetWriterIndex() {
         buf.resetWriterIndex();
         return this;
     }
 
     @Override
     public ByteBuf discardReadBytes() {
         buf.discardReadBytes();
         return this;
     }
 
     @Override
     public ByteBuf discardSomeReadBytes() {
         buf.discardSomeReadBytes();
         return this;
     }
 
     @Override
     public ByteBuf ensureWritable(int writableBytes) {
         buf.ensureWritable(writableBytes);
         return this;
     }
 
     @Override
     public int ensureWritable(int minWritableBytes, boolean force) {
         return buf.ensureWritable(minWritableBytes, force);
     }
 
     @Override
     public boolean getBoolean(int index) {
         return buf.getBoolean(index);
     }
 
     @Override
     public byte getByte(int index) {
         return buf.getByte(index);
     }
 
     @Override
     public short getUnsignedByte(int index) {
         return buf.getUnsignedByte(index);
     }
 
     @Override
     public short getShort(int index) {
         return ByteBufUtil.swapShort(buf.getShort(index));
     }
 
     @Override
     public int getUnsignedShort(int index) {
         return getShort(index) & 0xFFFF;
     }
 
     @Override
     public int getMedium(int index) {
         return ByteBufUtil.swapMedium(buf.getMedium(index));
     }
 
     @Override
     public int getUnsignedMedium(int index) {
         return getMedium(index) & 0xFFFFFF;
     }
 
     @Override
     public int getInt(int index) {
         return ByteBufUtil.swapInt(buf.getInt(index));
     }
 
     @Override
     public long getUnsignedInt(int index) {
         return getInt(index) & 0xFFFFFFFFL;
     }
 
     @Override
     public long getLong(int index) {
         return ByteBufUtil.swapLong(buf.getLong(index));
     }
 
     @Override
     public char getChar(int index) {
         return (char) getShort(index);
     }
 
     @Override
     public float getFloat(int index) {
         return Float.intBitsToFloat(getInt(index));
     }
 
     @Override
     public double getDouble(int index) {
         return Double.longBitsToDouble(getLong(index));
     }
 
     @Override
     public ByteBuf getBytes(int index, ByteBuf dst) {
         buf.getBytes(index, dst);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, ByteBuf dst, int length) {
         buf.getBytes(index, dst, length);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
         buf.getBytes(index, dst, dstIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, byte[] dst) {
         buf.getBytes(index, dst);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
         buf.getBytes(index, dst, dstIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, ByteBuffer dst) {
         buf.getBytes(index, dst);
         return this;
     }
 
     @Override
     public ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
         buf.getBytes(index, out, length);
         return this;
     }
 
     @Override
     public int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
         return buf.getBytes(index, out, length);
     }
 
     @Override
     public ByteBuf setBoolean(int index, boolean value) {
         buf.setBoolean(index, value);
         return this;
     }
 
     @Override
     public ByteBuf setByte(int index, int value) {
         buf.setByte(index, value);
         return this;
     }
 
     @Override
     public ByteBuf setShort(int index, int value) {
         buf.setShort(index, ByteBufUtil.swapShort((short) value));
         return this;
     }
 
     @Override
     public ByteBuf setMedium(int index, int value) {
         buf.setMedium(index, ByteBufUtil.swapMedium(value));
         return this;
     }
 
     @Override
     public ByteBuf setInt(int index, int value) {
         buf.setInt(index, ByteBufUtil.swapInt(value));
         return this;
     }
 
     @Override
     public ByteBuf setLong(int index, long value) {
         buf.setLong(index, ByteBufUtil.swapLong(value));
         return this;
     }
 
     @Override
     public ByteBuf setChar(int index, int value) {
         setShort(index, value);
         return this;
     }
 
     @Override
     public ByteBuf setFloat(int index, float value) {
         setInt(index, Float.floatToRawIntBits(value));
         return this;
     }
 
     @Override
     public ByteBuf setDouble(int index, double value) {
         setLong(index, Double.doubleToRawLongBits(value));
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, ByteBuf src) {
         buf.setBytes(index, src);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, ByteBuf src, int length) {
         buf.setBytes(index, src, length);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
         buf.setBytes(index, src, srcIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, byte[] src) {
         buf.setBytes(index, src);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
         buf.setBytes(index, src, srcIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf setBytes(int index, ByteBuffer src) {
         buf.setBytes(index, src);
         return this;
     }
 
     @Override
     public int setBytes(int index, InputStream in, int length) throws IOException {
         return buf.setBytes(index, in, length);
     }
 
     @Override
     public int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
         return buf.setBytes(index, in, length);
     }
 
     @Override
     public ByteBuf setZero(int index, int length) {
         buf.setZero(index, length);
         return this;
     }
 
     @Override
     public boolean readBoolean() {
         return buf.readBoolean();
     }
 
     @Override
     public byte readByte() {
         return buf.readByte();
     }
 
     @Override
     public short readUnsignedByte() {
         return buf.readUnsignedByte();
     }
 
     @Override
     public short readShort() {
         return ByteBufUtil.swapShort(buf.readShort());
     }
 
     @Override
     public int readUnsignedShort() {
         return readShort() & 0xFFFF;
     }
 
     @Override
     public int readMedium() {
         return ByteBufUtil.swapMedium(buf.readMedium());
     }
 
     @Override
     public int readUnsignedMedium() {
         return readMedium() & 0xFFFFFF;
     }
 
     @Override
     public int readInt() {
         return ByteBufUtil.swapInt(buf.readInt());
     }
 
     @Override
     public long readUnsignedInt() {
         return readInt() & 0xFFFFFFFFL;
     }
 
     @Override
     public long readLong() {
         return ByteBufUtil.swapLong(buf.readLong());
     }
 
     @Override
     public char readChar() {
         return (char) readShort();
     }
 
     @Override
     public float readFloat() {
         return Float.intBitsToFloat(readInt());
     }
 
     @Override
     public double readDouble() {
         return Double.longBitsToDouble(readLong());
     }
 
     @Override
     public ByteBuf readBytes(int length) {
         return buf.readBytes(length).order(order());
     }
 
     @Override
     public ByteBuf readSlice(int length) {
         return buf.readSlice(length).order(order);
     }
 
     @Override
     public ByteBuf readBytes(ByteBuf dst) {
         buf.readBytes(dst);
         return this;
     }
 
     @Override
     public ByteBuf readBytes(ByteBuf dst, int length) {
         buf.readBytes(dst, length);
         return this;
     }
 
     @Override
     public ByteBuf readBytes(ByteBuf dst, int dstIndex, int length) {
         buf.readBytes(dst, dstIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf readBytes(byte[] dst) {
         buf.readBytes(dst);
         return this;
     }
 
     @Override
     public ByteBuf readBytes(byte[] dst, int dstIndex, int length) {
         buf.readBytes(dst, dstIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf readBytes(ByteBuffer dst) {
         buf.readBytes(dst);
         return this;
     }
 
     @Override
     public ByteBuf readBytes(OutputStream out, int length) throws IOException {
         buf.readBytes(out, length);
         return this;
     }
 
     @Override
     public int readBytes(GatheringByteChannel out, int length) throws IOException {
         return buf.readBytes(out, length);
     }
 
     @Override
     public ByteBuf skipBytes(int length) {
         buf.skipBytes(length);
         return this;
     }
 
     @Override
     public ByteBuf writeBoolean(boolean value) {
         buf.writeBoolean(value);
         return this;
     }
 
     @Override
     public ByteBuf writeByte(int value) {
         buf.writeByte(value);
         return this;
     }
 
     @Override
     public ByteBuf writeShort(int value) {
         buf.writeShort(ByteBufUtil.swapShort((short) value));
         return this;
     }
 
     @Override
     public ByteBuf writeMedium(int value) {
         buf.writeMedium(ByteBufUtil.swapMedium(value));
         return this;
     }
 
     @Override
     public ByteBuf writeInt(int value) {
         buf.writeInt(ByteBufUtil.swapInt(value));
         return this;
     }
 
     @Override
     public ByteBuf writeLong(long value) {
         buf.writeLong(ByteBufUtil.swapLong(value));
         return this;
     }
 
     @Override
     public ByteBuf writeChar(int value) {
         writeShort(value);
         return this;
     }
 
     @Override
     public ByteBuf writeFloat(float value) {
         writeInt(Float.floatToRawIntBits(value));
         return this;
     }
 
     @Override
     public ByteBuf writeDouble(double value) {
         writeLong(Double.doubleToRawLongBits(value));
         return this;
     }
 
     @Override
     public ByteBuf writeBytes(ByteBuf src) {
         buf.writeBytes(src);
         return this;
     }
 
     @Override
     public ByteBuf writeBytes(ByteBuf src, int length) {
         buf.writeBytes(src, length);
         return this;
     }
 
     @Override
     public ByteBuf writeBytes(ByteBuf src, int srcIndex, int length) {
         buf.writeBytes(src, srcIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf writeBytes(byte[] src) {
         buf.writeBytes(src);
         return this;
     }
 
     @Override
     public ByteBuf writeBytes(byte[] src, int srcIndex, int length) {
         buf.writeBytes(src, srcIndex, length);
         return this;
     }
 
     @Override
     public ByteBuf writeBytes(ByteBuffer src) {
         buf.writeBytes(src);
         return this;
     }
 
     @Override
     public int writeBytes(InputStream in, int length) throws IOException {
         return buf.writeBytes(in, length);
     }
 
     @Override
     public int writeBytes(ScatteringByteChannel in, int length) throws IOException {
         return buf.writeBytes(in, length);
     }
 
     @Override
     public ByteBuf writeZero(int length) {
         buf.writeZero(length);
         return this;
     }
 
     @Override
     public int indexOf(int fromIndex, int toIndex, byte value) {
         return buf.indexOf(fromIndex, toIndex, value);
     }
 
     @Override
     public int bytesBefore(byte value) {
         return buf.bytesBefore(value);
     }
 
     @Override
     public int bytesBefore(int length, byte value) {
         return buf.bytesBefore(length, value);
     }
 
     @Override
     public int bytesBefore(int index, int length, byte value) {
         return buf.bytesBefore(index, length, value);
     }
 
     @Override
     public int forEachByte(ByteBufProcessor processor) {
         return buf.forEachByte(processor);
     }
 
     @Override
     public int forEachByte(int index, int length, ByteBufProcessor processor) {
         return buf.forEachByte(index, length, processor);
     }
 
     @Override
     public int forEachByteDesc(ByteBufProcessor processor) {
         return buf.forEachByteDesc(processor);
     }
 
     @Override
     public int forEachByteDesc(int index, int length, ByteBufProcessor processor) {
         return buf.forEachByteDesc(index, length, processor);
     }
 
     @Override
     public ByteBuf copy() {
         return buf.copy().order(order);
     }
 
     @Override
     public ByteBuf copy(int index, int length) {
         return buf.copy(index, length).order(order);
     }
 
     @Override
     public ByteBuf slice() {
         return buf.slice().order(order);
     }
 
     @Override
     public ByteBuf slice(int index, int length) {
         return buf.slice(index, length).order(order);
     }
 
     @Override
     public ByteBuf duplicate() {
         return buf.duplicate().order(order);
     }
 
     @Override
     public int nioBufferCount() {
         return buf.nioBufferCount();
     }
 
     @Override
     public ByteBuffer nioBuffer() {
         return buf.nioBuffer().order(order);
     }
 
     @Override
     public ByteBuffer nioBuffer(int index, int length) {
         return buf.nioBuffer(index, length).order(order);
     }
 
     @Override
     public ByteBuffer internalNioBuffer(int index, int length) {
         return nioBuffer(index, length);
     }
 
     @Override
     public ByteBuffer[] nioBuffers() {
         ByteBuffer[] nioBuffers = buf.nioBuffers();
         for (int i = 0; i < nioBuffers.length; i++) {
             nioBuffers[i] = nioBuffers[i].order(order);
         }
         return nioBuffers;
     }
 
     @Override
     public ByteBuffer[] nioBuffers(int index, int length) {
         ByteBuffer[] nioBuffers = buf.nioBuffers(index, length);
         for (int i = 0; i < nioBuffers.length; i++) {
             nioBuffers[i] = nioBuffers[i].order(order);
         }
         return nioBuffers;
     }
 
     @Override
     public boolean hasArray() {
         return buf.hasArray();
     }
 
     @Override
     public byte[] array() {
         return buf.array();
     }
 
     @Override
     public int arrayOffset() {
         return buf.arrayOffset();
     }
 
     @Override
     public boolean hasMemoryAddress() {
         return buf.hasMemoryAddress();
     }
 
     @Override
     public long memoryAddress() {
         return buf.memoryAddress();
     }
 
     @Override
     public String toString(Charset charset) {
         return buf.toString(charset);
     }
 
     @Override
     public String toString(int index, int length, Charset charset) {
         return buf.toString(index, length, charset);
     }
 
     @Override
     public int refCnt() {
         return buf.refCnt();
     }
 
     @Override
     public ByteBuf retain() {
         buf.retain();
         return this;
     }
 
     @Override
     public ByteBuf retain(int increment) {
         buf.retain(increment);
         return this;
     }
 
     @Override
     public boolean release() {
         return buf.release();
     }
 
     @Override
     public boolean release(int decrement) {
         return buf.release(decrement);
     }
 
     @Override
     public int hashCode() {
         return buf.hashCode();
     }
 
     @Override
     public boolean equals(Object obj) {
         if (this == obj) {
             return true;
         }
         if (obj instanceof ByteBuf) {
             return ByteBufUtil.equals(this, (ByteBuf) obj);
         }
         return false;
     }
 
     @Override
     public int compareTo(ByteBuf buffer) {
         return ByteBufUtil.compare(this, buffer);
     }
 
     @Override
     public String toString() {
         return "Swapped(" + buf.toString() + ')';
     }
 }