/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to 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 io.netty.util.Recycler;
  import io.netty.util.internal.PlatformDependent;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.nio.channels.ClosedChannelException;
  import java.nio.channels.GatheringByteChannel;
  import java.nio.channels.ScatteringByteChannel;
  
  class PooledHeapByteBuf extends PooledByteBuf<byte[]> {
  
      private static final Recycler<PooledHeapByteBuf> RECYCLER = new Recycler<PooledHeapByteBuf>() {
          @Override
          protected PooledHeapByteBuf newObject(Handle handle) {
              return new PooledHeapByteBuf(handle, 0);
          }
      };
  
      static PooledHeapByteBuf newInstance(int maxCapacity) {
          PooledHeapByteBuf buf = RECYCLER.get();
          buf.reuse(maxCapacity);
          return buf;
      }
  
      PooledHeapByteBuf(Recycler.Handle recyclerHandle, int maxCapacity) {
          super(recyclerHandle, maxCapacity);
      }
  
      @Override
      public final boolean isDirect() {
          return false;
      }
  
      @Override
      protected byte _getByte(int index) {
          return HeapByteBufUtil.getByte(memory, idx(index));
      }
  
      @Override
      protected short _getShort(int index) {
          return HeapByteBufUtil.getShort(memory, idx(index));
      }
  
      @Override
      protected int _getUnsignedMedium(int index) {
          return HeapByteBufUtil.getUnsignedMedium(memory, idx(index));
      }
  
      @Override
      protected int _getInt(int index) {
          return HeapByteBufUtil.getInt(memory, idx(index));
      }
  
      @Override
      protected long _getLong(int index) {
          return HeapByteBufUtil.getLong(memory, idx(index));
      }
  
      @Override
      public final ByteBuf getBytes(int index, ByteBuf dst, int dstIndex, int length) {
          checkDstIndex(index, length, dstIndex, dst.capacity());
          if (dst.hasMemoryAddress()) {
              PlatformDependent.copyMemory(memory, idx(index), dst.memoryAddress() + dstIndex, length);
          } else if (dst.hasArray()) {
              getBytes(index, dst.array(), dst.arrayOffset() + dstIndex, length);
          } else {
              dst.setBytes(dstIndex, memory, idx(index), length);
          }
          return this;
      }
  
      @Override
      public final ByteBuf getBytes(int index, byte[] dst, int dstIndex, int length) {
          checkDstIndex(index, length, dstIndex, dst.length);
          System.arraycopy(memory, idx(index), dst, dstIndex, length);
          return this;
      }
  
      @Override
      public final ByteBuf getBytes(int index, ByteBuffer dst) {
          checkIndex(index, dst.remaining());
         dst.put(memory, idx(index), dst.remaining());
         return this;
     }
 
     @Override
     public final ByteBuf getBytes(int index, OutputStream out, int length) throws IOException {
         checkIndex(index, length);
         out.write(memory, idx(index), length);
         return this;
     }
 
     @Override
     public final int getBytes(int index, GatheringByteChannel out, int length) throws IOException {
         return getBytes(index, out, length, false);
     }
 
     private int getBytes(int index, GatheringByteChannel out, int length, boolean internal) throws IOException {
         checkIndex(index, length);
         index = idx(index);
         ByteBuffer tmpBuf;
         if (internal) {
             tmpBuf = internalNioBuffer();
         } else {
             tmpBuf = ByteBuffer.wrap(memory);
         }
         return out.write((ByteBuffer) tmpBuf.clear().position(index).limit(index + length));
     }
 
     @Override
     public final int readBytes(GatheringByteChannel out, int length) throws IOException {
         checkReadableBytes(length);
         int readBytes = getBytes(readerIndex, out, length, true);
         readerIndex += readBytes;
         return readBytes;
     }
 
     @Override
     protected void _setByte(int index, int value) {
         HeapByteBufUtil.setByte(memory, idx(index), value);
     }
 
     @Override
     protected void _setShort(int index, int value) {
         HeapByteBufUtil.setShort(memory, idx(index), value);
     }
 
     @Override
     protected void _setMedium(int index, int   value) {
         HeapByteBufUtil.setMedium(memory, idx(index), value);
     }
 
     @Override
     protected void _setInt(int index, int   value) {
         HeapByteBufUtil.setInt(memory, idx(index), value);
     }
 
     @Override
     protected void _setLong(int index, long  value) {
         HeapByteBufUtil.setLong(memory, idx(index), value);
     }
 
     @Override
     public final ByteBuf setBytes(int index, ByteBuf src, int srcIndex, int length) {
         checkSrcIndex(index, length, srcIndex, src.capacity());
         if (src.hasMemoryAddress()) {
             PlatformDependent.copyMemory(src.memoryAddress() + srcIndex, memory, idx(index), length);
         } else if (src.hasArray()) {
             setBytes(index, src.array(), src.arrayOffset() + srcIndex, length);
         } else {
             src.getBytes(srcIndex, memory, idx(index), length);
         }
         return this;
     }
 
     @Override
     public final ByteBuf setBytes(int index, byte[] src, int srcIndex, int length) {
         checkSrcIndex(index, length, srcIndex, src.length);
         System.arraycopy(src, srcIndex, memory, idx(index), length);
         return this;
     }
 
     @Override
     public final ByteBuf setBytes(int index, ByteBuffer src) {
         int length = src.remaining();
         checkIndex(index, length);
         src.get(memory, idx(index), length);
         return this;
     }
 
     @Override
     public final int setBytes(int index, InputStream in, int length) throws IOException {
         checkIndex(index, length);
         return in.read(memory, idx(index), length);
     }
 
     @Override
     public final int setBytes(int index, ScatteringByteChannel in, int length) throws IOException {
         checkIndex(index, length);
         index = idx(index);
         try {
             return in.read((ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length));
         } catch (ClosedChannelException ignored) {
             return -1;
         }
     }
 
     @Override
     public final ByteBuf copy(int index, int length) {
         checkIndex(index, length);
         ByteBuf copy = alloc().heapBuffer(length, maxCapacity());
         copy.writeBytes(memory, idx(index), length);
         return copy;
     }
 
     @Override
     public final int nioBufferCount() {
         return 1;
     }
 
     @Override
     public final ByteBuffer[] nioBuffers(int index, int length) {
         return new ByteBuffer[] { nioBuffer(index, length) };
     }
 
     @Override
     public final ByteBuffer nioBuffer(int index, int length) {
         checkIndex(index, length);
         index = idx(index);
         ByteBuffer buf =  ByteBuffer.wrap(memory, index, length);
         return buf.slice();
     }
 
     @Override
     public final ByteBuffer internalNioBuffer(int index, int length) {
         checkIndex(index, length);
         index = idx(index);
         return (ByteBuffer) internalNioBuffer().clear().position(index).limit(index + length);
     }
 
     @Override
     public final boolean hasArray() {
         return true;
     }
 
     @Override
     public final byte[] array() {
         ensureAccessible();
         return memory;
     }
 
     @Override
     public final int arrayOffset() {
         return offset;
     }
 
     @Override
     public final boolean hasMemoryAddress() {
         return false;
     }
 
     @Override
     public final long memoryAddress() {
         throw new UnsupportedOperationException();
     }
 
     @Override
     protected final ByteBuffer newInternalNioBuffer(byte[] memory) {
         return ByteBuffer.wrap(memory);
     }
 
     @Override
     protected Recycler<?> recycler() {
         return RECYCLER;
     }
 }