/*
    * Copyright 2013 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.handler.codec.spdy;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.util.IllegalReferenceCountException;
  import io.netty.util.internal.StringUtil;
  
  /**
   * The default {@link SpdyDataFrame} implementation.
   */
  public class DefaultSpdyDataFrame extends DefaultSpdyStreamFrame implements SpdyDataFrame {
  
      private final ByteBuf data;
  
      /**
       * Creates a new instance.
       *
       * @param streamId the Stream-ID of this frame
       */
      public DefaultSpdyDataFrame(int streamId) {
          this(streamId, Unpooled.buffer(0));
      }
  
      /**
       * Creates a new instance.
       *
       * @param streamId  the Stream-ID of this frame
       * @param data      the payload of the frame. Can not exceed {@link SpdyCodecUtil#SPDY_MAX_LENGTH}
       */
      public DefaultSpdyDataFrame(int streamId, ByteBuf data) {
          super(streamId);
          if (data == null) {
              throw new NullPointerException("data");
          }
          this.data = validate(data);
      }
  
      private static ByteBuf validate(ByteBuf data) {
          if (data.readableBytes() > SpdyCodecUtil.SPDY_MAX_LENGTH) {
              throw new IllegalArgumentException("data payload cannot exceed "
                      + SpdyCodecUtil.SPDY_MAX_LENGTH + " bytes");
          }
          return data;
      }
  
      @Override
      public SpdyDataFrame setStreamId(int streamId) {
          super.setStreamId(streamId);
          return this;
      }
  
      @Override
      public SpdyDataFrame setLast(boolean last) {
          super.setLast(last);
          return this;
      }
  
      @Override
      public ByteBuf content() {
          if (data.refCnt() <= 0) {
              throw new IllegalReferenceCountException(data.refCnt());
          }
          return data;
      }
  
      @Override
      public SpdyDataFrame copy() {
          SpdyDataFrame frame = new DefaultSpdyDataFrame(streamId(), content().copy());
          frame.setLast(isLast());
          return frame;
      }
  
      @Override
      public SpdyDataFrame duplicate() {
          SpdyDataFrame frame = new DefaultSpdyDataFrame(streamId(), content().duplicate());
          frame.setLast(isLast());
          return frame;
      }
  
      @Override
      public int refCnt() {
          return data.refCnt();
      }
  
     @Override
     public SpdyDataFrame retain() {
         data.retain();
         return this;
     }
 
     @Override
     public SpdyDataFrame retain(int increment) {
         data.retain(increment);
         return this;
     }
 
     @Override
     public boolean release() {
         return data.release();
     }
 
     @Override
     public boolean release(int decrement) {
         return data.release(decrement);
     }
 
     @Override
     public String toString() {
         StringBuilder buf = new StringBuilder()
             .append(StringUtil.simpleClassName(this))
             .append("(last: ")
             .append(isLast())
             .append(')')
             .append(StringUtil.NEWLINE)
             .append("--> Stream-ID = ")
             .append(streamId())
             .append(StringUtil.NEWLINE)
             .append("--> Size = ");
         if (refCnt() == 0) {
             buf.append("(freed)");
         } else {
             buf.append(content().readableBytes());
         }
         return buf.toString();
     }
 }