/*
    * 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 org.jboss.netty.handler.codec.spdy;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.buffer.ChannelBuffers;
  import org.jboss.netty.util.internal.StringUtil;
  
  /**
   * The default {@link SpdyDataFrame} implementation.
   */
  public class DefaultSpdyDataFrame extends DefaultSpdyStreamFrame implements SpdyDataFrame {
  
      private ChannelBuffer data = ChannelBuffers.EMPTY_BUFFER;
  
      /**
       * Creates a new instance.
       *
       * @param streamId the Stream-ID of this frame
       */
      public DefaultSpdyDataFrame(int streamId) {
          super(streamId);
      }
  
      public ChannelBuffer getData() {
          return data;
      }
  
      public void setData(ChannelBuffer data) {
          if (data == null) {
              data = ChannelBuffers.EMPTY_BUFFER;
          }
          if (data.readableBytes() > SpdyCodecUtil.SPDY_MAX_LENGTH) {
              throw new IllegalArgumentException("data payload cannot exceed "
                      + SpdyCodecUtil.SPDY_MAX_LENGTH + " bytes");
          }
          this.data = data;
      }
  
      @Override
      public String toString() {
          StringBuilder buf = new StringBuilder();
          buf.append(getClass().getSimpleName());
          buf.append("(last: ");
          buf.append(isLast());
          buf.append(')');
          buf.append(StringUtil.NEWLINE);
          buf.append("--> Stream-ID = ");
          buf.append(getStreamId());
          buf.append(StringUtil.NEWLINE);
          buf.append("--> Size = ");
          buf.append(getData().readableBytes());
          return buf.toString();
      }
  }