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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
*
*/
using System;
using System.IO;
namespace org.apache.qpid.transport.network
{
public sealed class Frame : INetworkEvent
{
internal static int HEADER_SIZE = 12;
// XXX: enums?
public const byte L1 = 0;
public const byte L2 = 1;
public const byte L3 = 2;
public const byte L4 = 3;
public static byte RESERVED = 0x0;
public static byte VERSION = 0x0;
public static byte FIRST_SEG = 0x8;
public static byte LAST_SEG = 0x4;
public static byte FIRST_FRAME = 0x2;
public static byte LAST_FRAME = 0x1;
private readonly byte flags;
private readonly SegmentType type;
private readonly byte track;
private readonly int channel;
private readonly MemoryStream body;
private int _bodySize;
public Frame(byte flags, SegmentType type, byte track, int channel, int bodySize,
MemoryStream body)
{
this.flags = flags;
this.type = type;
this.track = track;
this.channel = channel;
this.body = body;
_bodySize = bodySize;
}
public int BodySize
{
get { return _bodySize; }
}
public MemoryStream Body
{
get { return body; }
}
public byte Flags
{
get { return flags; }
}
public int Channel
{
get { return channel; }
}
public int Size
{
get { return (int) body.Length;}
}
public SegmentType Type
{
get { return type; }
}
public byte Track
{
get { return track; }
}
private bool Flag(byte mask)
{
return (flags & mask) != 0;
}
public bool IsFirstSegment()
{
return Flag(FIRST_SEG);
}
public bool IsLastSegment()
{
return Flag(LAST_SEG);
}
public bool IsFirstFrame()
{
return Flag(FIRST_FRAME);
}
public bool IsLastFrame()
{
return Flag(LAST_FRAME);
}
#region INetworkEvent Methods
public void ProcessNetworkEvent(INetworkDelegate ndelegate)
{
ndelegate.Frame(this);
}
#endregion
public override String ToString()
{
return String.Format
("[{0:d} {1:d} {2:d} {3} {4}{5}{6}{7}] ", Channel, Size, Track, Type,
IsFirstSegment() ? 1 : 0, IsLastSegment() ? 1 : 0,
IsFirstFrame() ? 1 : 0, IsLastFrame() ? 1 : 0);
}
}
}
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