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using System;
using System.Collections.Generic;
using System.Text;
namespace LumiSoft.Net.SIP.Message
{
/// <summary>
/// Implements SIP "Cseq" value. Defined in RFC 3261.
/// A CSeq in a request contains a single decimal sequence number and
/// the request method. The method part of CSeq is case-sensitive. The CSeq header
/// field serves to order transactions within a dialog, to provide a means to uniquely
/// identify transactions, and to differentiate between new requests and request retransmissions.
/// </summary>
/// <remarks>
/// <code>
/// RFC 3261 Syntax:
/// CSeq = 1*DIGIT LWS Method
/// </code>
/// </remarks>
public class SIP_t_CSeq : SIP_t_Value
{
private int m_SequenceNumber = 1;
private string m_RequestMethod = "";
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="value">CSeq: header field value.</param>
public SIP_t_CSeq(string value)
{
Parse(new StringReader(value));
}
/// <summary>
/// Default constructor.
/// </summary>
/// <param name="sequenceNumber">Command sequence number.</param>
/// <param name="requestMethod">Request method.</param>
public SIP_t_CSeq(int sequenceNumber,string requestMethod)
{
m_SequenceNumber = sequenceNumber;
m_RequestMethod = requestMethod;
}
#region method Parse
/// <summary>
/// Parses "CSeq" from specified value.
/// </summary>
/// <param name="value">SIP "CSeq" value.</param>
/// <exception cref="ArgumentNullException">Raised when <b>value</b> is null.</exception>
/// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
public void Parse(string value)
{
if(value == null){
throw new ArgumentNullException("value");
}
Parse(new StringReader(value));
}
/// <summary>
/// Parses "CSeq" from specified reader.
/// </summary>
/// <param name="reader">Reader from where to parse.</param>
/// <exception cref="ArgumentNullException">Raised when <b>reader</b> is null.</exception>
/// <exception cref="SIP_ParseException">Raised when invalid SIP message.</exception>
public override void Parse(StringReader reader)
{
// CSeq = 1*DIGIT LWS Method
if(reader == null){
throw new ArgumentNullException("reader");
}
// Get sequence number
string word = reader.ReadWord();
if(word == null){
throw new SIP_ParseException("Invalid 'CSeq' value, sequence number is missing !");
}
try{
m_SequenceNumber = Convert.ToInt32(word);
}
catch{
throw new SIP_ParseException("Invalid CSeq 'sequence number' value !");
}
// Get request method
word = reader.ReadWord();
if(word == null){
throw new SIP_ParseException("Invalid 'CSeq' value, request method is missing !");
}
m_RequestMethod = word;
}
#endregion
#region method ToStringValue
/// <summary>
/// Converts this to valid "CSeq" value.
/// </summary>
/// <returns>Returns "CSeq" value.</returns>
public override string ToStringValue()
{
return m_SequenceNumber + " " + m_RequestMethod;
}
#endregion
#region Properties Implementation
/// <summary>
/// Gets or sets sequence number.
/// </summary>
public int SequenceNumber
{
get{ return m_SequenceNumber; }
set{
if(value < 1){
throw new ArgumentException("Property SequenceNumber value must be >= 1 !");
}
m_SequenceNumber = value;
}
}
/// <summary>
/// Gets or sets request method. Note: this value is case-sensitive !
/// </summary>
public string RequestMethod
{
get{ return m_RequestMethod; }
set{
if(string.IsNullOrEmpty(value)){
throw new ArgumentException("Property RequestMethod value can't be null or empty !");
}
m_RequestMethod = value;
}
}
#endregion
}
}
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