/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

* 

* Description:

*

*/

using System;

using System.IO;

using System.Text;

namespace SymbianUtils

{

	public class TracePrefixAnalyser

	{

		#region Constructors

		public TracePrefixAnalyser()

		{

		}

		#endregion

		#region API

		public bool CleanLine( ref string aLine )

		{

			bool matched = false;

			string prefix = IdentifyTracePrefixFromLine( aLine );

			//

			if	( prefix.Length > 0 )

			{

				int prefixPos = aLine.IndexOf( prefix );

				aLine = aLine.Substring( prefixPos + prefix.Length );

				matched = true;

			}

			//

			return matched;

		}

		public StringBuilder CleanFile( string aFileName )

		{

			StringBuilder lines = new StringBuilder();

			//

			using( StreamReader reader = new StreamReader( aFileName ) )

			{

				string line = reader.ReadLine();

				while( line != null )

				{

					CleanLine( ref line );

					lines.Append( line + System.Environment.NewLine );

					//

					line = reader.ReadLine();

				}

			}

			//

			return lines;

		}

		public string IdentifyTracePrefixFromLine( string aLine )

		{

			string prefix = string.Empty;

			//

            if ( aLine.IndexOf( KFinalPrefix ) >= 0 )

            {

                prefix = KFinalPrefix;

            }

			//

			return prefix;

		}

		public string IdentifyTracePrefix( string aFileName )

		{

			string prefix = string.Empty;

			//

			try

			{

				using( StreamReader reader = new StreamReader( aFileName ) )

				{

					int lineCounter = 0;

					string line = string.Empty;

					//

					while( lineCounter < KNumberOfLinesToCheck && line != null )

					{

						try

						{

							line = reader.ReadLine();

							//

                            if ( line != null )

                            {

                                string tmp = IdentifyTracePrefixFromLine( line );

                                if ( tmp.Length > 0 )

                                {

                                    prefix = tmp;

                                    break;

                                }

                            }

						}

						catch(Exception)

						{

							line = null;

						}

                        //

                        ++lineCounter;

					}

				}

			}

			catch( Exception )

			{

			}

			//

			return prefix;

		}

		#endregion

		#region Internal constants

		private const int KNumberOfLinesToCheck = 500;

		#endregion

		#region Data members

		private const int KLineLookAheadCount = 200;

		private const string KFinalPrefix = "msg:";

		#endregion

	}

}