SimpleLog/SimpleLog/Src/LogHandlers/FileLogHandler.cs

using System;
using System.IO;
using SimpleLog.Framework;

namespace SimpleLog.LogHandlers {
	public class FileLogHandler : ILogHandler {

		protected IMessageHandler messageHandler;
		protected LogLevel? logLevel;

		protected string logDirectory;
		protected string filePrefix;
		protected string fileSuffix;

		#region Constructors
		/// <summary>
		/// Constructs a new FileLogHandler with the default
		/// log directory (temp directory), prefix (log) and
		/// suffix (.log)
		/// </summary>
		public FileLogHandler() : this(Path.GetTempPath(), "log", ".log") {

		}

		/// <summary>
		/// Constructs a new FileLogHandler
		/// </summary>
		/// <param name="dir">The directory to log to</param>
		/// <param name="prefix">The file prefix</param>
		/// <param name="suffix">The file suffix (e.g. ".log")</param>
		public FileLogHandler(string dir, string prefix, string suffix) {
			this.messageHandler = new DefaultMessageHandler();
			this.logLevel = null;
			this.logDirectory = dir;
			this.filePrefix = prefix;
			this.fileSuffix = suffix;
		}
		#endregion

		#region ILogHandler Members
		/// <summary>
		/// Gracefully shuts down the log handler
		/// </summary>
		public void GracefulShutDown() {
			throw new NotImplementedException();
		}

		/// <summary>
		/// Gets or sets the log level
		/// </summary>
		public LogLevel? LogLevel {
			get {
				return this.logLevel;
			}
			set {
				this.logLevel = value;
			}
		}

		/// <summary>
		/// Logs a message to a file defined by LogDirectory, FilePrefix and 
		/// FileSuffix (see BuildFileName()) at the specified log level
		/// </summary>
		/// <param name="message">The message to log</param>
		/// <param name="level">The log level</param>
		public virtual bool Log(string message, LogLevel level) {
			string fileName = this.BuildFileName();

			try {
				File.AppendAllText(fileName, message);
			}
			catch (Exception) {
				return false;
			}

			return true;
		}

		/// <summary>
		/// Gets or sets the message handler used by this log handler
		/// </summary>
		public IMessageHandler MessageHandler {
			get {
				return this.messageHandler;
			}
			set {
				this.messageHandler = value;
			}
		}
		#endregion

		/// <summary>
		/// Builds the log file name
		/// </summary>
		protected virtual string BuildFileName() {
			string fileName = this.logDirectory + Path.DirectorySeparatorChar + this.FilePrefix;
			fileName += "_" + string.Format("{0:yyyyMMdd}", DateTime.Now) + this.FileSuffix;
			return fileName;
		}

		/// <summary>
		/// Gets or sets the directory to log to
		/// </summary>
		public string LogDirectory {
			get {
				return this.logDirectory;
			}
			set {
				this.logDirectory = value;
			}
		}

		/// <summary>
		/// Gets or sets the filename prefix
		/// </summary>
		public string FilePrefix {
			get {
				return this.filePrefix;
			}
			set {
				this.filePrefix = value;
			}
		}

		/// <summary>
		/// Gets or sets the filename suffix
		/// </summary>
		public string FileSuffix {
			get {
				return this.fileSuffix;
			}
			set {
				this.fileSuffix = value;
			}
		}
		
	}
}