1 files changed, 87 insertions, 0 deletions
diff --git a/src/main/java/com/btr/proxy/util/Logger.java b/src/main/java/com/btr/proxy/util/Logger.java
new file mode 100644
index 0000000..f434699
--- /dev/null
+++ b/src/main/java/com/btr/proxy/util/Logger.java
@@ -0,0 +1,87 @@
+package com.btr.proxy.util;
+
+import java.text.MessageFormat;
+
+/*****************************************************************************
+ * Simple logging support for the framework.
+ * You need to add an logging listener that needs to send the logging events
+ * to an backend.
+ *
+ * @author Bernd Rosstauscher (proxyvole@rosstauscher.de) Copyright 2009
+ ****************************************************************************/
+
+public class Logger {
+	
+	public enum LogLevel {ERROR, WARNING, INFO, TRACE, DEBUG}
+
+	/*****************************************************************************
+	 * Interface for an logging backend that can be attached to the logger.
+	 ****************************************************************************/
+	
+	public interface LogBackEnd {
+		
+		/*************************************************************************
+		 * Invoked for every logging event.
+		 * @param clazz the class that sends the log message.
+		 * @param loglevel the logging level.
+		 * @param msg the message format string.
+		 * @param params the message parameters for the format string.
+		 ************************************************************************/
+		
+		public void log(Class<?> clazz, LogLevel loglevel, String msg, Object ...params);
+
+		/*************************************************************************
+		 * Can be used to test if a given logging level is enabled.  
+		 * @param logLevel the loglevel to test.
+		 * @return true if enabled, else false.
+		 ************************************************************************/
+		
+		public boolean isLogginEnabled(LogLevel logLevel);
+	}
+	
+	private static LogBackEnd backend;
+	
+	/*************************************************************************
+	 * Gets the currently attached logging backend.
+	 * @return Returns the backend.
+	 ************************************************************************/
+	
+	public static LogBackEnd getBackend() {
+		return backend;
+	}
+
+	/*************************************************************************
+	 * Attaches a new logging backend replacing the existing one.
+	 * @param backend The backend to set.
+	 ************************************************************************/
+	
+	public static void setBackend(LogBackEnd backend) {
+		Logger.backend = backend;
+	}
+
+	/*************************************************************************
+	 * Logs a message.
+	 * @param clazz the class that sends the log message.
+	 * @param loglevel the logging level.
+	 * @param msg the message format string.
+	 * @param params the message parameters for the format string.
+	 ************************************************************************/
+	
+	public static void log(Class<?> clazz, LogLevel loglevel, String msg, Object ...params) {
+		System.out.println(MessageFormat.format(msg, params));
+	}
+	
+	/*************************************************************************
+	 * Can be used to test if a given logging level is enabled.  
+	 * @param logLevel the loglevel to test.
+	 * @return true if enabled, else false.
+	 ************************************************************************/
+	
+	public static boolean isLogginEnabled(LogLevel logLevel) {
+		if (backend != null) {
+			return backend.isLogginEnabled(logLevel);
+		}
+		return false;
+	}
+
+}