Adding log level control

src/main/java/com/bwssystems/logservices/LoggingUtil.java

@@ -0,0 +1,198 @@
+package com.bwssystems.logservices;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.Iterator;
+import java.util.List;
+
+import com.bwssystems.logservices.LogFileInfo;
+import org.slf4j.LoggerFactory;
+
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.Appender;
+import ch.qos.logback.core.FileAppender;
+
+/**
+ * Contains utility methods to interact with the logback during runtime.
+ */
+public class LoggingUtil {
+
+	/**
+	 * re-defines the logback logging levels as a Java enumeration. This is quite
+	 * helpful if you need to render the various log-levels as select-box. I wish
+	 * logback @see {@link ch.qos.logback.classic.Level} would not use static variables
+	 * but use enums instead. 
+	 */
+	public enum LogLevels {
+
+		OFF(Integer.MAX_VALUE, "Off"),
+		ERROR_INT(40000, "Error"),
+		WARN_INT(30000, "Warn"),
+		INFO_INT(20000, "Info"),
+		DEBUG_INT(10000, "Debug"),
+		TRACE(5000, "Trace"),
+		ALL(Integer.MIN_VALUE, "All");
+
+		private int logLevel;	
+		private String logLevelName;
+
+		LogLevels(final int logLevel, final String logLevelName) {
+			this.logLevel = logLevel;
+			this.logLevelName = logLevelName; 
+		}
+
+		public int getLogLevel() {
+			return this.logLevel;
+		}
+
+		public String getLogLevelName() {
+			return this.logLevelName;
+		}
+
+		public static LogLevels getLogLevelFromId(final int logLevelAsInt) {
+
+			for (LogLevels logLevel : LogLevels.values()) {
+
+				if (logLevelAsInt == logLevel.logLevel) {
+					return logLevel;
+				}
+			}
+
+			throw new IllegalStateException("Loglevel " + logLevelAsInt + " does not exist.");
+
+		}
+
+		@Override
+		public String toString() {
+			return this.logLevelName;
+		}
+	}
+	
+	/**
+	 * Retrieve all configured logback loggers. 
+	 * 
+	 * @param showAll If set return ALL loggers, not only the configured ones.
+	 * @return List of Loggers
+	 */
+	public static List<ch.qos.logback.classic.Logger> getLoggers(final boolean showAll) {
+
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+		final List<ch.qos.logback.classic.Logger> loggers = new ArrayList<ch.qos.logback.classic.Logger>();
+
+		for (ch.qos.logback.classic.Logger log : lc.getLoggerList()) {
+			if(showAll == false) {
+				if(log.getLevel() != null || LoggingUtil.hasAppenders(log)) {
+					loggers.add(log);
+				}
+			} else {
+				loggers.add(log);
+			}
+		}
+
+		return loggers;
+	}
+
+	/**
+	 * Get a single logger. 
+	 * 
+	 * @return Logger
+	 */
+	public static ch.qos.logback.classic.Logger getLogger(final String loggerName) {
+
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+
+		return lc.getLogger(loggerName);
+		
+	}
+	
+	/** 
+	 * Test whether the provided logger has appenders. 
+	 * 
+	 * @param logger The logger to test
+	 * @return true if the logger has appenders.
+	 */
+	public static boolean hasAppenders(ch.qos.logback.classic.Logger logger) {
+		Iterator<Appender<ILoggingEvent>> it = logger.iteratorForAppenders();
+		return it.hasNext();
+	}
+
+	/**
+	 * Get the logfile information for the roor logger.
+	 * 
+	 * @return List of LogFileInfo obejcts
+	 */
+	public static List<LogFileInfo> getLogFileInfos() {
+		
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+
+		final List<LogFileInfo> logFileInfos = new ArrayList<LogFileInfo>();
+
+		final Logger logger = lc.getLogger(Logger.ROOT_LOGGER_NAME);
+
+		final Iterator<Appender<ILoggingEvent>> it = logger.iteratorForAppenders();
+
+		while (it.hasNext()) {
+
+			final Appender<ILoggingEvent> appender = it.next();
+
+			if (appender instanceof FileAppender) {
+
+				final FileAppender<ILoggingEvent> fileAppender = (FileAppender<ILoggingEvent>) appender;
+
+				final File logFile = new File(fileAppender.getFile());
+				final LogFileInfo logFileInfo = new LogFileInfo();
+
+				logFileInfo.setFileName(logFile.getName());
+				logFileInfo.setFileLastChanged(new Date(logFile.lastModified()));
+				logFileInfo.setFileSize(logFile.length());
+				logFileInfos.add(logFileInfo);
+			}
+
+		}
+
+		return logFileInfos;
+	}
+
+	/**
+	 * Get the log file.
+	 * 
+	 * @param logFileName The name of the log file 
+	 * @return The actual file
+	 */
+	public static File getLogFile(final String logFileName) {
+
+		if (logFileName == null) {
+			throw new IllegalArgumentException("logFileName cannot be null.");
+		}
+
+		final LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
+
+		final Logger logger = lc.getLogger(Logger.ROOT_LOGGER_NAME);
+
+		final Iterator<Appender<ILoggingEvent>> it = logger.iteratorForAppenders();
+
+		while (it.hasNext()) {
+
+			final Appender<ILoggingEvent> appender = it.next();
+
+			if (appender instanceof FileAppender) {
+
+				final FileAppender<ILoggingEvent> fileAppender = (FileAppender<ILoggingEvent>) appender;
+
+				final File logFile = new File(fileAppender.getFile());
+
+				if (logFile.getName().equalsIgnoreCase(logFileName)) {
+					return logFile;
+				}
+
+			}
+
+		}
+
+		return null;
+	}
+
+}