Implementation of {@link Log} that maps directly to a Log4J + * Logger. Initial configuration of the corresponding + * Logger instances should be done in the usual manner, as outlined in + * the Log4J documentation.
+ * + * @author Scott Sanders + * @author Rod Waldhoff + * @author Robert Burrell Donkin + * @version $Id: Log4JLogger.java,v 1.1 2002/11/23 03:50:13 craigmcc Exp $ + */ +public final class Log4JLogger implements Log { + + + // ------------------------------------------------------------- Attributes + + /** The fully qualified name of the Log4JLogger class. */ + private static final String FQCN = Log4JLogger.class.getName(); + + private static boolean initialized=false; + private static String LAYOUT="%r [%t] %p %c{2} %x - %m%n"; + + /** Log to this logger */ + private Logger logger = null; + + + // ------------------------------------------------------------ Constructor + + public Log4JLogger() { + if( ! initialized ) { + initialize(); + } + } + + + /** + * Base constructor + */ + public Log4JLogger(String name) { + if( ! initialized ) { + initialize(); + } + this.logger=Logger.getLogger(name); + } + + /** For use with a log4j factory + */ + public Log4JLogger(Logger logger ) { + if( ! initialized ) { + initialize(); + } + this.logger=logger; + } + + + // ---------------------------------------------------------- Implmentation + + private void initialize() { + Logger root=Logger.getRootLogger(); + Enumeration appenders=root.getAllAppenders(); + if( appenders==null || ! appenders.hasMoreElements() ) { + // No config, set some defaults ( consistent with + // commons-logging patterns ). + ConsoleAppender app=new ConsoleAppender(new PatternLayout( LAYOUT ), + ConsoleAppender.SYSTEM_ERR ); + app.setName("commons-logging"); + + root.addAppender( app ); + root.setPriority( Priority.INFO ); + } + initialized=true; + } + + + /** + * Log a message to the Log4j Logger withTRACE priority.
+ * Currently logs to DEBUG level in Log4J.
+ */
+ public void trace(Object message) {
+ logger.log(FQCN, Priority.DEBUG, message, null);
+ }
+
+
+ /**
+ * Log an error to the Log4j Logger with TRACE priority.
+ * Currently logs to DEBUG level in Log4J.
+ */
+ public void trace(Object message, Throwable t) {
+ logger.log(FQCN, Priority.DEBUG, message, t );
+ }
+
+
+ /**
+ * Log a message to the Log4j Logger with DEBUG priority.
+ */
+ public void debug(Object message) {
+ logger.log(FQCN, Priority.DEBUG, message, null);
+ }
+
+ /**
+ * Log an error to the Log4j Logger with DEBUG priority.
+ */
+ public void debug(Object message, Throwable t) {
+ logger.log(FQCN, Priority.DEBUG, message, t );
+ }
+
+
+ /**
+ * Log a message to the Log4j Logger with INFO priority.
+ */
+ public void info(Object message) {
+ logger.log(FQCN, Priority.INFO, message, null );
+ }
+
+
+ /**
+ * Log an error to the Log4j Logger with INFO priority.
+ */
+ public void info(Object message, Throwable t) {
+ logger.log(FQCN, Priority.INFO, message, t );
+ }
+
+
+ /**
+ * Log a message to the Log4j Logger with WARN priority.
+ */
+ public void warn(Object message) {
+ logger.log(FQCN, Priority.WARN, message, null );
+ }
+
+
+ /**
+ * Log an error to the Log4j Logger with WARN priority.
+ */
+ public void warn(Object message, Throwable t) {
+ logger.log(FQCN, Priority.WARN, message, t );
+ }
+
+
+ /**
+ * Log a message to the Log4j Logger with ERROR priority.
+ */
+ public void error(Object message) {
+ logger.log(FQCN, Priority.ERROR, message, null );
+ }
+
+
+ /**
+ * Log an error to the Log4j Logger with ERROR priority.
+ */
+ public void error(Object message, Throwable t) {
+ logger.log(FQCN, Priority.ERROR, message, t );
+ }
+
+
+ /**
+ * Log a message to the Log4j Logger with FATAL priority.
+ */
+ public void fatal(Object message) {
+ logger.log(FQCN, Priority.FATAL, message, null );
+ }
+
+
+ /**
+ * Log an error to the Log4j Logger with FATAL priority.
+ */
+ public void fatal(Object message, Throwable t) {
+ logger.log(FQCN, Priority.FATAL, message, t );
+ }
+
+
+ /**
+ * Return the native Logger instance we are using.
+ */
+ public Logger getLogger() {
+ return (this.logger);
+ }
+
+
+ /**
+ * Check whether the Log4j Logger used is enabled for DEBUG priority.
+ */
+ public boolean isDebugEnabled() {
+ return logger.isDebugEnabled();
+ }
+
+
+ /**
+ * Check whether the Log4j Logger used is enabled for ERROR priority.
+ */
+ public boolean isErrorEnabled() {
+ return logger.isEnabledFor(Priority.ERROR);
+ }
+
+
+ /**
+ * Check whether the Log4j Logger used is enabled for FATAL priority.
+ */
+ public boolean isFatalEnabled() {
+ return logger.isEnabledFor(Priority.FATAL);
+ }
+
+
+ /**
+ * Check whether the Log4j Logger used is enabled for INFO priority.
+ */
+ public boolean isInfoEnabled() {
+ return logger.isInfoEnabled();
+ }
+
+
+ /**
+ * Check whether the Log4j Logger used is enabled for TRACE priority.
+ * For Log4J, this returns the value of isDebugEnabled()
+ */
+ public boolean isTraceEnabled() {
+ return logger.isDebugEnabled();
+ }
+
+ /**
+ * Check whether the Log4j Logger used is enabled for WARN priority.
+ */
+ public boolean isWarnEnabled() {
+ return logger.isEnabledFor(Priority.WARN);
+ }
+}