2009-09-26 12:04:48 +02:00
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package com.esotericsoftware.minlog;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.util.Date;
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/**
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* A low overhead, lightweight logging system.
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* @author Nathan Sweet <misc@n4te.com>
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*/
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public class Log {
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/** No logging at all. */
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static public final int LEVEL_NONE = 6;
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/** Critical errors. The application may no longer work correctly. */
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static public final int LEVEL_ERROR = 5;
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/** Important warnings. The application will continue to work correctly. */
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static public final int LEVEL_WARN = 4;
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2009-09-26 12:06:42 +02:00
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/** Informative messages. Typically used for deployment. */
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2009-09-26 12:04:48 +02:00
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static public final int LEVEL_INFO = 3;
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/** Debug messages. This level is useful during development. */
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static public final int LEVEL_DEBUG = 2;
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/** Trace messages. A lot of information is logged, so this level is usually only needed when debugging a problem. */
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static public final int LEVEL_TRACE = 1;
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/**
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* The level of messages that will be logged. Compiling as "final" will cause the compiler to remove all "if (Log.info) ..."
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* type statements below the set level.
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*/
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static private final int level = LEVEL_TRACE;
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/** True when the ERROR level will be logged. */
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static public final boolean ERROR = level <= LEVEL_ERROR;
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/** True when the WARN level will be logged. */
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static public final boolean WARN = level <= LEVEL_WARN;
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/** True when the INFO level will be logged. */
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static public final boolean INFO = level <= LEVEL_INFO;
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/** True when the DEBUG level will be logged. */
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static public final boolean DEBUG = level <= LEVEL_DEBUG;
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/** True when the TRACE level will be logged. */
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static public final boolean TRACE = level <= LEVEL_TRACE;
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/**
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* Sets the level to log. If a version of this class is being used that has a final log level, this has no affect.
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*/
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static public void set (int level) {
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// Log.level = level;
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// ERROR = level <= LEVEL_ERROR;
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// WARN = level <= LEVEL_WARN;
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// INFO = level <= LEVEL_INFO;
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// DEBUG = level <= LEVEL_DEBUG;
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// TRACE = level <= LEVEL_TRACE;
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}
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/**
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* Sets the logger that will write the log messages.
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*/
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static public void set (Logger logger) {
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Log.logger = logger;
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}
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static private Logger logger = new Logger();
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static public void error (String message, Throwable ex) {
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if (ERROR) logger.log(LEVEL_ERROR, null, message, ex);
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}
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static public void error (String category, String message, Throwable ex) {
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if (ERROR) logger.log(LEVEL_ERROR, category, message, ex);
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}
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static public void error (String message) {
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if (ERROR) logger.log(LEVEL_ERROR, null, message, null);
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}
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static public void error (String category, String message) {
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if (ERROR) logger.log(LEVEL_ERROR, category, message, null);
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}
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static public void warn (String message, Throwable ex) {
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if (WARN) logger.log(LEVEL_WARN, null, message, ex);
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}
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static public void warn (String category, String message, Throwable ex) {
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if (WARN) logger.log(LEVEL_WARN, category, message, ex);
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}
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static public void warn (String message) {
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if (WARN) logger.log(LEVEL_WARN, null, message, null);
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}
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static public void warn (String category, String message) {
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if (WARN) logger.log(LEVEL_WARN, category, message, null);
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}
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static public void info (String message, Throwable ex) {
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if (INFO) logger.log(LEVEL_INFO, null, message, ex);
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}
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static public void info (String category, String message, Throwable ex) {
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if (INFO) logger.log(LEVEL_INFO, category, message, ex);
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}
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static public void info (String message) {
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if (INFO) logger.log(LEVEL_INFO, null, message, null);
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}
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static public void info (String category, String message) {
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if (INFO) logger.log(LEVEL_INFO, category, message, null);
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}
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static public void debug (String message, Throwable ex) {
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if (DEBUG) logger.log(LEVEL_DEBUG, null, message, ex);
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}
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static public void debug (String category, String message, Throwable ex) {
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if (DEBUG) logger.log(LEVEL_DEBUG, category, message, ex);
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}
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static public void debug (String message) {
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if (DEBUG) logger.log(LEVEL_DEBUG, null, message, null);
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}
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static public void debug (String category, String message) {
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if (DEBUG) logger.log(LEVEL_DEBUG, category, message, null);
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}
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static public void trace (String message, Throwable ex) {
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if (TRACE) logger.log(LEVEL_TRACE, null, message, ex);
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}
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static public void trace (String category, String message, Throwable ex) {
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if (TRACE) logger.log(LEVEL_TRACE, category, message, ex);
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}
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static public void trace (String message) {
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if (TRACE) logger.log(LEVEL_TRACE, null, message, null);
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}
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static public void trace (String category, String message) {
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if (TRACE) logger.log(LEVEL_TRACE, category, message, null);
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}
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private Log () {
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}
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/**
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* Performs the actual logging. Default implementation logs to System.out. Extended and use {@link Log#logger} set to handle
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* logging differently.
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*/
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static public class Logger {
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private long firstLogTime = new Date().getTime();
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public void log (int level, String category, String message, Throwable ex) {
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StringBuilder builder = new StringBuilder(256);
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long time = new Date().getTime() - firstLogTime;
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long minutes = time / (1000 * 60);
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long seconds = time / (1000) % 60;
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if (minutes < 9) builder.append('0');
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builder.append(minutes);
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builder.append(':');
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if (seconds < 9) builder.append('0');
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builder.append(seconds);
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switch (level) {
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case LEVEL_ERROR:
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builder.append(" ERROR: ");
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break;
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case LEVEL_WARN:
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builder.append(" WARN: ");
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break;
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case LEVEL_INFO:
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builder.append(" INFO: ");
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break;
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case LEVEL_DEBUG:
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builder.append(" DEBUG: ");
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break;
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case LEVEL_TRACE:
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builder.append(" TRACE: ");
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break;
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}
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if (category != null) {
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builder.append('[');
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builder.append(category);
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builder.append("] ");
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}
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builder.append(message);
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if (ex != null) {
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StringWriter writer = new StringWriter(256);
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ex.printStackTrace(new PrintWriter(writer));
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builder.append('\n');
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builder.append(writer.toString().trim());
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}
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System.out.println(builder);
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}
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}
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static public class MyLogger extends Logger {
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public void log (int level, String category, String message, Throwable ex) {
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StringBuilder builder = new StringBuilder(256);
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builder.append(new Date());
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builder.append(' ');
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builder.append(level);
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builder.append('[');
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builder.append(category);
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builder.append("] ");
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builder.append(message);
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if (ex != null) {
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StringWriter writer = new StringWriter(256);
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ex.printStackTrace(new PrintWriter(writer));
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builder.append('\n');
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builder.append(writer.toString().trim());
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}
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System.out.println(builder);
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}
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}
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}
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