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- /*
- * Copyright (c) 2006-2009 Chris Smith, Shane Mc Cormack, Gregory Holmes
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
- package com.dmdirc.parser.irc;
-
- import java.lang.reflect.Method;
- import java.lang.reflect.InvocationTargetException;
-
- /**
- * Logging using log4j if available.
- */
- public class Logging {
- /** Available Log Levels */
- public enum LogLevel {
- TRACE("trace", "isTraceEnabled"),
- DEBUG("debug", "isDebugEnabled"),
- INFO("info", "isInfoEnabled"),
- WARN("warn", "isWarnEnabled"),
- ERROR("error", "isErrorEnabled"),
- FATAL("fatal", "isFatalEnabled");
-
- /** Method name */
- private final String methodName;
-
- /** Check Method name */
- private final String checkMethodName;
-
- /**
- * Create a new LogLevel
- *
- * @param methodName Name of method in log4j to log to
- * @param checkMethodName Name of method in log4j to sue to check logging
- */
- private LogLevel(final String methodName, final String checkMethodName) {
- this.methodName = methodName;
- this.checkMethodName = checkMethodName;
- }
-
- /**
- * Get the Name of method in log4j to log to
- *
- * @return Name of method in log4j to log to
- */
- public String getMethodName() { return methodName; }
-
- /**
- * Get the Name of the check method in log4j
- *
- * @return Name of check method in log4j
- */
- public String getCheckMethodName() { return checkMethodName; }
- };
-
- /** Singleton Instance of Logging */
- private static Logging me;
-
- /** Is log4j available */
- private final boolean isAvailable;
-
- /** "Log" object if available */
- private Object log = null;
-
- /** Get an instance of Logging */
- public static Logging getLogging() {
- if (me == null) { me = new Logging(); }
- return me;
- }
-
- /** Create a new Logging */
- @SuppressWarnings("unchecked")
- private Logging() {
- boolean classExists = false;
- try {
- Class factory = null;
- // Check for classes
- Class.forName("org.apache.commons.logging.Log");
- factory = Class.forName("org.apache.commons.logging.LogFactory");
-
- classExists = (factory != null);
- if (classExists) {
- final Method getLog = factory.getMethod("getLog", new Class[]{Class.class});
- log = getLog.invoke(null, this.getClass());
- }
- } catch (ClassNotFoundException cnfe) {
- } catch (NoSuchMethodException nsme) {
- } catch (IllegalAccessException iae) {
- } catch (InvocationTargetException ite) {
- }
-
- isAvailable = (classExists && log != null);
- }
-
- /**
- * Check is a log level is available.
- *
- * @param level Level to check
- */
- public boolean levelEnabled(final LogLevel level) {
- if (isAvailable) {
- try {
- final Method check = log.getClass().getMethod(level.getCheckMethodName(), new Class[0]);
- return (Boolean)check.invoke(log, new Object[0]);
- } catch (NoSuchMethodException nsme) {
- } catch (IllegalAccessException iae) {
- } catch (InvocationTargetException ite) {
- }
- }
-
- return false;
- }
-
- /**
- * Log a message if log4j is available.
- *
- * @param level Level to log at
- * @param message Message to log
- */
- public void log(final LogLevel level, final String message) {
- log(level, message, null);
- }
-
- /**
- * Log a message if log4j is available.
- *
- * @param level Level to log at
- * @param message Message to log
- * @param throwable Throwable to log alongside message
- */
- public void log(final LogLevel level, final String message, final Throwable throwable) {
- if (!isAvailable) { return; }
- try {
- if (throwable == null) {
- final Method method = log.getClass().getMethod(level.getMethodName(), new Class[]{String.class});
- method.invoke(log, new Object[]{message});
- } else {
- final Method method = log.getClass().getMethod(level.getMethodName(), new Class[]{String.class, Throwable.class});
- method.invoke(log, new Object[]{message, throwable});
- }
- } catch (NoSuchMethodException nsme) {
- } catch (IllegalAccessException iae) {
- } catch (InvocationTargetException ite) {
- }
- }
- }
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