Java tutorial
/* ********************************************************************** ** ** Copyright notice ** ** ** ** (c) 2005-2009 RSSOwl Development Team ** ** http://www.rssowl.org/ ** ** ** ** All rights reserved ** ** ** ** This program and the accompanying materials are made available under ** ** the terms of the Eclipse Public License v1.0 which accompanies this ** ** distribution, and is available at: ** ** http://www.rssowl.org/legal/epl-v10.html ** ** ** ** A copy is found in the file epl-v10.html and important notices to the ** ** license from the team is found in the textfile LICENSE.txt distributed ** ** in this package. ** ** ** ** This copyright notice MUST APPEAR in all copies of the file! ** ** ** ** Contributors: ** ** RSSOwl Development Team - initial API and implementation ** ** ** ** ********************************************************************** */ package org.rssowl.core.internal; import org.apache.commons.logging.Log; import org.eclipse.core.runtime.IStatus; import org.rssowl.core.util.CoreUtils; import org.rssowl.core.util.StringUtils; /** * Implementation of <code>Log</code> that writes error and fatal messages to * the Eclipse Log Mechanism. * * @author bpasero */ public class LogBridge implements Log { /* System Properties to Control Logging Levels */ private static final String DEBUG_PROPERTY = "rssowl.http.debug"; //$NON-NLS-1$ private static final String TRACE_PROPERTY = "rssowl.http.trace"; //$NON-NLS-1$ private static final String INFO_PROPERTY = "rssowl.http.info"; //$NON-NLS-1$ private static final String WARN_PROPERTY = "rssowl.http.warn"; //$NON-NLS-1$ private final boolean fDebug; private final boolean fTrace; private final boolean fInfo; private final boolean fWarn; private final String fNl; private enum Level { INFO, WARNING, ERROR } /** Keep for reflection */ public LogBridge() { this(null); } /** * Keep for reflection * * @param str the class using this log */ public LogBridge(String str) { fDebug = System.getProperty(DEBUG_PROPERTY) != null; fTrace = System.getProperty(TRACE_PROPERTY) != null; fInfo = System.getProperty(INFO_PROPERTY) != null; fWarn = System.getProperty(WARN_PROPERTY) != null; String nl = System.getProperty("line.separator"); //$NON-NLS-1$ if (!StringUtils.isSet(nl)) nl = "\n"; //$NON-NLS-1$ fNl = nl; } /* * @see org.apache.commons.logging.impl.NoOpLog#error(java.lang.Object, * java.lang.Throwable) */ public void error(Object message, Throwable t) { logError(message, t); } /* * @see org.apache.commons.logging.impl.NoOpLog#error(java.lang.Object) */ public void error(Object message) { logError(message, null); } /* * @see org.apache.commons.logging.impl.NoOpLog#fatal(java.lang.Object, * java.lang.Throwable) */ public void fatal(Object message, Throwable t) { logError(message, t); } /* * @see org.apache.commons.logging.impl.NoOpLog#fatal(java.lang.Object) */ public void fatal(Object message) { logError(message, null); } private void logInfo(Object message, Throwable t) { logStatus(message, t, Level.INFO); } private void logWarning(Object message, Throwable t) { logStatus(message, t, Level.WARNING); } private void logError(Object message, Throwable t) { logStatus(message, t, Level.ERROR); } private void logStatus(Object message, Throwable t, Level level) { if (message instanceof String || t instanceof Exception) { String msg = null; if (message instanceof String) msg = message.toString(); Exception e = null; if (t instanceof Exception) e = (Exception) t; if (msg == null && e != null && e.getMessage() != null) msg = e.getMessage(); /* Write Info and Warning to Log Directly */ if (level == Level.INFO || level == Level.WARNING) { if (StringUtils.isSet(msg)) { CoreUtils.appendLogMessage(msg); CoreUtils.appendLogMessage(fNl); } } /* Log Error Status for Errors */ else { Activator activator = Activator.getDefault(); if (activator != null) { IStatus status = activator.createErrorStatus(msg, e); activator.getLog().log(status); } } } } /* * @see org.apache.commons.logging.Log#debug(java.lang.Object) */ public void debug(Object message) { if (isDebugEnabled()) logInfo(message, null); } /* * @see org.apache.commons.logging.Log#debug(java.lang.Object, * java.lang.Throwable) */ public void debug(Object message, Throwable t) { if (isDebugEnabled()) logInfo(message, t); } /* * @see org.apache.commons.logging.Log#info(java.lang.Object) */ public void info(Object message) { if (isInfoEnabled()) logInfo(message, null); } /* * @see org.apache.commons.logging.Log#info(java.lang.Object, * java.lang.Throwable) */ public void info(Object message, Throwable t) { if (isInfoEnabled()) logInfo(message, t); } /* * @see org.apache.commons.logging.Log#warn(java.lang.Object) */ public void warn(Object message) { if (isWarnEnabled()) logWarning(message, null); } /* * @see org.apache.commons.logging.Log#warn(java.lang.Object, * java.lang.Throwable) */ public void warn(Object message, Throwable t) { if (isWarnEnabled()) logWarning(message, t); } /* * @see org.apache.commons.logging.Log#trace(java.lang.Object) */ public void trace(Object message) { if (isTraceEnabled()) logInfo(message, null); } /* * @see org.apache.commons.logging.Log#trace(java.lang.Object, * java.lang.Throwable) */ public void trace(Object message, Throwable t) { if (isTraceEnabled()) logInfo(message, t); } /* * @see org.apache.commons.logging.Log#isDebugEnabled() */ public boolean isDebugEnabled() { return fDebug; } /* * @see org.apache.commons.logging.Log#isErrorEnabled() */ public boolean isErrorEnabled() { return true; } /* * @see org.apache.commons.logging.Log#isFatalEnabled() */ public boolean isFatalEnabled() { return true; } /* * @see org.apache.commons.logging.Log#isInfoEnabled() */ public boolean isInfoEnabled() { return fInfo; } /* * @see org.apache.commons.logging.Log#isTraceEnabled() */ public boolean isTraceEnabled() { return fTrace; } /* * @see org.apache.commons.logging.Log#isWarnEnabled() */ public boolean isWarnEnabled() { return fWarn; } }