Source Code Cross Referenced for StandardLog.java in  » Science » javolution-5.2 » javolution » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » javolution 5.2 » javolution.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
003:         * Copyright (C) 2006 - Javolution (http://javolution.org/)
004:         * All rights reserved.
005:         * 
006:         * Permission to use, copy, modify, and distribute this software is
007:         * freely granted, provided that this notice is preserved.
008:         */
009:        package javolution.util;
010:
011:        import javolution.Javolution;
012:        import javolution.context.LogContext;
013:        import j2me.lang.CharSequence;
014:        import j2me.util.logging.Level;
015:        import j2me.util.logging.Logger;
016:        import j2me.util.logging.LogRecord;
017:
018:        /**
019:         * <p> This class represents a specialized logging context forwarding events 
020:         *     to a standard logger (<code>java.util.logging.Logger</code>).</p>
021:         *
022:         * <p> This class leverages the capabilities of the standard logging facility 
023:         *     and extends it to support specialized {@link LogContext logging} on a 
024:         *     thread or object basis. For example:[code]
025:         *     StandardLog remoteLog = new StandardLog(Logger.getLogger("remote"));
026:         *     StandardLog.enter(remoteLog); 
027:         *     try {
028:         *         StandardLog.fine("Current thread uses a remote logger");
029:         *         ...       
030:         *     } finally {
031:         *         StandardLog.exit(remoteLog); // Reverts to previous logging context.
032:         *     }[/code]</p>
033:         *     
034:         *     
035:         * @author  <a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a>
036:         * @version 5.1, August 1, 2007
037:         */
038:        public class StandardLog extends LogContext {
039:
040:            /**
041:             * The logger associated to this logging context.
042:             */
043:            private Logger _logger;
044:
045:            /**
046:             * Creates a logging context forwarding events to the root logger 
047:             * (<code>Logger.getLogger("")</code>).
048:             */
049:            public StandardLog() {
050:                this (Logger.getLogger(""));
051:            }
052:
053:            /**
054:             * Creates a standard log context forwarding events to the specified 
055:             * logger.
056:             * 
057:             * @param logger the logger to which log events are forwarded to.
058:             */
059:            public StandardLog(Logger logger) {
060:                _logger = logger;
061:            }
062:
063:            /**
064:             * Returns the logger to which this context forwards the events to.
065:             * 
066:             * @return the logger for this standard logging context.
067:             */
068:            public final Logger getLogger() {
069:                return _logger;
070:            }
071:
072:            /**
073:             * Checks if a message of the given level would actually be logged
074:             * by this logger.
075:             *
076:             * @param level the message logging level
077:             * @return <code>true</code> if a message of specified level would actually
078:             *        be logged;<code>false</code> otherwise.
079:             */
080:            public static boolean isLoggable(Level level) {
081:                LogContext log = (LogContext) LogContext.getCurrent();
082:                if (log instanceof  StandardLog) {
083:                    return ((StandardLog) log)._logger.isLoggable(level);
084:                } else if (level.intValue() >= Level.WARNING.intValue()) {
085:                    return log.isWarningLogged();
086:                } else if (level.intValue() >= Level.INFO.intValue()) {
087:                    return log.isInfoLogged();
088:                } else {
089:                    return false;
090:                }
091:            }
092:
093:            /**
094:             * Log a specific LogRecord. If the current logging context is not a 
095:             * {@link StandardLog}, an {@link LogContext#logError error}, 
096:             * {@link LogContext#logWarning warning} or
097:             * {@link LogContext#logInfo info} is possibly logged.
098:             *
099:             * @param record the LogRecord to be published.
100:             */
101:            public static void log(LogRecord record) {
102:                LogContext log = (LogContext) LogContext.getCurrent();
103:                if (log instanceof  StandardLog) {
104:                    ((StandardLog) log)._logger.log(record);
105:                } else {
106:                    Throwable error = record.getThrown();
107:                    if (error != null) {
108:                        if (log.isErrorLogged()) {
109:                            log.logError(error, Javolution.j2meToCharSeq(record
110:                                    .getMessage()));
111:                        }
112:                    } else if (record.getLevel().intValue() > Level.WARNING
113:                            .intValue()) {
114:                        if (log.isWarningLogged()) {
115:                            log.logWarning(Javolution.j2meToCharSeq(record
116:                                    .getMessage()));
117:                        }
118:                    } else if (record.getLevel().intValue() > Level.INFO
119:                            .intValue()) {
120:                        if (log.isInfoLogged()) {
121:                            log.logInfo(Javolution.j2meToCharSeq(record
122:                                    .getMessage()));
123:                        }
124:                    }
125:                }
126:            }
127:
128:            /**
129:             * Logs a {@link Level#SEVERE SEVERE} message. If the current logging 
130:             * context is not a {@link StandardLog} a {@link LogContext#warning 
131:             * warning} message is logged.
132:             * 
133:             * @param msg the severe message.
134:             */
135:            public static void severe(String msg) {
136:                LogContext log = (LogContext) LogContext.getCurrent();
137:                if (log instanceof  StandardLog) {
138:                    ((StandardLog) log)._logger.severe(msg);
139:                } else if (log.isWarningLogged()) {
140:                    log.logWarning(Javolution.j2meToCharSeq(msg));
141:                }
142:            }
143:
144:            /**
145:             * Logs a {@link Level#CONFIG CONFIG} message. If the current logging 
146:             * context is not a {@link StandardLog} no message is logged.
147:             * 
148:             * @param msg the config message.
149:             */
150:            public static void config(String msg) {
151:                LogContext log = (LogContext) LogContext.getCurrent();
152:                if (log instanceof  StandardLog) {
153:                    ((StandardLog) log)._logger.config(msg);
154:                }
155:            }
156:
157:            /**
158:             * Logs a {@link Level#FINE FINE} message. If the current logging 
159:             * context is not a {@link StandardLog} no message is logged.
160:             * 
161:             * @param msg the fine message.
162:             */
163:            public static void fine(String msg) {
164:                LogContext log = (LogContext) LogContext.getCurrent();
165:                if (log instanceof  StandardLog) {
166:                    ((StandardLog) log)._logger.fine(msg);
167:                }
168:            }
169:
170:            /**
171:             * Logs a {@link Level#FINER FINER} message. If the current logging 
172:             * context is not a {@link StandardLog} no message is logged.
173:             * 
174:             * @param msg the finer message.
175:             */
176:            public static void finer(String msg) {
177:                LogContext log = (LogContext) LogContext.getCurrent();
178:                if (log instanceof  StandardLog) {
179:                    ((StandardLog) log)._logger.finer(msg);
180:                }
181:            }
182:
183:            /**
184:             * Logs a {@link Level#FINEST FINEST} message. If the current logging 
185:             * context is not a {@link StandardLog} no message is logged.
186:             * 
187:             * @param msg the finest message.
188:             */
189:            public static void finest(String msg) {
190:                LogContext log = (LogContext) LogContext.getCurrent();
191:                if (log instanceof  StandardLog) {
192:                    ((StandardLog) log)._logger.finest(msg);
193:                }
194:            }
195:
196:            /**
197:             * Logs throwing an exception. If the current logging context is not a 
198:             * {@link StandardLog} an {@link LogContext#logError error} is logged.
199:             * 
200:             * @param sourceClass name of class that issued the logging request.
201:             * @param sourceMethod name of the method.
202:             * @param thrown the error that is being thrown.
203:             */
204:            public static void throwing(String sourceClass,
205:                    String sourceMethod, Throwable thrown) {
206:                LogContext log = (LogContext) LogContext.getCurrent();
207:                if (log instanceof  StandardLog) {
208:                    ((StandardLog) log)._logger.throwing(sourceClass,
209:                            sourceMethod, thrown);
210:                } else if (log.isErrorLogged()) {
211:                    log.logError(thrown, (CharSequence) null);
212:                }
213:            }
214:
215:            /**
216:             * Log a method entry. If the current logging context is not a 
217:             * {@link StandardLog} no entry is logged.
218:             * 
219:             * @param sourceClass name of class that issued the logging request.
220:             * @param sourceMethod name of method that is being entered.
221:             */
222:            public static void entering(String sourceClass, String sourceMethod) {
223:                LogContext log = (LogContext) LogContext.getCurrent();
224:                if (log instanceof  StandardLog) {
225:                    ((StandardLog) log)._logger.entering(sourceClass,
226:                            sourceMethod);
227:                }
228:            }
229:
230:            /**
231:             * Log a method return. If the current logging context is not a 
232:             * {@link StandardLog} no return is logged.
233:             * 
234:             * @param sourceClass name of class that issued the logging request.
235:             * @param sourceMethod name of method that is being returned.
236:             */
237:            public static void exiting(String sourceClass, String sourceMethod) {
238:                LogContext log = (LogContext) LogContext.getCurrent();
239:                if (log instanceof  StandardLog) {
240:                    ((StandardLog) log)._logger.exiting(sourceClass,
241:                            sourceMethod);
242:                }
243:            }
244:
245:            // Implements LogContext abstract method.
246:            public boolean isInfoLogged() {
247:                return _logger.isLoggable(Level.INFO);
248:            }
249:
250:            // Implements LogContext abstract method.
251:            public boolean isWarningLogged() {
252:                return _logger.isLoggable(Level.WARNING);
253:            }
254:
255:            // Implements LogContext abstract method.
256:            public boolean isErrorLogged() {
257:                return _logger.isLoggable(Level.SEVERE);
258:            }
259:
260:            // Implements LogContext abstract method.
261:            public void logInfo(CharSequence message) {
262:                _logger.info(message.toString());
263:            }
264:
265:            // Implements LogContext abstract method.
266:            public void logWarning(CharSequence message) {
267:                _logger.warning(message.toString());
268:            }
269:
270:            // Implements LogContext abstract method.
271:            public void logError(Throwable error, CharSequence message) {
272:                String description = (message != null) ? message.toString()
273:                        : "";
274:                if (error != null) {
275:                    _logger.log(Level.SEVERE, description, error);
276:                } else {
277:                    _logger.log(Level.SEVERE, description);
278:                }
279:            }
280:
281:        }
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