Source Code Cross Referenced for LoggingBase.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » log » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.log 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.midp.log;
028:
029:        import com.sun.midp.configurator.Constants;
030:
031:        /**
032:         * The purpose of the logging service is to provide a standard means
033:         * to report runtime information from within Java or native code.
034:         * The porting process is eased by having to modify one logging
035:         * service implementation in place of handling the ad hoc use of
036:         * <code>println()</code>, <code>printf()</code>, <code>putc()</code>,
037:         * and other functions currently used.
038:         *
039:         * An assert mechanism for Java code, implemented using the logging
040:         * service is also provided here for convenience.
041:         *
042:         * This class consists of the Java interface to the functionality
043:         * of the logging service.
044:         */
045:        public class LoggingBase {
046:
047:            /**
048:             * A default reporting severity level. This level is the lowest
049:             * standard message reporting severity. It represents general
050:             * reporting information and is typically not associated with any
051:             * significant condition.
052:             */
053:            public static final int INFORMATION = Constants.LOG_INFORMATION;
054:
055:            /**
056:             * A reporting severity level. This level represents a warning
057:             * severity, indicating an unexpected condition which is typically
058:             * fully recoverable. Some action may be appropriate to correct
059:             * the condition.
060:             */
061:            public static final int WARNING = Constants.LOG_WARNING;
062:
063:            /**
064:             * A reporting severity level. This level represents an error
065:             * severity, indicating an unexpected condition which is typically
066:             * at least partially recoverable. Some action is expected to correct
067:             * the condition.
068:             */
069:            public static final int ERROR = Constants.LOG_ERROR;
070:
071:            /**
072:             * A reporting severity level. This level represents the most
073:             * severe error occurrence, indicating an unexpected condition which
074:             * is typically not recoverable or catastrophic to the system in some
075:             * way. Some action is required to correct the condition.
076:             */
077:            public static final int CRITICAL = Constants.LOG_CRITICAL;
078:
079:            /**
080:             * A reporting severity level that should be used to disable all
081:             * reporting output and allow all bytecodes relating to the
082:             * report() method reporting to be compiled out of the build.
083:             */
084:            public static final int DISABLED = Constants.LOG_DISABLED;
085:
086:            /**
087:             * Current reporting severity level. When used as an argument to
088:             * setReportLevel(), indicates that the current log level should
089:             * not be changed.
090:             */
091:            public static final int CURRENT = Constants.LOG_CURRENT;
092:
093:            /**
094:             * Report a message to the Logging service. The message string should
095:             * include enough description that someone reading the message will
096:             * have enough context to diagnose and solve any problems if necessary.
097:             * The severity level should be one of:
098:             * <ul>
099:             *  <li>INFORMATION</li>
100:             *  <li>WARNING</li>
101:             *  <li>ERROR</li>
102:             *  <li>CRITICAL</li>
103:             * </ul>
104:             * and should properly reflect the severity of the message. The channel
105:             * identifier should be one of the pre defined channels listed in
106:             * the LogChannels.java file.
107:             * <ul>
108:             * </ul>
109:             *
110:             * A use example:
111:             * <pre><code>
112:             *     if (Logging.REPORT_LEVEL &lt;= severity) {
113:             *         Logging.report(Logging.&lt;severity&gt;,
114:             *                        LogChannels.&lt;channel&gt;,
115:             *                        "[meaningful message]");
116:             *     }
117:             * </code></pre>
118:             *
119:             * No output will occur if <code>message</code> is null.
120:             *
121:             * @param severity severity level of report
122:             * @param channelID area report relates to, from LogChannels.java
123:             * @param message message to go with the report
124:             */
125:            public static native void report(int severity, int channelID,
126:                    String message);
127:
128:            /**
129:             * Obtain a stack trace from the Logging service, and report a message
130:             * to go along with it.  The message string should
131:             * include enough description that someone reading the message will
132:             * have enough context to diagnose and solve any problems if necessary.
133:             * A use example:
134:             * <code><pre>
135:             * } catch (Throwable t) {
136:             *     if (Logging.TRACE_ENABLED) {
137:             *         Logging.trace(t, "[meaningful message]");
138:             *     }
139:             * }
140:             * </pre></code>
141:             *
142:             * This method does nothing if either <code>t</code>
143:             * or <code>message</code> is null.
144:             *
145:             * @param t throwable causing this trace call
146:             * @param message detail message for the trace log
147:             */
148:            public static void trace(Throwable t, String message) {
149:
150:                if (t != null) {
151:                    System.out.println("TRACE: <at " + t.toString() + ">, "
152:                            + message);
153:                    t.printStackTrace();
154:                }
155:            }
156:
157:            /**
158:             * Report a message to the Logging service in the event that
159:             * <code>condition</code> is false. The message string should
160:             * include enough description that someone reading the message will
161:             * have enough context to find the failed assertion.
162:             *
163:             * A use example:
164:             * <pre><code>
165:             *     if (Logging.ASSERT_ENABLED){
166:             *         Logging.assertTrue([(boolean)conditional], "useful message");
167:             *     }
168:             * </code></pre>
169:             *
170:             * This method reports nothing if <code>message</code> is null.
171:             *
172:             * @param condition asserted to be true by the caller.
173:             *                  <code>message</code> is logged if false.
174:             * @param message message to go with the report if the assert fails
175:             *                (when <code>condition</code> is false.
176:             */
177:            public static void assertTrue(boolean condition, String message) {
178:                if (!condition) {
179:                    report(Logging.ERROR, LogChannels.LC_NONE,
180:                            "ASSERT FAILED: " + message);
181:                }
182:            }
183:        }
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