Mercurial > hg > blitz_stable

annotate src/com/go/trove/log/Syslog.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /* ====================================================================
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2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
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3 * ====================================================================
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4 * The Tea Software License, Version 1.1
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5 *
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6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 *
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 *
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in
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17 * the documentation and/or other materials provided with the
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18 * distribution.
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19 *
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20 * 3. The end-user documentation included with the redistribution,
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21 * if any, must include the following acknowledgment:
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22 * "This product includes software developed by the
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23 * Walt Disney Internet Group (http://opensource.go.com/)."
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24 * Alternately, this acknowledgment may appear in the software itself,
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25 * if and wherever such third-party acknowledgments normally appear.
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26 *
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27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
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28 * not be used to endorse or promote products derived from this
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29 * software without prior written permission. For written
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30 * permission, please contact opensource@dig.com.
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31 *
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32 * 5. Products derived from this software may not be called "Tea",
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33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
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34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
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35 * written permission of the Walt Disney Internet Group.
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36 *
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37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
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41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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48 * ====================================================================
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49 *
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50 * For more information about Tea, please see http://opensource.go.com/.
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51 */
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52
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53 package com.go.trove.log;
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54
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55 import java.io.*;
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56
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57 /******************************************************************************
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58 * Contains references to a static Log instance that can be used for general
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59 * system-wide logging. By default, log messages are written to System.out
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60 * or System.err. When "installed", all output provided to System.out
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61 * and System.err is redirected into the system log.
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62 *
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63 * @author Brian S O'Neill
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64 * @version
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65 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
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66 * @see Log
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67 */
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68 public class Syslog {
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69 private static final Log cLog;
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70 private static final LogListener cSystemLogEventPrinter;
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71
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72 private static LogEventParsingOutputStream cSystemOut;
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73 private static LogEventParsingOutputStream cSystemErr;
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74
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75 private static PrintStream cOriginalOut;
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76 private static PrintStream cOriginalErr;
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77 private static boolean cInstalled;
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78
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79 static {
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80 cLog = new Log(null, null);
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81 cLog.setDescription("System Log");
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82
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83 cSystemLogEventPrinter = new LogListener() {
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84 public void logMessage(LogEvent e) {
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85 PrintStream ps = getPrintStream(e);
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86 String message = e.getMessage();
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87 if (message == null) {
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88 ps.println();
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89 }
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90 else {
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91 ps.println(message);
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92 }
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93 }
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94
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95 public void logException(LogEvent e) {
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96 Throwable t = e.getException();
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97 if (t == null) {
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98 logMessage(e);
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99 }
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100 else {
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101 t.printStackTrace(getPrintStream(e));
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102 }
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103 }
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104
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105 private PrintStream getPrintStream(LogEvent e) {
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106 synchronized (log()) {
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107 switch (e.getType()) {
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108 case LogEvent.DEBUG_TYPE:
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109 case LogEvent.INFO_TYPE:
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110 return (cInstalled) ? cOriginalOut : System.out;
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111 }
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112
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113 return (cInstalled) ? cOriginalErr : System.err;
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114 }
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115 }
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116 };
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117
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118 log().addLogListener(cSystemLogEventPrinter);
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119 }
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120
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121 /**
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122 * Returns the system Log instance that, by default, only has one
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123 * LogListener. It prints debug and info LogEvent messages to System.out
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124 * and other LogEvent messages to System.err.
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125 *
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126 * @see #getSystemLogEventPrinter()
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127 */
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128 public static Log log() {
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129 return cLog;
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130 }
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131
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132 /**
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133 * Returns a simple LogListener that prints debug and info LogEvent
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134 * messages to System.out and other LogEvent messages to System.err.
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135 * Remove this listener to disable printing to System.out and System.err.
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136 */
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137 public static LogListener getSystemLogEventPrinter() {
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138 return cSystemLogEventPrinter;
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139 }
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140
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141 /**
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142 * When installed, System.out and System.err are redirected to Syslog.log.
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143 * System.out produces info events, and System.err produces error events.
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144 */
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145 public static void install() {
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146 synchronized (log()) {
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147 if (!cInstalled) {
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148 cInstalled = true;
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149 cOriginalOut = System.out;
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150 cOriginalErr = System.err;
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151
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152 cSystemOut = new LogEventParsingOutputStream
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153 (log(), LogEvent.INFO_TYPE)
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154 {
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155 public boolean isEnabled() {
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156 return log().isInfoEnabled();
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157 }
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158 };
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159 cSystemOut.addLogListener(log());
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160 System.setOut(new PrintStream(cSystemOut, true));
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161
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162 cSystemErr = new LogEventParsingOutputStream
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163 (log(), LogEvent.ERROR_TYPE)
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164 {
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165 public boolean isEnabled() {
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166 return log().isErrorEnabled();
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167 }
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168 };
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169 cSystemErr.addLogListener(log());
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170 System.setErr(new PrintStream(cSystemErr, true));
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171 }
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172 }
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173 }
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174
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175 /**
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176 * Uninstalls by restoring System.out and System.err.
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177 */
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178 public static void uninstall() {
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179 synchronized (log()) {
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180 if (cInstalled) {
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181 cInstalled = false;
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182 System.setOut(cOriginalOut);
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183 System.setErr(cOriginalErr);
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184 cOriginalOut = null;
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185 cOriginalErr = null;
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186 cSystemOut = null;
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187 cSystemErr = null;
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188 }
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189 }
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190 }
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191
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192 /**
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193 * Shortcut to {@link Log#debug(String) Syslog.log().debug(String)}.
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194 */
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195 public static void debug(String s) {
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196 log().debug(s);
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197 }
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198
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199 /**
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200 * Shortcut to {@link Log#debug(Throwable) Syslog.log().debug(Throwable)}.
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201 */
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202 public static void debug(Throwable t) {
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203 log().debug(t);
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204 }
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205
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206 /**
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207 * Shortcut to {@link Log#info(String) Syslog.log().info(String)}.
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208 */
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209 public static void info(String s) {
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210 log().info(s);
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211 }
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212
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213 /**
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214 * Shortcut to {@link Log#info(Throwable) Syslog.log().info(Throwable)}.
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215 */
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216 public static void info(Throwable t) {
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217 log().info(t);
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218 }
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219
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220 /**
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221 * Shortcut to {@link Log#warn(String) Syslog.log().warn(String)}.
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222 */
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223 public static void warn(String s) {
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224 log().warn(s);
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225 }
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226
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227 /**
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228 * Shortcut to {@link Log#warn(Throwable) Syslog.log().warn(Throwable)}.
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229 */
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230 public static void warn(Throwable t) {
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231 log().warn(t);
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232 }
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233
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234 /**
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235 * Shortcut to {@link Log#error(String) Syslog.log().error(String)}.
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236 */
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237 public static void error(String s) {
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238 log().error(s);
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239 }
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240
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241 /**
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242 * Shortcut to {@link Log#error(Throwable) Syslog.log().error(Throwable)}.
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243 */
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244 public static void error(Throwable t) {
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245 log().error(t);
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246 }
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247
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248 private Syslog() {
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249 }
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250 }