1 // SECTION-START[License Header] 2 // <editor-fold defaultstate="collapsed" desc=" Generated License "> 3 /* 4 * Java Object Management and Configuration 5 * Copyright (C) Christian Schulte, 2005-206 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * o Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * o Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $JOMC: DefaultListener.java 4381 2012-03-04 19:29:29Z schulte2005 $ 32 * 33 */ 34 // </editor-fold> 35 // SECTION-END 36 package org.jomc.ri; 37 38 import java.io.BufferedReader; 39 import java.io.IOException; 40 import java.io.PrintStream; 41 import java.io.PrintWriter; 42 import java.io.StringReader; 43 import java.io.StringWriter; 44 import java.util.logging.Level; 45 import org.jomc.spi.Listener; 46 47 // SECTION-START[Documentation] 48 // <editor-fold defaultstate="collapsed" desc=" Generated Documentation "> 49 /** 50 * Default {@code Listener} implementation. 51 * 52 * <dl> 53 * <dt><b>Identifier:</b></dt><dd>org.jomc.ri.DefaultListener</dd> 54 * <dt><b>Name:</b></dt><dd>JOMC RI</dd> 55 * <dt><b>Abstract:</b></dt><dd>No</dd> 56 * <dt><b>Final:</b></dt><dd>No</dd> 57 * <dt><b>Stateless:</b></dt><dd>No</dd> 58 * </dl> 59 * 60 * @author <a href="mailto:schulte2005@users.sourceforge.net">Christian Schulte</a> 1.1 61 * @version 1.1 62 */ 63 // </editor-fold> 64 // SECTION-END 65 // SECTION-START[Annotations] 66 // <editor-fold defaultstate="collapsed" desc=" Generated Annotations "> 67 @javax.annotation.Generated( value = "org.jomc.tools.SourceFileProcessor 1.2.2", comments = "See http://jomc.sourceforge.net/jomc/1.2/jomc-tools-1.2.2" ) 68 // </editor-fold> 69 // SECTION-END 70 public class DefaultListener implements Listener 71 { 72 // SECTION-START[DefaultListener] 73 74 /** Constant holding the platforms line separator. */ 75 private static final String LINE_SEPARATOR = System.getProperty( "line.separator", "\n" ); 76 77 /** Flag indicating the listener is enabled by default. */ 78 private static volatile Boolean defaultEnabled; 79 80 /** Flag indicating the listener is enabled. */ 81 private Boolean enabled; 82 83 /** 84 * Gets a flag indicating the listener is enabled by default. 85 * <p>The default enabled flag is controlled by system property 86 * {@code org.jomc.ri.DefaultListener.defaultEnabled} holding a value indicating the listener is enabled by default. 87 * If that property is not set, the {@code true} default is returned.</p> 88 * 89 * @return {@code true}, if the listener is enabled by default; {@code false}, if the listener is disabled by 90 * default. 91 * 92 * @see #setDefaultEnabled(java.lang.Boolean) 93 */ 94 public static boolean isDefaultEnabled() 95 { 96 if ( defaultEnabled == null ) 97 { 98 defaultEnabled = Boolean.valueOf( System.getProperty( 99 "org.jomc.ri.DefaultListener.defaultEnabled", Boolean.toString( true ) ) ); 100 101 } 102 103 return defaultEnabled; 104 } 105 106 /** 107 * Sets the flag indicating the listener is enabled by default. 108 * 109 * @param value The new value of the flag indicating the listener is enabled by default or {@code null}. 110 * 111 * @see #isDefaultEnabled() 112 */ 113 public static void setDefaultEnabled( final Boolean value ) 114 { 115 defaultEnabled = value; 116 } 117 118 /** 119 * Gets a flag indicating the listener is enabled. 120 * 121 * @return {@code true}, if the listener is enabled; {@code false}, if the listener is disabled. 122 * 123 * @see #isDefaultEnabled() 124 * @see #setEnabled(java.lang.Boolean) 125 */ 126 public final boolean isEnabled() 127 { 128 if ( this.enabled == null ) 129 { 130 this.enabled = isDefaultEnabled(); 131 } 132 133 return this.enabled; 134 } 135 136 /** 137 * Sets the flag indicating the listener is enabled. 138 * 139 * @param value The new value of the flag indicating the listener is enabled or {@code null}. 140 * 141 * @see #isEnabled() 142 */ 143 public final void setEnabled( final Boolean value ) 144 { 145 this.enabled = value; 146 } 147 148 /** 149 * Gets called on logging. 150 * <p>This method prints messages to the "standard" system streams. Messages with a level greater than 151 * {@code WARNING} are printed to the system error stream. All other messages are printed to the system output 152 * stream.</p> 153 * 154 * @param level The level of the event. 155 * @param message The message of the event or {@code null}. 156 * @param throwable The throwable of the event or {@code null}. 157 * 158 * @throws NullPointerException if {@code level} is {@code null}. 159 * 160 * @see #isEnabled() 161 */ 162 public void onLog( final Level level, final String message, final Throwable throwable ) 163 { 164 if ( level == null ) 165 { 166 throw new NullPointerException( "level" ); 167 } 168 169 if ( this.isEnabled() ) 170 { 171 // JDK: As of JDK 6, "System.console().writer()". 172 final PrintStream out = level.intValue() > Level.WARNING.intValue() ? System.err : System.out; 173 174 try 175 { 176 if ( message != null ) 177 { 178 out.print( this.splitLines( level, message ) ); 179 out.flush(); 180 } 181 182 if ( throwable != null ) 183 { 184 final StringWriter stringWriter = new StringWriter(); 185 final PrintWriter printWriter = new PrintWriter( stringWriter ); 186 throwable.printStackTrace( printWriter ); 187 printWriter.close(); 188 out.print( this.splitLines( level, stringWriter.toString() ) ); 189 out.flush(); 190 } 191 } 192 catch ( final IOException e ) 193 { 194 e.printStackTrace(); 195 } 196 } 197 } 198 199 private StringBuilder splitLines( final Level level, final String message ) throws IOException 200 { 201 BufferedReader reader = null; 202 boolean suppressExceptionOnClose = true; 203 204 try 205 { 206 final String linePrefix = "[" + level.getLocalizedName() + "] "; 207 final StringBuilder b = new StringBuilder( message.length() ); 208 reader = new BufferedReader( new StringReader( message ) ); 209 210 String line; 211 while ( ( line = reader.readLine() ) != null ) 212 { 213 b.append( linePrefix ).append( line ).append( LINE_SEPARATOR ); 214 } 215 216 suppressExceptionOnClose = false; 217 return b; 218 } 219 finally 220 { 221 try 222 { 223 if ( reader != null ) 224 { 225 reader.close(); 226 } 227 } 228 catch ( final IOException e ) 229 { 230 if ( !suppressExceptionOnClose ) 231 { 232 throw e; 233 } 234 } 235 } 236 } 237 238 // SECTION-END 239 // SECTION-START[Constructors] 240 // <editor-fold defaultstate="collapsed" desc=" Generated Constructors "> 241 /** Creates a new {@code DefaultListener} instance. */ 242 @javax.annotation.Generated( value = "org.jomc.tools.SourceFileProcessor 1.2.2", comments = "See http://jomc.sourceforge.net/jomc/1.2/jomc-tools-1.2.2" ) 243 public DefaultListener() 244 { 245 // SECTION-START[Default Constructor] 246 super(); 247 // SECTION-END 248 } 249 // </editor-fold> 250 // SECTION-END 251 // SECTION-START[Dependencies] 252 // SECTION-END 253 // SECTION-START[Properties] 254 // SECTION-END 255 // SECTION-START[Messages] 256 // SECTION-END 257 }