[logback-dev] if-then-else support in Joran.

[Ceki Gülcü]

Hello all,

I began implementing if-then-else support in Joran. If you wish to
enable part of a config file in one environment and disable it
another, now you can.

Here is an example,

<configuration>

   <appender name="FILE" class="ch.qos.logback.core.FileAppender">
     <encoder>
       <pattern>%d %-5level %logger{35} - %msg %n</pattern>
    </encoder>
   </appender>

   <root level="DEBUG">
      <appender-ref ref="FILE" />
   </root>


   <if condition='property("HOSTNAME").contains("mydevHost")'>
     <then>
       <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
         <encoder>
           <pattern>%d %-5level %logger{35} - %msg %n</pattern>
         </encoder>
       </appender>
       <root incremental="true">
         <appender-ref ref="STDOUT" />
       </root>
     </then>
   </if>

</configuration>

Thus, the ConsoleAppender will be attached to the root logger only on 
"mydevHost" but not on other hosts.

This feature is still experimental. Your feedback is welcome.

--
Ceki