Re: [logback-user] Joran and variable substitution

30 Dec 2010

      Thanks for the hint, this lead me in the right direction !
I found out that a simple context.subst in e.g. the begin part of the action is sufficient. To make things easier for me I created a small helper class: 

public final class VariableHelper {
 final static Logger log = LoggerFactory.getLogger(VariableHelper.class);

 private InterpretationContext context = null;
 private Attributes attrs = null;

 private VariableHelper( InterpretationContext context, Attributes attrs ) {
  this.context = context;
  this.attrs = attrs;  
 }

 public static String replace(final InterpretationContext ic,
   final String str) {
  String ret = null;
  log.debug("before subst '{}'", str);
  ret = ic.subst(str);
  log.debug("after subst: '{}'", ret);

  return ret;
 }

 public static String replace(final InterpretationContext ic,
   final Attributes attrs, final String attrName) {
  return replace(ic, attrs.getValue(attrName));
 }

 public String replace( String attrName ) {
  return replace( context, attrs, attrName );
 }

 public static VariableHelper createInstance( final InterpretationContext context, final Attributes attrs ) {
  return new VariableHelper( context, attrs );
 }
}

This class can be used like this:

public class FooBarAction extends Action {
 public void begin(InterpretationContext context, String arg1,
   Attributes attributes) throws ActionException {
  VariableHelper vh = VariableHelper.createInstance(context, attributes);

  String foo = vh.replace("foo");
  String bar = vh.replace("sbar");
...

This is a replacement for:

String foo = attributes.getValue( "foo" );
foo = context.subst("foo" );

Perhaps this is of help for somebody.
-------- Original-Nachricht --------
...
Datum: Thu, 30 Dec 2010 13:35:37 +0100
Von: Ceki Gulcu <ceki@qos.ch>
An: logback users list <logback-user@qos.ch>
Betreff: Re: [logback-user] Joran and variable substitution
...
Hi Marge,
Variable substitution is done by Joran actions on an individual
basis. Search for usages of the subst() method of the
InterpretationContext class.
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Re: [logback-user] Joran and variable substitution

Oliver Geishuettner