If all you are looking for is variable replacement then you could look at commons-lang's StrSubstitutor class. Commons Configuration's ConfigurationInterpolator provides an example of how it can be used to resolve variables from multiple StrLookup sources, including SLF4J's MDCLookup. Ralph On Dec 30, 2010, at 1:18 PM, Oliver Geishuettner wrote:

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 --------

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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

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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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