fallbackMatching.put( "none/ayb", "none/ayf" );
fallbackMatching.put( "none/ayd", "none/ayd" );
fallbackMatching.put( "none/bgk", "unknown/bgk" );
// do the conversion
Mappings mappings = new MappingsReader().read( new FileReader( inMappingsFile ) );
convertMappings( sourceJar, destJar, mappings, fallbackMatching );
// write out the converted mappings
FileWriter writer = new FileWriter( outMappingsFile );
new MappingsWriter().write( writer, mappings );