*/
public abstract <T> T getStorage( Stub<T> stub );
public void prepareWalker( Walker walker, ValidationStringency strictnessLevel ) {
for( Map.Entry<ArgumentSource,Object> io: inputs.entrySet() ) {
ArgumentSource targetField = io.getKey();
Object targetValue = io.getValue();
// Ghastly hack: reaches in and finishes building out the SAMFileReader.
// TODO: Generalize this, and move it to its own initialization step.
if( targetValue instanceof SAMFileReaderBuilder) {