public List<A> findAllAttributesByQualifier(String qualifier) {
        if (StringUtil.isBlank(qualifier) || !attributesPerQualifier.containsKey(qualifier)) return Collections.emptyList();
        return Collections.unmodifiableList(attributesPerQualifier.get(qualifier));
    }
public List < A > findAllAttributesByQualifier ( String qualifier ) { if ( StringUtil . isBlank ( qualifier ) || ! attributesPerQualifier . containsKey ( qualifier ) ) return Collections . emptyList ( ) ; return Collections . unmodifiableList ( attributesPerQualifier . get ( qualifier ) ) ; }
Returns a {@code List} of all attributes that share the same qualifier.<br/>
Never returns null, but may return an empty list. The returned {@code List} is immutable.

@return a {@code List} of all attributes with the specified qualifier.