protected boolean isPermissive(Object mappedValue) {
        if (mappedValue != null) {
            String[] values = (String[]) mappedValue;
            return Arrays.binarySearch(values, PERMISSIVE) >= 0;
        }
        return false;
    }
Returns <code>true</code> if the mappedValue contains the {@link #PERMISSIVE} qualifier.

@return <code>true</code> if this filter should be permissive
web/src/main/java/org/apache/shiro/web/filter/authc/AuthenticatingFilter.java