@Override
    public String transform(final String formUserId) {
        return formUserId.trim();
    }
A transformer that does no transformations and returns the principal name as it was provided.

@author Misagh Moayyed
@since 5.2.0
core/cas-server-core-util-api/src/main/java/org/apereo/cas/util/transforms/NoOpPrincipalNameTransformer.java