Why this condition

Could someone explain what these conditions are checking for? I understand it has to do with checking to see if other fields are already disabled, but I I am not completely clear on it. What is referencing the getDisabled method doing specifically?

if (!userHasRoleNeeded) {
            Xrm.Page.ui.controls.forEach(function (control, i) {
                if (control && control.getDisabled && !control.getDisabled()) {
                    control.setDisabled(true);