code: public void setPermissionValues(java.util.Collection<String> permissionValues) {
          if (permissionValues == null) {
              this.permissionValues = null;
              return;
          }
  
          this.permissionValues = new java.util.ArrayList<String>(permissionValues);
      }
docs: <p>
  The permissions granted to the grantee. SEND_AS allows the grantee to send email as the owner of the mailbox (the
  grantee is not mentioned on these emails). SEND_ON_BEHALF allows the grantee to send email on behalf of the owner
  of the mailbox (the grantee is not mentioned as the physical sender of these emails). FULL_ACCESS allows the
  grantee full access to the mailbox, irrespective of other folder-level permissions set on the mailbox.
  </p>
  
  @param permissionValues
  The permissions granted to the grantee. SEND_AS allows the grantee to send email as the owner of the
  mailbox (the grantee is not mentioned on these emails). SEND_ON_BEHALF allows the grantee to send email on
  behalf of the owner of the mailbox (the grantee is not mentioned as the physical sender of these emails).
  FULL_ACCESS allows the grantee full access to the mailbox, irrespective of other folder-level permissions
  set on the mailbox.
  @see PermissionType