@Override
protected void checkState() {
super.checkState();
VCS_INSTALL_STATUS vcsStatus = VCSSettings.checkInstallationPath(subversionPathEditor.getStringValue());
Boolean subversionSupport = subversionSupportBooleanFieldEditor.getBooleanValue();
if (subversionSupport && vcsStatus == VCS_INSTALL_STATUS.NO_FILE) {
    setErrorMessage("No file");
    setValid(false);
} else if (subversionSupport && vcsStatus == VCS_INSTALL_STATUS.NO_PATH) {
    setErrorMessage("No path");
    setValid(false);
} else if (subversionSupport && vcsStatus == VCS_INSTALL_STATUS.NOT_EXECUTABLE) {
    setErrorMessage("Not executable");
    setValid(false);
} else if (subversionSupport &&vcsStatus == VCS_INSTALL_STATUS.OK) {
    setErrorMessage(null);
    setValid(true);
}
}