import org.apache.wicket.markup.html.form.validation.IFormValidator; //导入依赖的package包/类
@Override
public IFormValidator getFormValidator() {

    final CheckBox firstCheckBox = findFirstCheckBox();

    if (firstCheckBox != null && (minSelections > 0 || maxSelections > 0)) {

        return new AbstractFormValidator() {

            @Override
            public FormComponent<?>[] getDependentFormComponents() {
                return null;
            }

            @Override
            public void validate(Form<?> form) {

                if (!CheckBoxContainerPanel.this.isEnabled()) {
                    return;
                }

                int count = getSelectionCount();

                if (isVisibleInHierarchy() && count > maxSelections) {
                    firstCheckBox.error(maxSelectionsError.getObject());
                }

                if (isVisibleInHierarchy() && count < minSelections) {
                    firstCheckBox.error(minSelectionsError.getObject());
                }

            }
        };

    } else {
        return null;
    }

}
 

import org.apache.wicket.markup.html.form.validation.IFormValidator; //导入依赖的package包/类
@SuppressWarnings("serial")
private void addLdapStuff()
{
  gridBuilder.newGridPanel();
  gridBuilder.newFormHeading(getString("ldap"));
  gridBuilder.newSplitPanel(GridSize.COL50);
  final boolean posixConfigured = LdapUserDao.isPosixAccountsConfigured();
  if (posixConfigured == false) {
    return;
  }
  final List<FormComponent< ? >> dependentLdapPosixFormComponentsList = new LinkedList<FormComponent< ? >>();
  if (posixConfigured == true) {
    {
      final FieldsetPanel fs = gridBuilder.newFieldset(getString("ldap.gidNumber"), getString("ldap.posixAccount"));
      gidNumberField = new MinMaxNumberField<Integer>(fs.getTextFieldId(), new PropertyModel<Integer>(ldapGroupValues, "gidNumber"), 1,
          65535);
      WicketUtils.setSize(gidNumberField, 6);
      fs.add(gidNumberField);
      fs.addHelpIcon(gridBuilder.getString("ldap.gidNumber.tooltip"));
      dependentLdapPosixFormComponentsList.add(gidNumberField);
      if (ldapGroupValues.isPosixValuesEmpty() == true) {
        final Button createButton = newCreateButton(dependentLdapPosixFormComponentsList);
        fs.add(new SingleButtonPanel(fs.newChildId(), createButton, gridBuilder.getString("create"), SingleButtonPanel.NORMAL));
        WicketUtils.addTooltip(createButton, gridBuilder.getString("ldap.gidNumber.createDefault.tooltip"));
      }
    }
  }
  if (posixConfigured == true) {
    add(new IFormValidator() {
      @Override
      public FormComponent< ? >[] getDependentFormComponents()
      {
        return dependentLdapPosixFormComponentsList.toArray(new FormComponent[0]);
      }

      @Override
      public void validate(final Form< ? > form)
      {
        final LdapGroupValues values = new LdapGroupValues();
        values.setGidNumber(gidNumberField.getConvertedInput());
        if (StringUtils.isBlank(data.getLdapValues()) == true && values.isPosixValuesEmpty() == true) {
          // Nothing to validate: all fields are zero and posix account wasn't set for this group before.
          return;
        }
        if (values.getGidNumber() == null) {
          gidNumberField.error(getLocalizedMessage(WebConstants.I18N_KEY_FIELD_REQUIRED, getString("ldap.gidNumber")));
        } else {
          if (LdapPosixGroupsUtils.isGivenNumberFree(data, values.getGidNumber()) == false) {
            gidNumberField.error(getLocalizedMessage("ldap.gidNumber.alreadyInUse", LdapPosixGroupsUtils.getNextFreeGidNumber()));
          }
        }
      }
    });
  }
}
 

import org.apache.wicket.markup.html.form.validation.IFormValidator; //导入依赖的package包/类
/**
 * Returns the form validator used by this component, or null if the component
 * has no such validator.
 */
public IFormValidator getFormValidator();