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package javax.faces.component;
import javax.faces.application.FacesMessage;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
/**
* UISelectOne is a
* {@link UIComponent} that represents the user's choice of zero or one
* items from among a discrete set of available options. The user can
* modify the selected value. Optionally, the component can be
* preconfigured with a currently selected item, by storing it as the
* value property of the component.
*
* This component is generally rendered as a select box or a group of
* radio buttons.
*
* By default, the rendererType property is set to
* "javax.faces.Menu". This value can be changed by
* calling the setRendererType() method.
*/
public class UISelectOne extends UIInput {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.SelectOne";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.SelectOne";
/**
* The message identifier of the
* {@link javax.faces.application.FacesMessage} to be created if
* a value not matching the available options is specified.
*/
public static final String INVALID_MESSAGE_ID =
"javax.faces.component.UISelectOne.INVALID";
enum PropertyKeys {
/**
*
* Specifies the name of the radio button group.
*
* @since 2.3
*/
group
}
// ------------------------------------------------------------ Constructors
/**
*
Create a new {@link UISelectOne} instance with default property
* values.
*/
public UISelectOne() {
super();
setRendererType("javax.faces.Menu");
}
// -------------------------------------------------------------- Properties
@Override
public String getFamily() {
return (COMPONENT_FAMILY);
}
/**
*
* Returns the name of the radio button group.
*
* Radio button components having the same group within a UIForm parent will uncheck all others when
* being checked. If the value attribute is absent then the one from first component of the group will
* be used. If the UISelectItem child is absent then the one from first component of the group will be
* used.
*
* @return The name of the radio button group.
* @since 2.3
*/
public String getGroup() {
return (String) getStateHelper().eval(PropertyKeys.group);
}
/**
*
* Sets the name of the radio button group.
*
* @param group The name of the radio button group.
* @since 2.3
*/
public void setGroup(String group) {
getStateHelper().put(PropertyKeys.group, group);
}
// ------------------------------------------------------ Validation Methods
/**
*
If {@link #getGroup()} is set, and {@link #getSubmittedValue()} is empty, and at
* least one other component having the same group within a UIForm parent has a non-empty
* {@link #getSubmittedValue()} or returns true on {@link #isLocalValueSet()} or returns
* false on {@link #isValid()}, then skip validation for current component, else perform standard
* superclass processing by super.processValidators(context).
*/
@Override
public void processValidators(FacesContext context) {
final String group = getGroup();
if (group != null && isEmpty(getSubmittedValue())) {
final String clientId = getClientId(context);
final UIComponent groupContainer = getGroupContainer(context, this);
final boolean[] alreadySubmittedOrValidatedAsGroup = new boolean[1];
groupContainer.visitTree(VisitContext.createVisitContext(context), new VisitCallback() {
@Override
public VisitResult visit(VisitContext visitContext, UIComponent target) {
if (target instanceof UISelectOne) {
UISelectOne radio = (UISelectOne) target;
if (isOtherMemberOfSameGroup(context, group, clientId, radio) && isAlreadySubmittedOrValidated(radio)) {
alreadySubmittedOrValidatedAsGroup[0] = true;
return VisitResult.COMPLETE;
}
}
return VisitResult.ACCEPT;
}
});
if (alreadySubmittedOrValidatedAsGroup[0]) {
return;
}
}
super.processValidators(context);
}
private static UIComponent getGroupContainer(FacesContext context, UISelectOne radio) {
UIComponent namingContainer = radio.getNamingContainer();
while (namingContainer != null && !(namingContainer instanceof UIForm) && namingContainer.getParent() != null) {
namingContainer = namingContainer.getParent().getNamingContainer();
}
return namingContainer != null ? namingContainer : context.getViewRoot();
}
private static boolean isOtherMemberOfSameGroup(FacesContext context, String group, String clientId, UISelectOne radio) {
return group.equals(radio.getGroup()) && !clientId.equals(radio.getClientId(context));
}
private static boolean isAlreadySubmittedOrValidated(EditableValueHolder input) {
return !isEmpty(input.getSubmittedValue()) || input.isLocalValueSet() || !input.isValid();
}
/**
* In addition to the
* standard validation behavior inherited from {@link UIInput},
* ensure that any specified value is equal to one of the available
* options. Before comparing each option, coerce the option value
* type to the type of this component's value following the
* Expression Language coercion rules. If the specified value is
* not equal to any of the options, enqueue an error message and set
* the valid property to false.
*
* If {@link #isRequired} returns
* true, and the current value is equal to the value of
* an inner {@link UISelectItem} whose {@link
* UISelectItem#isNoSelectionOption} method returns
* true, enqueue an error message and set the
* valid property to false.
*
* @param context The {@link FacesContext} for the current request
*
* @param value The converted value to test for membership.
*
* @throws NullPointerException if context
* is null
*/
@Override
protected void validateValue(FacesContext context, Object value) {
super.validateValue(context, value);
// Skip validation if it is not necessary
if (!isValid() || (value == null)) {
return;
}
// Ensure that the value matches one of the available options
boolean found = SelectUtils.matchValue(getFacesContext(),
this,
value,
new SelectItemsIterator(context, this),
getConverter());
boolean isNoSelection = SelectUtils.valueIsNoSelectionOption(getFacesContext(),
this,
value,
new SelectItemsIterator(context, this),
getConverter());
// Enqueue an error message if an invalid value was specified
if ((!found) ||
(isRequired() && isNoSelection)) {
FacesMessage message =
MessageFactory.getMessage(context, INVALID_MESSAGE_ID,
MessageFactory.getLabel(context, this));
context.addMessage(getClientId(context), message);
setValid(false);
}
}
}