jakarta.faces.component.UISelectOne Maven / Gradle / Ivy
Show all versions of jakarta.faces Show documentation
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.component;
import jakarta.faces.application.FacesMessage;
import jakarta.faces.component.visit.VisitContext;
import jakarta.faces.component.visit.VisitResult;
import jakarta.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 "jakarta.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 = "jakarta.faces.SelectOne";
/**
*
* The standard component family for this component.
*
*/
public static final String COMPONENT_FAMILY = "jakarta.faces.SelectOne";
/**
*
* The message identifier of the {@link jakarta.faces.application.FacesMessage} to be created if a value not matching
* the available options is specified.
*/
public static final String INVALID_MESSAGE_ID = "jakarta.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("jakarta.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), (visitContext, 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);
}
}
}