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package javax.faces.component;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
/**
* <p><strong class="changed_modified_2_0">UISelectOne</strong> 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
* <code>value</code> property of the component.</p>
*
* <p>This component is generally rendered as a select box or a group of
* radio buttons.</p>
*
* <p>By default, the <code>rendererType</code> property is set to
* "<code>javax.faces.Menu</code>". This value can be changed by
* calling the <code>setRendererType()</code> method.</p>
*/
public class UISelectOne extends UIInput {
// ------------------------------------------------------ Manifest Constants
/**
* <p>The standard component type for this component.</p>
*/
public static final String COMPONENT_TYPE = "javax.faces.SelectOne";
/**
* <p>The standard component family for this component.</p>
*/
public static final String COMPONENT_FAMILY = "javax.faces.SelectOne";
/**
* <p>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";
// ------------------------------------------------------------ Constructors
/**
* <p>Create a new {@link UISelectOne} instance with default property
* values.</p>
*/
public UISelectOne() {
super();
setRendererType("javax.faces.Menu");
}
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
// ------------------------------------------------------ Validation Methods
/**
* <p><span class="changed_modified_2_0">In</span> 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 <code>valid</code> property to <code>false</code>.</p>
*
* <p class="changed_added_2_0">If {@link #isRequired} returns
* <code>true</code>, and the current value is equal to the value of
* an inner {@link UISelectItem} whose {@link
* UISelectItem#isNoSelectionOption} method returns
* <code>true</code>, enqueue an error message and set the
* <code>valid</code> property to <code>false</code>.</p>
*
* @param context The {@link FacesContext} for the current request
*
* @param value The converted value to test for membership.
*
* @throws NullPointerException if <code>context</code>
* is <code>null</code>
*/
protected void validateValue(FacesContext context, Object value) {
// Skip validation if it is not necessary
super.validateValue(context, value);
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);
}
}
}