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  /*
   * $Id: UISelectOne.java,v 1.56 2007/07/27 19:59:08 rlubke Exp $
   */
  
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 package javax.faces.component;
 
 
 

UISelectOne is a 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 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
 

    

Create a new UISelectOne instance with default property values.

    public UISelectOne() {
        super();
        setRendererType("javax.faces.Menu");
    }
    // -------------------------------------------------------------- Properties
    public String getFamily() {
        return ();
    }
    // ------------------------------------------------------ Validation Methods


    

In addition to the standard validation behavior inherited from 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.

Parameters:
context The javax.faces.context.FacesContext for the current request
value The converted value to test for membership.
Throws:
java.lang.NullPointerException if context is null
    protected void validateValue(FacesContext contextObject value) {
        // Skip validation if it is not necessary
        super.validateValue(contextvalue);
        if (!isValid() || (value == null)) {
            return;
        }
        // Ensure that the value matches one of the available options
        boolean found = matchValue(valuenew SelectItemsIterator(this));
        // Enqueue an error message if an invalid value was specified
        if (!found) {
            FacesMessage message =
                MessageFactory.getMessage(context,
                     MessageFactory.getLabel(contextthis));
            context.addMessage(getClientId(context), message);
            setValid(false);
        }
    }
    // --------------------------------------------------------- Private Methods


    

Return true if the specified value matches one of the available options, performing a recursive search if if a javax.faces.model.SelectItemGroup instance is detected.

Parameters:
value UIComponent value to be tested
items Iterator over the javax.faces.model.SelectItems to be checked
    private boolean matchValue(Object valueIterator items) {
        while (items.hasNext()) {
            SelectItem item = (SelectItemitems.next();
            if (item instanceof SelectItemGroup) {
                SelectItem subitems[] =
                    ((SelectItemGroupitem).getSelectItems();
                if ((subitems != null) && (subitems.length > 0)) {
                    if (matchValue(valuenew ArrayIterator(subitems))) {
                        return (true);
                    }
                }
            } else {
                //Coerce the item value type before comparing values.
                Class type = value.getClass();
                Object newValue;
                try {
                    newValue = getFacesContext().getApplication().
                        getExpressionFactory().coerceToType(item.getValue(), type);
                } catch (ELException ele) {
                    newValue = item.getValue();
                } catch (IllegalArgumentException iae) {
                    // If coerceToType fails, per the docs it should throw
                    // an ELException, however, GF 9.0 and 9.0u1 will throw
                    // an IllegalArgumentException instead (see GF issue 1527).                    
                    newValue = item.getValue();
                }
                if (value.equals(newValue)) {
                    return (true);
                }
            }
        }
        return (false);
    }
    static class ArrayIterator implements Iterator {
        public ArrayIterator(Object items[]) {
            this. = items;
        }
        private Object items[];
        private int index = 0;
        public boolean hasNext() {
            return ( < .);
        }
        public Object next() {
            try {
                return ([++]);
            } catch (IndexOutOfBoundsException e) {
                throw new NoSuchElementException();
            }
        }
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }
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