javax.faces.component.UISelectItems Maven / Gradle / Ivy
/*
* $Id: UISelectItems.java,v 1.31 2007/04/27 22:00:05 ofung Exp $
*/
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package javax.faces.component;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import javax.faces.model.SelectItem;
/**
* UISelectItems is a component that may be nested
* inside a {@link UISelectMany} or {@link UISelectOne} component, and
* causes the addition of one or more {@link SelectItem} instances to the
* list of available options in the parent component. The
* value of this component (set either directly, or acquired
* indirectly a {@link javax.el.ValueExpression}, can be of any
* of the following types:
*
* - Single instance of {@link SelectItem} - This instance is
* added to the set of available options for the parent tag.
* - Array of {@link SelectItem} - This set of instances is
* added to the set of available options for the parent component,
* in ascending subscript order.
* - Collection of {@link SelectItem} - This set of instances is
* added to the set of available options for the parent component,
* in the order provided by an iterator over them.
* - Map - The keys of this object (once converted to
* Strings) are assumed to be labels, and the values of this object
* (once converted to Strings)
* are assumed to be values, of {@link SelectItem} instances that will
* be constructed dynamically and added to the set of available options
* for the parent component, in the order provided by an iterator over
* the keys.
*
*/
public class UISelectItems extends UIComponentBase {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.SelectItems";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.SelectItems";
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UISelectItems} instance with default property
* values.
*/
public UISelectItems() {
super();
setRendererType(null);
}
// ------------------------------------------------------ Instance Variables
private Object value = null;
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
// -------------------------------------------------- ValueHolder Properties
/**
* Returns the value property of the
* UISelectItems.
*/
public Object getValue() {
if (this.value != null) {
return (this.value);
}
ValueExpression ve = getValueExpression("value");
if (ve != null) {
try {
return (ve.getValue(getFacesContext().getELContext()));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (null);
}
}
/**
* Sets the value property of the
* UISelectItems.
*
* @param value the new value
*/
public void setValue(Object value) {
this.value = value;
}
// ----------------------------------------------------- StateHolder Methods
private Object[] values;
public Object saveState(FacesContext context) {
if (values == null) {
values = new Object[2];
}
values[0] = super.saveState(context);
values[1] = value;
return (values);
}
public void restoreState(FacesContext context, Object state) {
values = (Object[]) state;
super.restoreState(context, values[0]);
value = values[1];
}
}