javax.faces.component.UIForm Maven / Gradle / Ivy
/*
* $Id: UIForm.java,v 1.52.4.2 2008/02/22 01:46:40 rlubke Exp $
*/
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package javax.faces.component;
import java.util.Iterator;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;
/**
* UIForm is a {@link UIComponent} that represents an
* input form to be presented to the user, and whose child components represent
* (among other things) the input fields to be included when the form is
* submitted.
*
* By default, the rendererType property must be set to
* "javax.faces.Form". This value can be changed by calling the
* setRendererType() method.
*/
public class UIForm extends UIComponentBase implements NamingContainer {
// ------------------------------------------------------ Manifest Constants
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.Form";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.Form";
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UIForm} instance with default property
* values.
*/
public UIForm() {
super();
setRendererType("javax.faces.Form");
}
// ------------------------------------------------------ Instance Variables
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
/**
* The form submitted flag for this {@link UIForm}.
*/
private boolean submitted = false;
/**
* Returns the current value of the submitted
* property. The default value is false. See {@link
* #setSubmitted} for details.
*
*/
public boolean isSubmitted() {
return (this.submitted);
}
/**
* If this UIForm instance (as
* opposed to other forms in the page) is experiencing a submit
* during this request processing lifecycle, this method must be
* called, with true as the argument, during the {@link
* UIComponent#decode} for this UIForm instance. If
* this UIForm instance is
* not experiencing a submit, this method must be
* called, with false as the argument, during the
* {@link UIComponent#decode} for this UIForm
* instance.
*
* The value of a UIForm's submitted property must
* not be saved as part of its state.
*/
public void setSubmitted(boolean submitted) {
this.submitted = submitted;
}
/**
* The prependId flag.
*/
private Boolean prependId;
public boolean isPrependId() {
if (this.prependId != null) {
return (this.prependId);
}
ValueExpression ve = getValueExpression("prependId");
if (ve != null) {
try {
return (Boolean.TRUE.equals(ve.getValue(getFacesContext().getELContext())));
}
catch (ELException e) {
throw new FacesException(e);
}
} else {
return (true);
}
}
public void setPrependId(boolean prependId) {
this.prependId = prependId;
}
// ----------------------------------------------------- UIComponent Methods
/**
* Override {@link UIComponent#processDecodes} to ensure that the
* form is decoded before its children. This is
* necessary to allow the submitted property to be
* correctly set.
*
* @throws NullPointerException {@inheritDoc}
*/
public void processDecodes(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
// Process this component itself
decode(context);
// if we're not the submitted form, don't process children.
if (!isSubmitted()) {
return;
}
// Process all facets and children of this component
Iterator kids = getFacetsAndChildren();
while (kids.hasNext()) {
UIComponent kid = (UIComponent) kids.next();
kid.processDecodes(context);
}
}
/**
* Override {@link UIComponent#processValidators} to ensure that
* the children of this UIForm instance are only
* processed if {@link #isSubmitted} returns true.
*
* @throws NullPointerException {@inheritDoc}
*/
public void processValidators(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!isSubmitted()) {
return;
}
// Process all the facets and children of this component
Iterator kids = getFacetsAndChildren();
while (kids.hasNext()) {
UIComponent kid = (UIComponent) kids.next();
kid.processValidators(context);
}
}
/**
* Override {@link UIComponent#processUpdates} to ensure that the
* children of this UIForm instance are only processed
* if {@link #isSubmitted} returns true.
*
* @throws NullPointerException {@inheritDoc}
*/
public void processUpdates(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!isSubmitted()) {
return;
}
// Process all facets and children of this component
Iterator kids = getFacetsAndChildren();
while (kids.hasNext()) {
UIComponent kid = (UIComponent) kids.next();
kid.processUpdates(context);
}
}
/**
* Override the {@link UIComponent#getContainerClientId} to allow
* users to disable this form from prepending its clientId to
* its descendent's clientIds depending on the value of
* this form's {@link #isPrependId} property.
*/
public String getContainerClientId(FacesContext context) {
if (this.isPrependId()) {
return super.getContainerClientId(context);
} else {
UIComponent parent = this.getParent();
while (parent != null) {
if (parent instanceof NamingContainer) {
return parent.getContainerClientId(context);
}
parent = parent.getParent();
}
}
return null;
}
private Object[] values;
@Override
public Object saveState(FacesContext context) {
if (values == null) {
values = new Object[2];
}
values[0] = super.saveState(context);
values[1] = prependId;
return values;
}
@Override
public void restoreState(FacesContext context, Object state) {
values = (Object[]) state;
super.restoreState(context, values[0]);
prependId = (Boolean) values[1];
}
}