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This is the master POM file for Sun's Implementation of the JSF 2.1 Specification.

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package javax.faces.component;

import java.util.Collection;
import java.util.Iterator;
import javax.faces.application.Application;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
import javax.faces.event.PostValidateEvent;
import javax.faces.event.PreValidateEvent;


/**
 * 

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, UniqueIdVendor { // ------------------------------------------------------ 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"; /** * Properties that are tracked by state saving. */ enum PropertyKeys { /** *

The prependId flag.

*/ prependId, /** *

Last id vended by {@link UIForm#createUniqueId(javax.faces.context.FacesContext, String)}.

*/ lastId, submitted, } // ------------------------------------------------------------ Constructors /** *

Create a new {@link UIForm} instance with default property * values.

*/ public UIForm() { super(); setRendererType("javax.faces.Form"); } // ------------------------------------------------------ Instance Variables //private int lastId = 0; // -------------------------------------------------------------- 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.

*

This property must be kept as a * transient property using the {@link * UIComponent#getTransientStateHelper}.

*/ public boolean isSubmitted() { //return (this.submitted); return (Boolean) getTransientStateHelper().getTransient(PropertyKeys.submitted, false); } /** *

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.

*

This property must be kept as a * transient property using the {@link * UIComponent#getTransientStateHelper}.

*/ public void setSubmitted(boolean submitted) { //this.submitted = submitted; getTransientStateHelper().putTransient(PropertyKeys.submitted, submitted); } /** *

The prependId flag.

*/ //private Boolean prependId; public boolean isPrependId() { return (Boolean) getStateHelper().eval(PropertyKeys.prependId, true); } public void setPrependId(boolean prependId) { getStateHelper().put(PropertyKeys.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; } pushComponentToEL(context, this); Application app = context.getApplication(); app.publishEvent(context, PreValidateEvent.class, this); // Process all the facets and children of this component Iterator kids = getFacetsAndChildren(); while (kids.hasNext()) { UIComponent kid = (UIComponent) kids.next(); kid.processValidators(context); } app.publishEvent(context, PostValidateEvent.class, this); popComponentFromEL(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); } } /**

Generate an identifier for a component. The identifier * will be prefixed with UNIQUE_ID_PREFIX, and will be unique * within this component-container. Optionally, a unique seed value can * be supplied by component creators which should be * included in the generated unique id.

*

* If the prependId property has the value false, * this method must call createUniqueId on the next ancestor * UniqueIdVendor. *

* * @param context FacesContext * @param seed an optional seed value - e.g. based on the position of the component in the VDL-template * @return a unique-id in this component-container */ public String createUniqueId(FacesContext context, String seed) { if (isPrependId()) { Integer i = (Integer) getStateHelper().get(PropertyKeys.lastId); int lastId = ((i != null) ? i : 0); getStateHelper().put(PropertyKeys.lastId, ++lastId); return UIViewRoot.UNIQUE_ID_PREFIX + (seed == null ? lastId : seed); } else { UIComponent ancestorNamingContainer = (getParent() == null) ? null : getParent().getNamingContainer(); String uid = null; if (null != ancestorNamingContainer && ancestorNamingContainer instanceof UniqueIdVendor) { uid = ((UniqueIdVendor) ancestorNamingContainer).createUniqueId(context, seed); } else { uid = context.getViewRoot().createUniqueId(context, seed); } return uid; } } /** *

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; } /** * @see UIComponent#visitTree */ @Override public boolean visitTree(VisitContext context, VisitCallback callback) { // NamingContainers can optimize partial tree visits by taking advantage // of the fact that it is possible to detect whether any ids to visit // exist underneath the NamingContainer. If no such ids exist, there // is no need to visit the subtree under the NamingContainer. // UIForm is a bit different from other NamingContainers. It only acts // as a NamingContainer when prependId is true. Note that if it // weren't for this, we could push this implementation up in to // UIComponent and share it across all NamingContainers. Instead, // we currently duplicate this implementation in UIForm and // UINamingContainer, so that we can check isPrependId() here. if (!this.isPrependId()) { return super.visitTree(context, callback); } Collection idsToVisit = context.getSubtreeIdsToVisit(this); assert (idsToVisit != null); // If we have ids to visit, let the superclass implementation // handle the visit if (!idsToVisit.isEmpty()) { return super.visitTree(context, callback); } // If we have no child ids to visit, just visit ourselves, if // we are visitable. if (isVisitable(context)) { FacesContext facesContext = context.getFacesContext(); pushComponentToEL(facesContext, null); try { VisitResult result = context.invokeVisitCallback(this, callback); return (result == VisitResult.COMPLETE); } finally { popComponentFromEL(facesContext); } } // Done visiting this subtree. Return false to allow // visit to continue. return false; } }




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