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The public API classes of the Apache MyFaces CORE JSF-2.2 project
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package jakarta.faces.component;
import jakarta.el.MethodExpression;
import jakarta.faces.context.FacesContext;
import jakarta.faces.context.FacesContextWrapper;
import jakarta.faces.event.AbortProcessingException;
import jakarta.faces.event.ActionEvent;
import jakarta.faces.event.ActionListener;
import jakarta.faces.event.FacesEvent;
import jakarta.faces.event.PhaseId;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFComponent;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFListener;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFProperty;
/**
* @since 2.2
*/
@JSFComponent(name = "f:viewAction")
public class UIViewAction extends UIComponentBase implements ActionSource
{
public static final String COMPONENT_FAMILY = "jakarta.faces.ViewAction";
public static final String COMPONENT_TYPE = "jakarta.faces.ViewAction";
/**
* Key in facesContext attribute map to check if a viewAction broadcast is
* being processed. This is used to check when a Faces lifecycle restart is required
* by the NavigationHandler implementation.
*/
private static final String BROADCAST_PROCESSING_KEY = "oam.viewAction.broadcast";
/**
* Key in facesContext attribute map to count the number of viewAction events that
* remains to be processed.
*/
private static final String EVENT_COUNT_KEY = "oam.viewAction.eventCount";
public UIViewAction()
{
setRendererType(null);
}
@JSFProperty(jspName="if") // Faces 4.1 : https://github.com/jakartaee/faces/issues/1811
@Override
public boolean isRendered()
{
return (Boolean) getStateHelper().eval(PropertyKeys.renderedAttr, true);
}
@Override
public void setRendered(final boolean condition)
{
getStateHelper().put(PropertyKeys.renderedAttr, condition);
}
@Override
public void broadcast(FacesEvent event) throws AbortProcessingException
{
super.broadcast(event);
FacesContext context = getFacesContext();
if (context.getResponseComplete())
{
return;
}
UIComponent c = event.getComponent();
UIViewRoot sourceViewRoot = null;
do
{
if (c instanceof UIViewRoot)
{
sourceViewRoot = (UIViewRoot) c;
break;
}
else
{
c = c.getParent();
}
} while (c != null);
if (!context.getViewRoot().equals(sourceViewRoot))
{
return;
}
if (event instanceof ActionEvent)
{
ActionListener defaultActionListener = context.getApplication().getActionListener();
if (defaultActionListener != null)
{
String viewIdBeforeAction = context.getViewRoot().getViewId();
Boolean oldBroadcastProcessing = (Boolean) context.getAttributes().
get(BROADCAST_PROCESSING_KEY);
try
{
context.getAttributes().put(BROADCAST_PROCESSING_KEY, Boolean.TRUE);
ViewActionFacesContextWrapper wrappedFacesContext = new ViewActionFacesContextWrapper(context);
try
{
wrappedFacesContext.setWrapperAsCurrentFacesContext();
if (event instanceof ViewActionEvent)
{
((ViewActionEvent) event).setFacesContext(wrappedFacesContext);
}
defaultActionListener.processAction((ActionEvent) event);
// Decrement count
Integer count = (Integer) context.getAttributes().get(EVENT_COUNT_KEY);
count = (count == null) ? 0 : count - 1;
context.getAttributes().put(EVENT_COUNT_KEY, count);
}
finally
{
wrappedFacesContext.restoreCurrentFacesContext();
}
}
finally
{
context.getAttributes().put(BROADCAST_PROCESSING_KEY,
oldBroadcastProcessing == null ? Boolean.FALSE : oldBroadcastProcessing);
}
if (context.getResponseComplete())
{
return;
}
else
{
Integer count = (Integer) context.getAttributes().get(EVENT_COUNT_KEY);
count = (count == null) ? 0 : count;
String viewIdAfterAction = context.getViewRoot().getViewId();
if (viewIdBeforeAction.equals(viewIdAfterAction) && count == 0)
{
context.renderResponse();
}
// "... Otherwise, execute the lifecycle on the new UIViewRoot ..."
// Note these words are implemented in the NavigationHandler, but
// the original proposal from seam s:viewAction did a trick here
// to restart the Faces lifecycle.
}
}
}
}
@Override
public void decode(FacesContext context)
{
super.decode(context);
if (context.isPostback() && !isOnPostback())
{
return;
}
if (!isRendered())
{
return;
}
ActionEvent evt = new ViewActionEvent(this);
String phase = getPhase();
PhaseId phaseId = phase != null
? PhaseId.phaseIdValueOf(phase)
: isImmediate() ? PhaseId.APPLY_REQUEST_VALUES : PhaseId.INVOKE_APPLICATION;
evt.setPhaseId(phaseId);
this.queueEvent(evt);
// "... Keep track of the number of events that are queued in this way
// on this run through the lifecycle. ...". The are two options:
// 1. Use an attribute over FacesContext attribute map
// 2. Use an attribute over the component
// If the view is recreated again with the same viewId, the component
// state get lost, so the option 1 is preferred.
Integer count = (Integer) context.getAttributes().get(EVENT_COUNT_KEY);
count = (count == null) ? 1 : count + 1;
context.getAttributes().put(EVENT_COUNT_KEY, count);
}
@JSFProperty
@Override
public boolean isImmediate()
{
return (Boolean) getStateHelper().eval(PropertyKeys.immediate, Boolean.FALSE);
}
@Override
public void setImmediate(boolean immediate)
{
getStateHelper().put(PropertyKeys.immediate, immediate );
}
@JSFProperty(stateHolder=true, returnSignature = "java.lang.Object", clientEvent="action")
@Override
public MethodExpression getActionExpression()
{
return (MethodExpression) getStateHelper().eval(PropertyKeys.actionExpression);
}
@Override
public void setActionExpression(MethodExpression actionExpression)
{
getStateHelper().put(PropertyKeys.actionExpression, actionExpression);
}
@Override
public void addActionListener(ActionListener listener)
{
addFacesListener(listener);
}
@Override
public void removeActionListener(ActionListener listener)
{
removeFacesListener(listener);
}
@JSFListener(event="jakarta.faces.event.ActionEvent",
phases="Invoke Application, Apply Request Values")
@Override
public ActionListener[] getActionListeners()
{
return (ActionListener[]) getFacesListeners(ActionListener.class);
}
@JSFProperty
public String getPhase()
{
return (String) getStateHelper().get(PropertyKeys.phase);
}
public void setPhase(String phase)
{
getStateHelper().put(PropertyKeys.phase, phase);
}
@JSFProperty
public boolean isOnPostback()
{
return (Boolean) getStateHelper().eval(PropertyKeys.onPostback, Boolean.FALSE);
}
public void setOnPostback(boolean onPostback)
{
getStateHelper().put(PropertyKeys.onPostback, onPostback );
}
public static boolean isProcessingBroadcast(FacesContext context)
{
return Boolean.TRUE.equals(context.getAttributes().get(BROADCAST_PROCESSING_KEY));
}
enum PropertyKeys
{
immediate
, value
, actionExpression
, actionListener
, phase
, onPostback
, renderedAttr("if");
private String name;
PropertyKeys()
{
}
PropertyKeys(final String name)
{
this.name = name;
}
@Override
public String toString()
{
return name != null ? name : super.toString();
}
}
@Override
public String getFamily()
{
return COMPONENT_FAMILY;
}
private static class ViewActionEvent extends ActionEvent
{
private static final long serialVersionUID = 1L;
private transient FacesContext facesContext;
public ViewActionEvent(FacesContext facesContext, UIComponent uiComponent)
{
super(facesContext, uiComponent);
this.facesContext = facesContext;
}
public ViewActionEvent(UIComponent uiComponent)
{
super(uiComponent);
}
@Override
public FacesContext getFacesContext()
{
if (facesContext != null)
{
return facesContext;
}
return super.getFacesContext();
}
void setFacesContext(FacesContext facesContext)
{
this.facesContext = facesContext;
}
}
private static class ViewActionFacesContextWrapper extends FacesContextWrapper
{
private FacesContext delegate;
private boolean renderResponseCalled;
public ViewActionFacesContextWrapper(FacesContext delegate)
{
this.delegate = delegate;
this.renderResponseCalled = false;
}
@Override
public void renderResponse()
{
//Take no action
renderResponseCalled = true;
}
public boolean isRenderResponseCalled()
{
return renderResponseCalled;
}
@Override
public FacesContext getWrapped()
{
return delegate;
}
void setWrapperAsCurrentFacesContext()
{
setCurrentInstance(this);
}
void restoreCurrentFacesContext()
{
setCurrentInstance(delegate);
}
}
}
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