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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 javax.faces.context;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.el.ELContext;
import javax.faces.application.Application;
import javax.faces.application.FacesMessage;
import javax.faces.application.ProjectStage;
import javax.faces.component.UINamingContainer;
import javax.faces.component.UIViewRoot;
import javax.faces.event.PhaseId;
import javax.faces.render.RenderKit;
/**
* see Javadoc of JSF Specification
*/
public abstract class FacesContext
{
private static ThreadLocal currentInstance = new ThreadLocal();
private static ThreadLocal firstInstance = new ThreadLocal();
public abstract void addMessage(String clientId, FacesMessage message);
public abstract Application getApplication();
/**
*
* @return
*
* @since 2.0
*/
public Map getAttributes()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.getAttributes();
}
public abstract Iterator getClientIdsWithMessages();
public static FacesContext getCurrentInstance()
{
return currentInstance.get();
}
/**
*
* @return
*
* @since 2.0
*/
public PhaseId getCurrentPhaseId()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.getCurrentPhaseId();
}
/**
* Return the context within which all EL-expressions are evaluated.
*
* A JSF implementation is expected to provide a full implementation of this class. However JSF also explicitly
* allows user code to apply the "decorator" pattern to this type, by overriding the FacesContextFactory class. In
* that pattern, the decorating class has a reference to an "underlying" implementation and forward calls to it,
* possibly after taking other related actions.
*
* The decorator pattern does have difficulties with backwards-compatibility when new methods are added to the class
* being decorated, as with this method which was added in JSF1.2. Decorator classes that were written for JSF1.1
* will subclass this class, but will not override this method to pass the call on to the "underlying" instance.
* This base implementation therefore must do that for it.
*
* Unfortunately the JSF designers stuffed up the design; this base class has no way of knowing what the
* "underlying" instance is! The current implementation here is therefore to delegate directly to the very
* first FacesContext instance registered within this request (via setCurrentInstance). This instance should
* be the "full" implementation provided by the JSF framework. The drawback is that when any decorator class is
* present which defaults to this base implementation, then any following decorator instances that do override this
* method do not get it invoked.
*
* It is believed that the Sun JSF implementation (Mojarra) does something similar.
*
* @since 1.2
*/
public ELContext getELContext()
{
// Do NOT use getCurrentInstance here. For FacesContext decorators that
// register themselves as "the current instance" that will cause an
// infinite loop. For FacesContext decorators that do not register
// themselves as "the current instance", if they are themselves wrapped
// by a decorator that *does* register itself, then an infinite loop
// also occurs.
//
// As noted above, we really want to do something like
// ctx = getWrappedInstance();
// where the subclass can return the object it is delegating to.
// As there is no such method, however, the best we can do is pass the
// method call on to the first-registered FacesContext instance. That
// instance will never be "this", as the real original FacesContext
// object will provide a proper implementation of this method.
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new NullPointerException(FacesContext.class.getName());
}
ELContext elctx = ctx.getELContext();
if (elctx == null)
{
throw new UnsupportedOperationException();
}
return elctx;
}
/**
*
* @return
*
* @since 2.0
*/
public ExceptionHandler getExceptionHandler()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.getExceptionHandler();
}
public abstract ExternalContext getExternalContext();
public abstract FacesMessage.Severity getMaximumSeverity();
/**
*
* @return
*
* @since 2.0
*/
public List getMessageList()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.getMessageList();
}
/**
*
* @param clientId
* @return
*
* @since 2.0
*/
public List getMessageList(String clientId)
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.getMessageList(clientId);
}
public abstract Iterator getMessages();
public abstract Iterator getMessages(String clientId);
/**
*
* Return the PartialViewContext for this request. The PartialViewContext is used to control the processing of
* specified components during the execute portion of the request processing lifecycle (known as partial processing)
* and the rendering of specified components (known as partial rendering). This method must return a new
* PartialViewContext if one does not already exist.
*
*
* @return The PartialViewContext
* @throws IllegalStateException
* if this method is called after this instance has been released
*
* @since 2.0
*/
public PartialViewContext getPartialViewContext()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.getPartialViewContext();
}
public abstract RenderKit getRenderKit();
public abstract boolean getRenderResponse();
public abstract boolean getResponseComplete();
public abstract ResponseStream getResponseStream();
public abstract ResponseWriter getResponseWriter();
/**
*
* @return
*
* @since 2.0
*/
public boolean isValidationFailed()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.isValidationFailed();
}
public abstract UIViewRoot getViewRoot();
/**
*
* @return
*
* @since 2.0
*/
public boolean isPostback()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.isPostback();
}
/**
*
* @return
*
* @since 2.0
*/
public boolean isProcessingEvents()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.isProcessingEvents();
}
public abstract void release();
public abstract void renderResponse();
public abstract void responseComplete();
protected static void setCurrentInstance(FacesContext context)
{
if (context == null)
{
currentInstance.remove();
firstInstance.remove();
}
else
{
currentInstance.set(context);
if (firstInstance.get() == null)
{
firstInstance.set(context);
}
}
}
/**
*
* @param currentPhaseId
* @since 2.0
*/
public void setCurrentPhaseId(PhaseId currentPhaseId)
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
ctx.setCurrentPhaseId(currentPhaseId);
}
/**
*
* @param exceptionHandler
* @since 2.0
*/
public void setExceptionHandler(ExceptionHandler exceptionHandler)
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
ctx.setExceptionHandler(exceptionHandler);
}
/**
*
* @param processingEvents
* @since 2.0
*/
public void setProcessingEvents(boolean processingEvents)
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
ctx.setProcessingEvents(processingEvents);
}
public abstract void setResponseStream(ResponseStream responseStream);
public abstract void setResponseWriter(ResponseWriter responseWriter);
public abstract void setViewRoot(UIViewRoot root);
/**
*
*
* @since 2.0
*/
public void validationFailed()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
ctx.validationFailed();
}
public boolean isProjectStage(ProjectStage stage)
{
if (stage == null)
{
throw new NullPointerException();
}
if (stage.equals(getApplication().getProjectStage()))
{
return true;
}
return false;
}
/**
*
* @since 2.1
* @return
*/
public boolean isReleased()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
throw new UnsupportedOperationException();
}
return ctx.isReleased();
}
/**
* @since 2.2
* @return
*/
public List getResourceLibraryContracts()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
return Collections.emptyList();
}
return ctx.getResourceLibraryContracts();
}
/**
* @since 2.2
* @param contracts
*/
public void setResourceLibraryContracts(List contracts)
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
return;
}
ctx.setResourceLibraryContracts(contracts);
}
/**
* @since 2.2
* @return
*/
public char getNamingContainerSeparatorChar()
{
FacesContext ctx = firstInstance.get();
if (ctx == null)
{
return UINamingContainer.getSeparatorChar(this);
}
return ctx.getNamingContainerSeparatorChar();
}
}