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package com.sun.faces.application.view;
import java.io.IOException;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.FacesException;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.context.ExternalContext;
import javax.faces.view.ViewDeclarationLanguage;
import com.sun.faces.application.ApplicationAssociate;
import com.sun.faces.config.WebConfiguration;
import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.Util;
/**
*
* This represents how a particular page description language
* is to be rendered/restored.
*
*/
public abstract class ViewHandlingStrategy extends ViewDeclarationLanguage {
private static final Logger logger = FacesLogger.APPLICATION.getLogger();
protected ApplicationAssociate associate;
protected WebConfiguration webConfig;
// ------------------------------------------------------------ Constructors
public ViewHandlingStrategy() {
FacesContext ctx = FacesContext.getCurrentInstance();
webConfig = WebConfiguration.getInstance(ctx.getExternalContext());
associate = ApplicationAssociate.getInstance(ctx.getExternalContext());
}
// ---------------------------------------------------------- Public Methods
/**
* @see ViewDeclarationLanguage#restoreView(javax.faces.context.FacesContext, String)
*/
@Override
public UIViewRoot restoreView(FacesContext ctx,
String viewId) {
ExternalContext extContext = ctx.getExternalContext();
String mapping = Util.getFacesMapping(ctx);
UIViewRoot viewRoot = null;
// maping could be null if a non-faces request triggered
// this response.
if (extContext.getRequestPathInfo() == null && mapping != null &&
Util.isPrefixMapped(mapping)) {
// this was probably an initial request
// send them off to the root of the web application
try {
ctx.responseComplete();
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "Response Complete for" + viewId);
}
if (!extContext.isResponseCommitted()) {
extContext.redirect(extContext.getRequestContextPath());
}
} catch (IOException ioe) {
throw new FacesException(ioe);
}
} else {
// this is necessary to allow decorated impls.
ViewHandler outerViewHandler =
ctx.getApplication().getViewHandler();
String renderKitId =
outerViewHandler.calculateRenderKitId(ctx);
viewRoot = Util.getStateManager(ctx).restoreView(ctx,
viewId,
renderKitId);
}
return viewRoot;
}
/**
* @see ViewDeclarationLanguage#createView(javax.faces.context.FacesContext, String)
*/
@Override
public UIViewRoot createView(FacesContext ctx,
String viewId) {
Util.notNull("context", ctx);
UIViewRoot result = (UIViewRoot)
ctx.getApplication()
.createComponent(UIViewRoot.COMPONENT_TYPE);
Locale locale = null;
String renderKitId = null;
// use the locale from the previous view if is was one which will be
// the case if this is called from NavigationHandler. There wouldn't be
// one for the initial case.
if (ctx.getViewRoot() != null) {
locale = ctx.getViewRoot().getLocale();
renderKitId = ctx.getViewRoot().getRenderKitId();
}
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "Created new view for " + viewId);
}
// PENDING(): not sure if we should set the RenderKitId here.
// The UIViewRoot ctor sets the renderKitId to the default
// one.
// if there was no locale from the previous view, calculate the locale
// for this view.
if (locale == null) {
locale = ctx.getApplication().getViewHandler().calculateLocale(ctx);
if (logger.isLoggable(Level.FINE)) {
logger.fine(
"Locale for this view as determined by calculateLocale "
+ locale.toString());
}
} else {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Using locale from previous view "
+ locale.toString());
}
}
if (renderKitId == null) {
renderKitId =
ctx.getApplication().getViewHandler()
.calculateRenderKitId(ctx);
if (logger.isLoggable(Level.FINE)) {
logger.fine(
"RenderKitId for this view as determined by calculateRenderKitId "
+ renderKitId);
}
} else {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Using renderKitId from previous view "
+ renderKitId);
}
}
result.setLocale(locale);
result.setRenderKitId(renderKitId);
result.setViewId(viewId);
return result;
}
/**
*
* @param viewId the view ID
* @return true if this ViewHandlingStrategy
* handles the the view type represented by viewId
*/
public abstract boolean handlesViewId(String viewId);
}