SWF-489 - Add Spring MVC JSF integration to Spring Faces

spring-faces/src/main/java/org/springframework/faces/mvc/JsfView.java

@@ -0,0 +1,90 @@
+package org.springframework.faces.mvc;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.Map;
+
+import javax.faces.FacesException;
+import javax.faces.FactoryFinder;
+import javax.faces.component.UIViewRoot;
+import javax.faces.context.FacesContext;
+import javax.faces.context.FacesContextFactory;
+import javax.faces.event.PhaseId;
+import javax.faces.lifecycle.Lifecycle;
+import javax.faces.lifecycle.LifecycleFactory;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.faces.webflow.JsfUtils;
+import org.springframework.util.Assert;
+import org.springframework.web.servlet.view.AbstractUrlBasedView;
+
+/**
+ * JSF View that renders a transient (stateless) JSF view template. The UIViewRoot will not be saved and thus the JSF
+ * lifecycle will not be able to be invoked on postback.
+ * 
+ * @author Jeremy Grelle
+ */
+public class JsfView extends AbstractUrlBasedView {
+
+	private Lifecycle facesLifecycle;
+
+	public void afterPropertiesSet() throws Exception {
+		super.afterPropertiesSet();
+		facesLifecycle = createFacesLifecycle();
+	}
+
+	protected void renderMergedOutputModel(Map model, HttpServletRequest request, HttpServletResponse response)
+			throws Exception {
+
+		FacesContext facesContext = createFacesContext(request, response);
+
+		populateRequestMap(facesContext, model);
+
+		JsfUtils.notifyBeforeListeners(PhaseId.RESTORE_VIEW, facesLifecycle, facesContext);
+
+		UIViewRoot viewRoot = facesContext.getApplication().getViewHandler().createView(facesContext, getUrl());
+
+		Assert.notNull(viewRoot, "A JSF view could not be created for " + getUrl());
+		viewRoot.setTransient(true);
+		facesContext.setViewRoot(viewRoot);
+
+		JsfUtils.notifyAfterListeners(PhaseId.RESTORE_VIEW, facesLifecycle, facesContext);
+
+		facesContext.setViewRoot(viewRoot);
+		facesContext.renderResponse();
+		try {
+			JsfUtils.notifyBeforeListeners(PhaseId.RENDER_RESPONSE, facesLifecycle, facesContext);
+			logger.debug("Asking view handler to render view");
+			facesContext.getApplication().getViewHandler().renderView(facesContext, viewRoot);
+			JsfUtils.notifyAfterListeners(PhaseId.RENDER_RESPONSE, facesLifecycle, facesContext);
+		} catch (IOException e) {
+			throw new FacesException("An I/O error occurred during view rendering", e);
+		} finally {
+			logger.debug("View rendering complete");
+			facesContext.responseComplete();
+			facesContext.release();
+		}
+	}
+
+	private void populateRequestMap(FacesContext facesContext, Map model) {
+		Iterator i = model.keySet().iterator();
+		while (i.hasNext()) {
+			Object key = i.next();
+			facesContext.getExternalContext().getRequestMap().put(key, model.get(key));
+		}
+	}
+
+	private FacesContext createFacesContext(HttpServletRequest request, HttpServletResponse response) {
+		FacesContextFactory facesContextFactory = (FacesContextFactory) FactoryFinder
+				.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
+		return facesContextFactory.getFacesContext(getServletContext(), request, response, facesLifecycle);
+	}
+
+	private Lifecycle createFacesLifecycle() {
+		LifecycleFactory lifecycleFactory = (LifecycleFactory) FactoryFinder
+				.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
+		return lifecycleFactory.getLifecycle(LifecycleFactory.DEFAULT_LIFECYCLE);
+	}
+
+}