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// RenderResponsePhase.java

package com.sun.faces.lifecycle;


import javax.faces.FacesException;
import javax.faces.view.ViewDeclarationLanguage;
import javax.faces.application.ViewHandler;
import javax.faces.context.FacesContext;
import javax.faces.context.PartialViewContext;
import javax.faces.event.PhaseId;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.sun.faces.util.FacesLogger;
import com.sun.faces.util.DebugUtil;

import javax.faces.event.PreRenderViewEvent;


/**
 * Lifetime And Scope  Same lifetime and scope as
 * DefaultLifecycleImpl.
 *
 */

public class RenderResponsePhase extends Phase {


    // Log instance for this class
    private static Logger LOGGER = FacesLogger.LIFECYCLE.getLogger();


    // ---------------------------------------------------------- Public Methods


    public void execute(FacesContext facesContext) throws FacesException {

        if (LOGGER.isLoggable(Level.FINE)) {
            LOGGER.fine("Entering RenderResponsePhase");
        }
        if (LOGGER.isLoggable(Level.FINE)) {
            LOGGER.fine("About to render view " +
                 facesContext.getViewRoot().getViewId());
        }
        // For requests intended to produce a partial response, we need prohibit
        // writing any content outside of the view itself (f:view).
        PartialViewContext partialViewContext = facesContext.getPartialViewContext();
        
        try {

            ViewHandler vh = facesContext.getApplication().getViewHandler();

            ViewDeclarationLanguage vdl =
                  vh.getViewDeclarationLanguage(facesContext,
                                                    facesContext.getViewRoot().getViewId());
            if (vdl != null) {
                vdl.buildView(facesContext, facesContext.getViewRoot());
            }

            boolean viewIdsUnchanged;
            do {
                String beforePublishViewId = facesContext.getViewRoot().getViewId();
                // the before render event on the view root is a special case to keep door open for navigation
                // this must be called *after* PDL.buildView() and before VH.renderView()
                facesContext.getApplication().publishEvent(facesContext,
                                                           PreRenderViewEvent.class,
                                                           facesContext.getViewRoot());
                String afterPublishViewId = facesContext.getViewRoot().getViewId();
                viewIdsUnchanged = beforePublishViewId == null && afterPublishViewId == null ||
                        (beforePublishViewId != null && afterPublishViewId != null) &&
                        beforePublishViewId.equals(afterPublishViewId);
                if (facesContext.getResponseComplete()) {
                    return;
                }
            } while (!viewIdsUnchanged);
            
            //render the view
            vh.renderView(facesContext, facesContext.getViewRoot());

        } catch (IOException e) {
            throw new FacesException(e.getMessage(), e);
        }

        if (LOGGER.isLoggable(Level.FINEST)) {
            LOGGER.log(Level.FINEST, "+=+=+=+=+=+= View structure printout for " + facesContext.getViewRoot().getViewId());
            DebugUtil.printTree(facesContext.getViewRoot(), LOGGER, Level.FINEST);
        }

        if (LOGGER.isLoggable(Level.FINE)) {
            LOGGER.fine("Exiting RenderResponsePhase");
        }

    }


    public PhaseId getId() {

        return PhaseId.RENDER_RESPONSE;

    }


// The testcase for this class is TestRenderResponsePhase.java

} // end of class RenderResponsePhase