/*
 * MappingViewHandler.java
 *
 * Created on 2 Οκτώβριος 2007, 7:52 μμ
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package gr.xfrag.faces.mapping;

import java.io.IOException;
import java.util.Locale;
import javax.faces.FacesException;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;

/**
 * This class in combination with the MappingFilter will take care of the mapping.
 * @author Chris Fragoulides
 */
public class MappingViewHandler extends ViewHandler{
    
    /**
     * The original handler we are extending.
     */
    private ViewHandler prevHandler = null;
    
    /** Creates a new instance of MappingViewHandler. By including
     * a parameter of the same type, we encourage the JSF framework
     * to pass a reference of the previously used ViewHandler. This way
     * we can use all the previous functionallity and override only the
     * method we are interested in (in this case, the getActionURL() method).
     */
    public MappingViewHandler(ViewHandler prevHandler) {
        this.prevHandler = prevHandler;
    }
    
    
    /**
     * Delegate control to the original ViewHandler
     */
    public Locale calculateLocale(FacesContext context) {
        return prevHandler.calculateLocale(context);
    }
    
    /**
     * Delegate control to the original ViewHandler
     */
    public String calculateRenderKitId(FacesContext context) {
        return prevHandler.calculateRenderKitId(context);
    }
    
    /**
     * Delegate control to the original ViewHandler
     */
    public UIViewRoot createView(FacesContext context, String viewId) {
        return prevHandler.createView(context, viewId);
    }
    
    /**
     * This is the only method needed to be extended. First, we get the
     * normal URL form the original ViewHandler. Then we simply return
     * the same URL with the extension stripped of.
     */
    public String getActionURL(FacesContext context, String viewId) {
        String origURL = prevHandler.getActionURL(context, viewId);
        int dotIdx = origURL.lastIndexOf(".");
        if (dotIdx > 0) {
            return origURL.substring(0,dotIdx);
        }
        else return origURL;
    }
    
    /**
     * Delegate control to the original ViewHandler
     */
    public String getResourceURL(FacesContext context, String path) {
        return prevHandler.getResourceURL(context, path);
    }
    
    /**
     * Delegate control to the original ViewHandler
     */
    public void renderView(FacesContext context, UIViewRoot viewToRender) 
        throws IOException, FacesException {
       prevHandler.renderView(context, viewToRender); 
    }
    
    /**
     * Delegate control to the original ViewHandler
     */
    public UIViewRoot restoreView(FacesContext context, String viewId) {
        return prevHandler.restoreView(context, viewId);
    }
    
    /**
     * Delegate control to the original ViewHandler
     */
    public void writeState(FacesContext context) throws IOException {
        prevHandler.writeState(context);
    }
    
}