/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * Licensed 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.internal;

 import java.util.List;

 import javax.faces.FacesException;

 import javax.faces.FactoryFinder;

 import javax.faces.application.Application;

 import javax.faces.component.UIComponent;

 import javax.faces.context.FacesContext;

 import javax.faces.context.ResponseWriter;

 import javax.faces.convert.Converter;

 import javax.faces.el.ValueBinding;

 import javax.faces.lifecycle.LifecycleFactory;

 import javax.faces.render.RenderKit;

 import javax.faces.render.RenderKitFactory;

 import javax.faces.validator.Validator;

 import javax.faces.webapp.FacesServlet;

 import javax.servlet.ServletConfig;

 import javax.servlet.ServletException;

 import javax.servlet.jsp.PageContext;

 /**

  * @author shot

  *

  * This class might be changed without notice. Please do not use it

  * excluding the JSF specification part.

  */

 public class WebAppUtil {

     private WebAppUtil() {

     }

     public static UIComponent createComponent(FacesContext context,

             String binding, String componentType) {

         UIComponent component = null;

         Application application = context.getApplication();

         if (binding != null) {

             ValueBinding vb = application.createValueBinding(binding);

             component = application.createComponent(vb, context, componentType);

             component.setValueBinding("binding", vb);

         } else {

             component = application.createComponent(componentType);

         }

         return component;

     }

     public static List getCreatedComponentIds(UIComponent component) {

         return (List) component.getAttributes().get(

                 InternalConstants.JSP_CREATED_COMPONENT_IDS);

     }

     public static void setCreatedComponentIds(UIComponent component,

             List createdComponents) {

         component.getAttributes().put(

                 InternalConstants.JSP_CREATED_COMPONENT_IDS, createdComponents);

     }

     public static void removeCreatedComponentIds(UIComponent component) {

         component.getAttributes().remove(

                 InternalConstants.JSP_CREATED_COMPONENT_IDS);

     }

     public static List getCreatedFacetNames(UIComponent component) {

         return (List) component.getAttributes().get(

                 InternalConstants.JSP_CREATED_FACET_NAMES);

     }

     public static void setCreatedFacetNames(UIComponent component,

             List createdComponents) {

         component.getAttributes().put(

                 InternalConstants.JSP_CREATED_FACET_NAMES, createdComponents);

     }

     public static void removeCreatedFacetNames(UIComponent component) {

         component.getAttributes().remove(

                 InternalConstants.JSP_CREATED_FACET_NAMES);

     }

     public static ResponseWriter buildResponseWriter(FacesContext facesContext,

             PageContext pageContext) {

         RenderKitFactory factory = (RenderKitFactory) FactoryFinder

                 .getFactory(FactoryFinder.RENDER_KIT_FACTORY);

         RenderKit renderKit = factory.getRenderKit(facesContext, facesContext

                 .getViewRoot().getRenderKitId());

         PageContextOutWriter writer = new PageContextOutWriter(pageContext);

         String encoding = pageContext.getRequest().getCharacterEncoding();

         FacesContext context = FacesContext.getCurrentInstance();

         String acceptContentTypes = getAcceptHeader(context);

         return renderKit.createResponseWriter(writer, acceptContentTypes,

                 encoding);

     }

     public static String getAcceptHeader(FacesContext context) {

         return (String) context.getExternalContext().getRequestHeaderMap().get(

                 "accept");

     }

     public static Object getValueFromCreatedValueBinding(String buindName) {

         FacesContext context = getFacesContext();

         ValueBinding vb = context.getApplication()

                 .createValueBinding(buindName);

         return vb.getValue(context);

     }

     public static Converter createConverter(String converterId) {

         FacesContext context = getFacesContext();

         return context.getApplication().createConverter(converterId);

     }

     public static Converter createConverter(Class clazz) {

         FacesContext context = getFacesContext();

         return context.getApplication().createConverter(clazz);

     }

     public static Validator createValidator(String validatorId) {

         FacesContext context = getFacesContext();

         return context.getApplication().createValidator(validatorId);

     }

     public static FacesContext getFacesContext() {

         return FacesContext.getCurrentInstance();

     }

     public static Object getFactory(String factoryName) throws ServletException {

         try {

             return FactoryFinder.getFactory(factoryName);

         } catch (FacesException e) {

             Throwable rootCause = e.getCause();

             if (rootCause == null) {

                 throw e;

             } else {

                 throw new ServletException(e.getMessage(), rootCause);

             }

         }

     }

     public static String getLifecycleId(ServletConfig config) {

         String lifecycleId = config.getServletContext().getInitParameter(

                 FacesServlet.LIFECYCLE_ID_ATTR);

         if (lifecycleId == null) {

             lifecycleId = LifecycleFactory.DEFAULT_LIFECYCLE;

         }

         return lifecycleId;

     }

 }