/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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 org.apache.myfaces.view.facelets.tag.jsf.core;

 import java.io.IOException;

 import java.util.ArrayList;

 import java.util.List;

 import javax.el.ELException;

 import javax.el.MethodExpression;

 import javax.faces.FacesException;

 import javax.faces.component.UIComponent;

 import javax.faces.component.UIViewRoot;

 import javax.faces.event.PhaseEvent;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.FaceletException;

 import javax.faces.view.facelets.TagAttribute;

 import javax.faces.view.facelets.TagConfig;

 import javax.faces.view.facelets.TagHandler;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletAttribute;

 import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFFaceletTag;

 import org.apache.myfaces.shared.util.StringUtils;

 import org.apache.myfaces.view.facelets.tag.jsf.ComponentSupport;

 /**

  * Container for all JavaServer Faces core and custom component actions used on a page. <p/> See <a target="_new"

  * href="http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/tlddocs/f/view.html">tag documentation</a>.

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 @JSFFaceletTag(

         name = "f:view",

         bodyContent = "empty", 

         componentClass="javax.faces.component.UIViewRoot")

 public final class ViewHandler extends TagHandler

 {

     private final static Class<?>[] LISTENER_SIG = new Class<?>[] { PhaseEvent.class };

     @JSFFaceletAttribute

     private final TagAttribute locale;

     @JSFFaceletAttribute

     private final TagAttribute renderKitId;

     @JSFFaceletAttribute

     private final TagAttribute contentType;

     @JSFFaceletAttribute

     private final TagAttribute encoding;

     @JSFFaceletAttribute

     private final TagAttribute beforePhase;

     @JSFFaceletAttribute

     private final TagAttribute afterPhase;

     @JSFFaceletAttribute(name="transient")

     private final TagAttribute transientAttribute;

     private final TagAttribute contracts;

     private final TagAttribute oamEnableViewPool;

     /**

      * @param config

      */

     public ViewHandler(TagConfig config)

     {

         super(config);

         this.locale = this.getAttribute("locale");

         this.renderKitId = this.getAttribute("renderKitId");

         this.contentType = this.getAttribute("contentType");

         this.encoding = this.getAttribute("encoding");

         this.beforePhase = this.getAttribute("beforePhase");

         this.afterPhase = this.getAttribute("afterPhase");

         this.transientAttribute = this.getAttribute("transient");

         this.contracts = this.getAttribute("contracts");

         this.oamEnableViewPool = this.getAttribute("oamEnableViewPool");

     }

     /**

      * See taglib documentation.

      * 

      * @see javax.faces.view.facelets.FaceletHandler#apply(javax.faces.view.facelets.FaceletContext, javax.faces.component.UIComponent)

      */

     public void apply(FaceletContext ctx, UIComponent parent) throws IOException, FacesException, FaceletException,

             ELException

     {

         UIViewRoot root = ComponentSupport.getViewRoot(ctx, parent);

         if (root != null)

         {

             if (this.locale != null)

             {

                 root.setLocale(ComponentSupport.getLocale(ctx, this.locale));

             }

             if (this.renderKitId != null)

             {

                 String v = this.renderKitId.getValue(ctx);

                 root.setRenderKitId(v);

             }

             String encodingValue = null;

             if (this.contentType != null)

             {

                 // This value is read as rfc2616 section 3.7 Media Types.

                 // We should check and extract the param "charset" and assing

                 // it as encoding for this page.

                 String v = this.contentType.getValue(ctx);

                 if (v != null)

                 {

                     int j = v.indexOf(';');

                     if (j >= 0)

                     {

                         int i = v.indexOf("charset",j);

                         if (i >= 0)

                         {

                             i = v.indexOf('=',i)+1;

                             if (v.length() > i)

                             {

                                 encodingValue = v.substring(i);

                             }

                             // Substract charset from encoding, it will be added 

                             // later on FaceletViewDeclarationLanguage.createResponseWriter

                             // by calling response.setContentType

                             v = v.substring(0 , j);

                         }

                     }

                 }

                 ctx.getFacesContext().getAttributes().put("facelets.ContentType", v);

             }

             if (this.encoding != null)

             {

                 String v = this.encoding.getValue(ctx);

                 ctx.getFacesContext().getAttributes().put("facelets.Encoding", v);

             }

             else if (encodingValue != null)

             {

                 ctx.getFacesContext().getAttributes().put("facelets.Encoding", encodingValue);

             }

             if (this.beforePhase != null)

             {

                 MethodExpression m = this.beforePhase.getMethodExpression(ctx, null, LISTENER_SIG);

                 root.setBeforePhaseListener(m);

             }

             if (this.afterPhase != null)

             {

                 MethodExpression m = this.afterPhase.getMethodExpression(ctx, null, LISTENER_SIG);

                 root.setAfterPhaseListener(m);

             }

             if (this.transientAttribute != null)

             {

                 root.setTransient(this.transientAttribute.getBoolean(ctx));

             }

             if (this.contracts != null)

             {

                 String contractsValue = this.contracts.getValue(ctx);

                 if (contractsValue != null)

                 {

                     String[] values = StringUtils.trim(

                         StringUtils.splitShortString(contractsValue, ','));

                     if (values != null)

                     {

                         List<String> list = new ArrayList<String>();

                         for (String v : values)

                         {

                             list.add(v);

                         }

                         ctx.getFacesContext().setResourceLibraryContracts(list);

                     }

                 }

             }

             if (this.oamEnableViewPool != null)

             {

                 root.getAttributes().put("oamEnableViewPool", this.oamEnableViewPool.getBoolean(ctx));

             }

         }

         this.nextHandler.apply(ctx, parent);

     }

 }