/*

  * 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.Collection;

 import java.util.Enumeration;

 import java.util.HashSet;

 import java.util.Locale;

 import java.util.Map;

 import java.util.MissingResourceException;

 import java.util.ResourceBundle;

 import java.util.Set;

 import javax.el.ELException;

 import javax.faces.FacesException;

 import javax.faces.component.UIComponent;

 import javax.faces.component.UIViewRoot;

 import javax.faces.context.FacesContext;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.FaceletException;

 import javax.faces.view.facelets.TagAttribute;

 import javax.faces.view.facelets.TagAttributeException;

 import javax.faces.view.facelets.TagConfig;

 import javax.faces.view.facelets.TagHandler;

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

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

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

 /**

  * Load a resource bundle localized for the Locale of the current view, and expose it (as a Map) in the request

  * attributes of the current request. <p/> See <a target="_new"

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

  * 

  * @author Jacob Hookom

  * @version $Id$

  */

 @JSFFaceletTag(

         name = "f:loadBundle",

         bodyContent = "empty", 

         tagClass="org.apache.myfaces.taglib.core.LoadBundleTag")

 public final class LoadBundleHandler extends TagHandler

 {

     private final static class ResourceBundleMap implements Map<String, String>

     {

         private final static class ResourceEntry implements Map.Entry<String, String>

         {

             protected final String key;

             protected final String value;

             public ResourceEntry(String key, String value)

             {

                 this.key = key;

                 this.value = value;

             }

             public String getKey()

             {

                 return this.key;

             }

             public String getValue()

             {

                 return this.value;

             }

             public String setValue(String value)

             {

                 throw new UnsupportedOperationException();

             }

             public int hashCode()

             {

                 return this.key.hashCode();

             }

             public boolean equals(Object obj)

             {

                 return (obj instanceof ResourceEntry && this.hashCode() == obj.hashCode());

             }

         }

         protected final ResourceBundle bundle;

         public ResourceBundleMap(ResourceBundle bundle)

         {

             this.bundle = bundle;

         }

         public void clear()

         {

             throw new UnsupportedOperationException();

         }

         public boolean containsKey(Object key)

         {

             try

             {

                 bundle.getString(key.toString());

                 return true;

             }

             catch (MissingResourceException e)

             {

                 return false;

             }

         }

         public boolean containsValue(Object value)

         {

             throw new UnsupportedOperationException();

         }

         public Set<Map.Entry<String, String>> entrySet()

         {

             Enumeration<String> e = this.bundle.getKeys();

             Set<Map.Entry<String, String>> s = new HashSet<Map.Entry<String, String>>();

             String k;

             while (e.hasMoreElements())

             {

                 k = e.nextElement();

                 s.add(new ResourceEntry(k, this.bundle.getString(k)));

             }

             return s;

         }

         public String get(Object key)

         {

             try

             {

                 return this.bundle.getString((String) key);

             }

             catch (java.util.MissingResourceException mre)

             {

                 return "???" + key + "???";

             }

         }

         public boolean isEmpty()

         {

             return false;

         }

         public Set<String> keySet()

         {

             Enumeration<String> e = this.bundle.getKeys();

             Set<String> s = new HashSet<String>();

             while (e.hasMoreElements())

             {

                 s.add(e.nextElement());

             }

             return s;

         }

         public String put(String key, String value)

         {

             throw new UnsupportedOperationException();

         }

         public void putAll(Map<? extends String, ? extends String> t)

         {

             throw new UnsupportedOperationException();

         }

         public String remove(Object key)

         {

             throw new UnsupportedOperationException();

         }

         public int size()

         {

             return this.keySet().size();

         }

         public Collection<String> values()

         {

             Enumeration<String> e = this.bundle.getKeys();

             Set<String> s = new HashSet<String>();

             while (e.hasMoreElements())

             {

                 s.add(this.bundle.getString(e.nextElement()));

             }

             return s;

         }

     }

     private final TagAttribute basename;

     private final TagAttribute var;

     /**

      * @param config

      */

     public LoadBundleHandler(TagConfig config)

     {

         super(config);

         this.basename = this.getRequiredAttribute("basename");

         this.var = this.getRequiredAttribute("var");

     }

     /**

      * 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);

         ResourceBundle bundle = null;

         try

         {

             String name = this.basename.getValue(ctx);

             ClassLoader cl = ClassUtils.getContextClassLoader();

             if (root != null && root.getLocale() != null)

             {

                 bundle = ResourceBundle.getBundle(name, root.getLocale(), cl);

             }

             else

             {

                 bundle = ResourceBundle.getBundle(name, Locale.getDefault(), cl);

             }

         }

         catch (Exception e)

         {

             throw new TagAttributeException(this.tag, this.basename, e);

         }

         ResourceBundleMap map = new ResourceBundleMap(bundle);

         FacesContext faces = ctx.getFacesContext();

         faces.getExternalContext().getRequestMap().put(this.var.getValue(ctx), map);

     }

 }