/*

  * 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.compiler;

 import java.io.IOException;

 import java.lang.reflect.Method;

 import java.util.Map;

 import javax.el.ELContext;

 import javax.el.ELException;

 import javax.el.FunctionMapper;

 import javax.faces.FacesException;

 import javax.faces.component.UIComponent;

 import javax.faces.view.facelets.ComponentHandler;

 import javax.faces.view.facelets.FaceletContext;

 import javax.faces.view.facelets.FaceletException;

 import javax.faces.view.facelets.FaceletHandler;

 import org.apache.myfaces.el.unified.FacesELContext;

 import org.apache.myfaces.view.facelets.el.CompositeFunctionMapper;

 import org.apache.myfaces.view.facelets.tag.TagLibrary;

 import org.apache.myfaces.view.facelets.tag.composite.CompositeComponentResourceTagHandler;

 final class NamespaceHandler extends FunctionMapper implements FaceletHandler

 {

     private final TagLibrary library;

     private final Map<String, String> ns;

     private FaceletHandler next;

     public NamespaceHandler(FaceletHandler next, TagLibrary library, Map<String, String> ns)

     {

         this.library = library;

         this.ns = ns;

         this.next = next;

     }

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

             ELException

     {

         FunctionMapper orig = ctx.getFunctionMapper();

         ELContext elContext = ctx.getFacesContext().getELContext();

         if (elContext instanceof FacesELContext)

         {

             ((FacesELContext) elContext).setFunctionMapper(this);

         }

         ctx.setFunctionMapper(new CompositeFunctionMapper(this, orig));

         try

         {

             next.apply(ctx, parent);

         }

         finally

         {

             ctx.setFunctionMapper(orig);

         }

     }

     public Method resolveFunction(String prefix, String localName)

     {

         String uri = (String) this.ns.get(prefix);

         if (uri != null)

         {

             return this.library.createFunction(uri, localName);

         }

         return null;

     }

     public boolean isNextHandlerComponent()

     {

         return (next instanceof ComponentHandler);

     }

     public boolean isNextHandlerCompositeComponent()

     {

         return (next instanceof CompositeComponentResourceTagHandler);

     }

 }