/*

  * 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.shared.resource;

 import java.util.regex.Pattern;

 import javax.faces.context.FacesContext;

 import javax.faces.view.Location;

 /**

  * Utility class when used in EL Expressions --> #{resource}

  */

 public class ResourceELUtils

 {

     // TODO: check this expression, maybe we can make it simpler, because "resource" implicit object

     // cannot be preceded by anything.

     public static final Pattern RESOURCE_EXPRESSION_REGEX = Pattern.compile(".*[^\\w\\.]resource[^\\w].*");

     private static final String RESOURCE = "resource";

     public static final String RESOURCE_LOCATION_KEY = "org.apache.myfaces.view.facelets.resource.location";

     public static final String RESOURCE_THIS_LIBRARY = "oam.resource.library";

     public static final String RESOURCE_THIS_CONTRACT = "oam.resource.contract";

     public static boolean isResourceExpression(String expression)

     {

         if (expression.contains(RESOURCE))

         {

             return RESOURCE_EXPRESSION_REGEX.matcher(expression).matches();

         }

         else

         {

             return false;

         }

     }

     public static Location getResourceLocationForResolver(FacesContext facesContext)

     {

         return (Location) facesContext.getAttributes().get(RESOURCE_LOCATION_KEY);

     }

     public static void saveResourceLocationForResolver(FacesContext facesContext, Location location)

     {

         facesContext.getAttributes().put(RESOURCE_LOCATION_KEY, location);

     }

     public static void removeResourceLocationForResolver(FacesContext facesContext)

     {

         facesContext.getAttributes().remove(RESOURCE_LOCATION_KEY);

     }

     public static String getResourceContractForResolver(FacesContext facesContext)

     {

         return (String) facesContext.getAttributes().get(RESOURCE_THIS_CONTRACT);

     }

     public static void saveResourceContractForResolver(FacesContext facesContext, String location)

     {

         facesContext.getAttributes().put(RESOURCE_THIS_CONTRACT, location);

     }

     public static void removeResourceContractForResolver(FacesContext facesContext)

     {

         facesContext.getAttributes().remove(RESOURCE_THIS_CONTRACT);

     }

     public static String getResourceLibraryForResolver(FacesContext facesContext)

     {

         return (String) facesContext.getAttributes().get(RESOURCE_THIS_LIBRARY);

     }

     public static void saveResourceLibraryForResolver(FacesContext facesContext, String location)

     {

         facesContext.getAttributes().put(RESOURCE_THIS_LIBRARY, location);

     }

     public static void removeResourceLibraryForResolver(FacesContext facesContext)

     {

         facesContext.getAttributes().remove(RESOURCE_THIS_LIBRARY);

     }

 }