2009/05/20 - Apache Shale has been retired.

   /*
    * 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.shale.test.el;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.Map.Entry;
  
  import javax.el.ELContext;
  import javax.el.PropertyNotFoundException;
  import javax.faces.context.ExternalContext;
  import javax.faces.context.FacesContext;
  
  /***
   * <p><code>ELResolver</code> implementation that accesses scoped variables
   * in the current request context.  See the JSF 1.2 Specification, section
   * 5.6.2.7, for requirements implemented by this class.</p>
   *
   * @since 1.0.4
   */
  public class FacesScopedAttributeELResolver extends AbstractELResolver {
      
  
      /***
       * <p>Return the most general type this resolver accepts for the
       * <code>property</code> argument.</p>
       */
      public Class getCommonPropertyType(ELContext context, Object base) {
  
          if (base != null) {
              return null;
          } else {
              return String.class;
          }
  
      }
  
  
      /***
       * <p>Return an <code>Iterator</code> over the attributes that this
       * resolver knows how to deal with.</p>
       *
       * @param context <code>ELContext</code> for evaluating this value
       * @param base Base object against which this evaluation occurs
       */
      public Iterator getFeatureDescriptors(ELContext context, Object base) {
  
          if (base != null) {
              return null;
          }
  
          // Create the variables we will need
          FacesContext fcontext = (FacesContext) context.getContext(FacesContext.class);
          ExternalContext econtext = fcontext.getExternalContext();
          List descriptors = new ArrayList();
          Map map = null;
          Set set = null;
          Iterator items = null;
          String key = null;
          Object value = null;
  
          // Add feature descriptors for request scoped attributes
          set = econtext.getRequestMap().entrySet();
          items = set.iterator();
          while (items.hasNext()) {
              Entry item = (Entry) items.next();
              key = (String) item.getKey();
              value = item.getValue();
              descriptors.add(descriptor(key, key, "Request Scope Attribute " + key,
                                         false, false, true, value.getClass(), true));
          }
  
          // Add feature descriptors for session scoped attributes
          set = econtext.getSessionMap().entrySet();
          items = set.iterator();
          while (items.hasNext()) {
              Entry item = (Entry) items.next();
              key = (String) item.getKey();
              value = item.getValue();
              descriptors.add(descriptor(key, key, "Session Scope Attribute " + key,
                                         false, false, true, value.getClass(), true));
         }
 
         // Add feature descriptors for application scoped attributes
         set = econtext.getApplicationMap().entrySet();
         items = set.iterator();
         while (items.hasNext()) {
             Entry item = (Entry) items.next();
             key = (String) item.getKey();
             value = item.getValue();
             descriptors.add(descriptor(key, key, "Application Scope Attribute " + key,
                                        false, false, true, value.getClass(), true));
         }
 
         // Return the accumulated descriptors
         return descriptors.iterator();
 
     }
 
 
 
     /***
      * <p>Return the Java type of the specified property.</p>
      *
      * @param context <code>ELContext</code> for evaluating this value
      * @param base Base object against which this evaluation occurs
      *  (must be null because we are evaluating a top level variable)
      * @param property Property name to be accessed
      */
     public Class getType(ELContext context, Object base, Object property) {
 
         if (base != null) {
             return null;
         }
         if (property == null) {
             throw new PropertyNotFoundException("No property specified");
         }
         context.setPropertyResolved(true);
         return Object.class;
 
     }
 
 
     /***
      * <p>Return an existing scoped object for the specified name (if any);
      * otherwise, return <code>null</code>.</p>
      *
      * @param context <code>ELContext</code> for evaluating this value
      * @param base Base object against which this evaluation occurs
      *  (must be null because we are evaluating a top level variable)
      * @param property Property name to be accessed
      */
     public Object getValue(ELContext context, Object base, Object property) {
 
         if (base != null) {
             return null;
         }
         if (property == null) {
             throw new PropertyNotFoundException("No property specified");
         }
 
         FacesContext fcontext = (FacesContext) context.getContext(FacesContext.class);
         ExternalContext econtext = fcontext.getExternalContext();
         Object value = null;
         value = econtext.getRequestMap().get(property);
         if (value != null) {
             context.setPropertyResolved(true);
             return value;
         }
         value = econtext.getSessionMap().get(property);
         if (value != null) {
             context.setPropertyResolved(true);
             return value;
         }
         value = econtext.getApplicationMap().get(property);
         if (value != null) {
             context.setPropertyResolved(true);
             return value;
         }
 
         return null;
 
     }
 
 
     /***
      * <p>Return <code>true</code> if the specified property is read only.</p>
      *
      * @param context <code>ELContext</code> for evaluating this value
      * @param base Base object against which this evaluation occurs
      *  (must be null because we are evaluating a top level variable)
      * @param property Property name to be accessed
      */
     public boolean isReadOnly(ELContext context, Object base, Object property) {
 
         if (base == null) {
             context.setPropertyResolved(true);
             return false;
         }
         return false;
 
     }
 
 
 
     /***
      * <p>Set the value of a scoped object for the specified name.</p>
      *
      * @param context <code>ELContext</code> for evaluating this value
      * @param base Base object against which this evaluation occurs
      *  (must be null because we are evaluating a top level variable)
      * @param property Property name to be accessed
      * @param value New value to be set
      */
     public void setValue(ELContext context, Object base, Object property, Object value) {
 
         if (base != null) {
             return;
         }
         if (property == null) {
             throw new PropertyNotFoundException("No property specified");
         }
 
         context.setPropertyResolved(true);
         String key = property.toString();
         Object result = null;
         FacesContext fcontext = (FacesContext) context.getContext(FacesContext.class);
         ExternalContext econtext = fcontext.getExternalContext();
 
         if (econtext.getRequestMap().containsKey(property)) {
             econtext.getRequestMap().put(key, value);
         } else if (econtext.getSessionMap().containsKey(property)) {
             econtext.getSessionMap().put(key, value);
         } else if (econtext.getApplicationMap().containsKey(property)) {
             econtext.getApplicationMap().put(key, value);
         } else {
             econtext.getRequestMap().put(key, value);
         }
 
     }
 
 
 }