/*
    * 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.impl;
  
  import javax.faces.application.ProjectStage;
  import javax.faces.application.ViewHandler;
  import javax.faces.context.ExternalContext;
  import javax.faces.context.FacesContext;
  import javax.faces.view.facelets.FaceletCache;
  import javax.faces.view.facelets.FaceletCacheFactory;
  
  import org.apache.myfaces.shared.util.WebConfigParamUtils;
  import org.apache.myfaces.view.facelets.ELExpressionCacheMode;
  import org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage;
  
  /**
   * 
   * @author Leonardo Uribe
   * @since 2.1.0
   *
   */
  public class FaceletCacheFactoryImpl extends FaceletCacheFactory
  {
      private final static String PARAM_REFRESH_PERIOD_DEPRECATED = "facelets.REFRESH_PERIOD";
      
      private final static String[] PARAMS_REFRESH_PERIOD
              = {ViewHandler.FACELETS_REFRESH_PERIOD_PARAM_NAME, PARAM_REFRESH_PERIOD_DEPRECATED};
  
  
      @Override
      public FaceletCache getFaceletCache()
      {
          FacesContext context = FacesContext.getCurrentInstance();
          ExternalContext eContext = context.getExternalContext();
          // refresh period
          long refreshPeriod;
          if(context.isProjectStage(ProjectStage.Production))
          {
              refreshPeriod = WebConfigParamUtils.getLongInitParameter(eContext, PARAMS_REFRESH_PERIOD,
                      FaceletViewDeclarationLanguage.DEFAULT_REFRESH_PERIOD_PRODUCTION);
          }
          else
          {
              refreshPeriod = WebConfigParamUtils.getLongInitParameter(eContext, PARAMS_REFRESH_PERIOD,
                      FaceletViewDeclarationLanguage.DEFAULT_REFRESH_PERIOD);
          }
          
          String elMode = WebConfigParamUtils.getStringInitParameter(
                      context.getExternalContext(),
                      FaceletCompositionContextImpl.INIT_PARAM_CACHE_EL_EXPRESSIONS, 
                          ELExpressionCacheMode.noCache.name());
          
          if (ELExpressionCacheMode.alwaysRecompile.toString().equals(elMode))
          {
              return new CacheELFaceletCacheImpl(refreshPeriod);
          }
          else
          {
              return new FaceletCacheImpl(refreshPeriod);
          }
      }
  
  }