/**
    * This file Copyright (c) 2003-2011 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.cms.beans.config;
  
  import info.magnolia.cms.core.Content;
  import info.magnolia.content2bean.Content2BeanUtil;
  import info.magnolia.content2bean.TransformationState;
  import info.magnolia.content2bean.TypeDescriptor;
  import info.magnolia.content2bean.impl.Content2BeanTransformerImpl;
  import info.magnolia.objectfactory.Components;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Store for all virtual URI to template/page mapping.
   *
   * @author Sameer Charles
   * @version 2.0
   */
  public final class VirtualURIManager extends ObservedManager {
  
      private static final Logger log = LoggerFactory.getLogger(VirtualURIManager.class);
  
      public static final String FROM_URI_NODEDATANAME = "fromURI";
  
      public static final String TO_URI_NODEDATANAME = "toURI";
  
      /**
       * Instantiated by the system.
       */
      public VirtualURIManager() {
      }
  
      /**
       * all cached data. <UrlPattern, String[target, pattern]>
       */
      private final List cachedURImapping = new ArrayList();
  
      /**
       * checks for the requested URI mapping in Server config : Servlet Specification 2.3 Section 10 "Mapping Requests to
       * Servlets".
       * 
       * @param uri the URI of the current request, decoded and without the context path
       * @return URI string mapping
       */
      public String getURIMapping(String uri) {
          return getURIMapping(uri, null);   
      }
      
      /**
       * checks for the requested URI mapping in Server config : Servlet Specification 2.3 Section 10 "Mapping Requests to
       * Servlets".
       * 
       * @param uri the URI of the current request, decoded and without the context path
       * @param queryString the Query String of the current request
       * @return URI string mapping
       */
      public String getURIMapping(String uri, String queryString) {
          Iterator e = cachedURImapping.iterator();
          String mappedURI = StringUtils.EMPTY;
          int lastMatchedLevel = 0;
         while (e.hasNext()) {
             try{
                 VirtualURIMapping vm = (VirtualURIMapping) e.next();
                 final VirtualURIMapping.MappingResult result;
                 if (queryString != null && vm instanceof QueryAwareVirtualURIMapping){
                     result = ((QueryAwareVirtualURIMapping)vm).mapURI(uri, queryString);
                 } else {
                     result = vm.mapURI(uri);   
                 }
                 if (result != null && lastMatchedLevel < result.getLevel()) {
                     lastMatchedLevel = result.getLevel();
                     mappedURI = result.getToURI();
                 }
             }catch(ClassCastException ex){
                 log.error("Virtual URI configuration error, mapping rule is skipped: " + ex.getMessage(), ex);
             }
         }
         return mappedURI;
     }
 
     protected void onRegister(Content node) {
         try {
             log.info("Loading VirtualURIMapping from {}", node.getHandle()); //$NON-NLS-1$
             Content2BeanUtil.setProperties(this.cachedURImapping, node, true, new Content2BeanTransformerImpl(){
                 protected TypeDescriptor onResolveType(TransformationState state, TypeDescriptor resolvedType) {
                     if(state.getLevel()==2 && resolvedType == null){
                         return this.getTypeMapping().getTypeDescriptor(DefaultVirtualURIMapping.class);
                     }
                     return resolvedType;
                 }
             });
             log.debug("VirtualURIMapping loaded from {}", node.getHandle()); //$NON-NLS-1$
         }
         catch (Exception e) {
             log.error("Failed to load VirtualURIMapping from " + node.getHandle() + " - " + e.getMessage(), e); //$NON-NLS-1$ //$NON-NLS-2$
         }
     }
 
     protected void onClear() {
         this.cachedURImapping.clear();
     }
 
     // TODO : should this really be public ?
     public Collection getURIMappings() {
         return cachedURImapping;
     }
 
     /**
      * @return Returns the instance.
      */
     public static VirtualURIManager getInstance() {
         return Components.getSingleton(VirtualURIManager.class);
     }
 }