/*
    * 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.chemistry.opencmis.server.shared;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.xml.stream.XMLStreamException;
  
  import org.apache.chemistry.opencmis.commons.exceptions.CmisBaseException;
  import org.apache.chemistry.opencmis.commons.exceptions.CmisInvalidArgumentException;
  import org.apache.chemistry.opencmis.commons.exceptions.CmisRuntimeException;
  import org.apache.chemistry.opencmis.commons.impl.json.parser.JSONParseException;
  import org.apache.chemistry.opencmis.commons.server.CallContext;
  import org.apache.chemistry.opencmis.commons.server.CmisService;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Dispatcher for the AtomPub and Browser binding servlet.
   */
  public class Dispatcher implements Serializable {
  
      private static final long serialVersionUID = 1L;
  
      public static final String BASE_URL_ATTRIBUTE = "org.apache.chemistry.opencmis.baseurl";
  
      public static final String METHOD_GET = "GET";
      public static final String METHOD_HEAD = "HEAD";
      public static final String METHOD_POST = "POST";
      public static final String METHOD_PUT = "PUT";
      public static final String METHOD_DELETE = "DELETE";
  
      private static final Logger LOG = LoggerFactory.getLogger(Dispatcher.class.getName());
  
      private final boolean caseSensitive;
      private final Map<String, ServiceCall> serviceCallMap;
  
      public Dispatcher() {
          this(true);
      }
  
      public Dispatcher(boolean caseSensitive) {
          this.caseSensitive = caseSensitive;
          serviceCallMap = new HashMap<String, ServiceCall>();
      }
  
      /**
       * Connects a resource and HTTP method with an object that handles the call.
       */
      public void addResource(String resource, String httpMethod, ServiceCall serviceCall) {
          serviceCallMap.put(getKey(resource, httpMethod), serviceCall);
      }
  
      /**
       * Handles the a call.
       * 
       * @return <code>true</code> if an object was found that can handle the
       *         request, <code>false</code> otherwise.
       */
      public boolean dispatch(String resource, String httpMethod, CallContext context, CmisService service,
              String repositoryId, HttpServletRequest request, HttpServletResponse response) {
          ServiceCall serviceCall = serviceCallMap.get(getKey(resource, httpMethod));
          if (serviceCall == null) {
              return false;
          }
  
          if (LOG.isDebugEnabled()) {
              LOG.debug(repositoryId + " / " + resource + ", " + httpMethod + " -> " + serviceCall.getClass().getName());
          }
  
          try {
              serviceCall.serve(context, service, repositoryId, request, response);
          } catch (CmisBaseException ce) {
              throw ce;
          } catch (XMLStreamException xse) {
              throw new CmisInvalidArgumentException("Invalid XML!", xse);
          } catch (JSONParseException jpe) {
              throw new CmisInvalidArgumentException("Invalid JSON!", jpe);
          } catch (Exception e) {
             throw new CmisRuntimeException(e.getMessage(), e);
         }
 
         return true;
     }
 
     /**
      * Generates a map key from a resource and an HTTP method.
      */
     private String getKey(String resource, String httpMethod) {
         String s = resource + "/" + httpMethod;
         return (caseSensitive ? s : s.toUpperCase());
     }
 }