content: /*
   * Copyright 1999,2004 The Apache Software Foundation.
   *
   * Licensed 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 net.sf.webdav.methods;
  
  import net.sf.webdav.StoredObject;
  
  public abstract class DeterminableMethod extends AbstractMethod {
  
      private static final String NULL_RESOURCE_METHODS_ALLOWED = "OPTIONS, MKCOL, PUT, PROPFIND, LOCK, UNLOCK";
  
      private static final String RESOURCE_METHODS_ALLOWED = "OPTIONS, GET, HEAD, POST, DELETE, TRACE"
              + ", PROPPATCH, COPY, MOVE, LOCK, UNLOCK, PROPFIND";
  
      private static final String FOLDER_METHOD_ALLOWED = ", PUT";
  
      private static final String LESS_ALLOWED_METHODS = "OPTIONS, MKCOL, PUT";
  
      /**
       * Determines the methods normally allowed for the resource.
       * 
       * @param so
       *      StoredObject representing the resource
       * @return all allowed methods, separated by commas
       */
      protected static String determineMethodsAllowed(StoredObject so) {
  
          try {
              if (so != null) {
                  if (so.isNullResource()) {
  
                      return NULL_RESOURCE_METHODS_ALLOWED;
  
                  } else if (so.isFolder()) {
                      return RESOURCE_METHODS_ALLOWED + FOLDER_METHOD_ALLOWED;
                  }
                  // else resource
                  return RESOURCE_METHODS_ALLOWED;
              }
          } catch (Exception e) {
              // we do nothing, just return less allowed methods
          }
  
          return LESS_ALLOWED_METHODS;
      }
  }
  