/*
    * Copyright 2001-2008 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 org.apache.juddi.api.util;
  
  import java.util.ArrayList;
  import java.util.Hashtable;
  import java.util.List;
  
  /**
   * Enum to represent the methods within the Subscription API.
   * 
   * @author <a href="mailto:tcunning@apache.org">Tom Cunningham</a>
   */
  public enum SubscriptionQuery implements UDDIQuery {
      DELETE_SUBSCRIPTION("delete_subscription"),
      GET_SUBSCRIPTIONRESULTS("get_subscriptionResults"),
      GET_SUBSCRIPTIONS("get_subscriptions"),
      SAVE_SUBSCRIPTION("save_subscription");
          
      private String _query;
      private static Hashtable<String, SubscriptionQuery> _subscriptionQueries = null;
          
      SubscriptionQuery(final String query) {
          _query = query;
      }
          
      public String getQuery() {
          return _query;
      }
          
      public synchronized static void initSubscriptionQueries () {
          if (_subscriptionQueries == null) {
                  _subscriptionQueries = new Hashtable();
  
                  _subscriptionQueries.put(SubscriptionQuery.DELETE_SUBSCRIPTION.getQuery(), SubscriptionQuery.DELETE_SUBSCRIPTION);
                  _subscriptionQueries.put(SubscriptionQuery.GET_SUBSCRIPTIONRESULTS.getQuery(), SubscriptionQuery.GET_SUBSCRIPTIONRESULTS);
                  _subscriptionQueries.put(SubscriptionQuery.GET_SUBSCRIPTIONS.getQuery(), SubscriptionQuery.GET_SUBSCRIPTIONS);
                  _subscriptionQueries.put(SubscriptionQuery.SAVE_SUBSCRIPTION.getQuery(), SubscriptionQuery.SAVE_SUBSCRIPTION);
          }
      }
      
      public static List<String> getQueries() {
          if (_subscriptionQueries == null) {
              initSubscriptionQueries();
          }
          
          List list = new ArrayList<String>(_subscriptionQueries.keySet());
          return list;
      }
  
      /**
       * this doesn't appear to be used anywhere and will be removed in a future version
       * @param query
       * @return
       * @deprecated
       */
      public static SubscriptionQuery fromQuery(final String query) {
          if (_subscriptionQueries == null) {
              initSubscriptionQueries();
          }
          
          if (_subscriptionQueries.contains(query)) {
              return _subscriptionQueries.get(query);
          } else {
              throw new IllegalArgumentException("Unrecognized query " + query);
          }       
      }
  }