/*
    * 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 queries within the Replication API.
   * 
   * @author <a href="mailto:tcunning@apache.org">Tom Cunningham</a>
   */
  public enum ReplicationQuery implements UDDIQuery {
      GET_CHANGERECORDS("get_changeRecords"),
      NOTIFY_CHANGERECORDSAVAILABLE("notify_changeRecordsAvailable"),
      DO_PING("do_ping"),
      GET_HIGHWATERMARKS("get_highWaterMarks"),
      TRANSFER_CUSTODY("transfer_custody");
      
      private String _query;
      private static Hashtable<String, ReplicationQuery> _replicationQueries = null;
      
      ReplicationQuery(final String query) {
          _query = query;
      }
      
      public String getQuery() {
          return _query;
      }
      
      public synchronized static void initReplicationQueries () {
              if (_replicationQueries == null) {
                  _replicationQueries = new Hashtable();
  
                  _replicationQueries.put(ReplicationQuery.GET_CHANGERECORDS.getQuery(), ReplicationQuery.GET_CHANGERECORDS);
                  _replicationQueries.put(ReplicationQuery.NOTIFY_CHANGERECORDSAVAILABLE.getQuery(), ReplicationQuery.NOTIFY_CHANGERECORDSAVAILABLE);
                  _replicationQueries.put(ReplicationQuery.DO_PING.getQuery(), ReplicationQuery.DO_PING);
                  _replicationQueries.put(ReplicationQuery.GET_HIGHWATERMARKS.getQuery(), ReplicationQuery.GET_HIGHWATERMARKS);
                  _replicationQueries.put(ReplicationQuery.TRANSFER_CUSTODY.getQuery(), ReplicationQuery.TRANSFER_CUSTODY);
              }
      }
  
      public static List<String> getQueries() {
          if (_replicationQueries == null) {
              initReplicationQueries();
          }
          
          List list = new ArrayList<String>(_replicationQueries.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 ReplicationQuery fromQuery(final String query) {
          if (_replicationQueries == null) {
              initReplicationQueries();
          }
          
          if (_replicationQueries.contains(query)) {
              return _replicationQueries.get(query);
          } else {
              throw new IllegalArgumentException("Unrecognized query " + query);
          }        
  
      }
  }