WildcardTransformFilter


1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one or more
4    * contributor license agreements.  See the NOTICE file distributed with
5    * this work for additional information regarding copyright ownership.
6    * The ASF licenses this file to You under the Apache License, Version 2.0
7    * (the "License"); you may not use this file except in compliance with
8    * the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.activemq.console.filter;
19  
20  import java.util.Iterator  ;
21  import java.util.ArrayList  ;
22  import java.util.List  ;
23  
24  public abstract class WildcardTransformFilter extends AbstractQueryFilter {
25  
26      /**
27       * Creates a wildcard transform filter that is able to convert a wildcard expression (determined by isWildcardQuery)
28       * to a another query type (use transformWildcardQuery).
29       * @param next - the next query filter
30       */
31      protected WildcardTransformFilter(QueryFilter next) {
32          super(next);
33      }
34  
35      /**
36       * Converts the query list to set of different queries
37       * @param queries - query list to transform
38       * @return - result of the query
39       * @throws Exception
40       */
41      public List   query(List   queries) throws Exception   {
42          List   newQueries = new ArrayList  ();
43  
44          for (Iterator   i=queries.iterator(); i.hasNext();) {
45              String   queryToken = (String  )i.next();
46  
47              // Transform the wildcard query
48              if (isWildcardQuery(queryToken)) {
49                  // Transform the value part only
50                  newQueries.add(transformWildcardQuery(queryToken));
51  
52              // Maintain the query as is
53              } else {
54                  newQueries.add(queryToken);
55              }
56          }
57  
58          return next.query(newQueries);
59      }
60  
61      /**
62       * Use to determine is a query string is a wildcard query
63       * @param query - query string
64       * @return true, if the query string is a wildcard query, false otherwise
65       */
66      protected abstract boolean isWildcardQuery(String   query);
67  
68      /**
69       * Use to transform a wildcard query string to another query format
70       * @param query - query string to transform
71       * @return transformed query
72       */
73      protected abstract String   transformWildcardQuery(String   query);
74  }
75
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags