WildcardToMsgSelectorTransformFilter


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  public class WildcardToMsgSelectorTransformFilter extends WildcardTransformFilter{
21      /**
22       * Creates a filter that is able to transform a wildcard query to a message selector format
23       * @param next - next query filter
24       */
25      public WildcardToMsgSelectorTransformFilter(QueryFilter next) {
26          super(next);
27      }
28  
29      /**
30       * Use to determine if a query string is a wildcard query. A query string is a wildcard query if it is a key-value
31       * pair with the format <key>=<value> and the value is enclosed in '' and contains '*' and '?'.
32       * @param query - query string
33       * @return true, if the query string is a wildcard query, false otherwise
34       */
35      protected boolean isWildcardQuery(String   query) {
36          // If the query is a key=value pair
37          String   key = query;
38          String   val = "";
39          int pos = key.indexOf("=");
40          if (pos >= 0) {
41              val = key.substring(pos + 1);
42              key = key.substring(0, pos);
43          }
44  
45          // If the value contains wildcards and is enclose by '
46          return val.startsWith("'") && val.endsWith("'") && ((val.indexOf("*") >= 0) || (val.indexOf("?") >= 0));
47      }
48  
49      /**
50       * Transform a wildcard query to message selector format
51       * @param query - query string to transform
52       * @return message selector format string
53       */
54      protected String   transformWildcardQuery(String   query) {
55          // If the query is a key=value pair
56          String   key = query;
57          String   val = "";
58          int pos = key.indexOf("=");
59          if (pos >= 0) {
60              val = key.substring(pos + 1);
61              key = key.substring(0, pos);
62          }
63  
64          val = val.replaceAll("[?]", "_");
65          val = val.replaceAll("[*]", "%");
66  
67          return key + " LIKE " + val;
68      }
69  }
70
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