001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.console.filter;
018    
019    public class WildcardToMsgSelectorTransformFilter extends WildcardTransformFilter {
020        /**
021         * Creates a filter that is able to transform a wildcard query to a message
022         * selector format
023         * 
024         * @param next - next query filter
025         */
026        public WildcardToMsgSelectorTransformFilter(QueryFilter next) {
027            super(next);
028        }
029    
030        /**
031         * Use to determine if a query string is a wildcard query. A query string is
032         * a wildcard query if it is a key-value pair with the format <key>=<value>
033         * and the value is enclosed in '' and contains '*' and '?'.
034         * 
035         * @param query - query string
036         * @return true, if the query string is a wildcard query, false otherwise
037         */
038        protected boolean isWildcardQuery(String query) {
039            // If the query is a key=value pair
040            String key = query;
041            String val = "";
042            int pos = key.indexOf("=");
043            if (pos >= 0) {
044                val = key.substring(pos + 1);
045            }
046    
047            // If the value contains wildcards and is enclose by '
048            return val.startsWith("'") && val.endsWith("'") && ((val.indexOf("*") >= 0) || (val.indexOf("?") >= 0));
049        }
050    
051        /**
052         * Transform a wildcard query to message selector format
053         * 
054         * @param query - query string to transform
055         * @return message selector format string
056         */
057        protected String transformWildcardQuery(String query) {
058            // If the query is a key=value pair
059            String key = query;
060            String val = "";
061            int pos = key.indexOf("=");
062            if (pos >= 0) {
063                val = key.substring(pos + 1);
064                key = key.substring(0, pos);
065            }
066    
067            val = val.replaceAll("[?]", "_");
068            val = val.replaceAll("[*]", "%");
069    
070            return key + " LIKE " + val;
071        }
072    }