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 */ 017package org.apache.activemq.console.filter; 018 019import java.util.ArrayList; 020import java.util.Iterator; 021import java.util.List; 022 023public abstract class WildcardTransformFilter extends AbstractQueryFilter { 024 025 /** 026 * Creates a wildcard transform filter that is able to convert a wildcard 027 * expression (determined by isWildcardQuery) to a another query type (use 028 * transformWildcardQuery). 029 * 030 * @param next - the next query filter 031 */ 032 protected WildcardTransformFilter(QueryFilter next) { 033 super(next); 034 } 035 036 /** 037 * Converts the query list to set of different queries 038 * 039 * @param queries - query list to transform 040 * @return - result of the query 041 * @throws Exception 042 */ 043 public List query(List queries) throws Exception { 044 List newQueries = new ArrayList(); 045 046 for (Iterator i = queries.iterator(); i.hasNext();) { 047 String queryToken = (String)i.next(); 048 049 // Transform the wildcard query 050 if (isWildcardQuery(queryToken)) { 051 // Transform the value part only 052 newQueries.add(transformWildcardQuery(queryToken)); 053 054 // Maintain the query as is 055 } else { 056 newQueries.add(queryToken); 057 } 058 } 059 060 return next.query(newQueries); 061 } 062 063 /** 064 * Use to determine is a query string is a wildcard query 065 * 066 * @param query - query string 067 * @return true, if the query string is a wildcard query, false otherwise 068 */ 069 protected abstract boolean isWildcardQuery(String query); 070 071 /** 072 * Use to transform a wildcard query string to another query format 073 * 074 * @param query - query string to transform 075 * @return transformed query 076 */ 077 protected abstract String transformWildcardQuery(String query); 078}