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ActiveMQ example source code file (WildcardToMsgSelectorTransformFilter.java)

This example ActiveMQ source code file (WildcardToMsgSelectorTransformFilter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

like, like, string, string, wildcardtomsgselectortransformfilter, wildcardtomsgselectortransformfilter, wildcardtransformfilter, wildcardtransformfilter

The ActiveMQ WildcardToMsgSelectorTransformFilter.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.activemq.console.filter;

public class WildcardToMsgSelectorTransformFilter extends WildcardTransformFilter {
    /**
     * Creates a filter that is able to transform a wildcard query to a message
     * selector format
     * 
     * @param next - next query filter
     */
    public WildcardToMsgSelectorTransformFilter(QueryFilter next) {
        super(next);
    }

    /**
     * Use to determine if a query string is a wildcard query. A query string is
     * a wildcard query if it is a key-value pair with the format <key>=
     * and the value is enclosed in '' and contains '*' and '?'.
     * 
     * @param query - query string
     * @return true, if the query string is a wildcard query, false otherwise
     */
    protected boolean isWildcardQuery(String query) {
        // If the query is a key=value pair
        String key = query;
        String val = "";
        int pos = key.indexOf("=");
        if (pos >= 0) {
            val = key.substring(pos + 1);
        }

        // If the value contains wildcards and is enclose by '
        return val.startsWith("'") && val.endsWith("'") && ((val.indexOf("*") >= 0) || (val.indexOf("?") >= 0));
    }

    /**
     * Transform a wildcard query to message selector format
     * 
     * @param query - query string to transform
     * @return message selector format string
     */
    protected String transformWildcardQuery(String query) {
        // If the query is a key=value pair
        String key = query;
        String val = "";
        int pos = key.indexOf("=");
        if (pos >= 0) {
            val = key.substring(pos + 1);
            key = key.substring(0, pos);
        }

        val = val.replaceAll("[?]", "_");
        val = val.replaceAll("[*]", "%");

        return key + " LIKE " + val;
    }
}

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