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ActiveMQ example source code file (WildcardTransformFilter.java)

This example ActiveMQ source code file (WildcardTransformFilter.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

abstractqueryfilter, arraylist, exception, exception, iterator, list, list, string, string, util, wildcardtransformfilter, wildcardtransformfilter

The ActiveMQ WildcardTransformFilter.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;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public abstract class WildcardTransformFilter extends AbstractQueryFilter {

    /**
     * Creates a wildcard transform filter that is able to convert a wildcard
     * expression (determined by isWildcardQuery) to a another query type (use
     * transformWildcardQuery).
     * 
     * @param next - the next query filter
     */
    protected WildcardTransformFilter(QueryFilter next) {
        super(next);
    }

    /**
     * Converts the query list to set of different queries
     * 
     * @param queries - query list to transform
     * @return - result of the query
     * @throws Exception
     */
    public List query(List queries) throws Exception {
        List newQueries = new ArrayList();

        for (Iterator i = queries.iterator(); i.hasNext();) {
            String queryToken = (String)i.next();

            // Transform the wildcard query
            if (isWildcardQuery(queryToken)) {
                // Transform the value part only
                newQueries.add(transformWildcardQuery(queryToken));

                // Maintain the query as is
            } else {
                newQueries.add(queryToken);
            }
        }

        return next.query(newQueries);
    }

    /**
     * Use to determine is a query string is a wildcard query
     * 
     * @param query - query string
     * @return true, if the query string is a wildcard query, false otherwise
     */
    protected abstract boolean isWildcardQuery(String query);

    /**
     * Use to transform a wildcard query string to another query format
     * 
     * @param query - query string to transform
     * @return transformed query
     */
    protected abstract String transformWildcardQuery(String query);
}

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