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.broker.view;
018    
019    import java.io.FileWriter;
020    import java.io.PrintWriter;
021    
022    import org.apache.activemq.broker.Broker;
023    import org.apache.activemq.broker.BrokerFilter;
024    import org.slf4j.Logger;
025    import org.slf4j.LoggerFactory;
026    
027    /**
028     * Useful base class
029     * 
030     * 
031     */
032    public abstract class DotFileInterceptorSupport extends BrokerFilter {
033        private final Logger log = LoggerFactory.getLogger(DotFileInterceptorSupport.class);
034    
035        private String file;
036    
037        public DotFileInterceptorSupport(Broker next, String file) {
038            super(next);
039            this.file = file;
040        }
041    
042        protected void generateFile() throws Exception {
043            if (log.isDebugEnabled()) {
044                log.debug("Creating DOT file at: " + file);
045            }
046            PrintWriter writer = new PrintWriter(new FileWriter(file));
047            try {
048                generateFile(writer);
049            } finally {
050                writer.close();
051            }
052        }
053    
054        protected abstract void generateFile(PrintWriter writer) throws Exception;
055    }