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.apache.commons.logging.Log; 025 import org.apache.commons.logging.LogFactory; 026 027 /** 028 * Useful base class 029 * 030 * @version $Revision: $ 031 */ 032 public abstract class DotFileInterceptorSupport extends BrokerFilter { 033 private final Log log = LogFactory.getLog(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 }