DotFileInterceptorSupport


1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.activemq.broker.view;
18  
19  import org.apache.activemq.broker.Broker;
20  import org.apache.activemq.broker.BrokerFilter;
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  
24  import java.io.FileWriter  ;
25  import java.io.PrintWriter  ;
26  
27  /**
28   * Useful base class
29   * 
30   * @version $Revision: $
31   */
32  public abstract class DotFileInterceptorSupport extends BrokerFilter {
33      private final Log log = LogFactory.getLog(DotFileInterceptorSupport.class);
34  
35      private String   file;
36  
37      public DotFileInterceptorSupport(Broker next, String   file) {
38          super(next);
39          this.file = file;
40      }
41  
42      protected void generateFile() throws Exception   {
43          if (log.isDebugEnabled()) {
44              log.debug("Creating DOT file at: " + file);
45          }
46          PrintWriter   writer = new PrintWriter  (new FileWriter  (file));
47          try {
48              generateFile(writer);
49          }
50          finally {
51              writer.close();
52          }
53      }
54  
55      protected abstract void generateFile(PrintWriter   writer) throws Exception  ;
56  }
57
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