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1   /*****************************************************************
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
4    * distributed with this work for additional information        *
5    * regarding copyright ownership.  The ASF licenses this file   *
6    * to you under the Apache License, Version 2.0 (the            *
7    * "License"); you may not use this file except in compliance   *
8    * with the License.  You may obtain a copy of the License at   *
9    *                                                              *
10   *   http://www.apache.org/licenses/LICENSE-2.0                 *
11   *                                                              *
12   * Unless required by applicable law or agreed to in writing,   *
13   * software distributed under the License is distributed on an  *
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15   * KIND, either express or implied.  See the License for the    *
16   * specific language governing permissions and limitations      *
17   * under the License.                                           *
18   ****************************************************************/
19  
20  package org.apache.james.mailrepository;
21  
22  import org.apache.avalon.cornerstone.services.store.StreamRepository;
23  import org.apache.james.core.MimeMessageSource;
24  
25  import java.io.IOException;
26  import java.io.InputStream;
27  
28  public class MimeMessageAvalonSource extends MimeMessageSource {
29  
30      //Define how to get to the data
31      
32      /***
33       * The stream repository used by this data source.
34       */
35      StreamRepository sr = null;
36  
37      /***
38       * The name of the repository
39       */
40      String repositoryName = null;
41  
42      /***
43       * The key for the particular stream in the stream repository
44       * to be used by this data source.
45       */
46      String key = null;
47  
48      private long size = -1;
49  
50      public MimeMessageAvalonSource(StreamRepository sr, String repositoryName, String key) {
51          this.sr = sr;
52          this.repositoryName = repositoryName;
53          this.key = key;
54      }
55  
56      /***
57       * Returns a unique String ID that represents the location from where 
58       * this source is loaded.  This will be used to identify where the data 
59       * is, primarily to avoid situations where this data would get overwritten.
60       *
61       * @return the String ID
62       */
63      public String getSourceId() {
64          StringBuffer sourceIdBuffer =
65              new StringBuffer(128)
66                      .append(repositoryName)
67                      .append("/")
68                      .append(key);
69          return sourceIdBuffer.toString();
70      }
71  
72      public InputStream getInputStream() throws IOException {
73          return sr.get(key);
74      }
75  
76      public long getMessageSize() throws IOException {
77          if (size == -1) {
78              if (sr instanceof org.apache.james.mailrepository.filepair.File_Persistent_Stream_Repository) {
79                  size = ((org.apache.james.mailrepository.filepair.File_Persistent_Stream_Repository) sr).getSize(key);
80              } else size = super.getMessageSize();
81          }
82          return size;
83      }
84  }