BinaryPassThroughContentTransformer


1   /*
2    * Copyright (C) 2005 Alfresco, Inc.
3    *
4    * Licensed under the Mozilla Public License version 1.1 
5    * with a permitted attribution clause. You may obtain a
6    * copy of the License at
7    *
8    *   http://www.alfresco.org/legal/license.txt
9    *
10   * Unless required by applicable law or agreed to in writing,
11   * software distributed under the License is distributed on an
12   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
13   * either express or implied. See the License for the specific
14   * language governing permissions and limitations under the
15   * License.
16   */
17  package org.alfresco.repo.content.transform;
18  
19  import java.util.Map  ;
20  
21  import org.alfresco.service.cmr.repository.ContentReader;
22  import org.alfresco.service.cmr.repository.ContentWriter;
23  import org.apache.commons.logging.Log;
24  import org.apache.commons.logging.LogFactory;
25  
26  /**
27   * Allows direct streaming from source to target when the respective mimetypes
28   * are identical, except where the mimetype is text.
29   * <p>
30   * Text has to be transformed based on the encoding even if the mimetypes don't
31   * reflect it. 
32   * 
33   * @see org.alfresco.repo.content.transform.StringExtractingContentTransformer
34   * 
35   * @author Derek Hulley
36   */
37  public class BinaryPassThroughContentTransformer extends AbstractContentTransformer
38  {
39      private static final Log logger = LogFactory.getLog(BinaryPassThroughContentTransformer.class);
40      
41      /**
42       * @return Returns 1.0 if the formats are identical and not text
43       */
44      public double getReliability(String   sourceMimetype, String   targetMimetype)
45      {
46          if (sourceMimetype.startsWith(StringExtractingContentTransformer.PREFIX_TEXT))
47          {
48              // we can only stream binary content through
49              return 0.0;
50          }
51          else if (!sourceMimetype.equals(targetMimetype))
52          {
53              // no transformation is possible so formats must be exact
54              return 0.0;
55          }
56          else
57          {
58              // formats are the same and are not text
59              return 1.0;
60          }
61      }
62  
63      /**
64       * Performs a direct stream provided the preconditions are met
65       */
66      public void transformInternal(
67              ContentReader reader,
68              ContentWriter writer,
69              Map  <String  , Object  > options) throws Exception  
70      {
71          // just stream it
72          writer.putContent(reader.getContentInputStream());
73      }
74  }
75
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