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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.transport.file.transformers;
8   
9   import org.mule.api.transformer.TransformerException;
10  import org.mule.transformer.types.DataTypeFactory;
11  
12  import java.io.File;
13  import java.io.UnsupportedEncodingException;
14  
15  /**
16   * <code>FileToString</code> reads file contents into a string.
17   */
18  public class FileToString extends FileToByteArray
19  {
20  
21      public FileToString()
22      {
23          registerSourceType(DataTypeFactory.create(File.class));
24          registerSourceType(DataTypeFactory.INPUT_STREAM);
25          registerSourceType(DataTypeFactory.BYTE_ARRAY);
26          setReturnDataType(DataTypeFactory.STRING);
27      }
28  
29      /**
30       * Simple implementation which relies on {@link FileToByteArray} to get a
31       * <code>byte[]</code> from the file beeing parsed and then transform it to a
32       * String with the correct encoding. If the encoding isn't supported simply throw
33       * an exception, good tranformation or no transformation at all. NOTE: if a
34       * <code>byte[]</code> is passed in as a source object this transformer accepts
35       * it and tries the usual transformation.
36       */
37      @Override
38      public Object doTransform(Object src, String encoding) throws TransformerException
39      {
40          byte[] bytes;
41  
42          if (src instanceof byte[])
43          {
44              bytes = (byte[])src;
45          }
46          else
47          {
48              bytes = (byte[]) super.doTransform(src, encoding);
49          }
50  
51          try
52          {
53              return new String(bytes, encoding);
54          }
55          catch (UnsupportedEncodingException uee)
56          {
57              throw new TransformerException(this, uee);
58          }
59      }
60  
61  }