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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.config.spring.util;
8   
9   import org.mule.util.IOUtils;
10  
11  import java.io.ByteArrayInputStream;
12  import java.io.IOException;
13  import java.io.InputStream;
14  import java.io.Reader;
15  import java.io.UnsupportedEncodingException;
16  
17  import org.springframework.core.io.AbstractResource;
18  
19  /**
20   * Spring 2.x is picky about open/closed input streams, as it requires a closed
21   * stream (fully read resource) to enable automatic validation detection (DTD or
22   * XSD). Otherwise, a caller has to specify the mode explicitly. <p/> Code relying on
23   * Spring 1.2.x behavior may now break with
24   * {@link org.springframework.beans.factory.BeanDefinitionStoreException}. This
25   * class is called in to remedy this and should be used instead of, e.g.
26   * {@link org.springframework.core.io.InputStreamResource}. <p/> The resource is
27   * fully stored in memory.
28   */
29  public class CachedResource extends AbstractResource
30  {
31  
32      private static final String DEFAULT_DESCRIPTION = "cached in-memory resource";
33  
34      private final byte[] buffer;
35      private final String description;
36  
37      public CachedResource(byte[] source)
38      {
39          this(source, null);
40      }
41  
42      public CachedResource(String source, String encoding) throws UnsupportedEncodingException
43      {
44          this(source.trim().getBytes(encoding), DEFAULT_DESCRIPTION);
45      }
46  
47      public CachedResource(byte[] source, String description)
48      {
49          this.buffer = source;
50          this.description = description;
51      }
52  
53      public CachedResource(Reader reader, String encoding) throws IOException
54      {
55          this(IOUtils.toByteArray(reader, encoding), DEFAULT_DESCRIPTION);
56      }
57  
58      public String getDescription()
59      {
60          return (description == null) ? "" : description;
61      }
62  
63      public InputStream getInputStream() throws IOException
64      {
65          // This HAS to be a new InputStream, otherwise SAX
66          // parser breaks with 'Premature end of file at line -1"
67          // This behavior is not observed with Spring pre-2.x
68          return new ByteArrayInputStream(buffer);
69      }
70  }