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1   /*
2    * Copyright (c) 2012-2022, jcabi.com
3    * All rights reserved.
4    *
5    * Redistribution and use in source and binary forms, with or without
6    * modification, are permitted provided that the following conditions
7    * are met: 1) Redistributions of source code must retain the above
8    * copyright notice, this list of conditions and the following
9    * disclaimer. 2) Redistributions in binary form must reproduce the above
10   * copyright notice, this list of conditions and the following
11   * disclaimer in the documentation and/or other materials provided
12   * with the distribution. 3) Neither the name of the jcabi.com nor
13   * the names of its contributors may be used to endorse or promote
14   * products derived from this software without specific prior written
15   * permission.
16   *
17   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
19   * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21   * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
22   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
28   * OF THE POSSIBILITY OF SUCH DAMAGE.
29   */
30  package com.jcabi.xml;
31  
32  import java.io.InputStream;
33  import javax.xml.transform.Source;
34  import javax.xml.transform.TransformerException;
35  import javax.xml.transform.stream.StreamSource;
36  import lombok.EqualsAndHashCode;
37  
38  /**
39   * Sources in classpath.
40   * @since 0.9
41   */
42  @EqualsAndHashCode(of = "prefix")
43  public final class ClasspathSources implements Sources {
44  
45      /**
46       * Pattern to compose resource.
47       */
48      private static final String PATTERN = "%s%s";
49  
50      /**
51       * Prefix.
52       */
53      private final transient String prefix;
54  
55      /**
56       * Public ctor.
57       */
58      public ClasspathSources() {
59          this("");
60      }
61  
62      /**
63       * Public ctor.
64       * @param type Start with this type
65       */
66      public ClasspathSources(final Class<?> type) {
67          this(
68              String.format(
69                  "/%s/",
70                  type.getPackage().getName().replace(".", "/")
71              )
72          );
73      }
74  
75      /**
76       * Public ctor.
77       * @param pfx Classpath prefix
78       */
79      public ClasspathSources(final String pfx) {
80          this.prefix = pfx;
81      }
82  
83      @Override
84      public Source resolve(final String href, final String base)
85          throws TransformerException {
86          InputStream stream = this.getClass().getResourceAsStream(
87              String.format(ClasspathSources.PATTERN, this.prefix, href)
88          );
89          if (stream == null) {
90              stream = this.getClass().getResourceAsStream(
91                  String.format(ClasspathSources.PATTERN, base, href)
92              );
93              if (stream == null) {
94                  throw new TransformerException(
95                      String.format(
96                          "Resource \"%s\" not found in classpath with prefix \"%s\" and base \"%s\"",
97                          href, this.prefix, base
98                      )
99                  );
100             }
101         }
102         return new StreamSource(stream);
103     }
104 }