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.File;
33 import java.io.FileInputStream;
34 import java.io.FileNotFoundException;
35 import java.io.IOException;
36 import java.nio.file.Files;
37 import javax.xml.transform.Source;
38 import javax.xml.transform.TransformerException;
39 import javax.xml.transform.stream.StreamSource;
40 import lombok.EqualsAndHashCode;
41
42 /**
43 * Sources in file system.
44 *
45 * If you have some resources in files, just configure your
46 * XSL with this "sources":
47 *
48 * <pre> XSL xsl = new XSLDocument(input).with(
49 * new FileSources("/tmp/my-resources")
50 * );</pre>
51 *
52 * @since 0.18
53 */
54 @EqualsAndHashCode(of = "path")
55 public final class FileSources implements Sources {
56
57 /**
58 * Directory.
59 */
60 private final transient File path;
61
62 /**
63 * Public ctor.
64 */
65 public FileSources() {
66 this("");
67 }
68
69 /**
70 * Public ctor.
71 * @param dir Directory
72 */
73 public FileSources(final String dir) {
74 this(new File(dir));
75 }
76
77 /**
78 * Public ctor.
79 * @param dir Directory
80 */
81 public FileSources(final File dir) {
82 this.path = dir;
83 }
84
85 @Override
86 public Source resolve(final String href, final String base)
87 throws TransformerException {
88 File file = new File(this.path, href);
89 if (!file.exists()) {
90 if (base == null) {
91 file = new File(href);
92 } else {
93 file = new File(new File(base), href);
94 }
95 if (!file.exists()) {
96 throw new TransformerException(
97 String.format(
98 "File \"%s\" not found in \"%s\" and in base \"%s\"",
99 href, this.path, base
100 )
101 );
102 }
103 }
104 try {
105 return new StreamSource(Files.newInputStream(file.toPath()));
106 } catch (final IOException ex) {
107 throw new TransformerException(
108 String.format("Can't read from file '%s'", file),
109 ex
110 );
111 }
112 }
113 }