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ec1f3444 NR |
1 | package be.nikiroo.utils; |
2 | ||
3 | import java.io.BufferedReader; | |
4 | import java.io.File; | |
5 | import java.io.FileInputStream; | |
6 | import java.io.FileOutputStream; | |
7 | import java.io.FileReader; | |
8 | import java.io.FileWriter; | |
9 | import java.io.IOException; | |
10 | import java.io.InputStream; | |
11 | import java.io.OutputStream; | |
12 | import java.util.stream.Stream; | |
13 | import java.util.zip.ZipEntry; | |
14 | import java.util.zip.ZipOutputStream; | |
15 | ||
16 | /** | |
17 | * This class offer some utilities based around {@link Stream}s. | |
18 | * | |
19 | * @author niki | |
20 | */ | |
21 | public class IOUtils { | |
22 | /** | |
23 | * Write the data to the given {@link File}. | |
24 | * | |
25 | * @param in | |
26 | * the data source | |
27 | * @param target | |
28 | * the target {@link File} | |
29 | * | |
30 | * @throws IOException | |
31 | * in case of I/O error | |
32 | */ | |
33 | public static void write(InputStream in, File target) throws IOException { | |
34 | OutputStream out = new FileOutputStream(target); | |
35 | try { | |
36 | write(in, out); | |
37 | } finally { | |
38 | out.close(); | |
39 | } | |
40 | } | |
41 | ||
42 | /** | |
43 | * Write the data to the given {@link OutputStream}. | |
44 | * | |
45 | * @param in | |
46 | * the data source | |
47 | * @param target | |
48 | * the target {@link OutputStream} | |
49 | * | |
50 | * @throws IOException | |
51 | * in case of I/O error | |
52 | */ | |
53 | public static void write(InputStream in, OutputStream out) | |
54 | throws IOException { | |
55 | byte buffer[] = new byte[4069]; | |
56 | for (int len = 0; (len = in.read(buffer)) > 0;) { | |
57 | out.write(buffer, 0, len); | |
58 | } | |
59 | } | |
60 | ||
61 | /** | |
62 | * Recursively Add a {@link File} (which can thus be a directory, too) to a | |
63 | * {@link ZipOutputStream}. | |
64 | * | |
65 | * @param zip | |
66 | * the stream | |
67 | * @param base | |
68 | * the path to prepend to the ZIP info before the actual | |
69 | * {@link File} path | |
70 | * @param target | |
71 | * the source {@link File} (which can be a directory) | |
72 | * @param targetIsRoot | |
73 | * FALSE if we need to add a {@link ZipEntry} for base/target, | |
74 | * TRUE to add it at the root of the ZIP | |
75 | * | |
76 | * @throws IOException | |
77 | * in case of I/O error | |
78 | */ | |
79 | public static void zip(ZipOutputStream zip, String base, File target, | |
80 | boolean targetIsRoot) throws IOException { | |
81 | if (target.isDirectory()) { | |
82 | if (!targetIsRoot) { | |
83 | if (base == null || base.isEmpty()) { | |
84 | base = target.getName(); | |
85 | } else { | |
86 | base += "/" + target.getName(); | |
87 | } | |
88 | zip.putNextEntry(new ZipEntry(base + "/")); | |
89 | } | |
90 | for (File file : target.listFiles()) { | |
91 | zip(zip, base, file, false); | |
92 | } | |
93 | } else { | |
94 | if (base == null || base.isEmpty()) { | |
95 | base = target.getName(); | |
96 | } else { | |
97 | base += "/" + target.getName(); | |
98 | } | |
99 | zip.putNextEntry(new ZipEntry(base)); | |
100 | FileInputStream in = new FileInputStream(target); | |
101 | try { | |
102 | IOUtils.write(in, zip); | |
103 | } finally { | |
104 | in.close(); | |
105 | } | |
106 | } | |
107 | } | |
108 | ||
109 | /** | |
110 | * Zip the given source into dest. | |
111 | * | |
112 | * @param src | |
113 | * the source {@link File} (which can be a directory) | |
114 | * @param dest | |
115 | * the destination <tt>.zip</tt> file | |
116 | * @param srctIsRoot | |
117 | * FALSE if we need to add a {@link ZipEntry} for src, TRUE to | |
118 | * add it at the root of the ZIP | |
119 | * | |
120 | * @throws IOException | |
121 | * in case of I/O error | |
122 | */ | |
123 | public static void zip(File src, File dest, boolean srcIsRoot) | |
124 | throws IOException { | |
125 | OutputStream out = new FileOutputStream(dest); | |
126 | try { | |
127 | ZipOutputStream zip = new ZipOutputStream(out); | |
128 | try { | |
129 | IOUtils.zip(zip, "", src, srcIsRoot); | |
130 | } finally { | |
131 | zip.close(); | |
132 | } | |
133 | } finally { | |
134 | out.close(); | |
135 | } | |
136 | } | |
137 | ||
138 | /** | |
139 | * Write the {@link String} content to {@link File}. | |
140 | * | |
141 | * @param dir | |
142 | * the directory where to write the {@link File} | |
143 | * @param filename | |
144 | * the {@link File} name | |
145 | * @param content | |
146 | * the content | |
147 | * | |
148 | * @throws IOException | |
149 | * in case of I/O error | |
150 | */ | |
151 | public static void writeSmallFile(File dir, String filename, String content) | |
152 | throws IOException { | |
153 | if (!dir.exists()) { | |
154 | dir.mkdirs(); | |
155 | } | |
156 | ||
157 | FileWriter writerVersion = new FileWriter(new File(dir, filename)); | |
158 | try { | |
159 | writerVersion.write(content); | |
160 | } finally { | |
161 | writerVersion.close(); | |
162 | } | |
163 | } | |
164 | ||
165 | /** | |
166 | * Read the whole {@link File} content into a {@link String}. | |
167 | * | |
168 | * @param file | |
169 | * the {@link File} | |
170 | * | |
171 | * @return the content | |
172 | * | |
173 | * @throws IOException | |
174 | * in case of I/O error | |
175 | */ | |
176 | public static String readSmallFile(File file) throws IOException { | |
177 | BufferedReader reader = new BufferedReader(new FileReader(file)); | |
178 | try { | |
179 | StringBuilder builder = new StringBuilder(); | |
180 | for (String line = reader.readLine(); line != null; line = reader | |
181 | .readLine()) { | |
182 | builder.append(line); | |
183 | } | |
184 | return builder.toString(); | |
185 | } finally { | |
186 | reader.close(); | |
187 | } | |
188 | } | |
189 | ||
190 | /** | |
191 | * Recursively delete the given {@link File}, which may of course also be a | |
192 | * directory. | |
193 | * <p> | |
194 | * Will silently continue in case of error. | |
195 | * | |
196 | * @param target | |
197 | * the target to delete | |
198 | */ | |
199 | public static void deltree(File target) { | |
200 | for (File file : target.listFiles()) { | |
201 | if (file.isDirectory()) { | |
202 | deltree(file); | |
203 | } else { | |
204 | if (!file.delete()) { | |
205 | System.err.println("Cannot delete file: " | |
206 | + file.getAbsolutePath()); | |
207 | } | |
208 | } | |
209 | } | |
210 | ||
211 | if (!target.delete()) { | |
212 | System.err.println("Cannot delete file: " | |
213 | + target.getAbsolutePath()); | |
214 | } | |
215 | } | |
216 | } |