| 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 | } |