1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io;
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3 |
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4 | import org.apache.tools.bzip2.CBZip2OutputStream;
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5 | import org.openstreetmap.josm.tools.Utils;
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6 |
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7 | import java.io.File;
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8 | import java.io.FileInputStream;
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9 | import java.io.FileOutputStream;
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10 | import java.io.IOException;
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11 | import java.io.InputStream;
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12 | import java.io.OutputStream;
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13 | import java.net.URL;
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14 | import java.util.zip.GZIPOutputStream;
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15 |
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16 | /**
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17 | * An enum representing the compression type of a resource.
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18 | */
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19 | public enum Compression {
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20 | /**
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21 | * no compression
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22 | */
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23 | NONE,
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24 | /**
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25 | * bzip2 compression
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26 | */
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27 | BZIP2,
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28 | /**
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29 | * gzip compression
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30 | */
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31 | GZIP;
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32 |
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33 | /**
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34 | * Determines the compression type depending on the suffix of {@code name}.
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35 | */
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36 | public static Compression byExtension(String name) {
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37 | return name != null && name.endsWith(".gz")
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38 | ? GZIP
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39 | : name != null && (name.endsWith(".bz2") || name.endsWith(".bz"))
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40 | ? BZIP2
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41 | : NONE;
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42 | }
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43 |
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44 | /**
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45 | * Returns an un-compressing {@link InputStream} for {@code in}.
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46 | *
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47 | * @throws IOException
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48 | */
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49 | public InputStream getUncompressedInputStream(InputStream in) throws IOException {
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50 | switch (this) {
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51 | case BZIP2:
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52 | return FileImporter.getBZip2InputStream(in);
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53 | case GZIP:
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54 | return FileImporter.getGZipInputStream(in);
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55 | case NONE:
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56 | default:
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57 | return in;
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58 | }
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59 | }
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60 |
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61 | /**
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62 | * Returns an un-compressing {@link InputStream} for the {@link File} {@code file}.
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63 | *
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64 | * @throws IOException
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65 | */
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66 | public static InputStream getUncompressedFileInputStream(File file) throws IOException {
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67 | return byExtension(file.getName()).getUncompressedInputStream(new FileInputStream(file));
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68 | }
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69 |
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70 | /**
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71 | * Returns an un-compressing {@link InputStream} for the {@link URL} {@code url}.
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72 | *
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73 | * @throws IOException
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74 | */
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75 | public static InputStream getUncompressedURLInputStream(URL url) throws IOException {
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76 | return Utils.openURLAndDecompress(url, true);
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77 | }
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78 |
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79 | /**
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80 | * Returns a compressing {@link OutputStream} for {@code out}.
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81 | *
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82 | * @throws IOException
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83 | */
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84 | public OutputStream getCompressedOutputStream(OutputStream out) throws IOException {
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85 | switch (this) {
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86 | case BZIP2:
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87 | out.write('B');
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88 | out.write('Z');
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89 | return new CBZip2OutputStream(out);
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90 | case GZIP:
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91 | return new GZIPOutputStream(out);
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92 | case NONE:
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93 | default:
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94 | return out;
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95 | }
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96 | }
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97 |
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98 | /**
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99 | * Returns a compressing {@link OutputStream} for the {@link File} {@code file}.
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100 | *
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101 | * @throws IOException
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102 | */
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103 | public static OutputStream getCompressedFileOutputStream(File file) throws IOException {
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104 | return byExtension(file.getName()).getCompressedOutputStream(new FileOutputStream(file));
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105 | }
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106 | }
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