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 java.io.File;
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5 | import java.io.FileInputStream;
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6 | import java.io.FileOutputStream;
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7 | import java.io.IOException;
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8 | import java.io.InputStream;
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9 | import java.io.OutputStream;
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10 | import java.nio.charset.StandardCharsets;
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11 | import java.util.zip.GZIPOutputStream;
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12 | import java.util.zip.ZipOutputStream;
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13 |
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14 | import org.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream;
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15 | import org.openstreetmap.josm.tools.Utils;
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16 |
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17 | /**
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18 | * An enum representing the compression type of a resource.
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19 | */
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20 | public enum Compression {
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21 | /**
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22 | * no compression
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23 | */
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24 | NONE,
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25 | /**
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26 | * bzip2 compression
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27 | */
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28 | BZIP2,
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29 | /**
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30 | * gzip compression
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31 | */
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32 | GZIP,
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33 | /**
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34 | * zip compression
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35 | */
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36 | ZIP;
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37 |
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38 | /**
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39 | * Determines the compression type depending on the suffix of {@code name}.
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40 | * @param name File name including extension
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41 | * @return the compression type
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42 | */
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43 | public static Compression byExtension(String name) {
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44 | return name != null && name.endsWith(".gz")
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45 | ? GZIP
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46 | : name != null && (name.endsWith(".bz2") || name.endsWith(".bz"))
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47 | ? BZIP2
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48 | : name != null && name.endsWith(".zip")
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49 | ? ZIP
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50 | : NONE;
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51 | }
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52 |
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53 | /**
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54 | * Determines the compression type based on the content type (MIME type).
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55 | * @param contentType the content type
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56 | * @return the compression type
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57 | */
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58 | public static Compression forContentType(String contentType) {
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59 | switch (contentType) {
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60 | case "application/zip":
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61 | return ZIP;
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62 | case "application/x-gzip":
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63 | return GZIP;
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64 | case "application/x-bzip2":
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65 | return BZIP2;
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66 | default:
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67 | return NONE;
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68 | }
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69 | }
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70 |
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71 | /**
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72 | * Returns an un-compressing {@link InputStream} for {@code in}.
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73 | * @param in raw input stream
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74 | * @return un-compressing input stream
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75 | *
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76 | * @throws IOException if any I/O error occurs
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77 | */
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78 | public InputStream getUncompressedInputStream(InputStream in) throws IOException {
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79 | switch (this) {
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80 | case BZIP2:
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81 | return Utils.getBZip2InputStream(in);
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82 | case GZIP:
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83 | return Utils.getGZipInputStream(in);
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84 | case ZIP:
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85 | return Utils.getZipInputStream(in);
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86 | case NONE:
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87 | default:
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88 | return in;
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89 | }
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90 | }
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91 |
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92 | /**
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93 | * Returns an un-compressing {@link InputStream} for the {@link File} {@code file}.
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94 | * @param file file
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95 | * @return un-compressing input stream
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96 | * @throws IOException if any I/O error occurs
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97 | */
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98 | public static InputStream getUncompressedFileInputStream(File file) throws IOException {
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99 | FileInputStream in = new FileInputStream(file);
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100 | try {
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101 | return byExtension(file.getName()).getUncompressedInputStream(in);
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102 | } catch (IOException e) {
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103 | Utils.close(in);
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104 | throw e;
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105 | }
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106 | }
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107 |
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108 | /**
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109 | * Returns a compressing {@link OutputStream} for {@code out}.
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110 | * @param out raw output stream
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111 | * @return compressing output stream
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112 | *
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113 | * @throws IOException if any I/O error occurs
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114 | */
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115 | public OutputStream getCompressedOutputStream(OutputStream out) throws IOException {
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116 | switch (this) {
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117 | case BZIP2:
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118 | return new BZip2CompressorOutputStream(out);
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119 | case GZIP:
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120 | return new GZIPOutputStream(out);
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121 | case ZIP:
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122 | return new ZipOutputStream(out, StandardCharsets.UTF_8);
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123 | case NONE:
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124 | default:
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125 | return out;
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126 | }
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127 | }
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128 |
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129 | /**
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130 | * Returns a compressing {@link OutputStream} for the {@link File} {@code file}.
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131 | * @param file file
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132 | * @return compressing output stream
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133 | *
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134 | * @throws IOException if any I/O error occurs
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135 | */
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136 | public static OutputStream getCompressedFileOutputStream(File file) throws IOException {
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137 | FileOutputStream out = new FileOutputStream(file);
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138 | try {
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139 | return byExtension(file.getName()).getCompressedOutputStream(out);
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140 | } catch (IOException e) {
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141 | Utils.close(out);
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142 | throw e;
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143 | }
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144 | }
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145 | }
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