1 | package org.hathitrust;
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2 |
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3 | import java.io.BufferedInputStream;
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4 | import java.io.BufferedOutputStream;
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5 | import java.io.BufferedReader;
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6 | import java.io.BufferedWriter;
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7 | import java.io.FileOutputStream;
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8 | import java.io.IOException;
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9 | import java.io.InputStreamReader;
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10 | import java.io.OutputStreamWriter;
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11 | import java.net.URI;
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12 | import java.net.URISyntaxException;
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13 |
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14 | import org.apache.commons.compress.compressors.CompressorException;
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15 | import org.apache.commons.compress.compressors.CompressorInputStream;
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16 | import org.apache.commons.compress.compressors.CompressorOutputStream;
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17 | import org.apache.commons.compress.compressors.CompressorStreamFactory;
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18 | import org.apache.hadoop.conf.Configuration;
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19 | import org.apache.hadoop.fs.FSDataInputStream;
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20 | import org.apache.hadoop.fs.FSDataOutputStream;
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21 | import org.apache.hadoop.fs.FileSystem;
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22 | import org.apache.hadoop.fs.Path;
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23 |
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24 | public class ClusterFileIO {
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25 |
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26 | private static FileSystem __fs = null;
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27 |
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28 | /*
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29 | public static void initOLD(JavaSparkContext java_spark_context)
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30 | {
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31 | try {
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32 | Configuration hadoop_conf = java_spark_context.hadoopConfiguration();
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33 | _fs = FileSystem.get(hadoop_conf);
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34 | }
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35 | catch (IOException e) {
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36 | e.printStackTrace();
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37 | }
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38 | }
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39 | */
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40 |
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41 | /*
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42 | public static void init(String input_dir)
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43 | {
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44 | try {
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45 | Configuration conf = new Configuration();
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46 | URI uri = new URI(input_dir);
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47 | _fs = FileSystem.get(uri, conf);
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48 | }
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49 | catch (URISyntaxException e) {
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50 | e.printStackTrace();
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51 | }
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52 | catch (IOException e) {
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53 | e.printStackTrace();
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54 | }
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55 |
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56 | }
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57 | */
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58 |
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59 | protected static FileSystem getFileSystemInstance(String input_dir)
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60 | {
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61 | if (__fs == null) {
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62 |
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63 | try {
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64 | Configuration conf = new Configuration();
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65 | URI uri = new URI(input_dir);
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66 | __fs = FileSystem.get(uri, conf);
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67 | }
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68 | catch (URISyntaxException e) {
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69 | e.printStackTrace();
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70 | }
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71 | catch (IOException e) {
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72 | e.printStackTrace();
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73 | }
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74 | }
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75 | return __fs;
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76 | }
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77 |
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78 | public static boolean isHDFS(String fileIn)
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79 | {
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80 | return fileIn.startsWith("hdfs://");
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81 | }
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82 |
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83 | public static boolean exists(String file)
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84 | {
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85 | FileSystem fs = getFileSystemInstance(file);
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86 |
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87 | //Configuration conf = jsc.hadoopConfiguration();
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88 | //FileSystem fs = org.apache.hadoop.fs.FileSystem.get(conf);
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89 | boolean exists = false;
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90 |
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91 | try {
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92 | exists = fs.exists(new Path(file));
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93 | } catch (IllegalArgumentException e) {
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94 | exists = false;
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95 | } catch (IOException e) {
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96 | exists = false;
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97 | }
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98 |
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99 | return exists;
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100 | }
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101 |
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102 | public static String removeSuffix(String file,String suffix)
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103 | {
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104 | return file.substring(0,file.length() - suffix.length());
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105 | }
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106 |
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107 | public static boolean createDirectoryAll(String dir)
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108 | {
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109 | FileSystem fs = getFileSystemInstance(dir);
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110 | boolean created_dir = false;
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111 |
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112 | if (!exists(dir)) {
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113 | try {
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114 | URI uri = new URI(dir);
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115 | Path path = new Path(uri);
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116 | fs.mkdirs(path);
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117 | created_dir = true;
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118 | } catch (URISyntaxException e) {
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119 | e.printStackTrace();
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120 | } catch (IOException e) {
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121 | e.printStackTrace();
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122 | }
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123 | }
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124 |
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125 | return created_dir;
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126 | }
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127 |
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128 | public static BufferedInputStream getBufferedInputStream(String fileIn)
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129 | throws IOException
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130 | {
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131 | FileSystem fs = getFileSystemInstance(fileIn);
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132 |
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133 | BufferedInputStream bis = null;
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134 |
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135 | if (isHDFS(fileIn)) {
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136 | URI uri = URI.create (fileIn);
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137 | //Configuration conf = new Configuration();
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138 | //FileSystem file = FileSystem.get(uri, conf);
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139 | //FSDataInputStream fin = file.open(new Path(uri));
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140 |
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141 | //FSDataInputStream fin = _fs.open(new Path(fileIn));
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142 | FSDataInputStream fin = fs.open(new Path(uri));
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143 |
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144 | bis = new BufferedInputStream(fin);
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145 | }
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146 | else {
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147 | /*
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148 | // Trim 'file://' off the front
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149 | String local_file_in = fileIn;
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150 | if (local_file_in.startsWith("file://")) {
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151 | local_file_in = fileIn.substring("file://".length());
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152 | }
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153 | FileInputStream fin = new FileInputStream(local_file_in);
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154 | bis = new BufferedInputStream(fin);
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155 | */
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156 |
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157 | FSDataInputStream fin = fs.open(new Path(fileIn));
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158 |
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159 | bis = new BufferedInputStream(fin);
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160 | }
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161 |
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162 | return bis;
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163 | }
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164 |
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165 | public static BufferedOutputStream getBufferedOutputStream(String fileOut)
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166 | throws IOException
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167 | {
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168 | BufferedOutputStream bos = null;
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169 |
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170 | if (fileOut.startsWith("hdfs://")) {
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171 | URI uri = URI.create (fileOut);
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172 | Configuration conf = new Configuration();
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173 | FileSystem file = FileSystem.get(uri, conf);
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174 | FSDataOutputStream fout = file.create(new Path(uri));
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175 |
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176 | bos = new BufferedOutputStream(fout);
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177 | }
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178 | else {
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179 | // Trim 'file://' off the front
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180 | String local_file_out = fileOut;
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181 | if (local_file_out.startsWith("file://")) {
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182 | local_file_out = fileOut.substring("file://".length());
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183 | }
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184 | FileOutputStream fout = new FileOutputStream(local_file_out);
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185 | bos = new BufferedOutputStream(fout);
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186 | }
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187 |
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188 | return bos;
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189 | }
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190 |
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191 | public static BufferedReader getBufferedReaderForCompressedFile(String fileIn)
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192 | throws IOException, CompressorException
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193 | {
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194 | BufferedInputStream bis = getBufferedInputStream(fileIn);
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195 | CompressorInputStream cis = new CompressorStreamFactory().createCompressorInputStream(bis);
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196 | BufferedReader br = new BufferedReader(new InputStreamReader(cis,"UTF8"));
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197 | return br;
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198 | }
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199 |
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200 | public static BufferedWriter getBufferedWriterForCompressedFile(String fileOut)
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201 | throws IOException, CompressorException
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202 | {
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203 | BufferedOutputStream bos = getBufferedOutputStream(fileOut);
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204 | CompressorStreamFactory csf = new CompressorStreamFactory();
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205 | CompressorOutputStream cos = csf.createCompressorOutputStream(CompressorStreamFactory.BZIP2,bos);
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206 | BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(cos,"UTF8"));
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207 | return bw;
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208 | }
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209 |
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210 | }
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