1 | package org.hathitrust;
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2 |
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3 | import java.io.BufferedReader;
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4 | import java.util.ArrayList;
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5 | import java.util.Iterator;
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6 |
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7 | import org.apache.spark.api.java.function.FlatMapFunction;
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8 | import org.json.JSONArray;
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9 | import org.json.JSONObject;
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10 |
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11 | /*
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12 | class PagedJSON implements Function<String, Boolean> {
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13 |
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14 | private static final long serialVersionUID = 1L;
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15 |
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16 | public Boolean call(String s) { return s.contains("a"); }
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17 | }
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18 | */
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19 |
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20 |
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21 | class PagedJSON implements FlatMapFunction<String, String>
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22 | {
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23 | private static final long serialVersionUID = 1L;
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24 |
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25 | protected String _input_dir;
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26 |
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27 | public PagedJSON(String input_dir)
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28 | {
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29 | _input_dir = input_dir;
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30 | }
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31 |
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32 | protected JSONObject readJSONFile(String filename)
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33 | {
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34 | //Path path = Paths.get(filename);
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35 |
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36 | StringBuilder sb = new StringBuilder();
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37 |
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38 | try {
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39 |
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40 | String str;
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41 | BufferedReader br = ClusterFileIO.getBufferedReaderForCompressedFile(_input_dir + "/" + filename);
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42 | while ((str = br.readLine()) != null) {
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43 | sb.append(str);
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44 | //System.out.println(str);
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45 | }
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46 |
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47 | br.close();
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48 |
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49 | //System.err.println("*****" + sb.toString());
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50 |
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51 | /*
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52 | List<String> lines = Files.readAllLines(path,StandardCharsets.UTF_8);
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53 |
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54 |
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55 | for (String line : lines) {
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56 | sb.append(line);
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57 |
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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 | catch (Exception e) {
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63 | e.printStackTrace();
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64 | }
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65 |
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66 | JSONObject json_obj = new JSONObject(sb.toString());
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67 |
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68 |
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69 | return json_obj;
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70 |
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71 | //return sb.toString();
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72 | }
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73 |
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74 | public Iterator<String> call(String json_file_in)
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75 | {
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76 | JSONObject extracted_feature_record = readJSONFile(json_file_in);
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77 |
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78 | // Check output directory for volume exists, and create it if not
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79 |
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80 |
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81 | String id = extracted_feature_record.getString("id");
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82 |
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83 | JSONObject ef_metadata = extracted_feature_record.getJSONObject("metadata");
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84 | JSONObject ef_features = extracted_feature_record.getJSONObject("features");
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85 |
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86 |
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87 | int ef_page_count = ef_features.getInt("pageCount");
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88 |
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89 | JSONArray ef_pages = ef_features.getJSONArray("pages");
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90 | int ef_num_pages = ef_pages.length();
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91 |
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92 | ArrayList<String> ids = new ArrayList<String>(ef_num_pages);
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93 | for (int i = 0; i < ef_page_count; i++) {
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94 | ids.add(id + "." + i);
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95 | }
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96 |
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97 | /*
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98 | for (int i = 0; i < ef_num_pages; i++)
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99 | {
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100 | //String post_id = ef_pages.getJSONObject(i).getString("post_id");
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101 | //......
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102 | }
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103 | */
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104 | //String pageName = json_obj.getJSONObject("pageInfo").getString("pageName");
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105 | /*
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106 | JSONArray arr = obj.getJSONArray("posts");
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107 | for (int i = 0; i < arr.length(); i++)
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108 | {
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109 | String post_id = arr.getJSONObject(i).getString("post_id");
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110 | ......
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111 | }
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112 | */
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113 |
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114 |
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115 | ids.add(id);
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116 |
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117 | return ids.iterator();
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118 | }
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119 | }
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120 |
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