source: other-projects/hathitrust/wcsa/extracted-features-solr/trunk/solr-ingest/src/main/java/org/hathitrust/extractedfeatures/PerVolumePOSStreamFlatmap.java@ 32101

package org.hathitrust.extractedfeatures;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;

import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.util.DoubleAccumulator;
import org.json.JSONArray;
import org.json.JSONObject;

class PerVolumePOSStreamFlatmap implements FlatMapFunction<String, String>
{
    private static final long serialVersionUID = 1L;
    
    protected String _input_dir;
    protected int    _verbosity;
    
    protected DoubleAccumulator _progress_accum;
    protected double            _progress_step;
    
    boolean _strict_file_io;
    
    public PerVolumePOSStreamFlatmap(String input_dir, int verbosity, 
                              DoubleAccumulator progress_accum, double progress_step,
                              boolean strict_file_io)
    {
        _input_dir  = input_dir;
        _verbosity  = verbosity;
        
        _progress_accum = progress_accum;
        _progress_step  = progress_step;
        
        _strict_file_io = strict_file_io;
    }
    
    public Iterator<String> call(String json_file_in) throws IOException
    { 
         
        String full_json_file_in = _input_dir + "/" + json_file_in;
        JSONObject extracted_feature_record = JSONClusterFileIO.readJSONFile(full_json_file_in);
        
        ArrayList<String> all_pos_list = new ArrayList<String>();
        
        if (extracted_feature_record != null) {
            String volume_id = extracted_feature_record.getString("id");

            JSONObject ef_features = extracted_feature_record.getJSONObject("features");

            int ef_page_count = ef_features.getInt("pageCount");

            if (_verbosity >= 1) {
                System.out.println("Processing: " + json_file_in);
                System.out.println("  pageCount = " + ef_page_count);
            }

            JSONArray ef_pages = ef_features.getJSONArray("pages");
            int ef_num_pages = ef_pages.length();
            if (ef_num_pages != ef_page_count) {
                System.err.println("Warning: number of page elements in JSON (" + ef_num_pages + ")"
                        +" does not match 'pageCount' metadata (" + ef_page_count + ")"); 
            }
    
            if (_verbosity >= 3) {
                System.out.print("  Pages: ");
            }

            for (int i = 0; i < ef_page_count; i++) {
                String formatted_i = String.format("page-%06d", i);
                String page_id = volume_id + "." + formatted_i;

                if (_verbosity >= 3) {
                    if (i>0) {
                        System.out.print(", ");
                    }
                    System.out.print(page_id);
                }

                if (i==(ef_page_count-1)) {
                    if (_verbosity >= 3) {
                        System.out.println();
                    }
                }

                JSONObject ef_page = ef_pages.getJSONObject(i);

                if (ef_page != null) {
                    
                    ArrayList<String> page_pos_list = SolrDocJSON.generateTokenPosCountPOSLabels(volume_id, page_id, ef_page);                  
                    all_pos_list.addAll(page_pos_list);
                }
                else {
                    System.err.println("Skipping: " + page_id);
                }
            }
        }
        else {
            // File did not exist, or could not be parsed
            String mess = "Failed to read in bzipped JSON file '" + full_json_file_in + "'";
            if (_strict_file_io) {
                throw new IOException(mess);
            }
            else {
                System.err.println("Warning: " + mess);
                System.out.println("Warning: " + mess);
            }
        }

        _progress_accum.add(_progress_step);
        
        return all_pos_list.iterator();
    }
    
    
}