source: other-projects/hathitrust/wcsa/extracted-features-solr/trunk/solr-ingest/src/main/java/org/hathitrust/extractedfeatures/PerPageJSONFlatmap.java@ 31096

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 PagedJSON implements Function<String, Boolean> {

    private static final long serialVersionUID = 1L;

    public Boolean call(String s) { return s.contains("a"); }
}
 */


class PerPageJSONFlatmap implements FlatMapFunction<String, JSONObject>
//public class PagedJSON implements VoidFunction<String> 
{
    private static final long serialVersionUID = 1L;
    
    protected String _input_dir;
    protected String _solr_url;
    protected String _output_dir;
    protected int    _verbosity;
    
    protected DoubleAccumulator _progress_accum;
    protected double            _progress_step;
    
    boolean _strict_file_io;
    
    public PerPageJSONFlatmap(String input_dir, String solr_url, String output_dir, int verbosity, 
                              DoubleAccumulator progress_accum, double progress_step,
                              boolean strict_file_io)
    {
        _input_dir  = input_dir;
        _solr_url   = solr_url;
        _output_dir = output_dir;
        _verbosity  = verbosity;
        
        _progress_accum = progress_accum;
        _progress_step  = progress_step;
        
        _strict_file_io = strict_file_io;
    }
    
    
    public Iterator<JSONObject> call(String json_file_in) throws IOException
    //public void call(String json_file_in) 
    { 
            //ClusterFileIO.memory_usage("Before BZIP2 JSON file read");
        String full_json_file_in = _input_dir + "/" + json_file_in;
        JSONObject extracted_feature_record = JSONClusterFileIO.readJSONFile(full_json_file_in);
        //ClusterFileIO.memory_usage("After BZIP2 JSON file read");

        ArrayList<JSONObject> json_pages = new ArrayList<JSONObject>();
        
        if (extracted_feature_record != null) {
            String volume_id = extracted_feature_record.getString("id");

            //JSONObject ef_metadata = extracted_feature_record.getJSONObject("metadata");
            //String title= ef_metadata.getString("title");

            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 + ")"); 
            }

            // Make directory for page-level JSON output
            String json_dir = ClusterFileIO.removeSuffix(json_file_in,".json.bz2");
            String page_json_dir = json_dir + "/pages";

            if (_output_dir != null) {
                // Only need to do this once per volume, so easier to here than in the per-page Map
                ClusterFileIO.createDirectoryAll(_output_dir + "/" + page_json_dir);
            }
            if (_verbosity >= 2) {
                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 >= 2) {
                    if (i>0) {
                        System.out.print(", ");
                    }
                    System.out.print(page_id);
                }

                String output_json_bz2 = page_json_dir +"/" + formatted_i + ".json.bz2";
                
                if (i==(ef_page_count-1)) {
                    if (_verbosity >= 2) {
                        System.out.println();
                    }
                    System.out.println("Sample output JSON page file: " + output_json_bz2);
                }

                JSONObject ef_page = ef_pages.getJSONObject(i);

                if (ef_page != null) {
                    // Convert to Solr add form
                    JSONObject solr_add_doc_json = SolrDocJSON.generateSolrDocJSON(volume_id, page_id, ef_page);
                    solr_add_doc_json.put("filename_json_bz2", output_json_bz2);

                    json_pages.add(solr_add_doc_json);


                }
                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 json_pages.iterator();
    }
    
    
}