source: other-projects/hathitrust/solr-extracted-features/trunk/src/main/java/org/hathitrust/extractedfeatures/PagedJSON.java@ 31002

package org.hathitrust.extractedfeatures;

import java.util.ArrayList;
import java.util.Iterator;
import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.api.java.function.VoidFunction;
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 PagedJSON extends BasePerJSON implements FlatMapFunction<String, JSONObject>
//public class PagedJSON implements VoidFunction<String> 
{
    private static final long serialVersionUID = 1L;
    
    public PagedJSON(String input_dir, String solr_url, String output_dir, int verbosity, 
                     DoubleAccumulator progress_accum, double progress_step)
    {
        super(input_dir,solr_url,output_dir,verbosity,progress_accum,progress_step);
    }
    
    
    public Iterator<JSONObject> call(String json_file_in) 
    //public void call(String json_file_in) 
    { 
        JSONObject extracted_feature_record = JSONClusterFileIO.readJSONFile(_input_dir + "/" + json_file_in);
        
        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();
        
        // Make directory for page-level JSON output
        String json_dir = ClusterFileIO.removeSuffix(json_file_in,".json.bz2");
        String page_json_dir = json_dir + "/pages";
        ClusterFileIO.createDirectoryAll(_output_dir + "/" + page_json_dir);
        
        ArrayList<JSONObject> json_pages = new ArrayList<JSONObject>(ef_num_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) {
              System.out.println("  Page: " + page_id);
            }
            
            String output_json_bz2 = page_json_dir +"/" + formatted_i + ".json.bz2";
            //ids.add(output_json_bz2);
            
            if (i==0) {
                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 = JSONSolrTransform.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);
            }
            
        }
        
        
        //ids.add(volume_id);
        _progress_accum.add(_progress_step);
        
        //return ids.iterator();
        return json_pages.iterator();
    }
    
    
}