source: other-projects/hathitrust/solr-extracted-features/trunk/src/main/java/org/hathitrust/extractedfeatures/JSONSolrTransform.java@ 31001

package org.hathitrust.extractedfeatures;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Iterator;

import org.apache.commons.compress.compressors.CompressorException;
import org.json.JSONObject;

public class JSONSolrTransform {

    protected static String generateSolrText(JSONObject ef_token_pos_count)
        {
            StringBuilder sb = new StringBuilder();
    
            Iterator<String> token_iter = ef_token_pos_count.keys();
            while (token_iter.hasNext()) {
                String token = token_iter.next();
                
                sb.append(token);
                if (token_iter.hasNext()) {
                    sb.append(" ");
                }
            }
            
            /*
            Set<String> token_keys = ef_token_pos_count.keySet();
            for (String token : token_keys) {
                    sb.append(token + " ");
            }
    */
            
           return sb.toString();
        }

    protected static JSONObject generateSolrDocJSON(String volume_id, String page_id, JSONObject ef_page) 
    {
        JSONObject solr_update_json = null;
        
        if (ef_page != null) {
            JSONObject ef_body = ef_page.getJSONObject("body");
            if (ef_body != null) {
                JSONObject ef_token_pos_count = ef_body.getJSONObject("tokenPosCount");
                if (ef_token_pos_count != null) {
    
                    JSONObject solr_add_json = new JSONObject();
    
                    String text = generateSolrText(ef_token_pos_count);
                    
                    JSONObject solr_doc_json = new JSONObject();
                    solr_doc_json.put("id", page_id);
                    solr_doc_json.put("volumeid_s", volume_id);
                    solr_doc_json.put("eftext_txt", text);
                   
                    solr_add_json.put("commitWithin", 5000);
                    solr_add_json.put("doc", solr_doc_json);
                    
                    solr_update_json = new JSONObject();
                    solr_update_json.put("add",solr_add_json);
                    
                }
                else {
                    System.err.println("Warning: empty tokenPosCount field for '" + page_id + "'");
                }
            }
            else {
                System.err.println("Warning: empty body field for '" + page_id + "'");
            }
            
        }
        else {
            System.err.println("Warning: null page for '" + page_id + "'");
        }
        
        
        /*
          
         /update/json/docs
         */
        
        // For Reference ...
        // Example documentation on Solr JSON syntax:
        //   https://cwiki.apache.org/confluence/display/solr/Uploading+Data+with+Index+Handlers
        //     #UploadingDatawithIndexHandlers-JSONFormattedIndexUpdates
        
        /*
        curl -X POST -H 'Content-Type: application/json' 'http://localhost:8983/solr/my_collection/update' --data-binary '
        {
          "add": {
            "doc": {
              "id": "DOC1",
              "my_boosted_field": {         use a map with boost/value for a boosted field 
                "boost": 2.3,
                "value": "test"
              },
              "my_multivalued_field": [ "aaa", "bbb" ]    Can use an array for a multi-valued field 
            }
          },
          "add": {
            "commitWithin": 5000,           commit this document within 5 seconds 
            "overwrite": false,             don't check for existing documents with the same uniqueKey 
            "boost": 3.45,                  a document boost 
            "doc": {
              "f1": "v1",                   Can use repeated keys for a multi-valued field 
              "f1": "v2"
            }
          },
         
          "commit": {},
          "optimize": { "waitSearcher":false },
         
          "delete": { "id":"ID" },          delete by ID 
          "delete": { "query":"QUERY" }     delete by query 
        }'
        */
        
        return solr_update_json;
    }

    public static void saveSolrDoc(JSONObject solr_add_doc_json, String output_file_json_bz2)
    {
        try {
            BufferedWriter bw = ClusterFileIO.getBufferedWriterForCompressedFile(output_file_json_bz2);
            bw.write(solr_add_doc_json.toString());
            bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (CompressorException e) {
            e.printStackTrace();
        }
    }
    
    public static void postSolrDoc(String post_url, JSONObject solr_add_doc_json)
    {
        
        //String curl_popen = "curl -X POST -H 'Content-Type: application/json'";
        //curl_popen += " 'http://10.11.0.53:8983/solr/htrc-pd-ef/update'";
        //curl_popen += " --data-binary '";
        //curl_popen += "'"


        try {
            HttpURLConnection httpcon = (HttpURLConnection) ((new URL(post_url).openConnection()));
            httpcon.setDoOutput(true);
            httpcon.setRequestProperty("Content-Type", "application/json");
            httpcon.setRequestProperty("Accept", "application/json");
            httpcon.setRequestMethod("POST");
            httpcon.connect();

            byte[] outputBytes = solr_add_doc_json.toString().getBytes("UTF-8");
            OutputStream os = httpcon.getOutputStream();
            os.write(outputBytes);
            os.close();
            
            
            // Read response
            StringBuilder sb = new StringBuilder();
            BufferedReader in = new BufferedReader(new InputStreamReader(httpcon.getInputStream()));
            String decodedString;
            while ((decodedString = in.readLine()) != null) {
                sb.append(decodedString);
            }
            in.close();

            JSONObject solr_status_json = new JSONObject(sb.toString());
            JSONObject response_header_json = solr_status_json.getJSONObject("responseHeader");
            if (response_header_json != null) {
                int status = response_header_json.getInt("status");
                if (status != 0) {
                    System.err.println("Warning: POST request to " + post_url + " returned status " + status);
                    System.err.println("Full response was: " + sb);
                }
            }
            else {
                System.err.println("Failed response to Solr POST: " + sb);
            }
            
            
            
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        
    }
}