index.js

var js2xmlparser = require("js2xmlparser");
var java = require('java');
var xml2js = require('xml2js');
var path = require('path');

var NodeHL7Complete = function() {
  var javaBridgeParser = null;
  var javaClassDependencies = [
      path.join(__dirname, 'java_dependencies', 'node-hl7-complete-0.0.1-SNAPSHOT.jar'),
      path.join(__dirname, 'java_dependencies', 'hapi-base-2.2.jar'),
      path.join(__dirname, 'java_dependencies', 'slf4j-api-1.7.16.jar'),
      path.join(__dirname, 'java_dependencies', 'hapi-osgi-base-2.2.jar'),
    ];

  java.classpath = java.classpath.concat(javaClassDependencies);
  javaBridgeParser = java.newInstanceSync('node_hl7_complete.hl7.Parser');

  var hl7ToJs = function(hl7String, callback) {
    javaBridgeParser.hl7ToXml(hl7String, function(javaBridgeParserError, xmlString) {
      if (javaBridgeParserError) {
        callback(javaBridgeParserError, null);
      } else {
        xml2js.parseString(xmlString, function(xml2jsError, jsObject) {
          if (xml2jsError) {
            callback(xml2jsError, null);
          } else {
            callback(null, jsObject);
          }
        });
      }
    });
  };

  var jsToHl7 = function(dataType, jsData, callback) {
    var xmlMessage = js2xmlparser(dataType, jsData[dataType]);

    var nameSpacedXmlMessage = xmlMessage
      .replace('<' + dataType + '>', '<' + dataType + ' xmlns=\"urn:hl7-org:v2xml\">')
      .replace(/[^\x20-\x7E]/gmi, '');

    javaBridgeParser.xmlToHl7(nameSpacedXmlMessage, function(xml2Hl7Error, hl7String) {
      if (xml2Hl7Error) {
        callback(xml2Hl7Error, null);
      } else {
        callback(null, hl7String);
      }
    });
  };

  // public API
  return {
    hl7ToJs: hl7ToJs,
    jsToHl7: jsToHl7
  };
};

module.exports = NodeHL7Complete;