ew.levr.db.skyrepo.5.15.0.source-code.skyrepo.helper.js Maven / Gradle / Ivy
/**
* Helper function to flatten any string-language objects (Objects
* with @value and @lang fields only) into an elasticsearch
* friendly type
*
* @param jsonLd object to flatten
* @returns flattened jsonLd object as String
*/
// @first is an internal parameter to indicate which call is not a recursive call (used to return a string object at the end)
function flattenStringFields(jsonLd, first){
if(jsonLd == undefined){
jsonLd = JSON.parse(this.params.obj);
first = true;
}
if(Array.isArray(jsonLd)){
var ret = [];
for(idx in jsonLd){
ret.push(flattenStringFields(jsonLd[idx], false));
}
return ret;
}else if(jsonLd === Object(jsonLd)){
for(var key in jsonLd){
try{
var field = jsonLd[key];
// Check if objects in array are string-language objects
if(Array.isArray(field) && field.length > 0){
var flattenText = true; // flag identifying if they are string-language objects
var textArray = [];
var langArray = [];
for(var idx in field){
var obj = field[idx];
if(obj === Object(obj)){
if(Object.keys(obj).length == 2 && obj["@value"] != undefined && obj["@language"] != undefined){
textArray.push(obj["@value"]);
langArray.push(obj["@language"]);
}else{
flattenText = false
}
}else{
flattenText = false;
}
}
// if not string-language objects keep recursing
if(!flattenText){
jsonLd[key] = flattenStringFields(field, false);
// otherwise flatten @value to field and create @language field
}else{
jsonLd[key] = textArray;
jsonLd[key+"@language"] = langArray;
}
// Check if object is a string-language object
}else if(field === Object(field)){
// if string-language object flatten @value to field and create @language field
if(Object.keys(field).length == 2 && field["@value"] != undefined && field["@language"] != undefined){
jsonLd[key] = field["@value"];
jsonLd[key+"@language"] = field["@language"];
// otherwise keep recursing
}else if (Object.keys(field).length > 0){
jsonLd[key] = flattenStringFields(field, false);
}
}
}catch(exception){
error("Exception when flattening json-ld text fields: "+exception.message)
}
}
}
if(first != undefined && first == false){
return jsonLd;
}else{
return JSON.stringify(jsonLd)
}
}