Develop Reference

Mapping a CSVRecord to instance of class that I have

I am creating an endpoint that, gets parameters:
a CSV file
name of a class (that I will use to create an instance of)
In mapping I am using CommonsCSV library.
Although I am getting CSVRecord I couldn't map it to an instance of the class I got as a parameter.
Example:
as A parameter I got:-
CSV
id
firstName
lastName
1
John
Rodriguez
2
Michael
Hernandez
3
David
Smith
className
'employee'
// employee class
Class<?> classType = Class.forName(className);
// CSV file records
List<CSVRecord> records = csvParser.getRecords();
for (int i = 0; i < records.size(); i++) {
CSVRecord record = records.get(i);
// I want to get an instance of employee to save it to database like this
{
"id" : 1,
"firstName" : "John",
"lastName" : "Rodriguez"
}
}
Thanks in advance!

I think Super CSV can help you, detail you can check this doc. Super CSV
private static void readWithCsvBeanReader() throws Exception {
ICsvBeanReader beanReader = null;
try {
beanReader = new CsvBeanReader(new FileReader(CSV_FILENAME), CsvPreference.STANDARD_PREFERENCE);
// the header elements are used to map the values to the bean (names must match)
final String[] header = beanReader.getHeader(true);
final CellProcessor[] processors = getProcessors();
CustomerBean customer;
while( (customer = beanReader.read(CustomerBean.class, header, processors)) != null ) {
System.out.println(String.format("lineNo=%s, rowNo=%s, customer=%s", beanReader.getLineNumber(),
beanReader.getRowNumber(), customer));
}
}
finally {
if( beanReader != null ) {
beanReader.close();
}
}
}

getting first level of categorisation from Notes view

I have a categorized Notes view, let say the first categorized column is TypeOfVehicle the second categorized column is Model and the third categorized column is Manufacturer.
I would like to collect only the values for the first category and return it as json object:
I am facing two problems:
- I can not read the value for the category, the column values are emptry and when I try to access the underlying document it is null
the script won't hop over to the category/sibling on the same level.
can someone explain me what am I doing wrong here?
private Object getFirstCategory() {
JsonJavaObject json = new JsonJavaObject();
try{
String server = null;
String filepath = null;
server = props.getProperty("server");
filepath = props.getProperty("filename");
Database db;
db = utils.getSession().getDatabase(server, filepath);
if (db.isOpen()) {
View vw = db.getView("transport");
if (null != vw) {
vw.setAutoUpdate(false);
ViewNavigator nav;
nav = vw.createViewNav();
JsonJavaArray arr = new JsonJavaArray();
Integer count = 0;
ViewEntry tmpentry;
ViewEntry entry = nav.getFirst();
while (null != entry) {
Vector<?> columnValues = entry.getColumnValues();
if(entry.isCategory()){
System.out.println("entry notesid = " + entry.getNoteID());
Document doc = entry.getDocument();
if(null != doc){
if (doc.hasItem("TypeOfVehicle ")){
System.out.println("category has not " + "TypeOfVehicle ");
}
else{
System.out.println("category IS " + doc.getItemValueString("TypeOfVehicle "));
}
} else{
System.out.println("doc is null");
}
JsonJavaObject row = new JsonJavaObject();
JsonJavaObject jo = new JsonJavaObject();
String TypeOfVehicle = String.valueOf(columnValues.get(0));
if (null != TypeOfVehicle ) {
if (!TypeOfVehicle .equals("")){
jo.put("TypeOfVehicle ", TypeOfVehicle );
} else{
jo.put("TypeOfVehicle ", "Not categorized");
}
} else {
jo.put("TypeOfVehicle ", "Not categorized");
}
row.put("request", jo);
arr.put(count, row);
count++;
tmpentry = nav.getNextSibling(entry);
entry.recycle();
entry = tmpentry;
} else{
//tmpentry = nav.getNextCategory();
//entry.recycle();
//entry = tmpentry;
}
}
json.put("data", arr);
vw.setAutoUpdate(true);
vw.recycle();
}
}
} catch (Exception e) {
OpenLogUtil.logErrorEx(e, JSFUtil.getXSPContext().getUrl().toString(), Level.SEVERE, null);
}
return json;
}

What you're doing wrong is trying to treat any single view entry as both a category and a document. A single view entry can only be one of a category, a document, or a total.
If you have an entry for which isCategory() returns true, then for the same entry:
isDocument() will return false.
getDocument() will return null.
getNoteID() will return an empty string.
If the only thing you need is top-level categories, then get the first entry from the navigator and iterate over entries using nav.getNextSibling(entry) as you're already doing, but:
Don't try to get documents, note ids, or fields.
Use entry.getColumnValues().get(0) to get the value of the first column for each category.
If the view contains any uncategorised documents, it's possible that entry.getColumnValues().get(0) might throw an exception, so you should also check that entry.getColumnValues().size() is at least 1 before trying to get a value.
If you need any extra data beyond just top-level categories, then note that subcategories and documents are children of their parent categories.
If an entry has a subcategory, nav.getChild(entry) will get the first subcategory of that entry.
If an entry has no subcategories, but is a category which contains documents, nav.getChild(entry) will get the first document in that category.

RavenDB query returns null

I'm on RavenDB 3.5.35183. I have a type:
import com.mysema.query.annotations.QueryEntity;
#QueryEntity
public class CountryLayerCount
{
public String countryName;
public int layerCount;
}
and the following query:
private int getCountryLayerCount(String countryName, IDocumentSession currentSession)
{
QCountryLayerCount countryLayerCountSurrogate = QCountryLayerCount.countryLayerCount;
IRavenQueryable<CountryLayerCount> levelDepthQuery = currentSession.query(CountryLayerCount.class, "CountryLayerCount/ByName").where(countryLayerCountSurrogate.countryName.eq(countryName));
CountryLayerCount countryLayerCount = new CountryLayerCount();
try (CloseableIterator<StreamResult<CountryLayerCount>> results = currentSession.advanced().stream(levelDepthQuery))
{
while(results.hasNext())
{
StreamResult<CountryLayerCount> srclc = results.next();
System.out.println(srclc.getKey());
CountryLayerCount clc = srclc.getDocument();
countryLayerCount = clc;
break;
}
}
catch(Exception e)
{
}
return countryLayerCount.layerCount;
}
The query executes successfully, and shows the correct ID for the document I'm retrieving (e.g. "CountryLayerCount/123"), but its data members are both null. The where clause also works fine, the country name is used to retrieve individual countries. This is so simple, but I can't see where I've gone wrong. The StreamResult contains the correct key, but getDocument() doesn't work - or, rather, it doesn't contain an object. The collection has string IDs.
In the db logger, I can see the request coming in:
Receive Request # 29: GET - geodata - http://localhost:8888/databases/geodata/streams/query/CountryLayerCount/ByName?&query=CountryName:Germany
Request # 29: GET - 22 ms - geodata - 200 - http://localhost:8888/databases/geodata/streams/query/CountryLayerCount/ByName?&query=CountryName:Germany
which, when plugged into the browser, correctly gives me:
{"Results":[{"countryName":"Germany","layerCount":5,"#metadata":{"Raven-Entity-Name":"CountryLayerCounts","Raven-Clr-Type":"DbUtilityFunctions.CountryLayerCount, DbUtilityFunctions","#id":"CountryLayerCounts/212","Temp-Index-Score":0.0,"Last-Modified":"2018-02-03T09:41:36.3165473Z","Raven-Last-Modified":"2018-02-03T09:41:36.3165473","#etag":"01000000-0000-008B-0000-0000000000D7","SerializedSizeOnDisk":164}}
]}
The index definition:
from country in docs.CountryLayerCounts
select new {
CountryName = country.countryName
}
AFAIK, one doesn't have to index all the fields of the object to retrieve it in its entirety, right ? In other words, I just need to index the field(s) to find the object, not all the fields I want to retrieve; at least that was my understanding...
Thanks !

The problem is related to incorrect casing.
For example:
try (IDocumentSession sesion = store.openSession()) {
CountryLayerCount c1 = new CountryLayerCount();
c1.layerCount = 5;
c1.countryName = "Germany";
sesion.store(c1);
sesion.saveChanges();
}
Is saved as:
{
"LayerCount": 5,
"CountryName": "Germany"
}
Please notice we use upper case letters in json for property names (this only applies to 3.X versions).
So in order to make it work, please update json properties names + edit your index:
from country in docs.CountryLayerCounts
select new {
CountryName = country.CountryName
}
Btw. If you have per country aggregation, then you can simply query using:
QCountryLayerCount countryLayerCountSurrogate =
QCountryLayerCount.countryLayerCount;
CountryLayerCount levelDepthQuery = currentSession
.query(CountryLayerCount.class, "CountryLayerCount/ByName")
.where(countryLayerCountSurrogate.countryName.eq(countryName))
.single();

How to Iterate column with multiple values using cypher?

The code I tried was
firstNode = graphDb.createNode();//creating nodes like this
firstNode.setProperty( "person", "Andy " );
Label myLabel = DynamicLabel.label("person");
firstNode.addLabel(myLabel); ...
relationship = firstNode.createRelationshipTo( secondNode, RelTypes.emails );// creating relationships like this
relationship.setProperty( "relationship", "email " );....
Transaction tx1 = graphDb.beginTx();
try{
ExecutionEngine engine = new ExecutionEngine(graphDb);
ExecutionResult result = engine.execute("MATCH (sender:person)-[:emails]-(receiver) RETURN sender, count(receiver)as count, collect(receiver) as receivers ORDER BY count DESC ");..
and the result I obtained was:
sender | count | receivers
Node[2]{person:"Chris"} | 3 | [Node[4]{person:"Elsa "},Node[0]{person:"Andy "},Node[1]{person:"Bobby"}]
Node[4]{person:"Elsa "} | 3 | [Node[5]{person:"Frank"},Node[2]{person:"Chris"},Node[3]{person:"David"}]
Node[1]{person:"Bobby"} | 3 | [Node[2]{person:"Chris"},Node[3]{person:"David"},Node[0]{person:"Andy "}]
Node[5]{person:"Frank"} | 2 | [Node[3]{person:"David"},Node[4]{person:"Elsa "}
I want to iterate the receivers. so I tried the following :
for (Map<String,Object> row : result) {
Node x = (Node)row.get("receivers");
System.out.println(x);
for (String prop : x.getPropertyKeys()) {
System.out.println(prop +": "+x.getProperty(prop));
}
But it throws Exception in thread "main" java.lang.ClassCastException: scala.collection.convert.Wrappers$SeqWrapper cannot be cast to org.neo4j.graphdb.Node.
How can I do this?

The problem is that in your cypher query you collect the receiver.person property into an array called receivers. Receivers isn't a Node, its an array of properties. You can't cast that to strings. If you were looking to get the actual receiver nodes then you need to change your query statement to:
MATCH (sender:person)-[:emails]-(receiver) RETURN sender, count(receiver)as count, receiver as receivers ORDER BY count DESC
Alternatively, if you want to use the array of properties then you can do something like the code below:
Object receivers = row.get("receivers")
if(receivers instanceof String[]) {
for(String receiver in receivers) {
.. do something
}
} else {
// do something with receiver as a single string value
}
Clearly, you will need to change to type of receivers from String to the appropriate type if it isn't a String.

It is a simple thing.
try{
ExecutionEngine engine = new ExecutionEngine(graphDb);
ExecutionResult result = engine.execute("MATCH (sender:person)-[:emails]-(receiver) RETURN sender, count(receiver)as count, collect(receiver.person) as receivers ORDER BY count DESC ");
//ExecutionResult result = engine.execute("MATCH (sender:person)-[:emails]->(receiver) WITH sender, collect(receiver.person) as receivers, RETURN {sender: sender.person, receivers: receivers) ORDER BY size(receivers) DESC");
//System.out.println(result.dumpToString());
LinkedList list_prop = new LinkedList();
for (Map<String,Object> row : result) {
Node x = (Node)row.get("sender");
Object y = row.get("receivers");
System.out.println(y);
for (String prop_x : x.getPropertyKeys()) {
System.out.println(prop_x +": "+x.getProperty(prop_x));
}
}
tx1.success();
}
finally {
tx1.close();
}
In the match query, I used "collect(receiver.person) as receivers" instead of "collect(receiver) as receivers". It worked.

Nested loop in birt report

I'm using Eclipse Birt to generate report from a JSON File.
My JSON file look like this :
{
"cells":[
{
"type":"basic.Sensor",
"custom":{
"identifier":[
{
"name":"Name1",
"URI":"Value1"
},
{
"name":"Name4",
"URI":"Value4"
}
],
"classifier":[
{
"name":"Name2",
"URI":"Value2"
}
],
"output":[
{
"name":"Name3",
"URI":"Value3"
}
],
},
"image":{
"width":50,
"height":50,
"xlink:href":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIAAAACACAYAAADDPmHLAAAABHNCSVQICAgIfAhkiAAAAAlwSFlzAABEJAAARCQBQGfEVAAAABl0RVh0U29mdHdhcmUAd3Vi8f+k/EREURQtsda2Or/+nFLqP6T5Ecdi0aJFL85msz2Qxyf4JIumMAx/ClmWt23GmL1kO54CXANAVH+WiN4Sx7EoNVkU3Z41BDHMeXAxjvOxNr7RJjzHX7S/jAflwBxkJr/RwiOpWZ883Nzd+Wpld7tkBr/SJr7ZHZbHZeuVweSnPfniocMAWYwcGBafH0OoPamFGAaY4ZBZjmmFGAaY4ZBZjmmFGAaY4ZBZjmmFGAaY7/B94QnX08zxKLAAAAAElFTkSuQmCC"
}
}
},
{
"type":"basic.Sensor",
"custom":{
"identifier":[
{
"name":"Name1",
"URI":"Value1"
},
{
"name":"Name4",
"URI":"Value4"
}
],
"classifier":[
{
"name":"Name2",
"URI":"Value2"
}
],
"output":[
{
"name":"Name3",
"URI":"Value3"
}
],
},
"image":{
"width":50,
"height":50,
"xlink:href":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAgAAAAIACAYAAAD0eNT6AAAACXBIWXMAAAsTAAALEwEAmpwYAAAKT2lDQ1BQaG90b3Nob3AgSUNDIHByb2ZpbGUAAHjanVNnVFPpFj333vRCS4iAlEtvUhUIIFJCi4AUkSYqIQkQSoghodkVUcERRUUEG8igiAOOjoCMFVEsDIoK2AfkIaKOg6OIisr74Xuja9igAQAAAgAIoAEAAAIACKABAAACAAigAQAAAgAIoAEAAAIACKABAAACAAigAQAAAgAIoAEAAAIADqhvprADeSsau00l5NAAAAAElFTkSuQmCC"
}
}
},
{
"type":"basic.Platform",
"custom":{
"identifier":[
{
"name":"Name1",
"URI":"Value1"
}
],
"classifier":[
{
"name":"Name2",
"URI":"Value2"
}
],
"output":[
{
"name":"Name3",
"URI":"Value3"
}
],
"image":{
"width":50,
"height":50,
"xlink:href":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAQAAAA6TH0jqtg6U8EsCdnm3SpevSK7Pb85xABEMBuLAn2hxjRve7SFzYEaB/HhytLQ4ABRwCWBPvBKnRk6U8EkBeOD9f7iwAGHAGEYEmwDxLvzNKfCCDP8NGLQd3lY7D0JwI4kmlwfHhX6dTSXxsRAAHsWR7aUjc7uM5Wg=="
}
}
}
]
}
i have 3 cells and each one contains 1 Image 1 Name 1 Type and 3 Tables , this is what i have done so far :
what i'm struggling to do is a nested loop, i want to have for each object( Cell) in my JSON a paragraph numerated like this :
2.x Component cell's Name :
Image
Output Table
Identifier Table
Classifier Table
So to do this i need to itterate on each cell and then itterate on each table Output, identifier and classifier and i have no idea how can i do this, a nested loop. like a List which represent the number of cells, that contains 3 tables, one image , one name.
**Edit : **
this is the open method for the data set
// Grab the JSON file and place it in a string
fisTargetFile = new FileInputStream(new File("C:/Users/Sample Reports/moe.json"));
input = IOUtils.toString(fisTargetFile, "UTF-8");
// Store the contents in a variable
jsonData = input;
// Convert the String to a JSON object
myJSONObject = eval( '(' + jsonData + ' )' );
// Get the length of the object
len = myJSONObject.cells.length;
// Counter
count = 0;
Fetch method :
if(count < len) {
var name = myJSONObject.cells[count].attrs.text["text"];
var type = myJSONObject.cells[count].type;
var icon =myJSONObject.cells[count].attrs.image["xlink:href"];
icon = icon.split(",");
icon= icon[1];
imageDataBytes = icon;
row["name"] = name;
row["type"] = type;
row["icon"] = Base64ToBlob.toBytes(icon);
Logger.getAnonymousLogger().info( row["icon"]);
count++;
return true;
}
return false;

You want to use nested tables, there is a good tutorial showing how to link nested tables to an outer table: please watch carefully this demo first, in particular see how the sub-table is linked to the outer table through a dataset parameter.
Of course your case is more challenging because you need to do this with scripted datasets and multiple sub-tables. I already did something similar, you have to create one scripted dataset for each sub-table. Key-points are:
In "parameters" section of each sub-dataset, create one input parameter and name it for instance "systemID"
Create your sub-tables by "drag & drop" each dataset within the outer table
In "bindings" section of each sub-table, link parameter "systemID" to the ID field of the outer table
In "open" event of sub-datasets, access the value of the parameter with this expression: inputParams["systemID"] Thus you can filter related rows in "myJSONObject".
It is important to make sure "myJSONObject" is initialized once for all, otherwise performances could dramatically decrease if it is evaluated on each iteration. For example evaluate it in "initialize" event of the report.
That's it, it won't be easy but these elements should help to achieve this report.