I need to create a new multiple instance of objects for the Pojo class in drools decision table. I have implemented using two facts Student fact and subject fact class. I need to fire all the rules in the decision table and I need to add all the values into array-list of the objects. But I'm getting only last rule values of decision table. It seems like decision table values are getting overridden.
Fact 1
Class StudentFact{
private int id;
private String name;
private List<SubejctFact> subjectList;
public void setId(int id){
this.id = id;
}
public int getId(){
return id;
}
public void setName(String name){
this.Name = name;
}
public String getName(){
return name;
}
public void setSubjectList(List<Subject> subjectList) {
this.subjectList = subjectList;
}
public int getSubjectList() {
return subjectList;
}
}
Fact 2
Class SubjectFact{
private int subId;
private String subjectName;
public void setSubId(int subId){
this.subId= subId;
}
public int getSubId(){
return subId;
}
public void setSubjectName(String subjectName){
this.subjectName = subjectName;
}
public int getSubejctName(){
return subjectName;
}
}
Current Response
{
"id":123,
"name": "xyz",
"subjectList": [
{
"id": 6,
"name":"Hindi"
},
{
"id": 6,
"name":"Hindi"
}
}
Expected Response
{
"id":123,
"name": "xyz",
"subjectList": [
{
"id": 5,
"name":"English"
},
{
"id": 6,
"name":"Hindi"
}
}
My Decision Table looks like
Any one pls advise to achieve the expected response?
Each row in a table becomes a rule, each action column becomes a row in then block.
For each rule you need a statement to create Subject, statements to populate it and statement to add it to matching student.
Values in 'CREATE' and 'COLLECT' are needed, otherwise action will be skipped.
; is required in a cell without 'target object' and it is not required when you provide '$subject' and '$student' objects. Don't ask me why. Just analyzed generated drl.
You may want to hide two 'technical columns'.
This will generate two rules like below
package draft;
//generated from Decision Table
import draft.Student;
import draft.Subject;
// rule values at A9, header at A4
rule "Rule 1"
when
$student:Student(id == "123")
then
Subject $subject = new Subject();
$subject.setSubId(5);
$subject.setSubjectName('English');
$student.addSubject($subject);
end
// rule values at A10, header at A4
rule "Rule 2"
when
$student:Student(id == "123")
then
Subject $subject = new Subject();
$subject.setSubId(6);
$subject.setSubjectName('Hindi');
$student.addSubject($subject);
end
PS: I was struggling with " being automatically replaced by Calc editor to `` which was not valid symbol for drools parser, so I used single quotes, which appeared to be special symbol at the start of a cell in the editor and skipped. So actual cell value which finally worked for me was ''English'.
Here are my models
public class Student {
private int id;
private String name;
private List<Subject> subjectList = new ArrayList<>();
public Student(int id, String name) {
this.id = id;
this.name = name;
}
public void setId(int id) {
this.id = id;
}
public int getId() {
return id;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void addSubject(Subject subject) {
subjectList.add(subject);
}
public void setSubjectList(List<Subject> subjectList) {
this.subjectList = subjectList;
}
public List<Subject> getSubjectList() {
return subjectList;
}
}
public class Subject {
private int subId;
private String subjectName;
public void setSubId(int subId) {
this.subId = subId;
}
public int getSubId() {
return subId;
}
public void setSubjectName(String subjectName) {
this.subjectName = subjectName;
}
public String getSubejctName() {
return subjectName;
}
}
test
#DroolsSession(resources = "draft/ApplicableSubjects.xls",
builderProperties = "drools.dump.dir = target/dump")
public class PlaygroundTest {
#Rule
public DroolsAssert drools = new DroolsAssert();
#Test
public void testIt() {
drools.insertAndFire(new Student(123, "Student 123"));
drools.printFacts();
}
}
test output
00:00:00 --> inserted: Student[id=123,name=Student 123,subjectList=[]]
00:00:00 --> fireAllRules
00:00:00 <-- 'Rule 1' has been activated by the tuple [Student]
00:00:00 <-- 'Rule 2' has been activated by the tuple [Student]
00:00:00 Facts (1):
Student[id=123,name=Student 123,subjectList=[draft.Subject#1ded7b14, draft.Subject#29be7749]]
Related
I have this condition (property rent system, rent is counted per night)
Owner has one or more property. Property has description, price, and isOccupied attribute.
The property can be: hotel (with 3 room types), flat/apartment, and house for homestay.
Through a registry function, a customer can order one or more property available at certain date.
Here are the pre-defined conditions for registry function:
There are 2 registered owners and customers in the system.
Owner 1 has 10 hotel rooms (standard type) for US$30 per night and 3 hotel rooms (suite type) for US$60 per night.
Owner 2 has 3 apartments for US$70 per night and 5 homestay house for US$20 per night.
Customers can rent one or more owner's property for a certain date.
To model the property, I use inheritance concept. For now, it looks something like this.
Property.java
public class Property {
private String description;
private int propertyPrice;
private String ownerName; // should it be here? or should it be made in another class?
private boolean isOccupied;
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getPropertyPrice() {
return propertyPrice;
}
public void setPropertyPrice(int propertyPrice) {
this.propertyPrice = propertyPrice;
}
}
Hotel.java
public class Hotel extends Property {
private String[] roomType;
private int[] roomCount;
public Hotel(){
this.roomType = new String[]{"Standard", "Deluxe", "Suite"};
this.roomCount = new int[]{0, 0, 0};
}
public String[] getRoomType() {
return roomType;
}
public void setRoomType(String[] roomType) {
this.roomType = roomType;
}
public int[] getRoomCount() {
return roomCount;
}
public void setRoomCount(int[] roomCount) {
this.roomCount = roomCount;
}
}
Apartment.java
public class Apartment extends Property {
private int roomCount;
public int getRoomCount() {
return roomCount;
}
public void setRoomCount(int roomCount) {
this.roomCount = roomCount;
}
}
Homestay.java
public class HomestayRoom extends Property {
private String parentName;
public String getParentName() {
return parentName;
}
public void setParentName(String parentName) {
this.parentName = parentName;
}
}
What makes me confused is, how can I define the pre-defined conditions for registry to model owner-property relation? Should I make the owner at another class? If so, how can I relate the properties and its owner?
Most of what you have done is correct, but you could also have a property type enum
public enum PropertyType{
HOTEL,APARTMENT,HOMESTAY
}
Now you're super class would be
public class Property {
private String description;
private int propertyPrice;
private String ownerName;
private boolean isOccupied;
private PropertyType pt;
....
}
A constructor for hotel would be
public Hotel(){
this.roomType = new String[]{"Standard", "Deluxe", "Suite"};
this.roomCount = new int[]{0, 0, 0};
super(PropertyType.HOTEL);
}
Similarly you could have constructors for Homestay and Apartment, with the extra line of super(PropertyType.HOMESTAY) and super(PropertyType.APARTMENT) respectively.
I have used JDBC template to retrieve the details from database and I have a field with float value with 0.0 in the db. I was expecting only the employee name and id with this get request but not sure why i am getting this float value as well in the controller.
Please help me to resolve this issue. Thank You!
public Flux<Emplotee> getAllEmployeeIdsAndName() {
List<Employee> allEmployee = jdbcTemplate.query(Queries.GET_ALL_EMPLOYEE_IDS_NAME, new RowMapper<Employee>() {
#Override
public Employee mapRow(ResultSet resultSet, int i) throws SQLException {
Employee employee = new Employee();
employee.setId(resultSet.getString("employee_id"));
employee.setName(resultSet.getString("employee_name"));
return employee;
}
});
return Flux.fromIterable(allEmployee);
}
Query used:
private static final String GET_ALL_EMPLOYEE_IDS_NAME = "select employee_id , employee_name from employee";
I want to exclude this score value from the list.
{
"score": 0.0,
"employee_name": "John doe",
"employee_id": "97e3-f566c43cac3e"
}
public class Employee {
#JsonProperty("id")
private String employee_id;
private String employee_name;
private float score;
public String getId() {
return id;
}
public void setEmployeeId(String employee_id) {
this.id = id;
}
public String getName() {
return name;
}
public void setEmployeeName(String employeeName) {
this.name = name;
}
public float getScore() {
return score;
}
public void setScore(float score) {
this.score = score;
}
}
You may used primitive float in Employee class. Default value of float is 0.0f
Use wrapper class for float, ie Float. The default value of Float is null. So you will get response as
{
"score": null,
"employee_name": "John doe",
"employee_id": "97e3-f566c43cac3e"
}
Note:
If you really want to ignore the property, then you can use #JsonIgnore annotation.#JsonIgnore is used to ignore the logical property used in serialization and deserialization. #JsonIgnore can be used at setter, getter or field.
public class Employee {
#JsonProperty("id")
private String id;
private String name;
#JsonIgnore
private Float score;
public String getId() {
return id;
}
public void setEmployeeId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setEmployeeName(String name) {
this.name = name;
}
public Float getScore() {
return score;
}
public void setScore(Float score) {
this.score = score;
}
}
I'm using Jackson as part of a spring boot app. I am turning JSON into Java, and I am getting this error. I did some research, but I still don't understand what is going wrong or how to fix it.
Here is the JSON fragment:
"dataBlock": {
"sections": [
{
"info": "",
"prompt": "",
"name": "First Section",
"sequence": 0,
"fields": [],
"gatingConditions": [],
"guid": "480d160c-c34f-4022-97b0-e8a1f28c49ae",
"id": -2
}
],
"prompt": "",
"id": -1,
"name": ""
}
So my Java object for this "dataBlock" element:
public class DataBlockObject {
private int id;
private String prompt;
private String name;
private List<SectionObject> sections;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPrompt() {
return prompt;
}
public void setPrompt(String prompt) {
this.prompt = prompt;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<SectionObject> getSections() {
return sections;
}
public void setSections(List<SectionObject> sections) {
this.sections = sections;
}
}
And the Section object is this:
public class SectionObject {
private int id;
private String name;
private String prompt;
private String info;
private int sequence;
private List<FieldObject> fields;
private List<GatingConditionObject> gatingConditions;
private String guid;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPrompt() {
return prompt;
}
public void setPrompt(String prompt) {
this.prompt = prompt;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
public int getSequence() {
return sequence;
}
public void setSequence(int sequence) {
this.sequence = sequence;
}
public List<FieldObject> getFields() {
return fields;
}
public void setFields(List<FieldObject> fields) {
this.fields = fields;
}
public List<GatingConditionObject> getGatingConditions() {
return gatingConditions;
}
public void setGatingConditions(List<GatingConditionObject> gatingConditions) {
this.gatingConditions = gatingConditions;
}
public String getGuid() {
return guid;
}
public void setGuid(String guid) {
this.guid = guid;
}
}
So it seems to me that Jackson would make a DataBlockObject, map the obvious elemenets, and create an array that I have clearly marked as a List named sections. -- just like the JSON shows.
Now the error is:
Caused by: com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "sections" (class com.gridunity.workflow.bean.json.SectionObject), not marked as ignorable (8 known properties: "gatingConditions", "sequence", "prompt", "fields", "id", "info", "guid", "name"])
Now according to that error it would seem that one of my 8 elements should be named "sections" - But that's not one of my elements. It clearly has a problem with my List of Sections, but I cant figure out what it is.
Can someone explain WHY this is happening, especially sence it looks like I have my structure correct, and how to fix this. I have seen this on other posts:
objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
But that seems incredibly wrong as I know all of my properties.
It looks like the JSON itself has another sections field in one or more of the dataBlock.sections items. If you don't have control over the construction of the JSON object, you'll need to add a #JsonIgnoreProperties annotation on the SectionObject class so that when the JSON object has fields that aren't specified in the POJO, it won't throw an error during deserialization.
#JsonIgnoreProperties(ignoreUnknown = true)
public class SectionObject {
// class members and methods here
}
this is my current code to store rooms(it compiles fine) but in the UML there is a variable called addEquipment and there is also another class called Equipment to be defined. I'm having trouble wrapping my head around what I'm supposed to do with this. Am I supposed to create and call an object called Equipment? what goes in addEquipment?
public class Room {
//begin variable listing
private String name;
private int id;
private int capacity;
private String equipmentList;
//begins get methods for variables
public String getName(){
return name;
}
public int getID(){
return id;
}
public int getCapacity(){
return capacity;
}
public String getEquipmentList(){
return equipmentList;
}
// Set the variables
public void setName(String aName){
name=aName;
}
public void setID(int anID){
id=anID;
}
public void setCapacity(int aCapacity){
capacity=aCapacity;
}
public void setEquipmentList(String anEquipmentList){
equipmentList=anEquipmentList;
}
public String addEquipment(String newEquipment, String currentEquipment){
}
//Create room object
public Room(int capacity, String equipmentList) {
setCapacity(capacity);
setEquipmentList(equipmentList);
}
//Convert variables to string version of room
public String toString(){
return "Room "+name+", capacity: "+capacity+", equipment: "+getEquipmentList();
}
}
You can create a new class Equipment and modify your attribute equipmentList to be a List:
public class Equipment {
private String name;
public Equipment(String name) {
this.name = name;
}
}
public class Room {
//begin variable listing
private String name;
private int id;
private int capacity;
private List<Equipment> equipmentList = new ArrayList<Equipment>();
//begins get methods for variables
public String getName(){
return name;
}
public int getID(){
return id;
}
public int getCapacity(){
return capacity;
}
public List<Equipment> getEquipmentList(){
return equipmentList;
}
// Set the variables
public void setName(String aName){
name=aName;
}
public void setID(int anID){
id=anID;
}
public void setCapacity(int aCapacity){
capacity=aCapacity;
}
public void setEquipmentList(List<Equipment> anEquipmentList){
equipmentList=anEquipmentList;
}
public String addEquipment(String newEquipment, String currentEquipment){
Equipment oneEquipment = new Equipment(newEquipment);
equipmentList.add(oneEquipment);
}
//Create room object
public Room() {
setCapacity(capacity);
setEquipmentList(equipmentList);
}
//Convert variables to string version of room
public String toString(){
String capacity=String.valueOf(getCapacity());
String room = "Room "+name+", capacity: "+capacity+", equipment: "+getEquipmentList();
return room;
}
}
In the method addEquipment, you can create a new Equipment and add it to equipmentList, like code above.
An Equipment class could be anything. Lets assume the "Equipment"-class has a String called "name" as it's attribute
public class Equipment {
String name;
public Equipment( String name) {
this.name = name;
}
public String getName() {
return this.name
}
}
When you extend your Room class by the requested "addEquipment" method, you can do something like this.
public class Room {
... // Your code
private int equipmentIndex = 0;
private Equipment[] equipment = new Equipment[10]; // hold 10 Equipment objects
public void addEquipment( Equipment eq ) {
if ( equipmentIndex < 10 ) {
equipment[ equipmentIndex ] = eq;
equipmentIndex++;
System.out.println("Added new equipment: " + eq.getName());
} else {
System.out.println("The equipment " + eq.getName() + " was not added (array is full)");
}
}
}
Now when you call
room.addEquipment( new Equipment("Chair") );
on your previously initialized object of the Room-class, you will get
"Added new equipment: Chair"
Hope this helps a bit.
PS: The code is untestet (maybe there hides a syntax error somewhere)
I am writing some test code to learn spring-data with MongoDB. I can successfully create two Documents: Person and ADocument, where ADocument contains a reference to Person.
#Document
public class Person {
#Id
private ObjectId id;
#Indexed
private String name;
public ObjectId getId() {
return id;
}
public void setId(ObjectId id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
...
#Document
public class ADocument {
#Id
private ObjectId id;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
private String title;
private String text;
#DBRef
private Person docperson;
public Person getDocperson() {
return docperson;
}
public void setDocperson(Person docperson) {
this.docperson = docperson;
}
public ObjectId getId() {
return id;
}
public void setId(ObjectId id) {
this.id = id;
}
}
The problem arises when I try to get all the 'adocuments' related to a person by using the person's ID (once the person's name is provided):
public List<ADocument> loadDocumentsByPersonName(String pname) {
Query qPerson = new Query().addCriteria(Criteria.where("name").is(pname));
qPerson.fields().include("_id");
Person pers = mongoTemplate.findOne(qPerson, Person.class);
ObjectId persId = pers.getId();
Query qDoc = new Query().addCriteria(Criteria.where("person.$id").is(persId));
System.out.println(qDoc.toString());
List<ADocument> list2 = mongoTemplate.find(qDoc, ADocument.class);
return list2;
}
Everyting works fine except that list2 is always empty (while it shouldn't).
System.out.println(qDoc.toString()) gives something like:
Query: { "person.$id" : { "$oid" : "536a0d50e4b0d0c10297f2ab"}}, Fields: null, Sort: null
If I try to issue the query above on the Mongo shell I get the following:
db.adocument.find({ "person.$id" : { "$oid" : "536a0805e4b0af174d0b5871"}})
error: {
"$err" : "Can't canonicalize query: BadValue unknown operator: $oid",
"code" : 17287
}
While if I type
db.adocument.find({ "person.$id" : ObjectId("536a0805e4b0af174d0b5871")})
I actually get a result!
I am using MongoDB 2.6.0 and Spring Data 1.4.2.
I really can't figure out what's going on... Any help is extremely appreciated!
I got it!
For some reason, I had to explicit the collection name in the Query:
List list2 = mongoTemplate.find(qDoc, ADocument.class, COLLECTION_NAME);
where COLLECTION_NAME="adocument".
As for the shell behaviour, it seems that Query.toString() does never return a correct syntax to be cut and paste for shell execution.