import com.psddev.cms.db.Content;
import com.psddev.dari.db.Recordable;
public class MattContent extends Content {
private String tt;
private String uu;
public String getUu() {
return uu;
}
public MattContent setUu(String uu) {
this.uu = uu;
return this;
}
public String getTt() {
return tt;
}
public MattContent setTt(String tt) {
this.tt = tt;
return this;
}
#Recordable.DisplayName("Headline")
private String title;
#Recordable.DisplayName("Fields")
private String fields;
#Recordable.Regex(value=".+\\#.+\\..+", validationMessage="Use email format 'myemail#address.com'")
private String email;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
The code above renders individual fields in the UI from a Java class using the Dari framework in Brightspot CMS. I would like to do more than individual fields, but Collections as well.
I can see how to set up a Collection for users in the docs:
https://docs.brightspot.com/4.0/en/plugins-guide/collections/creating-collections.html
However, I cannot find the annotation in Dari to set this up for devs:
https://docs.brightspot.com/4.2/en/dari-guide/data-modeling/data-modeling-annotations.html
I'd really appreciate any help in pointing me to the right section of the documentation. This may be a vocabulary issue -- I may not be typing in the right words to get this information.
*"Cluster" isn't yielding the results I'm looking for either.
Thanks for your time and help.
Solution: There is no annotation needed for a collection. One can write a simple set or list:
private Set<Internal> internalSet;
private List<Internal> internalList;
The solution is so simple, I overlooked the obvious: annotations are extras in Dari, not essential for rendering content to Brightspot CMS' UI.
I'm using cucumber-jvm and cucumber-guice in my project for test automation. I have a POJO with builder pattern:
class Book {
String title;
String author;
String date;
// builder, getter, setter
}
Then, in cucumber test I need to share the state of the Book object among two steps:
class BookSteps {
#Inject
Book book;
void firstStep() {
buildBook();
}
void secondStep() {
buildBook().setDate("2019-09-04");
}
Book buildBook() {
return book = Book().BookBuilder().title("Foo").author("Bar").build();
}
}
So, as I understood the builder pattern correctly, it creates an immutable object of book. But, why then I'm able to modify its state in secondStep() method by calling a setDate() on it and eventually modifying it?
You are able to modify state because builder pattern is not implemented correctly. In builder pattern:
You don't provide mutators(or setters) in your class. Only way to set properties of your class is via builder. Properties can be set only , either via builder constructor or via the mutator methods of builder. Usually for mandatory fields , you initialize them via builder constructor and then set other optional properties using builder setter methods.
So your Book class with builder patter should look like as below :
public class Book {
private String title;
private String author;
private String date;
private Book(Builder builder) {
title = builder.title;
author = builder.author;
date = builder.date;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
public String getDate() {
return date;
}
public static final class Builder {
private String title;
private String author;
private String date;
public Builder() {
}
public Builder title(String val) {
title = val;
return this;
}
public Builder author(String val) {
author = val;
return this;
}
public Builder date(String val) {
date = val;
return this;
}
public Book build() {
return new Book(this);
}
}
}
And below is the test class:
public class TestBookBuilder {
public static void main(String[] args) {
Book book = new Book.Builder().title("Book title").author("Book Author").date("25-01-2020").build();
}
}
Now instance of Book class is immutable.
Hope it was helpful.
I’ve got an application with Hibernate (JPA) which I am using in combination with Jinq. I’ve got a table which lists entities and I want the user to be able to filter it. In the table there are persons listed.
#Entity
public class Person {
private String firstName;
private String surName;
#Id
private int id;
public Person() {
}
public Person(final String pFirstName, final String pSurName, final int pID) {
firstName = pFirstName;
surName = pSurName;
id = pID;
}
public int getId() {
return id;
}
public void setId(final int pID) {
id = pID;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(final String pFirstName) {
return firstName = pFirstName;
}
public String getSurName() {
return surName;
}
public void setSurName(final String pSurName) {
surName = pSurName;
}
}
I am using JavaFX for this, but this shouldn’t matter. First thing I tried was to filter the persons by their surname. For filtering, I used Jinq in combination with lambda. My filtering code looks like this:
private List<Person> getFilteredPersons(final String pSurName){
JPAJinqStream<Person> stream = streamProvider.streamAll(Person.class);
stream.where(person -> person.getSurName().contains(pSurName));
List<Person> filteredList = stream.toList();
stream.close();
return filteredList;
}
So the object I am operating on is a normal String. I don’t think that my Person class has anything to do with that. My first thought was, that you can’t use the method boolean contains(...) in lambda because when the error showed up, it said:
Caused by: java.lang.IllegalArgumentException: Could not analyze lambda code
So my question is, is it somehow possible to use the contains-method of a String in lambdacode?
Your question has nothing to do with JPA or lambdas, but everything to do with jinq: it simply doesn't support translating String.contains() to a database query. See http://www.jinq.org/docs/queries.html#N65890 for what is supported.
In AppEngine I need to have an entity Diagram that contains an id, title and a variable list of elements of inner class Box, each one with id and description.
Please find below the definition. However, at time of defining the EntityProxy List getter and setter: "The type java.util.List<Box> cannot be used here".
DIAGRAM.java
#Entity
public class Diagram extends DatastoreObject {
public class Box {
private String boxId;
private String description;
public String get_id() {
return boxId;
}
public void set_id(String boxId) {
this.boxId = boxId;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
#Indexed private String diagramId; // Primary key
#Indexed private String title;
#Embedded private List<Box> boxes;
public String get_id() {
return diagramId;
}
public void set_id(String diagramId) {
this.diagramId = diagramId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public void setBoxes(List<Box> boxes) {
this.boxes = boxes
}
public List<Box> getBoxes() {
return boxes;
}
}
DIAGRAMPROXY.java
[...]
List<Box> getBoxes();
void setBoxes(List<Box> boxes);
[...]
Your inner class must be static. Nonstatic inner classes have an implicit link to an instance of the outer class, which would be really confusing from the perspective of loading and saving entities to the datastore.
Confusing, you have a Collection<Box> in the Box class? Doesnt sound right.. Anyways the inner Box class must be market static or be moved to a different file. Use the #Embed (version 4.0) annotation on the Box class.
Also, assuming DatastoreObject is the base of all your entities, you can make DatastoreObject as an #Entity and all its sub classes as an #EntitySubClass (index = true). Obviously all sub entities would be be saved under the same 'kind' (DatastoreObject) in the datastore.
Recently I've started hearing about "POJOs" (Plain Old Java Objects). I googled it, but still don't understand the concept well. Can anyone give me a clear description of a POJO?
Consider a class "Person" with variables "id, name, address, salary" -- how would I create a POJO for this scenario? Is the code below a POJO?
public class Person {
//variables
People people = new People();
private int id;
private String name;
private String address;
private int salary;
public int getId() {
return id;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}
public int getSalary() {
return salary;
}
public void setId() {
this.id = id;
}
public void setName() {
this.name = name;
}
public void setAddress() {
this.address = address;
}
public void setSalary() {
this.salary = salary;
}
}
A POJO is just a plain, old Java Bean with the restrictions removed. Java Beans must meet the following requirements:
Default no-arg constructor
Follow the Bean convention of getFoo (or isFoo for booleans) and setFoo methods for a mutable attribute named foo; leave off the setFoo if foo is immutable.
Must implement java.io.Serializable
POJO does not mandate any of these. It's just what the name says: an object that compiles under JDK can be considered a Plain Old Java Object. No app server, no base classes, no interfaces required to use.
The acronym POJO was a reaction against EJB 2.0, which required several interfaces, extended base classes, and lots of methods just to do simple things. Some people, Rod Johnson and Martin Fowler among them, rebelled against the complexity and sought a way to implement enterprise scale solutions without having to write EJBs.
Martin Fowler coined a new acronym.
Rod Johnson wrote "J2EE Without EJBs", wrote Spring, influenced EJB enough so version 3.1 looks a great deal like Spring and Hibernate, and got a sweet IPO from VMWare out of it.
Here's an example that you can wrap your head around:
public class MyFirstPojo
{
private String name;
public static void main(String [] args)
{
for (String arg : args)
{
MyFirstPojo pojo = new MyFirstPojo(arg); // Here's how you create a POJO
System.out.println(pojo);
}
}
public MyFirstPojo(String name)
{
this.name = name;
}
public String getName() { return this.name; }
public String toString() { return this.name; }
}
POJO:- POJO is a Java object not bound by any restriction other than those forced by the Java Language Specification.
Properties of POJO
All properties must be public setter and getter methods
All instance variables should be private
Should not Extend prespecified classes.
Should not Implement prespecified interfaces.
Should not contain prespecified annotations.
It may not have any argument constructors
Example of POJO
public class POJO {
private String value;
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
A POJO is a Plain Old Java Object.
From the wikipedia article I linked to:
In computing software, POJO is an
acronym for Plain Old Java Object. The
name is used to emphasize that a given
object is an ordinary Java Object, not
a special object, and in particular
not an Enterprise JavaBean
Your class appears to already be a POJO.
POJO class acts as a bean which is used to set and get the value.
public class Data
{
private int id;
private String deptname;
private String date;
private String name;
private String mdate;
private String mname;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getDeptname() {
return deptname;
}
public void setDeptname(String deptname) {
this.deptname = deptname;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getMdate() {
return mdate;
}
public void setMdate(String mdate) {
this.mdate = mdate;
}
public String getMname() {
return mname;
}
public void setMname(String mname) {
this.mname = mname;
}
}
When you aren't doing anything to make your class particularly designed to work with a given framework, ORM, or other system that needs a special sort of class, you have a Plain Old Java Object, or POJO.
Ironically, one of the reasons for coining the term is that people were avoiding them in cases where they were sensible and some people concluded that this was because they didn't have a fancy name. Ironic, because your question demonstrates that the approach worked.
Compare the older POD "Plain Old Data" to mean a C++ class that doesn't do anything a C struct couldn't do (more or less, non-virtual members that aren't destructors or trivial constructors don't stop it being considered POD), and the newer (and more directly comparable) POCO "Plain Old CLR Object" in .NET.
According to Martin Fowler
The term was coined while Rebecca Parsons, Josh MacKenzie and I were preparing for a talk at a conference in September 2000. In the talk, we were pointing out the many benefits of encoding business logic into regular java objects rather than using Entity Beans. We wondered why people were so against using regular objects in their systems and concluded that it was because simple objects lacked a fancy name. So we gave them one, and it’s caught on very nicely.
Generally, a POJO is not bound to any restriction and any Java object can be called a POJO but there are some directions. A well-defined POJO should follow below directions.
Each variable in a POJO should be declared as private.
Default constructor should be overridden with public accessibility.
Each variable should have its Setter-Getter method with public accessibility.
Generally POJO should override equals(), hashCode() and toString() methods of Object (but it's not mandatory).
Overriding compare() method of Comparable interface used for sorting (Preferable but not mandatory).
And according to Java Language Specification, a POJO should not have to
Extend pre-specified classes
Implement pre-specified interfaces
Contain pre-specified annotations
However, developers and frameworks describe a POJO still requires the use prespecified annotations to implement features like persistence, declarative transaction management etc. So the idea is that if the object was a POJO before any annotations were added would return to POJO status if the annotations are removed then it can still be considered a POJO.
A JavaBean is a special kind of POJO that is Serializable, has a no-argument constructor, and allows access to properties using getter and setter methods that follow a simple naming convention.
Read more on Plain Old Java Object (POJO) Explained.
there are mainly three options are possible for mapping purpose
serialize
XML mapping
POJO mapping.(Plain Old Java Objects)
While using the pojo classes,it is easy for a developer to map with the database.
POJO classes are created for database and at the same time value-objects classes are created with getter and setter methods that will easily hold the content.
So,for the purpose of mapping in between java with database, value-objects and POJO classes are implemented.
import java.io.Serializable;
public class Course implements Serializable {
protected int courseId;
protected String courseName;
protected String courseType;
public Course() {
courseName = new String();
courseType = new String();
}
public Course(String courseName, String courseType) {
this.courseName = courseName;
this.courseType = courseType;
}
public Course(int courseId, String courseName, String courseType) {
this.courseId = courseId;
this.courseName = courseName;
this.courseType = courseType;
}
public int getCourseId() {
return courseId;
}
public void setCourseId(int courseId) {
this.courseId = courseId;
}
public String getCourseName() {
return courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
public String getCourseType() {
return courseType;
}
public void setCourseType(String courseType) {
this.courseType = courseType;
}
#Override
public int hashCode() {
return courseId;
}
#Override
public boolean equals(Object obj) {
if (obj != null || obj instanceof Course) {
Course c = (Course) obj;
if (courseId == c.courseId && courseName.equals(c.courseName)
&& courseType.equals(c.courseType))
return true;
}
return false;
}
#Override
public String toString() {
return "Course[" + courseId + "," + courseName + "," + courseType + "]";
}
}
public class UserInfo {
String LoginId;
String Password;
String FirstName;
String LastName;
String Email;
String Mobile;
String Address;
String DOB;
public String getLoginId() {
return LoginId;
}
public void setLoginId(String loginId) {
LoginId = loginId;
}
public String getPassword() {
return Password;
}
public void setPassword(String password) {
Password = password;
}
public String getFirstName() {
return FirstName;
}
public void setFirstName(String firstName) {
FirstName = firstName;
}
public String getLastName() {
return LastName;
}
public void setLastName(String lastName) {
LastName = lastName;
}
public String getEmail() {
return Email;
}
public void setEmail(String email) {
Email = email;
}
public String getMobile() {
return Mobile;
}
public void setMobile(String mobile) {
Mobile = mobile;
}
public String getAddress() {
return Address;
}
public void setAddress(String address) {
Address = address;
}
public String getDOB() {
return DOB;
}
public void setDOB(String DOB) {
this.DOB = DOB;
}
}
File-setting-plugins-Browse repositories
Search RoboPOJOGenerator and install, Restart Android studio
Open Project and right click on package select on Generate POJO from JSON
Paste JSON in dialogbox and select option according your requirements
Click on Generate button
If a class is not bogged down from a framework or a library, then an object created from that class is recognized as a POJO.
Let's see some examples:
class MyServlet extends HttpServlet{
//....
}
The sole meaning of MyServlet class is given by the HttpServlet class. Therefore the objects created from the MyServlet are not POJOs.
class MyClass implements Serializable{
//...
}
The Serializable interface does not give a meaning to the class MyClass. Therefore the objects created from the MyClass are POJOs.