builder

Can someone suggest me how to build up the following query using JPA Criteria builder API? SELECT id,status,created_at from transactions where status='1' and currency='USD' and appId='123' order by id It's better if I can find a solution which creates dynamically based on the parameters given as a Map<String,String> using metamodel classes or any other way. It's like this (without metamodel): Map<String, Object> params = ...; CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Tuple> cq = cb.createTupleQuery(); Root<Transaction> r = cq.from(Transaction.class); Predicate p= cb

From When would you use the Builder Pattern? , It is said that builder pattern is appropriate for Pizza example. Why not Decorator ? by treating Cheese, Pepperoni, Bacon as additional decorations on a base pizza. Is it for the reason that Cheese/Pepperoni have to be built seperately. I don't think, they need to be built seperately as they can be available readymade. Pls clarify. Am also looking for a good real-world example of decorator pattern and reason why it is the apt for that particular example. Thank you. From wikipedia's decorator pattern article: In object-oriented programming, the

Often I find it tedious to implement the builder pattern with pre-java-8 setups. There is always lots of nearly duplicated code. The builder itself could be considered boilerplate. In fact there are code duplicate detectors , that would consider nearly each method of a builder made with pre-java-8 facilities as a duplicate of every other method. So considering the following class and it's pre-java-8 builder: public class Person { private String name; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age

I was wondering what would be the best way to implement a .When condition in a fluent interface using method chaining in a Builder object? For instance how would I implement the .WithSkill() and .When() methods in the following example: var level = 5; var ninja = NinjaBuilder .CreateNinja() .Named("Ninja Boy") .AtLevel(level) .WithShurikens(10) .WithSkill(Skill.HideInShadows) .When(level > 3) .Build() Update - A sample solution can be found here . What I'd do is have NinjaBuilder keep the operations as a list of delegates, rather than applying them, and only apply them when .Build is called.

I would like to know how do I populate a TableView with data... All the examples I have seen creates a TableView with columns and everything and add it to the scene. All done in the java code itself. What I want to know: if I design my "form" in JavaFx Scene builder. Defining all the tables and columns in there. How do I access it to populate it from java? Or if someone can point me to a proper tutorial on this please. I have defined my form in JavaFx Scene Builder - only a TableView with 3 Columns <?xml version="1.0" encoding="UTF-8"?> <?import java.lang.*?> <?import java.util.*?> <?import

In Kotlin, I want to add extension methods to a class, for example to class Entity . But I only want to see these extensions when Entity is within a transaction, otherwise hidden. For example, if I define these classes and extensions: interface Entity {} fun Entity.save() {} fun Entity.delete() {} class Transaction { fun start() {} fun commit() {} fun rollback() {} } I now can accidentally call save() and delete() at any time, but I only want them available after the start() of a transaction and no longer after commit() or rollback() ? Currently I can do this, which is wrong: someEntity.save()

For the past few days, I haven't been able to solve an issue with my dialog box. I am running a thread to show the dialog box for 5000ms and removing it. and I am trying to show a toast("SUCCESS"). The problem is I am getting the dialog box for the second time also. I am new to android development and I need to solve this with Async Task so that I can delay the second thread and show a alert dialog.builder with a positive button instead of toast. I goggled a lot but I confused to to implement this Here I am sending my credentials to server and while sending I am showing a progress dialog box

I have an object hierarchy that increases in complexity as the inheritance tree deepens. None of these are abstract, hence, all of their instances serve a, more or less sophisticated, purpose. As the number of parameters is quite high, I would want to use the Builder Pattern to set properties rather than code several constructors. As I need to cater to all permutations, leaf classes in my inheritance tree would have telescoping constructors. I have browsed for an answer here when I hit some problems during my design. First of, let me give you a simple, shallow example to illustrate the problem