All Questions
Tagged with builder-pattern design-patterns
42 questions
2
votes
1
answer
136
views
For N and NBuilder, should N be an instance variable of NBuilder, or all parameters of N be instance variables of NBuilder,finally new N() in build()?
As far as I know about builder pattern, for example, an object, Student:
public class Student{
private String name;
private int age;
//setter and getter
}
to apply builder pattern to ...
- 2,983
5
votes
6
answers
2k
views
Is it a good idea to return a Builder from a Factory?
I would want to have a builder for creating a complex object, for example Employee.
I would want to be able to create my objects in two ways:
Case 1. Get Employee with default values
Case 2. Get ...
- 221
3
votes
1
answer
248
views
GOF class diagram for Builder pattern appears to contradict its corresponding sequence diagram
In the Design Patterns: Elements of Reusable Object Oriented Software, the Gang of Four present the following canonical form for the Builder pattern:
In Appendix B the following is mentioned ...
- 267
3
votes
3
answers
471
views
How to efficiently build objects without default constructors
I am trying to explain and understand a way to create object which cannot have "default" instances. Typically I want classes which represent, as closely as possible, the real-life concept I ...
- 789
-1
votes
1
answer
218
views
How can I use builders for products with incompatible interfaces?
I am working on a program to automatically design heater units based on varying client specifications.
The process for creating each heater is quite involved and requires multiple optional steps ...
- 97
1
vote
1
answer
717
views
Builder design pattern when creating object between many layers
I stumbled on following problem, and I'm curious if it could be done better.
A while ago I wrote a factory class that looked something like this:
public class Foo
{
private IDbContext ...
- 27
-1
votes
3
answers
293
views
Design pattern for creating and scheduling tests/exams
I have an Exam class that represents an examination/test:
public class Exam
{
public int Id { get; set; }
[Required]
[StringLength(maximumLength: 30, MinimumLength = 1]
public string ...
- 111
5
votes
2
answers
431
views
GoF Builder Pattern Applicability
The book Design Patterns: Elements of Reusable Object-Oriented Software says to use the builder pattern when
The algorithm for creating a complex object should be independent of the
parts that make ...
- 161
2
votes
2
answers
955
views
Builder Pattern: Is there any advantage of having instance variables + product reference instead of just product reference?
Consider the product class:
class Car {
private String color;
private String model_num;
//getters and setters for the above fields
}
Consider builder class 1:
class CarBuilder1 {
private ...
- 139
1
vote
1
answer
81
views
Can a GoF Builder implementation be considered valid without an explicit getProduct()?
For studying purpose, I've tried to create a simple PHP implementation of Builder GoF (not the Joshua Bloch's one) inspired on this slide.
The main goal of this example is to encapsulate the ...
- 253
7
votes
3
answers
6k
views
Design pattern: How to inject dependencies into a Command pattern
I am pretty new to programming languages and only have limited knowledge about design patterns, so I hope you can help me with the following problem:
I have an application that operates on a group of ...
- 91
2
votes
2
answers
3k
views
Builder Pattern: Is it acceptable to use "passing-by-reference" on Director methods?
For teaching purposes, I am trying to create a PHP implementation of a conceptual example of Builder Pattern:
First of all, some products:
class Product1 {
private string $attribute1;
...
- 253
0
votes
3
answers
4k
views
Builder Pattern - Must it be part of The same Class?
For complex object creation, I am quite fond of Builder Pattern. My 1st question is "Do I need the Builder to be inside my complex class blueprint, or Could I actually have it outside?"
e.g. Are the ...
- 397
2
votes
2
answers
2k
views
Creational design pattern that allows configuration of objects
With the factory pattern we abstract the creation of objects. But what if we need a specific configuration of an object that depends on the calling context?
Example:
So I have a Builder pattern for ...
- 359
0
votes
1
answer
650
views
how to use Builder pattern combined with protected access modifier?
I'm reading a book in Design Patterns, and below is some code example used by the author. The author tries to build a html builder as (code in C#):
public class HtmlElement
{
public string Name, ...
- 127