builder-pattern

问题 I have recently learned Joshua Bloch's builder pattern for creating objects with many optional fields. I've been using something like it for years, but never used an inner-class until Bloch's book suggested it to me. I love it. I understand that another thread may alter the bulider's configuration, before it's actually built (with build() ), such that it may be necessary to re-validate all values in the constructor of the enclosing class. Below is an example of a builder class that optionally

问题 I have recently learned Joshua Bloch's builder pattern for creating objects with many optional fields. I've been using something like it for years, but never used an inner-class until Bloch's book suggested it to me. I love it. I understand that another thread may alter the bulider's configuration, before it's actually built (with build() ), such that it may be necessary to re-validate all values in the constructor of the enclosing class. Below is an example of a builder class that optionally

问题 I am trying to make a query builder for GraphQL syntax, by using a builder pattern. I already did it for the filtering part: I want to programatically make a way to say what data I want to get back from the query. (NOTE: before the title part of the query was hardcoded into the QueryBuilder. So for that I made a class called Entity which has a list of itself as an attribute. class Entity( private val entity: EntityType, private val entities: MutableList<Entity> = mutableListOf() ) { override

问题 This is a followup question on another question I asked yesterday. How can I build a nested list using builder pattern? Credit to: Pelocho for giving nice answer. I used this Tutorial to do a type safe graphQL query builder: What I want to do now is to simplify what I made And I know that kotlin must have some nice features to do that. Right now I have to invoke functions when I want to add an entity to my query: fun main() { events{ title() // I don't like to do () when it is an edge case }

来源： https://stackoverflow.com/questions/10348491/builder-pattern-code-generation-in-intellij

问题 The Builder implements Cloneable and overrides clone() and instead of copying every field of the builder, the immutable class keeps a private clone of the builder. This makes it easy to return a new builder and create slightly modified copies of an immutable instance. This way I can go MyImmutable i1 = new MyImmutable.Builder().foo(1).bar(2).build(); MyImmutable i2 = i1.builder().foo(3).build(); The Cloneable interface is said to be somewhat broken, but does any of this violate good java

问题 The builder pattern is popular to create immutable objects, but there is some programming overhead to create a builder. So I wonder why not simply using a config object. The usage of a builder would look like this: Product p = Product.Builder.name("Vodka").alcohol(0.38).size(0.7).price(17.99).build(); It is obvious that this is very readable and concise, but you have to implement the builder: public class Product { public final String name; public final float alcohol; public final float size;

问题 I have two types of payload coming from upstream: It's either PayloadA or PayloadB . There are some common fields between PayloadA and PayloadB so I created Payload class with those common fields and for rest I created two builder class one for each payload. Below is the builder class for PayloadA : public final class PayloadA { private final String clientId; private final String langid; private final String deviceId; private final Map<String, String> applicationPayload; private PayloadA

问题 I recently started using Builder pattern in one of my projects and I am trying to add some sort of validations on my Builder class. I am assuming we cannot do this at compile time so that's why I am doing this validation at runtime. But may be I am wrong and that's what I am trying to see whether I can do this at compile time. Traditional builder pattern public final class RequestKey { private final Long userid; private final String deviceid; private final String flowid; private final int

问题 Based on the following examples, its possible to write a build-pattern with chained method calls in Rust which either passes by value or by reference (with a lifetime specifier) Is it possible to create a macro to implement builder pattern methods? How to overload the 'new' method? (top answer) https://github.com/rust-unofficial/patterns/blob/master/patterns/builder.md A builder pattern in Rust may look something like this: ui::Button::new() .label("Test") .align(Align::Center) .build(); When