builder

问题 I have started reading Joshua Bloch's "Effective Java" (second edition). While reading item 2 ( Consider a builder when faced with many constructor parameters ), there is a particular statement that the author makes w.r.t the Class.newInstance() method. Specifically, the author says that The traditional Abstract Factory implementation in Java has been the "Class" object, with the "newInstance" method playing the part of the "build" method. This part has me confused a little bit - my

问题 Does anyone have any suggestions on how to make a AdWhirl banner in interface builder? Right now I use this code to make a banner: AdWhirlView *awView = [AdWhirlView requestAdWhirlViewWithDelegate:self]; [self.view addSubview:awView]; awView.frame = CGRectMake(0, 361, kAdWhirlViewWidth, kAdWhirlViewHeight); I've tried to make a UIView and making an IBOutlet to it and making it's class a AdWhirlView but I can't seem to get it right... Thanks 回答1: Here is the code that I use with IB: In

问题 UPDATED!! Breaking down the question as suggested. I need to create a Look & Feel for a search application I need to have the components displayed on the left hand side and on the right I can drag-and-drop them and enter the data for the search criteria If there are more than one condition I would like to drag and drop the condition Finally I need to save/edit/open existing query I am looking to build a query builder with drag and drop facility to build the query. I was wondering if there are

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 7 months ago . What would be the disadvantages of using the builder design pattern. Are there any?? edit - I want to know whether there is any bad consequence of using builder design pattern? As in the GOF book, they have mentioned the good and bad consequences of design patterns. But they

问题 What is the best practice for using Builder pattern in "deep" object hierarchies? To elaborate, I explored the idea of applying the Builder pattern as proposed by Joshua Bloch, to my XML binding code (I am using SimpleXML but this question would apply to any case). My object hierarchy is 4 levels deep, with various degree of complexity. By that, I mean, in some levels I have just a couple of properties for my objects, whereas at some other levels I have up to 10. So consider this hypothetical

问题 I'm trying to have an abstract base class for some builder classes so I can easily reuse code between the Builder implementations. I want my builders to support method chaining therefore a method has to return "this" instance of the most specific type. I figured I could probably do this with generics. Unfortunatly I did not manage to do it without using unsafe operations. Is it possible? Sample code of how I'm trying it (and how it works) below. I'd like to avoid casting to T in "foo()"

问题 it's a WHY-question, not How-to one:) I have assigned a Query Bulder to a variable $query: $query = table::where(['id'=>1, 'this_version'=> 1]); $versions['slug1'] = $query->select('tourist_id', 'tourist_version')->get()->toArray(); print_r($versions); outputs array with 2(!) sub-arrays: Array ( [slug1] => Array ( [0] => Array ( [tourist_id] => 1 [tourist_version] => 1 ) [1] => Array ( [tourist_id] => 2 [tourist_version] => 1 ) ) ) But if I add another line using $query between my $query

问题 I am learning about the builder pattern, and so far I understood that, it is a great alternative to the commonly patterns used for initialization: Telescoping Constructor Pattern JavaBean Pattern The thing is, I don't really like to remove the getters and setters from the objects in my domain model. I always like to keep them as POJOs. One of the reasons I don't like it is: If i don't use POJOs, then it is not easy to annotate the variables when using ORM frameworks... So here are my doubts:

问题 I have a builder class which I am using in one of my project. Let's say I have metricA as builder based on below class. I need to make a new builder metricB based on metricA by cloning metricA so that metricB contains all the values which were already there in metricA . In the constructor of MetricHolder I am initializing some fields (which are not set directly) basis on fields that have been set already. clientTypeOrPayId - I am initializing this field. If payId is present, then I will set

问题 I have looked for a good example of a Builder pattern (in C#), but cannot find one either because I don't understand the Builder pattern or I am trying to do something that was never intended. For example, if I have an abstract automobile and abstract builder methods to create car parts, I should be able to send all 30 of my choices to the Director, have it build the pieces I need, then build my automobile. Regardless of which car, truck, semi, etc. produced, I should be able to "drive" it in