builder

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 exactly the same way. First problem is most examples hard code property values in to the concrete

Recently I've come across the Builder design pattern. It seems that different authors use "Builder pattern" to refer to different flavours, so let me describe the pattern I'm asking about. We have an algorithm for creating products , i.e., objects of different types. At a sufficiently high level of abstraction the algorithm is the same for all product types, but each product type requires a different implementation of each of the algorithm's abstract steps. For example, we might have the following cake-baking algorithm: 1. Add liquids. 2. Mix well. 3. Add dry ingredients. 4. Mix well. 5. Pour

I'd like to have an AlertDialog builder that only has one button that says OK or Done or something, instead of the default yes and no. Can that be done with the standard AlertDialog, or would I have to use something else? Will Tate Couldn't that just be done by only using a positive button? AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("Look at this dialog!") .setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { //do things } }); AlertDialog alert = builder.create(); alert

I'm trying to install Rails 3 on a new OS X Snow Leopard machine (with dev tools installed), and when I sudo gem install rails , I get the following error: ERROR: While executing gem ... (Gem::FormatException) builder-2.1.2 has an invalid value for @cert_chain And the update fails. Has anyone seen this before? I grep ed the builder-2.1.2 directory for 'cert_chain,' but couldn't find any clues. Ruby version is 1.8.7 OS X 10.6.6 Thanks! user688525 This is an issue with Rubygems version 1.7.1. Upgrading to 1.7.2 or above, or downgrading to 1.6.2, fixes this. To upgrade (preferred): gem update -

This might be quite easy but have no idea how to. I have a table that can have repeated values for a particular non-key column field. How do I write a SQL query using Query Builder or Eloquent that will fetch rows with distinct values for that column? Note that I am not fetching that column only, it is in conjunction with other column values, so distinct() might not really work. So that question basically can be how to specify the column that I want to be distinct in a query now that distinct() accepts no parameters? You should use groupby . In Query Builder you can do it this way: $users = DB

I have a simple task of accessing the values of some attributes. This is a simple script that uses Nokogiri::XML::Builder to create a simple XML doc. require 'nokogiri' builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml| xml.Placement(:messageId => "392847-039820-938777", :system => "MOD", :version => "2.0") { xml.objects { xml.object(:myattribute => "99", :anotherattrib => "333") xml.nextobject_ '9387toot' xml.Entertainment "Last Man Standing" } } end puts builder.to_xml puts builder.root.attributes["messageId"] The results are: <?xml version="1.0" encoding="UTF-8"?>