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  • Design pattern: polymorphisim for list of objects

    - by ziang
    Suppose I have a class A, and A1, A2 inherits from A. There are 2 functions: List<A1> getListA1(){...} List<A2> getListA2(){...} Now I want to do something similar to both A1 and A2 in another function public void process(List<A>){...} If I want to pass the instance of either ListA1 or ListA2, of course the types doesn't match because the compiler doesn't allow the coercion from List< A1 to List< A. I can't do something like this: List<A1> listA1 = getListA1(); List<A> newList = (List<A>)listA1; //this is not allowed. So what is the best approach to the process()? Is there any way to do it in a universal way rather than write the similar code to both List and List?

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  • Dynamically Specify Linked Server and DB Names in Stored Procedure

    - by hgulyan
    I have the same query in a stored procedure that needs to be executed on different servers and databases according to parameters. How can I arrange this without exec or sp_executesql? I'm using SQL Server 2008. Thank you. UPDATE I've found some links http://www.eggheadcafe.com/software/aspnet/29397800/dynamically-specify-serve.aspx http://www.sommarskog.se/dynamic_sql.html Is using SYNONYM possible solution? If yes, than how? UPDATE 2 I forgot to mention that all this servers are linked to the server where stored procedure is stored.

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  • In C# how can I serialize a List<int> to a byte[] in order to store it in a DB field?

    - by Matt
    In C# how can I serialize a List to a byte[] in order to store it in a DB field? I know how to serialize to a file on the disk, but how do I just serialize to a variable? Here is how I serialized to the disk: List<int> l = IenumerableofInts.ToList(); Stream s = File.OpenWrite("file.bin"); BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(s, lR); s.Close(); I'm sure it's much the same but I just can't wrap my head around it.

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  • make a tree based on the key of each element in list.

    - by cocobear
    >>> s [{'000000': [['apple', 'pear']]}, {'100000': ['good', 'bad']}, {'200000': ['yeah', 'ogg']}, {'300000': [['foo', 'foo']]}, {'310000': [['#'], ['#']]}, {'320000': ['$', ['1']]}, {'321000': [['abc', 'abc']]}, {'322000': [['#'], ['#']]}, {'400000': [['yeah', 'baby']]}] >>> for i in s: ... print i ... {'000000': [['apple', 'pear']]} {'100000': ['good', 'bad']} {'200000': ['yeah', 'ogg']} {'300000': [['foo', 'foo']]} {'310000': [['#'], ['#']]} {'320000': ['$', ['1']]} {'321000': [['abc', 'abc']]} {'322000': [['#'], ['#']]} {'400000': [['yeah', 'baby']]} i want to make a tree based on the key of each element in list. result in logic will be: {'000000': [['apple', 'pear']]} {'100000': ['good', 'bad']} {'200000': ['yeah', 'ogg']} {'300000': [['foo', 'foo']]} {'310000': [['#'], ['#']]} {'320000': ['$', ['1']]} {'321000': [['abc', 'abc']]} {'322000': [['#'], ['#']]} {'400000': [['yeah', 'baby']]} perhaps a nested list can implement this or I need a tree type?

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  • Is there an easy way to copy an iterator into a list in Java?

    - by Space_C0wb0y
    I want something like this: public void CopyIteratorIntoList(Iterator<Foo> fooIterator) { List<Foo> fooList = new ArrayList<Foo>(); fooList.addAll(fooIterator); } which should be equivalent to: public void CopyIteratorIntoList(Iterator<Foo> fooIterator) { List<Foo> fooList = new ArrayList<Foo>(); while(fooIterator.hasNext()) fooList.add(fooIterator.next()); } Is there any method in the API to achieve that, or is this the only way?

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  • Design pattern: Polymorphism for list of objects

    - by ziang
    Suppose I have a class A, and A1, A2 inherits from A. There are 2 functions: List<A1> getListA1(){...} List<A2> getListA2(){...} Now I want to do something similar to both A1 and A2 in another function public void process(List<A>){...} If I want to pass the instance of either ListA1 or ListA2, of course the types doesn't match because the compiler doesn't allow the coercion from List< A1 to List< A. I can't do something like this: List<A1> listA1 = getListA1(); List<A> newList = (List<A>)listA1; //this is not allowed. So what is the best approach to the process()? Is there any way to do it in a universal way rather than write the similar code to both List and List?

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  • Connection Timeout Linked Server

    - by Wade73
    I have created a linked server from one SQL Server 2005 to Another 2005. When I run an update query through the SQL Server Management Studio (SSMS), it runs in under a second. If I run the query through a asp webpage it times out. I ran SQL Profiler to see if I noticed anything as well as the Activity Monitor in SSMS and all I found was that a lock was being created (Wait type LOCK_M_U), but I can't find what is locking it. Any help would be appreciated. Wade

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  • Any way to make a generic List where I can add a type AND a subtype?

    - by user383178
    I understand why I cannot do the following: private class Parent { }; private class Child extends Parent { }; private class GrandChild extends Child { }; public void wontCompile(List<? extends Parent> genericList, Child itemToAdd) { genericList.add(itemToAdd); } My question is there ANY practical way to have a typesafe List where you can call add(E) where E is known to be only a Parent or a Child? I vaguely remember some use of the "|" operator as used for wildcard bounds, but I cannot find it in the spec... Thanks!

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  • How can I convert this string to list of lists?

    - by Phrixus
    Hi, what I'm trying to do is.. if a user types in [[0,0,0], [0,0,1], [1,1,0]] and press enter, the program should convert this string to several lists; one list holding [0][0][0], other for [0][0][1], and the last list for [1][1][0] I thought tuple thing would work out but no luck... :( I started phython yesterday -- (I'm C / C++ guy.) and cannot use the full advantages of this language... Does python have a good way to handle this? I need help~ :'(

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  • How do I put unordered list items into an array

    - by Clint
    Hi, My code is... How do I get the text in each list item into an array using native javascript? <ul id="list"> <li>List Item 1</li> <li>List Item 2</li> <li>List Item 3</li> <li>List Item 4</li> </ul> <script type="text/javascript"> var list = document.getElementById('list').childNodes.TextNode; for(var i=0;i < list.length; i++) { var arrValue = list[i]; alert(arrValue); } </script> Many thanks.

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  • How can I check if a value is in a list in Perl?

    - by ablimit
    I have a file in which every line is an integer which represents an id. What I want to do is just check whether some specific ids are in this list. But the code didn't work. It never tells me it exists even if 123 is a line in that file. I don't know why? Help appreciated. open (FILE, "list.txt") or die ("unable to open !"); my @data=<FILE>; my %lookup =map {chop($_) => undef} @data; my $element= '123'; if (exists $lookup{$element}) { print "Exists"; } Thanks in advance.

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  • How do I make a recursive list that checks company rankings?

    - by Sera
    I have a set of companies in rank order. I want my rule to check if the companies in a specified list are in rank order, and for the rule to recur until all companies in the list have been checked. I currently have the following: isOrder([]). isOrder([COM1,COM2|T]) :- rank(COM1,D), rank(COM2,E), D<E, print("in order"), isOrder([COM2|T]). However, this does not seem to work. Sometimes, the recursion goes on forever without ending, and sometimes the recursion doesn't work at all. This is when I vary the code to try and get the correct answer. Can anybody help me? I have just started Prolog and my understanding of it is severely limited. Any help would be greatly appreciated.

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  • Mutation Problem - Clojure

    - by Silanglaya Valerio
    having trouble changing an element of my function represented as a list. code for random function: (defn makerandomtree-10 [pc maxdepth maxwidth fpx ppx] (if-let [output (if (and (< (rand) fpx) (> maxdepth 0)) (let [head (nth operations (rand-int (count operations))) children (doall (loop[function (list) width maxwidth] (if (pos? width) (recur (concat function (list (makerandomtree-10 pc (dec maxdepth) (+ 2 (rand-int (- maxwidth 1))) fpx ppx))) (dec width)) function)))] (concat (list head) children)) (if (and (< (rand) ppx) (>= pc 0)) (nth parameters (rand-int (count parameters))) (rand-int 100)))] output )) I will provide also a mutation function, which is still not good enough. I need to be able to eval my statement, so the following is still insufficient. (defn mutate-5 "chooses a node changes that" [function pc maxwidth pchange] (if (< (rand) pchange) (let [output (makerandomtree-10 pc 3 maxwidth 0.5 0.6)] (if (seq? output) output (list output))) ;mutate the children of root ;declare an empty accumulator list, with root as its head (let [head (list (first function)) children (loop [acc(list) walker (next function)] (println "----------") (println walker) (println "-----ACC-----") (println acc) (if (not walker) acc (if (or (seq? (first function)) (contains? (set operations) (first function))) (recur (concat acc (mutate-5 walker pc maxwidth pchange)) (next walker)) (if (< (rand) pchange) (if (some (set parameters) walker) (recur (concat acc (list (nth parameters (rand-int (count parameters))))) (if (seq? walker) (next walker) nil)) (recur (concat acc (list (rand-int 100))) (if (seq? walker) (next walker) nil))) (recur acc (if (seq? walker) (next walker) nil)))) ))] (concat head (list children))))) (side note: do you have any links/books for learning clojure?)

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  • A list of game mechanics

    - by Iain
    I'm trying to compile a list of game mechanics, by which I mean high-level/meta game mechanics like Cooperation, Resource Management, Chance and Time Manipulation rather than low level mechanics like running, jumping climbing ladders, etc Does any one have any suggestions or can point me to good existing lists? My WIP list is already proving to be quite useful to me in the way I think about games.

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  • Command-line to list DNS servers

    - by Anurag Uniyal
    Is there a command to list dns servers? I tried $ cat /etc/resolv.conf # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 127.0.0.1 $ cat /etc/network/interfaces # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback But it doesn't list any servers, if I go to "Network GUI Tool", in Wireless section it lists "DNS 192.168.1.1 8.8.8.8 8.8.4.4" Can I get same information from command line? I am using Ubuntu 12.04 LTS

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  • List of usage information to collect in a web application

    - by Thomas Levine
    I'm writing a web application that will allow people to create accounts, edit stuff, send stuff to people, &c. I plan on recording things like when things were created and sent and stuff. Is there a list of usage information that one should collect in a web application? I'd like to see whether I'm missing something. Also, is there a list of usage information that I shouldn't collect (Like maybe information that people find private)?

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  • Where can I download list of all .com domains registered in the world

    - by John
    I just need registered .com domain names. I know this list is available at: http://www.verisigninc.com/en_US/products-and-services/domain-name-services/grow-your-domain-name-business/tld-zone-access/index.xhtml ( looks like it could take 4 weeks for approval) http://www.premiumdrops.com/zones.html Also I can extract domain names using domain search API at domaintools.com Is there any other source where I can find this list?

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  • Deserialize inherited classes into the same list in XNA

    - by M0rgenstern
    I am writing a Gui for a game (for what else ...). Therefor I wrote a class GuiElement which has some serializeable fields. From this class I deflect a Class "Button" which has one serializeable field more. Furthermore, I have a Class GuiWindow, which is as well deflected from "GuiElement". An Object of this Class has a Field "HandledElements" of the type "List". To know the layout of the Menues, I use XML-Files, which look like that (for example): <?xml version="1.0" encoding="utf-8" ?> <XnaContent xmlns:Generic="System.Collections.Generic"> <Asset Type="System.Collections.Generic.List[GUI.GuiWindow]"> <Item> <Position>0 0</Position> <AlternativeImagePath></AlternativeImagePath> <IsActive>true</IsActive> <Name>MainMenu</Name> <HandledElements> <Item> <Position>100 100</Position> <AlternativeImagePath></AlternativeImagePath> <IsActive>true</IsActive> <Name>Optionen</Name> <Caption>Optionen</Caption> </Item> </HandledElements> </Item> <Item> <Position>0 0</Position> <AlternativeImagePath></AlternativeImagePath> <IsActive>false</IsActive> <Name>Options</Name> <HandledElements> </HandledElements> </Item> </Asset> </XnaContent> As you can see, the first window has in its "HandledElements" List an Item with the Field . This is a field which only a Button has. The Problem is now: I can't deserialize this XML file, because GuiElement does not have this Field, it only has the few fields above. I thought it would know automatically which Class to use,but it doesn't. Do I really have to give my windows a list for each child class of GuiElement? Or can I do another workaround?

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  • The Science of Creating a Money Making Keyword List

    Creating a money making keyword list is the foundation of your website marketing strategy. If your keyword list contains the right words or phrases then you will see plenty of traffic finding your site. If the keywords are not specific enough or are too general then your traffic will suffer and those that do happen to find your site may just look around a second or two and then move on.

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  • How to programmatically fetch a list of applications from the Software Center

    - by David Planella
    Im writing a PyGI app where I'd like to show a list of matching applications from the Ubuntu Software Centre in an auto-completion text entry or dropdwon. I haven't yet figured out the best way to present the information, I just want to make it easier for the user to type the name of an application. But before that, I'd like to figure out how to get the data. Is there an API to get a list of all applications from the Software Centre, or indirectly through the Applications Dash in Unity?

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  • The Science of Creating a Money Making Keyword List

    Creating a money making keyword list is the foundation of your website marketing strategy. If your keyword list contains the right words or phrases then you will see plenty of traffic finding your site. If the keywords are not specific enough or are too general then your traffic will suffer and those that do happen to find your site may just look around a second or two and then move on.

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  • Extend gnome-control-center’s list of keyboard layouts

    - by MPi
    While looking for my problem of Keyboad layout: In 13.10, modified symbols do not apply, I noticed that gnome-control-center region layouts has a list of keyboard layouts that is not directly related to the ones found in /usr/share/X11/xkb/symbols. For example, on my German machine it lists ‘Englisch (Colemak)’ and ‘English (Britisch, Colemak)’ as keyboard layouts, both are not found in the original files, but obviously translations. So, my question is: Where does gnome-control-center get its list of keyboard layouts from? Can it be extended?

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  • Top10 List before Migrating to the Cloud

    - by Webgui
    Everybody's talking about putting their apps on the Cloud these days. But what do they really need to know when considering such a project?! Chevy (Fleischman) Weiss & Itzik Spitzen of Visual WebGui have put together a list of the 10 most important things you need to know and check before you start migrating your apps to the Cloud. Read the list >

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  • List of events triggered on pages matching regex

    - by Cubius
    Is there a way to get the grouped list of events (such as in Top events) which were triggered on pages matching a regular expression? I may add the Page secondary dimension in Top events and apply the regex filter but this way I won't get a grouped list. I may apply the filter to Events - Pages report but this way the events will be grouped only inside pages whilst I need global grouping. Any suggestions?

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