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  • Better type safety in Java collections

    - by Paul Tomblin
    In my java coding, I often end up with several Map<String,Map<String,foo>> or Map<String,List<String>> and then I have trouble remembering which String is which key. I comment the declaration with //Map<capabiltyId,Map<groupId,foo>> or //Map<groupId,List<capabilityId>, but it's not the greatest solution. If String wasn't final, I would make new classes CapabilityId extends String and GroupId extends String, but I can't. Is there a better way to keep track of which thing is the key and maybe have the compiler enforce it?

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  • How to get the last element by date of each "type" in LINQ or TSQL

    - by Mauro
    Imagine to have a table defined as CREATE TABLE [dbo].[Price]( [ID] [int] NOT NULL, [StartDate] [datetime] NOT NULL, [Price] [int] NOT NULL ) where ID is the identifier of an action having a certain Price. This price can be updated if necessary by adding a new line with the same ID, different Price, and a more recent date. So with a set of a data like ID StartDate Price 1 01/01/2009 10 1 01/01/2010 20 2 01/01/2009 10 2 01/01/2010 20 How to obtain a set like the following? 1 01/01/2010 20 2 01/01/2010 20

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  • Castle Windsor - Resolving a generic implementation to a base type

    - by arootbeer
    I'm trying to use Windsor as a factory to provide specification implementations based on subtypes of XAbstractBase (an abstract message base class in my case). I have code like the following: public abstract class XAbstractBase { } public class YImplementation : XAbstractBase { } public class ZImplementation : XAbstractBase { } public interface ISpecification<T> where T : XAbstractBase { bool PredicateLogic(); } public class DefaultSpecificationImplementation : ISpecification<XAbstractBase> { public bool PredicateLogic() { return true; } } public class SpecificSpecificationImplementation : ISpecification<YImplementation> { public bool PredicateLogic() { /*do real work*/ } } My component registration code looks like this: container.Register( AllTypes.FromAssembly(Assembly.GetExecutingAssembly()) .BasedOn(typeof(ISpecification<>)) .WithService.FirstInterface() ) This works fine when I try to resolve ISpecification<YImplementation>; it correctly resolves SpecificSpecificationImplementation. However, when I try to resolve ISpecification<ZImplementation> Windsor throws an exception: "No component for supporting the service ISpecification'1[ZImplementation, AssemblyInfo...] was found" Does Windsor support resolving generic implementations down to base classes if no more specific implementation is registered?

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  • Sending most correct mimetype

    - by Roland Franssen
    Hi all, I have a list of extension to mimetype in a INI file. However some extensions have multiple mimetypes, for example; midi[] = "application/x-midi" midi[] = "audio/midi" midi[] = "audio/x-mid" midi[] = "audio/x-midi" midi[] = "music/crescendo" midi[] = "x-music/x-midi" 6 (possible) mimetypes for 1 extension. Whats common practice to determine the correct mimetype? (e.g. i need to set a HTTP content-type header). I know its not ideal; determining mimetypes based on extension.. but i need consistent (cross-server) results (e.g. fileinfo extension in PHP is making terrible guesses*). * Some fileinfo results for example; js - text/plain css - text/c-h

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  • Volatile or synchronized for primitive type?

    - by DKSRathore
    In java, assignment is atomic if the size of the variable is less that or equal to 32 bits but is not if more than 32 bits. What(volatile/synchronized) would be more efficient to use in case of double or long assignment. like, volatile double x = y; synchronized is not applicable with primitive argument. How do i use synchronized in this case. Of course I don't want to lock my class. so this should not be used.

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  • Gravity Sort : Is this possible programatically?

    - by Bragaadeesh
    Hi, I've been thinking recently on using the Object Oriented design in the sorting algorithm. However I was not able to find a proper way to even come closer in making this sorting algorithm that does the sorting in O(n) time. Ok, here is what I've been thinking for a week. I have a set of input data. I will assign a mass to each of the input data (assume input data a type of Mass). I will be placing all my input data in the space all at same distance from earth. And I will make them free fall. According to gravitational law, the heaviest one hits the ground first. And the order in which they hit will give me the sorted data. This is funny in some way, but underneath I feel that this should be possible using the OO that I have learnt till date Is it really possible to make a sorting technique that uses gravitational pull like scenario or am I stupid/crazy?

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  • how do I update the date type column?

    - by Muhammad Hammad
    update answers a1 set a1.FilingDate=( select date_sub( a2.FilingDate ,Interval 1000 Year) as FilingDate from answers a2 where Year(a2.FilingDate)>=3000 ) where Year(a1.FilingDate)>=3000 but it gives me the following error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'update answers a1 set a1.FilingDate=( select date_sub(a2.FilingDate,Interval 10' at line 1 Can anyone tell me about the issue and its solution?

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  • Getting the version of a COM object

    - by Shao
    I am accessing a .NET COM object from C++. I want to know the version information about this COM object. When I open the TLB in OLEVIEW.exe I can see the version information associated with the coclass. How can I access this information from C++? This is the information I get: [ uuid(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX), version(1.0), custom(XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX, XXXX) ] coclass XXXXXXXX{ [default] interface XXXXXXXX; interface _Object; interface XXXXXXXX; };

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  • Abstract Factory Using Generics: Is Explicitly Converting a Specified Type to Generic a Bad Practice

    - by Merritt
    The question's title says it all. I like how it fits into the rest of my code, but does it smell? public interface IFoo<T> { T Bar { get; set; } } public class StringFoo : IFoo<string> { public string Bar { get; set; } } public static class FooFactory { public static IFoo<T> CreateFoo<T>() { if (typeof(T) == typeof(string)) { return new StringFoo() as IFoo<T>; } throw new NotImplementedException(); } } UPDATE: this is sort of a duplicate of Is the StaticFactory in codecampserver a well known pattern?

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  • Casting and dynamic vs static type in Java

    - by XpdX
    I'm learning about static vs dynamic types, and I am to the point of understanding it for the most part, but this case still eludes me. If class B extends A, and I have: A x = new B(); Is the following allowed?: B y = x; Or is explicit casting required?: B y = (B)x; Thanks!

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  • Binding CoreData Managed Object to NSTextFieldCell subclass

    - by ndg
    I have an NSTableView which has its first column set to contain a custom NSTextFieldCell. My custom NSTextFieldCell needs to allow the user to edit a "desc" property within my Managed Object but to also display an "info" string that it contains (which is not editable). To achieve this, I followed this tutorial. In a nutshell, the tutorial suggests editing your Managed Objects generated subclass to create and pass a dictionary of its contents to your NSTableColumn via bindings. This works well for read-only NSCell implementations, but I'm looking to subclass NSTextFieldCell to allow the user to edit the "desc" property of my Managed Object. To do this, I followed one of the articles comments, which suggests subclassing NSFormatter to explicitly state which Managed Object property you would like the NSTextFieldCell to edit. Here's the suggested implementation: @implementation TRTableDescFormatter - (BOOL)getObjectValue:(id *)anObject forString:(NSString *)string errorDescription:(NSString **)error { if (anObject != nil){ *anObject = [NSDictionary dictionaryWithObject:string forKey:@"desc"]; return YES; } return NO; } - (NSString *)stringForObjectValue:(id)anObject { if (![anObject isKindOfClass:[NSDictionary class]]) return nil; return [anObject valueForKey:@"desc"]; } - (NSAttributedString*)attributedStringForObjectValue:(id)anObject withDefaultAttributes:(NSDictionary *)attrs { if (![anObject isKindOfClass:[NSDictionary class]]) return nil; NSAttributedString *anAttributedString = [[NSAttributedString alloc] initWithString: [anObject valueForKey:@"desc"]]; return anAttributedString; } @end I assign the NSFormatter subclass to my cell in my NSTextFieldCell subclass, like so: - (void)awakeFromNib { TRTableDescFormatter *formatter = [[[TRTableDescFormatter alloc] init] autorelease]; [self setFormatter:formatter]; } This seems to work, but falls down when editing multiple rows. The behaviour I'm seeing is that editing a row will work as expected until you try to edit another row. Upon editing another row, all previously edited rows will have their "desc" value set to the value of the currently selected row. I've been doing a lot of reading on this subject and would really like to get to the bottom of this. What's more frustrating is that my NSTextFieldCell is rendering exactly how I would like it to. This editing issue is my last obstacle! If anyone can help, that would be greatly appreciated.

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  • Passing list and dictionary type parameter with Python

    - by prosseek
    When I run this code def func(x, y, *w, **z): print x print y if w: print w if z: print z else: print "None" func(10,20, 1,2,3,{'k':'a'}) I get the result as follows. 10 20 (1, 2, 3, {'k': 'a'}) None But, I expected as follows, I mean the list parameters (1,2,3) matching *w, and dictionary matching **z. 10 20 (1,2,3) {'k':'a'} Q : What went wrong? How can I pass the list and dictionary as parameters? Added func(10,20, 10,20,30, k='a') seems to be working

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  • Passing Activity to non-activity object properly

    - by rayman
    In my app ive got a non-activity object which it's role is being a manager class. many times i need to pass "source activity" to methods as parameter to that manager class in order to make some operations on that activity. for exaple let's assume we have MyActivity which gotta do some toast. so i have this manager class called MyManager, and i have this method in it raiseToast(Activity sourceActivity) { Toast.makeText(sourceActivity, demo, Toast.LENGTH_LONG).show(); } and from Myactivity class we calling that method this way: MyManager manager=new MyManager(); manager.raitetoast(MyActivity.this); it works fine. what I'm asking here, is this a proper way to pass an Activity as parameter to a non-activity object? I'm having a memory leaks on real device(not the emulator), I wonder if this could also causing any reason for that? Thanks Idan.

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  • Type derivation in python?

    - by aXqd
    In Perl, I can do this: push(@{$h->[x]}, y); Can I simplify the following python codes according to above Perl example? if x not in h: h[x] = [] h[x].append(y) I want to simplify this, because it goes many places in my code, (and I cannot initialize all possible x with []). I do not want to make it a function, because there is no 'inline' keyword. Any ideas?

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  • Release Excel Object In My Destructor

    - by Murat
    Hi all, I'm writing a Excel class using Microsoft.Interropt.Excel DLL. I finish all function but I have an error in my Destructor. I Want to save all changes to my file and I want to release all source. I want to all of them in my destructor. But In my destructor, Excel.ApplicationClass, Workbook and Worksheet objects are fill by an Exception which have message "COM object that has been separated from its underlying RCW cannot be used." So I can't save nothing, close nothing because i can't access workbook or worksheet object. Can't I access the class private members in Destructor?

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  • c++ vector.push_back error: request for member 'push_back'..., which is of non-class type 'vector(ch

    - by Ziplin
    I'm using Cygwin with GCC, and ultimately I want to read in a file of characters into a vector of characters, and using this code #include <fstream> #include <vector> #include <stdlib.h> using namespace std; int main (int argc, char *argv[] ) { vector<char> string1(); string1.push_back('a'); return 0; } generates this compile time error: main.cpp: In function int main(int, char**)': main.cpp:46: error: request for memberpush_back' in string1', which is of non -class typestd::vector ()()' I tried this with a vector of ints and strings as well and they had the same problem.

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  • Using StructureMap, how do you explicitly trigger the reinstantiation of a object with InstanceScope

    - by Mark Rogers
    I have an integration test harness where I want to teardown and then re-instantiate some of the singleton-scoped objects I've registered with StructureMap, after and before each test. This way I can simulate the actual run time environment, but not have the singleton's state being passed from one test to another. Maybe this isn't a great way to do an integration test, but I'm running out of alternative solutions (read open to any advice). So can an object with InstanceScope.Singleton, be re-instantiated? What's the best way to do re-instantiate a singleton-scoped object with StructureMap?

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  • Serializing C# objects to DB

    - by Robert Koritnik
    I'm using a DB table with various different entities. This means that I can't have an arbitrary number of fields in it to save all kinds of different entities. I want instead save just the most important fields (dates, reference IDs - kind of foreign key to various other tables, most important text fields etc.) and an additional text field where I'd like to store more complete object data. the most obvious solution would be to use XML strings and store those. The second most obvious choice would be JSON, that usually shorter and probably also faster to serialize/deserialize... And is probably also faster. But is it really? My objects also wouldn't need to be strictly serializable, because JsonSerializer is usually able to serialize anything. Even anonymous objects, that may as well be used here. What would be the most optimal solution to solve this problem?

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  • How do I copy object in Qt?

    - by Martin
    I'm using Qt and have some real basic problems. I have created my own widget MyTest that have a variable obj. I need to set this variable obj from an object outside of the widget so that the variable is copied not just a pointer to another object. I get an error message and can't figure out how to do this basic stuff. This is the code I'm using: MyTest.h: class MyTest : public QWidget { Q_OBJECT public: void setObj(QObject &inobj); QObject obj; .... } MyTest.cpp: void MyTest::setObj(QObject &inobj) { obj = inobj; //HERE I get the error message: "illegal access from 'QObject' to protected/private member 'QObject::operator=(const QObject &)'" } main.cpp: int main(int argc, char *argv[]) { QApplication a(argc, argv); QObject *ob = new QObject(); MyTest w; w.setObj(*ob); } Thanks for your help!

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  • Detecting the type of iPhone interrupt

    - by Prashant
    I can detect that the iPhone went to sleep and came back from sleep, by using the applicationWillResignActive and applicationDidBecomeActive. But how do I find out what kind of interrupt it was. I am making an audio player application, and need to keep the audio playing when the iPhone goes to sleep (which I know how to do). But I need to interrupt the audio when a message, alarm or low battery interrupt occurs. Also I need to resume the audio when the event is over. So how do I differentiate between these different interrupts.

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  • Encode JSON data into another JSON object

    - by jburns20
    I have a JSON string that I would like to include as a value in a larger JSON object that I am creating from an array. How can I create the larger JSON object without php escaping the string, and without having to decode the previously encoded string? For example, if my JSON string is: $encoded_already = '{"encoded_key": "encoded_value"}'; And I would like to include it in my array and json_encode() it: $new_array = array( "some_other_key" => $some_value, "premade_data" => $encoded_already ); $output = json_encode($new_array); but I want to have the $encoded_already string be included as actual JSON, not just an escaped string.

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  • Using a indentifier or reserved word in a automation object under FPC

    - by Salvador
    Actually i am using OLE automation under Free Pascal , but some objects have properties which uses reserverd words as names, so i cannot compile the code. check this sample MyObj : OleVariant; begin MyObj := CrealeOleObject('AObject'); MyObj .Descriptor := Param1; MyObj .Type := Param2; //this line generates a error this is the error StdOleAux.pas(783,15) Fatal: Syntax error, "identifier" expected but "TYPE" found so the question is how i can access this properties in FPC when they have a name which is a reserved word? FPC 2.2.4 Lazarus 0.9.28.2 using {$MODE DELPHI}

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  • C# Custom data type!

    - by Betamoo
    After I decided at last to implement my Int128 in C#, I thought it would be nice to make it look like other dotNet data types.. But I could not implement the following feature: suffix initialization: such as 13L and 0.2D Can I make my own suffix in C#? And if I can not.. how can I initialize it? i.e Int128 a= ??

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