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• Help me with a solution for what could be solutioned by virtual static fields... in FPC

  - by Gregory Smith

  Hi I'm doing an event manager in Freepascal Each event is an object type TEvent (=object), each kind of event must derive from this class. Events are differentiated by an integer identificator, assigned dynamically. The problem is that i want to retrieve the event id of an instance, and i can't do it well. All instances of a class(object) have a unique id = so it should be static field. All classes have a diferent id = so it should be virtual. Event ids are assignated in run time, and can change = so it can't be a simple method In sum, I can't put all this together. I'm looking for an elegant solution, i don't want to write a hardcoded table, actualizing it in every constructor... etc, i'd prefer something taking advantage of the polymorphism Can anyone help me with another technical or design solution? I remark I don't want to use class instead of object construct.(property doesn't work on objects? :(

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• Casting To The Correct Subclass

  - by kap

  Hi Guys I hava a supeclass called Car with 3 subclasses. class Ford extends Car{ } class Chevrolet extends Car{ } class Audi extends Car{ } Now i have a function called printMessge(Car car) which will print a message of a particular car type. In the implementation i use if statements to test the instance of the classes like this. public int printMessge(Car car){ if((Ford)car instanceof Ford){ // print ford }else if((Chevrolet)car instanceof Chevrolet){ // print chevrolet }else if((Audi)car instanceof Audi){ // print Audi } } for instance if i call it for the first time with Ford printMessge(new Ford()), it prints the ford message but when i call it with printMessge(new Chevrolet()), i get EXCEPTION from the first if statement that Chevrolet cannot be cast to Ford. What am i doing wrong and what is the best way. thanks

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• How to get the ObjectId value from MongoDB?

  - by LVarayut

  I'm using Jongo with Play framework 2, java. I added some data into my MongoDB. {"_id" : ObjectId("538dafffbf6b562617252178"), ... } However, when I fetched the ObjectId from the database, it gave me like: de.undercouch.bson4jackson.types.ObjectId@484431ff instead of 538dafffbf6b562617252178. I don't quite understand how can I get the ObjectId value. My class is defined as following: public class Product { @JsonProperty("_id") protected String id; ... public Product() { } public String getId() { return id; } public void setId(String id) { this.id = id; } } EDIT In order to fetch the data, I simply use find() function provided by Jongo as following: public static Iterable<Product> findAll(){ return products().find().as(Product.class); }

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• Add a DoubleClickHandler to a FixedWidthGrid

  - by MArio

  Hello so I got a FixedWidthGrid table which is made from a pagingtable FixedWidthGrid dataTable = x.getDataTable(); I could add alot of handlers to the dataTables rows like selected or sort policies. but I cant add a double click handler ... anyway idea's ?! thank you I do have a class which I made to try to add a double click hander but it didn't work. class: public class DoubleClickTable extends FixedWidthGrid implements HasDoubleClickHandlers { public DoubleClickTable() { super(); } public HandlerRegistration addDoubleClickHandler(DoubleClickHandler handler) { return addDomHandler(handler, DoubleClickEvent.getType()); } } Thank you so much for your help.

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• Fluent NHibernate - Unable to parse integer as enum.

  - by Aaron Smith

  I have a column mapped to an enum with a convention set up to map this as an integer to the database. When I run the code to pull the data from the database I get the error "Can't Parse 4 as Status" public class Provider:Entity<Provider> { public virtual Enums.ProviderStatus Status { get; set; } } public class ProviderMap:ClassMap<Provider> { public ProviderMap() { Map(x => x.Status); } } class EnumConvention:IUserTypeConvention { public void Accept(IAcceptanceCriteria<IPropertyInspector> criteria) { criteria.Expect(x => x.Property.PropertyType.IsEnum); } public void Apply(IPropertyInstance instance) { instance.CustomType(instance.Property.PropertyType); } } Any idea what I'm doing wrong?

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• Instantiating a context in LINQ to Entities

  - by Jagd

  I've seen two different manners that programmers approach when creating an entity context in their code. The first is like such, and you can find it all over the MSDN code examples: public void DoSomething() { using TaxableEducationEntities context = new TaxableEducationEntities()) { // business logic and whatever else } } The second is to create the context as a private attribute in some class that encapsulates your business logic. So you would have something like: public class Education_LINQ { private TaxableEducationEntities context = new TaxableEducationEntities(); public void DoSomething() { var result = from a in context.luAction select a; // business logic and whatever else } } Which way is more efficient? Assume that you have two methods, one called DoSomething1() and another called DoSomething2(), and both methods incorporate the using statement to open the context and do whatever with it. Were you to call one method after the other, would there be any superfluous overhead going on, since essentially both methods create the context and then clean it up when they're done? As opposed to having just one private attribute that is created when a class object is instantiated, and then in turn cleaned up when the object goes out of scope?

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• How to make a structure map powered viewengine in asp.net mvc

  - by Andrew Bullock

  My views extend a base view class ive made: public class BaseView : ViewPage At the moment im calling ObjectFactory.GetInstance inside this class' constructor to get some interface implementations but id like to use structuremap to inject them as constructor arguments. Im using a structuremapcontrollerfactory to create my controllers, but how can i do the same for views? I know i can implement a custom ViewEngine, but using reflector to look at the mvc default viewengine and its dependencies, it seems to go on and on and i'd rather not have to re-implement stuff thats already there. Has anyone got a cunning idea how to solve this? I know i could make things easier with setter instead of constructor injection but id rather avoid that if possible.

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• How to Alphabetically retrieve members of a list?

  - by Neoryder

  I have an organization class class Organization { hasMany = [member:Members] } class Members { belongsTo = organization } I'm printing all the members using <ol> <g:each in="${organizationInstance?.members?}" var="m"> <li><g:link controller="members" action="show" id="${m.id}">${m?.encodeAsHTML()}</g:link></li> </g:each> </ol> I want to sort the printing of members so that it would print alphabetically. any ideas?

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• Click event to a Gwt-connector

  - by sprasad12

  Hi, I am trying to add click event to one of the widgets that use gwt-connector. Here is the code: public class Diagrams extends Diagram implements HasClickHandlers{ public Diagrams(AbsolutePanel boundaryPanel) { super(boundaryPanel); } @Override public HandlerRegistration addClickHandler(ClickHandler handler) { return addDomHandler(handler, ClickEvent.getType()); } @Override public void fireEvent(GwtEvent<?> event) { } } Here Diagram is a gwt-connector class. Here is the link to the Diagram class and also link to GWT-Connector. Question: Am i doing anything wrong in the code while adding the clickhandler? I am getting error saying that addDomHandler is undefined for the type Diagrams. are there limitations for adding click handlers? Any input will be of great help. Thank you.

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• iphone - memory leaks in separate thread

  - by Brodie4598

  I create a second thread to call a method that downloads several images using: [NSThread detachNewThreadSelector:@selector(downloadImages) toTarget:self withObject:nil]; It works fine but I get a long list of leaks in the log similar to: 2010-04-18 00:48:12.287 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbec2640 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5e973 0x5e770 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) 2010-04-18 00:48:12.288 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbe01510 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5e7a6 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) 2010-04-18 00:48:12.289 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbde6720 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5ea73 0x5e7c2 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) Can someone help me understand the problem?

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• Launching MapActivity from another activity

  - by DixieFlatline

  Hello! I have 1 activity and 1 class that extends MapActivity(Lokacija). I added MapActivity to manifest, this line and my build configuration is set to Google API. I want to launch the mapactivity with the press of a button as usually: final Intent i = new Intent(); intent.setClass(getApplicationContext(), Lokacija.class); startactivity(i);ode here When i click on a button, I get android runtime exception (no activity found to handle intent). I has to be something with class extending MapActivity, but i don't know what. Any suggestions?

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• Asynchronous Silverlight WCF callback

  - by Matt

  I've created my own WCF service and I've successfully been able to talk to it via my Silverlight client. I ran into an interesting problem on my asynchronous callbacks though. When my callback is invoked, I can't update any UI controls with the dreaded invalid cross thread access Here's what my callback function looks like private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { lblDisplay.Text = e.Object.ToString(); } A quick google search showed me that I have to do this instead. private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { Dispatcher.BeginInvoke( () => lblDisplay.Text = e.Object.ToString() ); } Now everything works fine, but I wasn't expecting my callback to be running on a different thread. Will I always have to use the Dispatcher class in order to modify anything within my class or is this just limited to UI elements? I've not familiar with the Dispatcher class at all so I'm looking to understand it more.

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• Extending DOMDocument and DOMNode: problem with return object

  - by Glauber Rocha

  I'm trying to extend the DOMDocument class so as to make XPath selections easier. I wrote this piece of code: class myDOMDocument extends DOMDocument { function selectNodes($xpath){ $oxpath = new DOMXPath($this); return $oxpath->query($xpath); } function selectSingleNode($xpath){ return $this->selectNodes($xpath)->item(0); } } These methods return a DOMNodeList and a DOMNode object, respectively. What I'd like to do now is to implement similar methods to the DOMNode objects. But obviously if I write a class (myDOMNode) that extends DOMNode, I won't be able to use these two extra methods on the nodes returned by myDOMDocument because they're DOMNode (and not myDOMNode) objects. I'm rather a beginner in object programming, I've tried various ideas but they all lead to a dead-end. Any hints? Thanks a lot in advance.

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• Configuring Rolling File Appender

  - by Anand

  Hi, My jboss application server log file named jboss-log4j.xml has the following configuration for the rolling file appender <appender name="FILE" class="org.jboss.logging.appender.RollingFileAppender"> <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/> <param name="File" value="${jboss.server.log.dir}/server.log"/> <param name="Append" value="false"/> <param name="MaxFileSize" value="500KB"/> <param name="MaxBackupIndex" value="1"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/> </layout> </appender> What does this exactly do ? How should I set it to do either of the two things ? 1. Delete logs older than 5 days or 2. Delete logs when they exceed 800MB, so that once they are deleted the new logs can take effect

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• Making a Form Input Field Large

  - by John

  Hello, For the form below, how could I make the input field big, like maybe 100 pixels in height by 400 pixels in length? Thanks in advance, John <form action="http://www...com/sandbox/comments/comments2.php" method="post"> <input type="hidden" value="'.$_SESSION['loginid'].'" name="uid"> <div class="addacomment"><label for="title">Add a comment:</label></div> <div class="submissionfield"><input name="title" type="title" id="title" maxlength="1000"></div> <div class="submissionbutton"><input name="submit" type="submit" value="Submit"></div> </form>

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• How to customize pickle for django model objects

  - by muudscope

  I need to pickle a complex object that refers to django model objects. The standard pickling process stores a denormalized object in the pickle. So if the object changes on the database between pickling and unpickling, the model is now out of date. (I know this is true with in-memory objects too, but the pickling is a convenient time to address it.) So what I'd like is a way to not pickle the full django model object. Instead just store its class and id, and re-fetch the contents from the database on load. Can I specify a custom pickle method for this class? I'm happy to write a wrapper class around the django model to handle the lazy fetching from db, if there's a way to do the pickling.

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• Prevent line break between two elements in CSS

  - by Paul Alexander

  For some basic layout work I'm doing, I'd like links that immediately follow a price to always be shown on the same line as the price. The price text is wrapped in a <span class="price"> tag while the link uses the buy-link class as in <a href="/buy" class="buy-link">Buy Now</a>. I'm looking for CSS that will automatically prevent line breaking between the span and a tag but I'm either missing something or it can't be done. I can easily prevent line breaks within the two tags - but not between them. I want to avoid wrapping both tags in a span with a white-space: nowrap manually and use pure CSS if possible.

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• How to hide GetType() method from COM?

  - by ticky

  I made an automation Add-In for Excel, and I made several functions (formulas). I have a class which header looks like this (it is COM visible): [ClassInterface(ClassInterfaceType.AutoDual)] [ComVisible(true)] public class Functions {} In a list of methods, I see: ToString(), Equals(), GetHashCode() and GetType() methods. Since all methods of my class are COM visible, I should somehow hide those 4. I succeeded with 3 of them: ToString(), Equals(), GetHashCode() but GetType() cannot be overriden. Here is what I did with 3 of them: [ComVisible(false)] public override string ToString() { return base.ToString(); } [ComVisible(false)] public override bool Equals(object obj) { return base.Equals(obj); } [ComVisible(false)] public override int GetHashCode() { return base.GetHashCode(); } This doesn't work: [ComVisible(false)] public override Type GetType() { return base.GetType(); } Here is the error message in Visual Studio when compile: ..GetType()': cannot override inherited member 'object.GetType()' because it is not marked virtual, abstract, or override So, what should I do to hide the GetType() method from COM?

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• Implicit typing of arrays that implement interfaces

  - by Sir Psycho

  Hi, I was under the impression that the C# compiler will implicitly type an array based off a type that they can all be implicitly converted to. The compiler generates No best type found for implicitly-typed array public interface ISomething {} public interface ISomething2 {} public interface ISomething3 {} public class Foo : ISomething { } public class Bar : ISomething, ISomething2 { } public class Car : ISomething, ISomething3 { } void Main() { var obj1 = new Foo(); var obj2 = new Bar(); var obj3 = new Car(); var objects= new [] { obj1, obj2, obj3 }; } I know that the way to correct this is to declare the type like: new ISomething [] { obj1, ...} But I'm after an under the covers type help here :-) Thanks

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• Declaring CustomViewController?

  - by fuzzygoat

  I have noticed in some of my older apps that in situations where I have added a custom View Controller I have not changed the View Controller class in the application delegate. For example, below I have created a CustomViewController class but have declared viewController as UIViewController. @interface ApplicationAppDelegate: NSObject <UIApplicationDelegate> { UIWindow *window; UIViewController *viewController; } My question is, both work, but for correctness should I be writing this as follows: @class CustomViewController; @interface ApplicationAppDelegate: NSObject <UIApplicationDelegate> { UIWindow *window; CustomViewController *viewController; } gary

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• Python language API

  - by Oscar Reyes

  Hello. I'm starting with Python coming from java. I was wondering if there exists something similar to JavaDoc API where I can find the class, its methods and and example of how to use it. I've found very helpul to use help( thing ) from the Python ( command line ) I have found this also: http://docs.python.org/ http://docs.python.org/modindex.html But it seems to help when you already the class name you are looking for. In JavaDoc API I have all the classes so if I need something I scroll down to a class that "sounds like" what I need. Or some times I just browse all the classes to see what they do, and when I need a feature my brain recalls me We saw something similar in the javadoc remember!? But I don't seem to find the similar in Python ( yet ) and that why I'm posting this questin. BTW I know that I would eventually will read this: http://docs.python.org/lib/lib.html But, well, I think it is not today.

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• How do I force Eclipse to rebuild if files in another project change (any change)?

  - by James Moore

  I've got an Eclipse (Galileo) project (called ProguardBuilder) that runs Proguard over a set of class files in other projects and produces a jar file. I'd like to have the ProguardBuilder project get rebuilt any time any class file in the other projects changes. AutoBuild doesn't do that; presumably it's smart enough to recognize and ignore any changes that don't affect anything externally visible. My problem is that I don't care whether or not the change is visible, since I need to completely rebuild ProguardBuilder any time the class files it depends on change at all. How do I tell Eclipse to do this sort of rebuild?

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• Flash Double-click an externally loaded SWF

  - by Trist

  OK. I've got a class (which extends MovieClip) that loads in an external SWF (made in pdf2swf). That is added to another class which has declared doubleClickEnabled = true and I'm listening for DOUBLE_CLICK events. Problem is when the SWF is loaded my code picks up no DOUBLE_CLICK events, only CLICK events. I've tried it without adding the SWF to the stage and it does pick up DOUBLE_CLICK events. Anybody come across this before? class ParentClass{ ... public function ParentClass(){ ... mcToLoadSWF = new MovieClip(); addChild(mcToLoadSWF); doubleClickEnabled = true; addEventListener(MouseEvent.DOUBLE_CLICK, doubleClickHandler); ... } } I've also tried adding the event listener to the mcToLoadSWF as well. No dice. Cheers Tristian

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• Hibernate - PropertyNotFoundException: Could not find a getter for ...

  - by Ben Noland

  I have a class that looks like the following: public class MyClass { private String dPart1; public String getDPart1() { return dPart1; } public void setDPart1(String dPart1) { this.dPart1 = dPart1; } } My hibernate mapping file maps the property as follows: <property name="dPart1" not-null="true"/> I get the following error: org.hibernate.PropertyNotFoundException: Could not find a getter for dPart1 in class com.mypackage.MyClass at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:282) at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:275) at org.hibernate.mapping.Property.getGetter(Property.java:272) at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertyGetter(PojoEntityTuplizer.java:247) at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:125) at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:55) at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.<init>(EntityEntityModeToTuplizerMapping.java:56) at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:302) at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:434) at It appears that hibernate doesn't like my capitalization. How should I fix this?

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• C# Constructor Question

  - by Vaccano

  I have a constructor question for C#. I have this class: public partial class Signature : Form, ISignature { private readonly SignatureMediator mediator; public Signature(SignatureMediator mediator) { this.mediator = mediator; InitializeComponent(); } .... more stuff } I want to construct this class like this: public SignatureMediator(int someValue, int otherValue, int thirdValue) : this(new Signature(this), someValue, otherValue, thirdValue) // This is not allowed --^ { // I don't see anyway to get this in to the ":this" part. //Signature signature = new Signature(this); } public SignatureMediator(ISignature form, int someValue, int otherValue, int thirdValue) { SigForm = form; SomeValue= someValue; OtherValue= otherValue; ThirdValue= thirdValue; } The : this( new SignatureThis(this) is not allowed (the this used in the constructor is not allowed). Is there anyway to set this up without duplicating the assignment of the int values?

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