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• Create IEnumerable<T>.Find()

  - by Brian

  I'd like to write: IEnumerable<Car> cars; cars.Find(car => car.Color == "Blue") Can I accomplish this with extension methods? The following fails because it recursively calls itself rather than calling IList.Find(). public static T Find<T>(this IEnumerable<T> list, Predicate<PermitSummary> match) { return list.ToList().Find(match); } Thanks!

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• Harvesting Dynamic HTTP Content to produce Replicating HTTP Static Content

  - by Neil Pitman

  I have a slowly evolving dynamic website served from J2EE. The response time and load capacity of the server are inadequate for client needs. Moreover, ad hoc requests can unexpectedly affect other services running on the same application server/database. I know the reasons and can't address them in the short term. I understand HTTP caching hints (expiry, etags....) and for the purpose of this question, please assume that I have maxed out the opportunities to reduce load. I am thinking of doing a brute force traversal of all URLs in the system to prime a cache and then copying the cache contents to geodispersed cache servers near the clients. I'm thinking of Squid or Apache HTTPD mod_disk_cache. I want to prime one copy and (manually) replicate the cache contents. I don't need a federation or intelligence amongst the slaves. When the data changes, invalidating the cache, I will refresh my master cache and update the slave versions, probably once a night. Has anyone done this? Is it a good idea? Are there other technologies that I should investigate? I can program this, but I would prefer a configuration of open source technologies solution Thanks

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• Objetive C - Calling Methods in objects.

  - by Mace

  I'm new to Objective C, and I seem to be struggling with accessing a method of an object I created. I'm checking out the documentation , but I'm not entirely sure tha tthis is a job for a delegate. For example I have an object (1) that creates another object (2). I can access a method of the object (2) after I create it, but I can't access it from a method of object (1). I get a error that the object was not defined in this scope. If anyone can help I greatly appreciate it. I just need a nudge in the right direction so that I can at least get a grasp on how to think about the interaction between the objects.

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• htaccess: Redirect a Dynamic URL - Show only Static URL - Double Content

  - by elmaso

  Hi, I have a rewrite rule to get clean urls.. the only problem is, google shows some dynamic url and i dont want to serve dynamic urls. What I want: if a user types in the dynamic url, he gets redirected to the clean url.. example: http://www.example.com/?index=bananas (if someone types that in, he gets redirect to the url above) http://www.examplcom/bananas/ this is my htacces: Options +FollowSymLinks RewriteEngine On RewriteBase / RewriteCond $1 !apple\+banana RewriteRule ^(.*)\+apple\+banana/$ ?q=$1 [L] thank you!!

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• How to turn dynamic URL into static URL

  - by Rafael Carvalho

  I am developing a website using PHP and Apache. I wanna turn my URLs from www.example.com/book.php?book=title into something like this, if it is possible of course: www.example.com/book/title Notice that the title of the books are unique and cannot be repeated. I`ve read about this, but none of the posts were clear enough for a beginner like me. Do you guys know any tutorial that explains that? Thanks.

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• ColdFusion static key/value list?

  - by richardtallent

  I have a database table that is a dictionary of defined terms -- key, value. I want to load the dictionary in the application scope from the database, and keep it there for performance (it doesn't change). I gather this is probably some sort of "struct," but I'm extremely new to ColdFusion (helping out another team). Then, I'd like to do some simple string replacement on some strings being output to the browser, looping through the defined terms and replacing the terms with some HTML to define the terms (a hover or a link, details to be worked out later, not important). Can anyone point me in the right direction of: How to define the stucture (if that is what I need for a key/value pair list) How to query at the application start-up and reuse the list properly The best way to do the string replacement

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• What is difference between this two C# methods

  - by RICH KID SMART KID

  What is the difference between these two cases. Firstly, if I open the connection and pass it into my method as a parameter, compared to opening the connection directly in the method? cnn.open() func(cnn,param1,param2); vs func(cnn, param1,param2) { cnn.open(); //open connection here }

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• JRockit Mission Control does not capture Spring Been methods invocations

  - by arkadiy

  Hi, I am trying to profile my Spring Web app running on WebLogic 9.2 JRockit Mission Control 4.0 works perfectly except it doesn't capture Spring Beens method invocations. Are there any tricks to make it work? Thank you, Arkadiy

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• Can't seem to get .Union to work (merging 2 array's together, exclude duplicates)

  - by D. Veloper

  I want to combine two array's, excluding duplicates. I am using a custom class: public class ArcContact : IEquatable<ArcContact> { public String Text; public Boolean Equals(ArcContact other) { if (Object.ReferenceEquals(other, null)) return false; if (Object.ReferenceEquals(this, other)) return true; return Text.Equals(other.Text); } public override Int32 GetHashCode() { return Text == null ? 0 : Text.GetHashCode(); } } I implemented and the needed IEquatable interface as mentioned in this msdn section. I only want to check the Text property of the ArcContact class and make sure an Array of ArcContact have an unique Text. Here I pasted the code that I use, as you can see I have method with two parameters, array's to combine and below that the code I got from the previous mentioned msdn section. internal static class ArcBizz { internal static ArcContact[] MergeDuplicateContacts(ArcContact[] contacts1, ArcContact[] contacts2) { return (ArcContact[])contacts1.Union(contacts2); } internal static IEnumerable<T> Union<T>(this IEnumerable<T> a, IEnumerable<T> b); } What am I doing wrong?

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• MustOverride Shared Methods in .Net

  - by Ben

  Hi I have a few class's that inherit from a base class. I want to enforce that all of these Class's implement a shared method foo(). I am not able to create the following on the base class Public MustOvveride Shared Sub foo() as this is not allowed. I also cant create an Interface that defines a Shared Sub Foo() and implement that in my derrived class's, as this also is not allowed. Does anyone know how i should implement this? p.s i realise my example is in VB and i have also tagged C#, the same problem applies to both languages and presumably the same fix would apply.

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• Testing InlineFormset clean methods

  - by Rory

  I have a Django project, with 2 models, a Structure and Bracket, the Bracket has a ForeignKey to a Structure (i.e. one-to-many, one Structure has many Brackets). I created a TabularInline for the admin site, so that there would be a table of Brackets on the Structure. I added a custom formset with some a custom clean method to do some extra validation, you can't have a Bracket that conflicts with another Bracket on the same Structure etc. The admin looks like this: class BracketInline(admin.TabularInline): model = Bracket formset = BracketInlineFormset class StructureAdmin(admin.ModelAdmin): inlines = [ BracketInline ] admin.site.register(Structure, StructureAdmin) That all works, and the validation works. However now I want to write some unittest to test my complex formset validation logic. My first attempt to validate known-good values is: data = {'form-TOTAL_FORMS': '1', 'form-INITIAL_FORMS': '0', 'form-MAX_NUM_FORMS': '', 'form-0-field1':'good-value', … } formset = BracketInlineFormset(data) self.assertTrue(formset.is_valid()) However that doesn't work and raises the exception: ====================================================================== ERROR: testValid (appname.tests.StructureTestCase) ---------------------------------------------------------------------- Traceback (most recent call last): File "/paht/to/project/tests.py", line 494, in testValid formset = BracketInlineFormset(data) File "/path/to/django/forms/models.py", line 672, in __init__ self.instance = self.fk.rel.to() AttributeError: 'BracketInlineFormset' object has no attribute 'fk' ---------------------------------------------------------------------- The Django documentation (for formset validation) implies one can do this. How come this isn't working? How do I test the custom clean()/validation for my inline formset?

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• Ruby: Dynamically calling available methods raising undefined method (metaprogramming)

  - by user94154

  I have an Activerecord object called Foo: Foo.attribute_names.each do |attribute| puts Foo.find(:all)[0].method(attribute.to_sym).call end Here I'm calling all attributes on this model (ie, querying for each column value). However, sometimes, I'll get an undefined method error. How can ActiveRecord::Base#attribute_names return an attribute name that when converted into its own method call, raises an undefined method error? Thank

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• javascript inherance? with Private vars and methods too

  - by Totty

  Hy i need to inherent a class from another. Parent has private var "_data" and private method "_test" and public method "add" Now the child have a public method "add", that uses the private method from the parent "_test" and the private var "_data". How do i do this? var Parent = function(){ var _data = {}; var _test = function(){alert('test')}; this.add = function(){alert('add from parent')} } var Child = function(){ this.add = function(){// here uses the _data and _test from the Parent class alert('add from child') } } // something to inherent Child from Parent // instance Child and use the add method And i think im miss the prototype concept (http://stackoverflow.com/questions/892467/javascript-inheritance)

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• spidermonkey using JS_CallFunction for static function

  - by supersuraccoon

  JS_CallFunctionName can call a method of an object by name: JSObject* obj; JS_CallFunctionName(cx, obj, "doSomething", argc, vp, retVal); The code above works fine if the "doSomething" is a function declared in the prototype of the "obj". What I want to know is if there is a way to call a function that is a "class function". I tried: if(JS_HasProperty(getGlobalContext(), getGlobalObject(), "ClassToGet", &b)) { print("OK"); } and the output is "OK". But when tried: JS_GetProperty(getGlobalContext(), getGlobalObject(), "ClassToGet", &jsOwner); if (jsOwner != JSVAL_VOID) { } the jsOwner is a JSVAL_VOID. Maybe there is a function in SpiderMonkey can execute function in a JSClass ? Any suggestion will be appreciated, thanks :)

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• So functions/methods in PHP are case insensitive?

  - by user198729

  function ag() { echo '2'; } Ag(); class test { function clMe() { echo 'hi'; } } $instance = new test; $instance->clme(); But that's the not case with variables, what's the rationale in it?

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• Calling delegate methods and calling selectors

  - by Crystal

  I'm new to the concept of delegates and selectors when used with notifications. So my first question is, 1) Let's say you have a button that has a delegate that implements some doWork method. If you want the same functionality that's in the method, is it 'ok' to just call that method? I didn't know if that was considered good coding practices and/or if you should do that, or do something different in getting that type of functionality. Like if that is ok architecture? 2) Similarly, with NSNotificationCenter, I see some code that posts a notification. Then there's a HandleSegmentedControl:(NSNotification *)notification method. If I want to manually have that functionality, but without pressing the segment control, is it 'ok' to just take that functionality out of that method and put it in a new method so it would look like this: Original: - (void)HandleSegmentedControl:(NSNotification *)notification { NSDictionary *dict = [userInfo notification]; // do stuff with the dictionary } New: - (void)HandleSegmentedControl:(NSNotification *)notification { NSDictionary *dict = [userInfo notification]; [self newMethod:dict]; } - (void)newMethod:(NSDictionary *)dict { // do stuff with the dictionary } - (void)myOtherMethodThatNeedsTheSameFunctionality { NSDictionary *dict = // create some dictionary [self newMethod:dict]; } Sorry if these are basic questions. I'm not sure what the best practices are for things like this and wanted to start the right way. Thanks.

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• Is it possible to load an external JavaScript file by flash and then call its methods

  - by guytom

  I am talking about doing something like this: http://stackoverflow.com/questions/1375714/load-external-javascript-on-function-call from flash by using ExternalInterface probably

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• virtual methods and template classes

  - by soxs060389

  Hi I got over a problem, I think a very specific one. I've got 2 classes, a B aseclass and a D erived class (from B aseclass). B is a template class ( or class template) and has a pure virtual method virutal void work(const T &dummy) = 0; The D erived class is supposed to reimplement this, but as D is Derived from B rather than D being another template class, the compiler spits at me that virtual functions and templates don't work at once. Any ideas how to acomplish what I want? I am thankfull for any thoughts and Ideas, especially if you allready worked out that problem this class is fixed aka AS IS, I can not edit this without breaking existing code base template <typename T> class B { public: ... virtual void work(const T &dummy) = 0; .. }; take int* as an example class D : public B<int*>{ ... virtual void work(const int* &dummy){ /* put work code here */ } .. }; Edit: The compiler tells me, that void B<T>::work(const T&) [with T = int*] is pure virtual within D

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• ssrs: one static row matrix, multiple columns will not filter out nulls

  - by pbarton99

  Using a ssrs 2005 matrix client side. I want to list the multiple addresses of one person, hence one row, multiple columns. The Column field is =Fields!StreetName.Value. The data details field is =First(Fields!StreetPrefix.Value) & " " & First(Fields!StreetName.Value). The datasource has a row for each address; however, some rows will have nulls since the datasource is composed of outer joins. The column grouping works, but the first column is always empty, (first 2 rows of datasource are null) addresses appear only after the empty column. I want to filter out nulls on the matrix, but its like the filter is ignored. I have also tried having the dataset return an empty string for a null streetname and setting the filter to =Fields!StreetName.Value != ="" but no difference. What am I missing?

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• Django Piston - how can I create custom methods?

  - by orokusaki

  I put my questions in the code comments for clarity: from piston.handler import AnonymousBaseHandler class AnonymousAPITest(AnonymousBaseHandler): fields = ('update_subscription',) def update_subscription(self, request, months): # Do some stuff here to update a subscription based on the # number of months provided. # How the heck can I call this method? return {'msg': 'Your subscription has been updated!'} def read(self, request): return { 'msg': 'Why would I need a read() method on a fully custom API?' }

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• Resources and techniques/methods for SCJP preparation ?

  - by BenoitParis

  I am passing the SCJP 6 exam in a month. I have the "SCJP Sun Certified Programmer for Java 6 Exam 310-065" book. It seems great for the exam. But I want your advice on this. Getting the closest possible to 100% would be great. I have found a site that answered some of the questions you ask yourself when you go trough the book. Here is it : http://www.janeg.ca/java2.html As you can see it was written for Java 2 :/ I have written another specific question here on StackOverflow about the usefulness of JVM specification and Java compiler code for the SCJP. Will Update the results here. Here it is. Please share the resources you used in preparing the exam. Please also specify any resources that you think might help. Any type of resource is welcome: books, code, specs, sites, wikies, papers, online tests, grandmas... Please also share on any method/technique that helped you prepare the exam. Please also comment on the return you got from the resource and the method (for the learning process and for points in the exam) I'll begin: Book : "SCJP Sun Certified Programmer for Java 6 Exam 310-065". Seems like the official book for the preparation. Technique : Writing code in a text editor and compiling it with javac to test a question. NO IDEs! It helps you get a a straight answer to a question you have. It helps you pay attention to every word in the code (and this is very important in the SCJP) EDIT: Added dimension: Are there good, up-to-date online tests?

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• How do I override methods of nested types?

  - by Mason Wheeler

  I've got a custom TObjectList descendant in Delphi 2009, and I'd like to play with its enumerator a bit and add some filtering functionality to the MoveNext method, to cause it to skip certain objects. MoveNext is called by DoMoveNext, which is a virtual method, so this shouldn't be difficult to override... except for one thing. The TEnumerator for TObjectList isn't its own class; it's declared as a nested type within the TObjectList declaration. Is there any simple way to override TEnumerator.DoMoveNext in my descendant class, or do I have to reimplement the whole TEnumerator? It's not a very big class, but I'd prefer to keep redundancies to a minimum if I can...

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• Extension method return using generics

  - by Steven de Salas

  Is it possible to return a generic type using extension methods? For example, I have the following method: // Convenience method to obtain a field within a row (as a double type) public static double GetDouble(this DataRow row, string field) { if (row != null && row.Table.Columns.Contains(field)) { object value = row[field]; if (value != null && value != DBNull.Value) return Convert.ToDouble(value); } return 0; } This is currently used as follows: double value = row.GetDouble("tangible-equity"); but I would like to use the following code: double value = row.Get<double>("tangible-equity"); Is this possible and if so, what would the method look like?

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• Javascript: Make a static code, dynamic - List of inputs

  - by BoDiE2003

  I have this code, that checks some ids and enable others, the javascript is pretty clear about what it does, but since it corresponds to some specific id ranges, I cant do just a look until it finishes, but I'm looking a way to do this dynamic and save 40 lines of code (or more), since its not the best way. function loopGroup1() { var a = 0; do { $$('.selectedAuthorities-3_' + a).each(function(chk1) { // watch for clicks chk1.observe('click', function(evt) { dynamicCheckbox1(); }); dynamicCheckbox1(); }); a++; } while (a < 4); } function dynamicCheckbox1() { // count how many of group_first are checked, // doEnable true if any are checked var doEnable = ($$('.selectedAuthorities-3_0:checked').length > 0) ? true : false; var doEnable1 = ($$('.selectedAuthorities-3_1:checked').length > 0) ? true : false; var doEnable2 = ($$('.selectedAuthorities-3_2:checked').length > 0) ? true : false; // for each in group_second, enable the checkbox, and // remove the cssDisabled class from the parent label var i = 0; do { $$('.selectedAuthorities-4_' + i).each(function(item) { if (doEnable || doEnable1 || doEnable2) { item.enable().up('li').removeClassName('cssDisabled'); } else { item.disable().up('li').addClassName('cssDisabled'); } }); i++; } while (i < 4); }; /* * * Loop Group 2 * * */ function loopGroup2() { var a = 0; do { $$('.selectedAuthorities-5_' + a).each(function(chk1) { // watch for clicks chk1.observe('click', function(evt) { dynamicCheckbox2(); }); dynamicCheckbox2(); }); a++; } while (a < 4); } function dynamicCheckbox2() { // count how many of group_first are checked, // doEnable true if any are checked var doEnable3 = ($$('.selectedAuthorities-5_0:checked').length > 0) ? true : false; // for each in group_second, enable the checkbox, and // remove the cssDisabled class from the parent label var i = 0; do { $$('.selectedAuthorities-6_' + i).each(function(item) { if (doEnable3) { item.enable().up('li').removeClassName('cssDisabled'); } else { item.disable().up('li').addClassName('cssDisabled'); } }); i++; } while (i < 4); }; /* * * Loop Group 3 * * */ function loopGroup3() { var a = 0; do { $$('.selectedAuthorities-6_' + a).each(function(chk1) { // watch for clicks chk1.observe('click', function(evt) { dynamicCheckbox3(); }); dynamicCheckbox3(); }); a++; } while (a < 4); } function dynamicCheckbox3() { // count how many of group_first are checked, // doEnable true if any are checked var doEnable4 = ($$('.selectedAuthorities-6_0:checked').length > 0) ? true : false; var doEnable5 = ($$('.selectedAuthorities-6_1:checked').length > 0) ? true : false; // for each in group_second, enable the checkbox, and // remove the cssDisabled class from the parent label var i = 0; do { $$('.selectedAuthorities-7_' + i).each(function(item) { if (doEnable4 || doEnable5) { item.enable().up('li').removeClassName('cssDisabled'); } else { item.disable().up('li').addClassName('cssDisabled'); } }); i++; } while (i < 4); }; /* * * Loop Group 4 * * */ function loopGroup4() { var a = 0; do { $$('.selectedAuthorities-9_' + a).each(function(chk1) { // watch for clicks chk1.observe('click', function(evt) { dynamicCheckbox4(); }); dynamicCheckbox4(); }); a++; } while (a < 4); } function dynamicCheckbox4() { // count how many of group_first are checked, // doEnable true if any are checked var doEnable6 = ($$('.selectedAuthorities-9_0:checked').length > 0) ? true : false; var doEnable7 = ($$('.selectedAuthorities-9_1:checked').length > 0) ? true : false; // for each in group_second, enable the checkbox, and // remove the cssDisabled class from the parent label var i = 0; do { $$('.selectedAuthorities-10_' + i).each(function(item) { if (doEnable6 || doEnable7) { item.enable().up('li').removeClassName('cssDisabled'); } else { item.disable().up('li').addClassName('cssDisabled'); } }); i++; } while (i < 4); };

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• Error handling in C++, constructors vs. regular methods

  - by Dennis Ritchie

  I have a cheesesales.txt CSV file with all of my recent cheese sales. I want to create a class CheeseSales that can do things like these: CheeseSales sales("cheesesales.txt"); //has no default constructor cout << sales.totalSales() << endl; sales.outputPieChart("piechart.pdf"); The above code assumes that no failures will happen. In reality, failures will take place. In this case, two kinds of failures could occur: Failure in the constructor: The file may not exist, may not have read-permissions, contain invalid/unparsable data, etc. Failure in the regular method: The file may already exist, there may not be write access, too little sales data available to create a pie chart, etc. My question is simply: How would you design this code to handle failures? One idea: Return a bool from the regular method indicating failure. Not sure how to deal with the constructor. How would seasoned C++ coders do these kinds of things?

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