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• Changing XML Namespace with Scala

  - by toddk

  I am using scala to load a XML file from file via the scala.xml.XML.loadFile() method. The documents I'm working with have namespaces already defined and I wish to change the namespace to something else using scala. For example, a document has a xmlns of "http://foo.com/a" with a prefix of "a" - I would like to change the namespace and prefix for the document to "http://foo.com/b" and "b" respectively. Seems easy and I feel like I'm missing something obvious here. I do not have a problem getting the namespace from the return Elem from the referenced loadFile() method.

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• ipod's repeat mode

  - by gayathri

  my ipod's repeatmode is always in MPMusicRepeatModeDefault,How will turn it off/how to change its mode?.i used setRepeatMode method but that does not work out.thanks

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• how does tomcat like web container handle struts 2 variables ?

  - by mobby1982

  i am a newbie . i have a question regarding struts 2 framework and tomcat . i know that each request has it own thread , but my question is are the global variables defined in struts action shared amongst requests. for ex: if i have a global variable named say int pageNo; and i am using in say method called paginationAll() can i use the same variable (pageNo) for another method called say paginatonMaterialAll() in the same action or does each thread has its own set of variables even though globally defined?

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• Backbone.js Model validation fails to prevent Model from saving

  - by Benjen

  I have defined a validate method for a Backbone.js Model. The problem is that even if validation fails (i.e. the Model.validate method returns a value) the post/put request is still sent to the server. This contradicts what is explained in the Backbone.js documentation. I cannot understand what I am doing wrong. The following is the Model definition: /** * Model - Contact */ var Contact = Backbone.Model.extend({ urlRoot: '/contacts.json', idAttribute: '_id', defaults: function() { return { surname: '', given_name: '', org: '', phone: new Array(), email: new Array(), address: new Array({ street: '', district: '', city: '', country: '', postcode: '' }) }; } validate: function(attributes) { if (typeof attributes.validationDisabled === 'undefined') { var errors = new Array(); // Validate surname. if (_.isEmpty(attributes.surname) === true) { errors.push({ type: 'form', attribute: 'surname', message: 'Please enter a surname.' }); } // Validate emails. if (_.isEmpty(attributes.email) === false) { var emailRegex = /^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,6}$/i; // Stores indexes of email values which fail validation. var emailIndex = new Array(); _.each(attributes.email, function(email, index) { if (emailRegex.test(email.value) === false) { emailIndex.push(index); } }); // Create error message. if (emailIndex.length > 0) { errors.push({ type: 'form', attribute: 'email', index: emailIndex, message: 'Please enter valid email address.' }); } } if (errors.length > 0) { console.log('Form validation failed.'); return errors; } } } }); Here is the View which calls the Model.save() method (see: method saveContact() below). Note that other methods belonging to this View have not been included below for reasons of brevity. /** * View - Edit contact form */ var EditContactFormView = Backbone.View.extend({ initialize: function() { _.bindAll(this, 'createDialog', 'formError', 'render', 'saveContact', 'updateContact'); // Add templates. this._editFormTemplate = _.template($('#edit-contact-form-tpl').html()); this._emailFieldTemplate = _.template($('#email-field-tpl').html()); this._phoneFieldTemplate = _.template($('#phone-field-tpl').html()); // Get URI of current page. this.currentPageUri = this.options.currentPageUri; // Create array to hold references to all subviews. this.subViews = new Array(); // Set options for new or existing contact. this.model = this.options.model; // Bind with Model validation error event. this.model.on('error', this.formError); this.render(); } /** * Deals with form validation errors */ formError: function(model, error) { console.log(error); }, saveContact: function(event) { var self = this; // Prevent submit event trigger from firing. event.preventDefault(); // Trigger form submit event. eventAggregator.trigger('submit:contactEditForm'); // Update model with form values. this.updateContact(); // Enable validation for Model. Done by unsetting validationDisabled // attribute. This setting was formerly applied to prevent validation // on Model.fetch() events. See this.model.validate(). this.model.unset('validationDisabled'); // Save contact to database. this.model.save(this.model.attributes, { success: function(model, response) { if (typeof response.flash !== 'undefined') { Messenger.trigger('new:messages', response.flash); } }, error: function(model, response) { console.log(response); throw error = new Error('Error occured while trying to save contact.'); } }, { wait: true }); }, /** * Extract form values and update Contact. */ updateContact: function() { this.model.set('surname', this.$('#surname-field').val()); this.model.set('given_name', this.$('#given-name-field').val()); this.model.set('org', this.$('#org-field').val()); // Extract address form values. var address = new Array({ street: this.$('input[name="street"]').val(), district: this.$('input[name="district"]').val(), city: this.$('input[name="city"]').val(), country: this.$('input[name="country"]').val(), postcode: this.$('input[name="postcode"]').val() }); this.model.set('address', address); } });

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• Need help in translating code from C or C++ to Java.

  - by Vuntic

  From this article. Here's the code: float InvSqrt(float x){ // line 0 float xhalf = 0.5f * x; int i = *(int*)&x; // store floating-point bits in integer i = 0x5f3759d5 - (i >> 1); // initial guess for Newton's method x = *(float*)&i; // convert new bits into float x = x*(1.5f - xhalf*x*x); // One round of Newton's method return x; } ...I can't even tell if that's C or C++. Could someone translate it to Java for me, please? It's (only, I hope) lines 2 and 4 that are confusing me. I'll edit out the confusion about C/C++ from the tags once somebody tells me which it is.

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• Algorithms after load-balancer?

  - by Vimvq1987

  I need to study about load-balancers, such as Network Load Balancing, Linux Virtual Server, HAProxy,...There're somethings under-the-hood I need to know: What algorithms/technologies are used in these load-balancers? Which is the most popular? most effective? I expect that these algorithms/technologies will not be too complicated. Are there some resources written about them? Thank you very much for your help.

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• Java synchronizing static list ?

  - by JavaUser

  Hi, In a Java class , i am having a static list so this list is shared across all the objects of this class.The business logic in this class will run periodically which is invoked by some method with out passing instance parameters.Now I want to invoke this run method based on the list(I will add some vales into this list based on JMS) ,this list may empty sometimes and after finishing the run , i am emptying this list.Now my question is , whether I need to synchronize this list or not? Also let me know is there any other way to pass value in one object instance(Thread1) to other object instance (Thread2) other than having Static variable(static list)? Thx

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• How do I "valueOf" an enum given a class name?

  - by stevemac

  Lets say I have a simple Enum called Animal defined as: public enum Animal { CAT, DOG } and I have a method like: private static Object valueOf(String value, Class<?> classType) { if (classType == String.class) { return value; } if (classType == Integer.class) { return Integer.parseInt(value); } if (classType == Long.class) { return Long.parseLong(value); } if (classType == Boolean.class) { return Boolean.parseBoolean(value); } // Enum resolution here } What can I put inside this method to return an instance of my enum where the value is of the classType? I have looked at trying: if (classType == Enum.class) { return Enum.valueOf((Class<Enum>)classType, value); } But that doesn't work.

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• Javascript opens new window despite no call

  - by Jimmy

  I have a javascript that opens a new window for "PreChecking" a site. The problem is when i click the button, it works fine... but wichever i button i press next makes the method fire again, despite i doesn't call it. Its just the button with id "lnkPrecheck" that should call the method. Have searched far and wide for a slolution that just opens a new window for the lnkPrecheck button, not the others on the site. THere must be a way for only 1 of 3 buttons makes the function call, not all of them! The code: <asp:Button OnClick="lnkPrecheck_Click" OnClientClick="NewWindow();" ID="lnkPrecheck" runat="server" text="Precheck (Opens in a new window)" /> function NewWindow() { document.forms[0].target = "_blank"; }

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• Does 'throw' or 'try...catch' hinder performance?

  - by Richard

  I've been reading all over the place (including here) about when exception should / shouldn't be used. I now want to change my code that would throw to make the method return false and handle it like that, but my question is: Is it the throwing or try..catch-ing that can hinder performance...? What I mean is, would this be acceptable: bool method someMmethod() { try { // ...Do something catch (Exception ex) // Don't care too much what at the moment... { // Output error // Return false } return true // No errors Or would there be a better way to do it? (I'm bloody sick of seeing "Unhandled exception..." LOL!)

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• C++ Inheritance Question

  - by shaz

  I have a base class MessageHandler and 2 derived classes, MessageHandler_CB and MessageHandler_DQ. The derived classes redefine the handleMessage(...) method. MH_DQ processes a message and puts the result in a deque while MH_CB processes the message and then executes a callback function. The base class has a static callback function that I pass along with a this pointer to a library which calls the static callback when a new message is available for processing. My problem comes when I am in the static callback with a void * pointing to either a MH_DQ or a MH_CB. If I cast it to the base class the empty MessageHandler::handleMessage(...) method is called, rather than the version in the appropriate derived class. What is the best way to address this situation from a design perspective and/or what language features might help me to implement a solution to my problem? Thanks in advance!

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• Unable to pass attribute from controller to view

  - by MDS

  I'm using Spring MVC 3 for a web app. In the app a URI template is supposed to be handled by a controller method, which then passes an attribute to a view. Currently, the controller does handle the request, and it even forwards to the correct view. However, it does NOT pass the attribute to the view. Below are the URI template, controller method and relevent jsp tags. Anyone see what is wrong? URI: /home/{status} Controller: @RequestMapping("/home") @Controller public class HomeController { ... ... @RequestMapping(value="/{status}") public String homeStatusView(@PathVariable("status") String status, ModelMap model) { model.addAttribute("status", status); return "home"; } } JSP: ... <c:if test="${not empty status}"> <span class="status">Your status is available...</span> </c:if> ...

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• C++ template specialization

  - by user231536

  I have a class template <typename T> class C { static const int K=1; static ostream& print(ostream& os, const T& t) { return os << t;} }; I would like to specialize C for int. //specialization for int template <> C<int>{ static const int K=2; } I want the default print method that works for int to remain and just change the constant. For some specializations, I want to keep K=1 and change the print method because there is no << operator. How do I do this?

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• [Scala] Applying overloaded, typed methods on a collection

  - by stephanos

  I'm quite new to Scala and struggling with the following: I have database objects (type of BaseDoc) and value objects (type of BaseVO). Now there are multiple convert methods (all called 'convert') that take an instance of an object and convert it to the other type accordingly - like this: def convert(doc: ClickDoc): ClickVO = ... def convert(doc: PointDoc): PointVO = ... def convert(doc: WindowDoc): WindowVO = ... Now I sometimes need to convert a list of objects. How would I do this - I tried: def convert[D <: BaseDoc, V <: BaseVO](docs: List[D]):List[V] = docs match { case List() => List() case xs => xs.map(doc => convert(doc)) } Which results in 'overloaded method value convert with alternatives ...'. I tried to add manifest information to it, but couldn't make it work. I couldn't even create one method for each because it'd say that they have the same parameter type after type erasure (List). Ideas welcome!

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• How to insert into data base using multi threading programming [closed]

  - by user1196650

  I am having a method and that method needs to do the following thing: It has to insert records into a database. No insert is done for the same table again. All inserts are into different tables. I need a multi threading logic which inserts the details into db using different threads. I am using oracle db and driver configuration and remaining stuff are perfect. Please help me with an efficient answer. Can anyone could provide me with a skeleton logic of the program.

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• enable_shared_from_this and inheritance

  - by DeadMG

  I've got a type which inherits from enable_shared_from_this<type>, and another type that inherits from this type. Now I can't use the shared_from_this method because it returns the base type and in a specific derived class method I need the derived type. Is it valid to just construct a shared_ptr from this directly? Edit: In a related question, how can I move from an rvalue of type shared_ptr<base> to a type of shared_ptr<derived>? I used dynamic_cast to verify that it really was the correct type, but now I can't seem to accomplish the actual move.

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• Any reason NOT to slap the 'synchronized' keyword everywhere?

  - by unknown

  In my java project, almost every non-static method I've written is synchronized. I've decided to fix up some code today, by removing most of the synchronized keywords. Right there I created several threading issues that took quite a while to fix, with no increase in performance. In the end I reverted everything. I don't see anyone else writing code with "synchronized" everywhere. So is there any reason I shouldn't have "synchronized" everywhere? What if I don't care too much about performance (ie. the method isn't called more than once every few seconds)?

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• question on reverse array

  - by davit-datuashvili

  we know algorithm how reverse array of n integers for (int i=0;i<n/2;i++){ swap(a[i],a[n-1-i]): } is this method better according the speed of algorithm or not because swap using xor is more fast then in other method here is code public class swap { public static void main(String[]args){ int a[]=new int[]{2,4,5,7,8,11,13,12,14,24}; System.out.println(" array at the begining:"); for (int i=0;i<a.length;i++){ System.out.println(a[i]); } for (int j=0;j<a.length/2;j++){ a[j]^=a[a.length-1-j]; a[a.length-1-j]^=a[j]; a[j]^=a[a.length-1-j]; } System.out.println("reversed array:"); for (int j=0;j<a.length;j++){ System.out.println(a[j]); } } } Result: array at the begining: 2 4 5 7 8 11 13 12 14 24 reversed array: 24 14 12 13 11 8 7 5 4 2

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• How do I do a .count on the model an object belongs_to in rails?

  - by Angela

  I have @contacts_added defined as follows: @contacts_added = Contact.all(:conditions => ["date_entered >?", 5.days.ago.to_date]) Each contact belongs_to a Company. I want to be able the count the number of distinct Companies that @contacts_added belong to. contacts_added will have many contacts that belong to a single company, accessible through a virtual attribute contacts_added.company_name How do I do that?

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• I am getting duplicates in UITableView, cellForRowAtIndexPath

  - by Martol1ni

  I am getting duplicates of my array, and wrongly displayed cells in this method: Here I am initializing the array, and adding it to the tableView: NSArray *sectionsArray = [NSArray arrayWithObjects: @"Location", @"Front Post", @"Front Fixing", @"Front Footplate", @"Rear Post", @"Read Fixing", @"Rear Footplate", @"Horizontal Bracing", @"Diagonal Bracing", @"Front Beam", @"Front Lock", @"Rear Beam", @"Rear Lock", @"Guard", @"Accessories", @"Comments", @"Off load ref", @"Loc Empty", @"Loc Affected", nil]; [_tableArray setObject:sectionsArray atIndexedSubscript:2]; [_tableView reloadData]; For some weird reason there are always the 4th object that is messed up, and is either duplicated, or do not have the views from IB. Here is the cellForRowAtIndexPath: method: - (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell; if (indexPath.section == 2) { cell = [tableView dequeueReusableCellWithIdentifier:@"EntryCell"]; cell.tag = indexPath.row; UILabel *label = (UILabel *)[cell viewWithTag:3]; [label setText:[[_tableArray objectAtIndex:2] objectAtIndex:indexPath.row]]; } return cell; } I have logged the string [[_tableArray objectAtIndex:2] objectAtIndex:indexPath.row], and it logs the right string.

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• How to remove strings of certain lengths

  - by Macosx Iam

  So I have this array, and I want to delete strings that are 2 or 4 characters in length (strings that contain 2 or 4 characters). I am doing this method, and it doesn't work, even though logically, it SHOULD work. public static void main(String[] args) { ArrayList<String> list = new ArrayList<String>(); list.add("This"); list.add("is"); list.add("a"); list.add("test"); for (int i=0; i<list.size(); i++) { if(list.get(i).length()==2 || list.get(i).length()==4) { list.remove(i); } } } I'd like to stick to this method of doing it. Can you please give me some suggestions as to how to correct this code? The output of this code when I run it is: [is, a] Even though I want the output to be [a] because "is" is 2 characters long.

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• Problem with generics

  - by jess

  I have this code in base class protected virtual bool HasAnyStuff<TObject>(TObject obj) where TObject:class { return false; } In child class I am overriding protected override bool HasAnyStuff<Customer>(Customer obj) { //some stuff if Customer.sth etc return false; } I am getting this error '''Type parameter declaration must be an identifier not a type''' What is it I am doing wrong here?

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• Javascript running improperly?

  - by TruthStands

  I have a Javascript function that is called from the onchange method in a DropDownList. However I'm getting the error "Cannot have multiple items selected in a DropDownList." on line 14. This happens when the page is reloaded for other purposes. Why is it getting hung here when the method shouldn't even be getting called? Line 12: { Line 13: var hfSelected = document.getElementById("<%=hfSelectedValue.ClientID%>"); Line 14: var ddlExposure = document.getElementById("<%=ddlExposure.ClientID%>"); Line 15: hfSelected.value = ddlExposure.options[ddlExposure.selectedIndex].text + "|" + ddlExposure.options[ddlExposure.selectedIndex].value; Line 16: }

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• C++ methods which take templated classes as argument.

  - by Nils

  I have a templated class Vector<class T, int N> Where T is the type of the components (double for example) and n the number of components (so N=3 for a 3D vector) Now I want to write a method like double findStepsize(Vector<double,2> v) {..} I want to do this also for three and higher dimensional vectors. Of course I could just introduce further methods for higher dimensions, but the methods would have a lot of redundant code, so I want a more generic solution. Is there a way to create a method which takes a templated class without further specializing it (in this case without specifying T or N)? Like double findStepsize(Vector<T,N> v) ?

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• Is it possible to get the current request that is being served by node.js?

  - by user420504

  I am using express.js. I have a need to be able to log certain request data whenever someone tries to log a message. For this I would like to create a helper method like so function log_message(level, message){ winston.log(level, req.path + "" + message); } I would then use the method like so. exports.index = function(req, res){ log_message("info", "I'm here"); } Note that I am not passing the req object to the log_message function. I want that to be transparently done so that the log_message API user does not need to be aware of the common data that is being logged. Is there a way to achieve this with express.js/node.js. Is the request object available from a global variable of some sort?

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