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• Will the following NHibernate interface mapping work?

  - by Ben Aston

  I'd like to program against interfaces when working with NHibernate due to type dependency issues within the solution I am working with. SO questions such as this indicate it is possible. I have an ILocation interface and a concrete Location type. Will the following work? HBM mapping: <class name="ILocation" abstract="true" table="ILocation"> <id name="Id" type="System.Guid" unsaved-value="00000000-0000-0000-0000-000000000000"> <column name="LocationId" /> <generator class="guid" /> </id> <union-subclass table="Location" name="Location"> <property name="Name" type="System.String"/> </union-subclass> </class> Detached criteria usage using the interface: var criteria = DetachedCriteria.For<ILocation>().Add(Restrictions.Eq("Name", "blah")); var locations = criteria.GetExecutableCriteria(UoW.Session).List<ILocation>(); Are there any issues with not using the hilo ID generator and/or with this approach in general?

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• Redirect to another action in an interceptor in struts 2

  - by user292662

  I am currently in the process of learning Struts 2 and I am currently building a simple application where unverified users are redirected to a login form. I have a login form and action functional which takes the users credentials, verifies them and stores a User object in the session however I am now trying to prevent access to pages before the login has taken place and I am trying to do this with an interceptor. My problem is that I have written an interceptor that checks whether the User object has been saved in the session but if it has not I want to redirect to the login page and can't find any way of doing this without bypassing struts and using the HttpServletResponse.sendRedirect method Configuration: <package name="mypackage" extends="struts-default" namespace="/admin"> <interceptors> <interceptor name="login" class="my.LoginInterceptor" /> </interceptors> <default-interceptor-ref name="login"/> <action name="login" class="my.LoginAction"> <result name="input">/admin/login.jsp</result> <result name="success" type="redirect">/admin</result> </action> <action name="private" class="my.PrivateAction"> <result>/admin/private.jsp</result> </action> </package> The interceptor code: @Override public String intercept(ActionInvocation inv) throws Exception { Map<String, Object> session = inv.getInvocationContext().getSession(); Object user = session.get("user"); if(user == null) { // redirect to the 'login' action here } else { return inv.invoke(); } }

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• Colour manipulation of custom tags in niceEdit HTML editor ( JS / DOM )

  - by Chris

  Hi, I would like to be able to highlight, during typing and in real time, certain custom tags in the format #tag_name# within the text of a nicEdit instance ( http://nicedit.com/ ). My current attempt to implement as close to this as possible revolves around using the blur event of the editor to highlight the tags once the editor loses focus. I then use the following logic to wrap the tags in a span with a highlight class.. htmlEditor.addEvent( "blur", function( ) { str = nicEditors.findEditor( "html_content" ).getContent( ); // Remove existing spans first, leaving just the tag ( this could mess up if the html has been edited directly ) str = str.replace( /(<span class=\"highlight\">)(.[^<]+)(<\/span>)/gi, "$2" ); // Then wrap all instances of a particular tag with the highlight span str = str.replace( /#tag_name#/gi, "<span class='highlight'>#tag_name#</span>" ); nicEditors.findEditor( "html_content" ).setContent( str ); }); This is not ideal as my actual text now contains unwanted spans ( I only want the highlighting for the user's input experience, not to be saved to the database ). Obviously I could remove the spans before saving the text but the whole system is currently open to errors ( If the html is directly edited then other text may get highlighted etc ). What I would like to know is.. Is there any way to directly change the colour of the tags in the editor or DOM without using a mechanism such as this? Perhaps a way of colouring the text in memory rather than changing the HTML ? Any ideas ? Regards Chris P

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• Java and dynamic variables

  - by Arvanem

  Hi folks, I am wondering whether it is possible to make dynamic variables in Java. In other words, variables that change depending on my instructions. FYI, I am making a trading program. A given merchant will have an array of items for sale for various prices. The dynamism I am calling for comes in because each category of items for sale has its own properties. For example, a book item has two properties: int pages, and boolean hardCover. In contrast, a bookmark item has one property, String pattern. Here are skeleton snippets of code so you can see what I am trying to do: public class Merchants extends /* certain parent class */ { // only 10 items for sale to begin with Stock[] itemsForSale = new Stock[10]; // Array holding Merchants public static Merchants[] merchantsArray = new Merchants[maxArrayLength]; // method to fill array of stock goes here } and public class Stock { int stockPrice; int stockQuantity; String stockType; // e.g. book and bookmark // Dynamic variables here, but they should only be invoked depending on stockType int pages; boolean hardCover; String pattern; }

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• Is this an example of LINQ-to-SQL?

  - by Edward Tanguay

  I made a little WPF application with a SQL CE database. I built the following code with LINQ to get data out of the database, which was surprisingly easy. So I thought "this must be LINQ-to-SQL". Then I did "add item" and added a "LINQ-to-SQL classes" .dbml file, dragged my table onto the Object Relational Designer but it said, "The selected object uses an unsupported data provider." So then I questioned whether or not the following code actually is LINQ-to-SQL, since it indeed allows me to access data from my SQL CE database file, yet officially "LINQ-to-SQL" seems to be unsupported for SQL CE. So is the following "LINQ-to-SQL" or not? using System.Linq; using System.Data.Linq; using System.Data.Linq.Mapping; using System.Windows; namespace TestLinq22 { public partial class Window1 : Window { public Window1() { InitializeComponent(); MainDB db = new MainDB(@"Data Source=App_Data\Main.sdf"); var customers = from c in db.Customers select new {c.FirstName, c.LastName}; TheListBox.ItemsSource = customers; } } [Database(Name = "MainDB")] public class MainDB : DataContext { public MainDB(string connection) : base(connection) { } public Table<Customers> Customers; } [Table(Name = "Customers")] public class Customers { [Column(DbType = "varchar(100)")] public string FirstName; [Column(DbType = "varchar(100)")] public string LastName; } }

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• Creating LINQ to SQL Data Models' Data Contexts with ASP.NET MVC

  - by Maxim Z.

  I'm just getting started with ASP.NET MVC, mostly by reading ScottGu's tutorial. To create my database connections, I followed the steps he outlined, which were to create a LINQ-to-SQL dbml model, add in the database tables through the Server Explorer, and finally to create a DataContext class. That last part is the part I'm stuck on. In this class, I'm trying to create methods that work around the exposed data. Following the example in the tutorial, I created this: using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace MySite.Models { public partial class MyDataContext { public List<Post> GetPosts() { return Posts.ToList(); } public Post GetPostById(int id) { return Posts.Single(p => p.ID == id); } } } As you can see, I'm trying to use my Post data table. However, it doesn't recognize the "Posts" part of my code. What am I doing wrong? I have a feeling that my problem is related to my not adding the data tables correctly, but I'm not sure. Thanks in advance.

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• Spring MVC: How to resolve the path to subdirectories of the root 'JSP' folder in a web application

  - by chrisjleu

  What is a simple way to resolve the path to a JSP file that is not located in the root JSP directory of a web application using SpringMVCs viewResolvers? For example, suppose we have the following web application structure: web-app |-WEB-INF |-jsp |-secure |-admin.jsp |-admin2.jsp index.jsp login.jsp I would like to use some out-of-the-box components to resolve the JSP files within the jsp root folder and the secure subdirectory. I have a *-servlet.xml file that defines: an out-of-the-box, InternalResourceViewResolver: <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property> <property name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> a handler mapping: <bean id="handlerMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/index.htm">urlFilenameViewController</prop> <prop key="/login.htm">urlFilenameViewController</prop> <prop key="/secure/**">urlFilenameViewController</prop> </props> </property> </bean> an out-of-the-box UrlFilenameViewController controller: <bean id="urlFilenameViewController" class="org.springframework.web.servlet.mvc.UrlFilenameViewController"> </bean> The problem I have is that requests to the JSPs in the secure directory cannot be resolved, as the jspViewResolver only has a prefix defined as /jsp/ and not /jsp/secure/. Is there a way to handle subdirectories like this? I would prefer to keep this structure because I'm also trying to make use of Spring Security and having all secure pages in a subdirectory is a nice way to do this. There's probably a simple way to acheive this but I'm new to Spring and the Spring MVC framework so any pointers would be appreciated.

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• ASP.NET MVC PartialView generic ModelView

  - by Greg Ogle

  I have an ASP.NET MVC application which I want to dynamically pick the partial view and what data gets passed to it, while maintaining strong types. So, in the main form, I want a class that has a view model that contains a generically typed property which should contain the data for the partial view's view model. public class MainViewModel<T> { public T PartialViewsViewModel { get; set; } } In the User Control, I would like something like: Inherits="System.Web.Mvc.ViewUserControl<MainViewModel<ParticularViewModel>>" %> Though in my parent form, I must put Inherits="System.Web.Mvc.ViewPage<MainViewModel<ParticularViewModel>>" %> for it to work. Is there a way to work around this? The use case is to make the user control pluggable. I understand that I could inherit a base class, but that would put me back to having something like a dictionary instead of a typed view model.

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• jsTree: How to create a new ID for the new added node?

  - by marknt15

  Hi, I can normally get the ID of the default tree nodes but my problem is onCreate then jsTree will add a new node but it doesn't have an ID. My question is how can I add an ID to the newly created tree node? What I'm thinking to do is adding the ID HTML attribute to the newly created tree node but how? I need to get the ID of all of the nodes because it will serve as a reference for the node's respective div storage. HTML code: <div class="demo" id="demo_1"> <ul> <li id="phtml_1" class="file"><a href="#"><ins>&nbsp;</ins>Root node 1</a></li> <li id="phtml_2" class="file"><a href="#"><ins>&nbsp;</ins>Root node 2</a></li> </ul> </div> JS code: $("#demo_1").tree({ ui : { theme_name : "apple" }, callback : { onrename : function (NODE, TREE_OBJ) { alert(TREE_OBJ.get_text(NODE)); alert($(NODE).attr('id')); } } }); Cheers, Mark

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• jquery change image on mouse rollover

  - by Craig Rinde

  I have been having problems with this. I think this should be pretty simple but I cannot seem to get it to work. I want a new image to appear when rolling over my facebook button. Thanks for your help! <p align="right"> <a href="http://www.facebook.com/AerialistPress" ><img height="30px" id="facebook" class="changePad" alt="Aerialist Press Facebook Page" src="/sites/aerialist.localhost/files/images/facebook300.jpg" /></a> <a href="http://twitter.com/#!/AerialistPress" > <img height="30px" class="changePad" alt="Aerialist Press Twitter Page" src="/sites/aerialist.localhost/files/images/twitter300.jpg" /></a> <a href="http://www.pinterest.com/aerialistpress" ><img height="30px" class="changePad" alt="Aerialist Press Pinterest Page" src="/sites/aerialist.localhost/files/images/pinterest300.jpg" /></a> </p> <script> jQuery(document).ready(function(){ jQuery('#facebook').mouseover(function() { jQuery('#facebook').attr('src').replace('/sites/aerialist.localhost/files/images/facebook-roll.jpg'); }) }); </script>

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• nHibernate Mapping file

  - by bharat

  <property name="NetworkRunId" column="Network_Run_Id" /> <property name="StudyKey" column="Study_Key" insert="false" update="false" /> <property name="AnnualizationFactor" column="Annualization_Factor" /> <property name="CreateDate" column="Create_Date" /> <property name="ModifyDate" column="Modify_Date" /> <many-to-one name="StudyInfo" class="Study" lazy="false" cascade="save-update"> <column name="Study_Key" /> </many-to-one> <many-to-one name="MemberInfo" class="BusinessDataEntities.Domain.NetworkAdministration.VHAMemberCompany, BusinessDataEntities" lazy="false"> <column name="Member_ID" /> </many-to-one> <many-to-one name="NetworkRunStudyXrefInfo" class="BusinessDataEntities.Domain.NetworkAdministration.NetworkRunStudyXref, BusinessDataEntities" lazy="false"> <column name="Network_Run_Id" /> </many-to-one> <join table="[HCO_Spend_Network_Run_Study]"> <key column="HCO_Spend_Id" /> <property name="NetworkRunId" column="Network_Run_Id" insert="false" update="false"/> </join> issue with the Network run id not exist in the first table but i have a join that is having the Network_Run_Id as property how do i fix this

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• Consistent Equals() results, but inconsistent TreeMap.containsKey() result

  - by smessing

  I have the following object Node: private class Node implements Comparable<Node>(){ private String guid(); ... public boolean equals(Node o){ return (this == o); } public int hashCode(){ return guid.hashCode(); } ... } And I use it in the following TreeMap: TreeMap<Node, TreeSet<Edge>> nodes = new TreeMap<Node, TreeSet<Edge>>(); Now, the tree map is used in a class called Graph to store nodes currently in the graph, along with a set of their edges (from the class Edge). My problem is when I try to execute: public containsNode(n){ for (Node x : nodes.keySet()) { System.out.println("HASH CODE: "); System.out.print(x.hashCode() == n.hashCode()); System.out.println("EQUALS: "); System.out.print(x.equals(n)); System.out.println("CONTAINS: "); System.out.print(nodes.containsKey(n)); System.out.println("N: " + n); System.out.println("X: " + x); } } I sometimes get the following: HASHCODE: true EQUALS: true CONTAINS: false N: foo X: foo Anyone have an idea as to what I'm doing wrong? I'm still new to all this, so I apologize in advance if I'm overlooking something simple (I know hashCode() doesn't really matter for TreeMap, but I figured I'd include it).

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• Rate limiting a ruby file stream

  - by Matthew Savage

  I am working on a project which involves uploading flash video files to a S3 bucket from a number of geographically distributed nodes. The video files are about 2-3mb each, and we are only sending one file (per node) every ten minutes, however the bandwidth we consume needs to be rate limited to ~20k/s, as these nodes are delivering streaming media to a CDN, and due to the locations we are only able to get 512k max upload. I have been looking into the ASW-S3 gem and while it doesn't offer any kind of rate limiting I am aware that you can pass in a IO Stream. Given this I am wondering if it might be possible to create a rate-limited stream which overrides the read method, adds in the rate limiting logic (e.g. in its simplest form a call to sleep between reads) and then call out to the super of the overridden method. Another option I considered is hacking the code for Net::HTTP and putting the rate limiting into the send_request_with_body_stream method which is using a while loop, but I'm not entirely sure which would be the best option. I have attempted at extending the IO class, however that didn't work at all, simply inheriting from the class with class ThrottledIO < IO didn't do anything. Any suggestions will be greatly appreciated.

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• Django ModelForm is giving me a validation error that doesn't make sense

  - by River Tam

  I've got a ModelForm based on a Picture. class Picture(models.Model): name = models.CharField(max_length=100) pub_date = models.DateTimeField('date published') tags = models.ManyToManyField('Tag', blank=True) content = models.ImageField(upload_to='instaton') def __unicode__(self): return self.name class PictureForm(forms.ModelForm): class Meta: model = Picture exclude = ('pub_date','tags') That's the model and the ModelForm, of course. def submit(request): if request.method == 'POST': # if the form has been submitted form = PictureForm(request.POST) if form.is_valid(): return HttpResponseRedirect('/django/instaton') else: form = PictureForm() # blank form return render_to_response('instaton/submit.html', {'form': form}, context_instance=RequestContext(request)) That's the view (which is being correctly linked to by urls.py) Right now, I do nothing when the form submits. I just check to make sure it's valid. If it is, I forward to the main page of the app. <form action="/django/instaton/submit/" method="post"> {% csrf_token %} {{ form.as_p }} <input type="submit" value"Submit" /> </form> And there's my template (in the correct location). When I try to actually fill out the form and just validate it, even if I do so correctly, it sends me back to the form and says "This field is required" between Name and Content. I assume it's referring to Content, but I'm not sure. What's my problem? Is there a better way to do this?

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• Ajax Form submittion in Google App Engine with jQuery

  - by user271785

  could not figure out why it is not working: i need to send request to server, generate some fragment of html in python with meanCal method, and then want that fragment embedded into submitting html file using calculation method and dynamically shows in dyContent div. all the processes are done by single click on submit button in a form. any suggestions??? thanks in advance. the submitting html: <div id="dyContent" style="height: 200px;"> waiting for user... {{ mgs }} </div> <div id="leturetext"> <form id="mean" method="post" action="/calculation"> <select name="meanselect"> <option value=10>example</option> <option value=11>exercise</option> </select> <input type="button" name="btnMean" value="Check Results" /> </form> </div> <script type="text/javascript"> $(document).ready(function() { //$("#btnMean").live("click", function() { $("#mean").submit(function(){ $.ajax({ type: "POST", cache: false, url: "/meanCal", success: function(html) { $("#dyContent").html(html); } }); return false; }); }); </script> python: class MainHandler(webapp.RequestHandler): def get(self): path = self.request.path if doRender(self, path): return doRender(self,'index.htm') class calculationHandler(webapp.RequestHandler): def post(self): doRender(self, 'Diagnostic_stats.htm', {'mgs' : "refreshed.", }) def get(self): doRender(self, 'Diagnostic_stats.htm') class meanHandler(webapp.RequestHandler): def get(self): global GL index = self.request.get('meanselect'.value) if (index == 10): allData = GL.exampleData dataString = ','.join(map(str, allData)) dataMean = (str)(stats.lmean(allData)) doRender(self, 'Result.htm', { 'dataIn' : dataString, 'MEAN' : "Example Mean is: " + dataMean, }) return else: allData = GL.exerciseData dataString = ','.join(map(str, allData)) dataMean = (str)(stats.lmean(allData)) doRender(self, 'Result.htm', { 'dataIn' : dataString, 'MEAN' : "Exercise Mean is: " + dataMean, }) def main(): global GL GL = GlobalVariables() application = webapp.WSGIApplication( [('/calculation', calculationHandler), ('/meanCal', meanHandler), ('.*', MainHandler), ], debug=True) wsgiref.handlers.CGIHandler().run(application) if __name__ == '__main__': main()

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• Problems when handling orientation changes

  - by nixau

  Hi all, I need to handle orientation changes in my Android application. For this purpose I decided to use OrientationEventListener convenience class. But his callback method is given somewhat strange behavior. My application starts in the portrait mode and then eventually switches to the lanscape one. I have some custom code executing in the callback onOrientationChanged method that provides some additional UI handling logic - it has a few calls to findViewById. What is strange is that when switching back from landscape to portrait mode onOrientationChanged callback is called twice, and what's even worse - the second call is dealing with bad Context - findViewById method starts returning null. These calls are made right from the MainThread @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); listener = new OrientationListener(); } @Override protected void onResume() { super.onResume(); // enabling listening listener.enable(); } @Override protected void onPause() { super.onPause(); // disabling listening listener.disable(); } I've replicated the same behavior with a dummy Activity without any logic except for one that deals with orientation hadling. I initiate orientation switch from the Android 2.2 emulator by pressing Ctrl+F11 What could be wrong? Upd: Inner class that implements OrientationEventListener private class OrientationListener extends OrientationEventListener { public OrientationL() { super(getBaseContext()); } @Override public void onOrientationChanged(int orientation) { toString(); } } }

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• Can a destructor be recursive?

  - by Cubbi

  Is this program well-defined, and if not, why exactly? #include <iostream> #include <new> struct X { int cnt; X (int i) : cnt(i) {} ~X() { std::cout << "destructor called, cnt=" << cnt << std::endl; if ( cnt-- > 0 ) this->X::~X(); // explicit recursive call to dtor } }; int main() { char* buf = new char[sizeof(X)]; X* p = new(buf) X(7); p->X::~X(); // explicit call to dtor delete[] buf; } My reasoning: although invoking a destructor twice is undefined behavior, per 12.4/14, what it says exactly is this: the behavior is undefined if the destructor is invoked for an object whose lifetime has ended Which does not seem to prohibit recursive calls. While the destructor for an object is executing, the object's lifetime has not yet ended, thus it's not UB to invoke the destructor again. On the other hand, 12.4/6 says: After executing the body [...] a destructor for class X calls the destructors for X's direct members, the destructors for X's direct base classes [...] which means that after the return from a recursive invocation of a destructor, all member and base class destructors will have been called, and calling them again when returning to the previous level of recursion would be UB. Therefore, a class with no base and only POD members can have a recursive destructor without UB. Am I right?

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• Extension methods conflict

  - by Yochai Timmer

  Lets say I have 2 extension methods to string, in 2 different namespaces: namespace test1 { public static class MyExtensions { public static int TestMethod(this String str) { return 1; } } } namespace test2 { public static class MyExtensions2 { public static int TestMethod(this String str) { return 2; } } } These methods are just for example, they don't really do anything. Now lets consider this piece of code: using System; using test1; using test2; namespace blah { public static class Blah { public Blah() { string a = "test"; int i = a.TestMethod(); //Which one is chosen ? } } } I know that only one of the extension methods will be chosen. Which one will it be ? and why ? How can I choose a certain method from a certain namespace ? Edit: Usually I'd use Namespace.ClassNAME.Method() ... But that just beats the whole idea of extension methods. And I don't think you can use Variable.Namespace.Method()

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• jquery 'this' confusion

  - by Elliott

  Hi I have the code below, once the first (only) item in the menu is hovered over, the subtext should appear. I have used 'this' as I thought it should find the class with the "li" and then slideDown. This doesnt seem to work, although 'this' works for when you remove the hover, as it slides up (top part not the subtext). <body> <script type="text/javascript"> $(document).ready(function() { $('li').hover(function() { $(this).stop(true, true).slideDown(); $(this).slideDown("slow"); }, function () { $(this).slideUp("fast"); } ); }); </script> <ul> <li class="hover"> <p><a href="#">Hover</a></p> <p class="subtext">Show More</p> </li> </ul> Any advice? Thanks

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• Jquery Using Jeditable and activating on click

  - by BandonRandon

  I found this to be almost exactly what I'm trying to do. I'm using Jeditable I can get the default setup to work. I've also been able to get the code in the forum above to work. I believe my problem is that because I'm using a table I need to so something else to select the previous element. Here is my HTML <table> <tr> <td width="5%"><input class="cat_checkbox" type="checkbox" name='delete_cat[]' value='<?php echo("$cat_data[cat_id]");?>' /></td> <td width="90%" class="edit_cat_title" id='unique_id'>Category</td> <td width="5%"><a href="#" class="edit_cat_title_trigger"><img src="images/edit.gif" border="0"></a></td> </tr> </table> and here is my JQuery: //modify title content on the fly $('.edit_cat_title').editable('action.php', { name : 'cat_title', indicator : 'Saving...', submit : 'OK', cancel : 'Cancel', tooltip:'click to edit', event : 'edit' }); //trigger with the click of the edit image $(".edit_cat_title_trigger").bind("click", function() { $(this).prev().trigger("edit_cat_title"); }); I know I probably should be able to figure it out and I know all i have to do is change $(this).prev().trigger("edit_cat_title"); to the right thing but I'm still really new to Jquery. Thanks

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• Simple Java Applet not loading in FireFox / Safari on MacOS

  - by Sleepless

  Hello all, I'm probably missing something very basic here. I'm trying to get my first applet to run inside a local HTML page in Firefox 3.6 on Mac OS 10.5.8. Here's the applet's code: package SimpleApplet; import java.applet.Applet; import java.awt.*; public class MyApplet extends Applet { private static final long serialVersionUID = 1L; public void init() { } public void stop() { } public void paint(Graphics g) { g.drawString("Tweedle-Dee!",20,40); } } Here's the HTML page: <html> <body> Here's the applet: <br/> <applet code="MyApplet.class" width="300" height="150"> </applet> </body> </html> Both files (.class and .html) are in the same folder on my local machine. Now when I load the .html file into Firefox, a rectangle with a red X gets displayed. The applet works when started from Eclipse (using JRE 1.5 BTW). Also, it's not a general problem with my browser, as several pages with applets (e.g. http://java.sun.com/applets/jdk/1.4/demo/applets/Blink/example1.html) work. This is also difficult to troubleshoot because there is no output at all on the Java console... Any suggestions are appreciated!

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• ANTLR Tree Grammar and StringTemplate Code Translation

  - by Behrooz Nobakht

  I am working on a code translation project with a sample ANTLR tree grammar as: start: ^(PROGRAM declaration+) -> program_decl_tmpl(); declaration: class_decl | interface_decl; class_decl: ^(CLASS ^(ID CLASS_IDENTIFIER)) -> class_decl_tmpl(cid={$CLASS_IDENTIFIER.text}); The group template file for it looks like: group My; program_decl_tmpl() ::= << *WHAT?* >> class_decl_tmpl(cid) ::= << public class <cid> {} >> Based on this, I have these questions: Everything works fine apart from that what I should express in WHAT? to say that a program is simply a list of class declarations to get the final generated output? Is this approach averagely suitable for not so a high-level language? I have also studied ANTLR Code Translation with String Templates, but it seems that this approach takes much advantage of interleaving code in tree grammar. Is it also possible to do it as much as possible just in String Templates?

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• SpringMvc Annotations for DAO interface and DAO implementation

  - by dev_darin

  I would like to know if I am annotating these classes correctly, since I am new to the annotations: Country.java @Component public class Country { private int countryId; private String countryName; private String countryCode; /** * No args constructor */ public Country() { } /** * @param countryId * @param countryName * @param countryCode */ public Country(int countryId, String countryName, String countryCode) { this.countryId = countryId; this.countryName = countryName; this.countryCode = countryCode; } //getters and setters } CountryDAO.java @Repository public interface CountryDAO { public List<Country> getCountryList(); public void saveCountry(Country country); public void updateCountry(Country country); } JdbcCountryDAO.java @Component public class JdbcCountryDAO extends JdbcDaoSupport implements CountryDAO{ private final Logger logger = Logger.getLogger(getClass()); @Autowired public List<Country> getCountryList() { int countryId = 6; String countryCode = "AI"; logger.debug("In getCountryList()"); String sql = "SELECT * FROM TBLCOUNTRY WHERE countryId = ? AND countryCode = ?"; logger.debug("Executing getCountryList String "+sql); Object[] parameters = new Object[] {countryId, countryCode}; logger.info(sql); //List<Country> countryList = getJdbcTemplate().query(sql,new CountryMapper()); List<Country> countryList = getJdbcTemplate().query(sql, parameters,new CountryMapper()); return countryList; } CountryManagerIFace.java @Repository public interface CountryManagerIFace extends Serializable{ public void saveCountry(Country country); public List<Country> getCountries(); } CountryManager.java @Component public class CountryManager implements CountryManagerIFace{ @Autowired private CountryDAO countryDao; public void saveCountry(Country country) { countryDao.saveCountry(country); } public List<Country> getCountries() { return countryDao.getCountryList(); } public void setCountryDao(CountryDAO countryDao){ this.countryDao = countryDao; } }

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• Avoiding anemic domain model - a real example

  - by cbp

  I am trying to understand Anemic Domain Models and why they are supposedly an anti-pattern. Here is a real world example. I have an Employee class, which has a ton of properties - name, gender, username, etc public class Employee { public string Name { get; set; } public string Gender { get; set; } public string Username { get; set; } // Etc.. mostly getters and setters } Next we have a system that involves rotating incoming phone calls and website enquiries (known as 'leads') evenly amongst sales staff. This system is quite complex as it involves round-robining enquiries, checking for holidays, employee preferences etc. So this system is currently seperated out into a service: EmployeeLeadRotationService. public class EmployeeLeadRotationService : IEmployeeLeadRotationService { private IEmployeeRepository _employeeRepository; // ...plus lots of other injected repositories and services public void SelectEmployee(ILead lead) { // Etc. lots of complex logic } } Then on the backside of our website enquiry form we have code like this: public void SubmitForm() { var lead = CreateLeadFromFormInput(); var selectedEmployee = Kernel.Get<IEmployeeLeadRotationService>() .SelectEmployee(lead); Response.Write(employee.Name + " will handle your enquiry. Thanks."); } I don't really encounter many problems with this approach, but supposedly this is something that I should run screaming from because it is an Anemic Domain Model. But for me its not clear where the logic in the lead rotation service should go. Should it go in the lead? Should it go in the employee? What about all the injected repositories etc that the rotation service requires - how would they be injected into the employee, given that most of the time when dealing with an employee we don't need any of these repositories?

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• NHibernate IQueryable Collection as Property of Root

  - by Khalid Abuhakmeh

  Hello and thank you for taking the time to read this. I have a root object that has a property that is a collection. For example : I have a Shelf object that has Books. // now public class Shelf { public ICollection<Book> Books {get; set;} } // want public class Shelf { public IQueryable<Book> Books {get;set;} } What I want to accomplish is to return a collection that is IQueryable so that I can run paging and filtering off of the collection directly from the the parent. var shelf = shelfRepository.Get(1); var filtered = from book in shelf.Books where book.Name == "The Great Gatsby" select book; I want to have that query executed specifically by NHibernate and not a get all to load a whole collection and then parse it in memory (which is what currently happens when I use ICollection). The reasoning behind this is that my collection could be huge, tens of thousands of records, and a get all query could bash my database. I would like to do this implicitly so that when NHibernate sees and IQueryable on my class it knows what to do. I have looked at NHibernates Linq provider and currently I am making the decision to take large collections and split them into their own repository so that I can make explicit calls for filtering and paging. Linq To SQL offers something similar to what I'm talking about.

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