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• java serialization problems with different JVMs

  - by Alberto

  I am having trouble using serialization in Java. I've searched the web for a solution but haven't found an answer yet. The problem is this - I have a Java library (I have the code and I export it to an archive prior to executing the code) which I need to use with two differents JVMs. One JVM is on the server (Ubuntu, running Java(TM) JRE SE Runtime Environment (build 1.7.0_09-b05)) and the other on Android 2.3.3. I compiled the library in Java 1.6. Now, I am trying to import to the client, an object exported from the server, but I receive this error: java.io.InvalidClassException: [Lweka.classifiers.functions.MultilayerPerceptron$NeuralEnd;; Incompatible class (SUID): [Lweka.classifiers.functions.MultilayerPerceptron$NeuralEnd;: static final long serialVersionUID =-359311387972759020L; but expected [Lweka.classifiers.functions.MultilayerPerceptron$NeuralEnd;: static final long serialVersionUID =1920571045915494592L; I do have an explicit serial version UID declared on the class MultilayerPerceptron$NeuralEnd, like this: protected class NeuralEnd extends NeuralConnection { private static final long serialVersionUID = 7305185603191183338L; } Where NeuralConnection implements the java.io.Serializable interface. If I do a serialver on MultilayerPerceptron$NeuralEnd I receive the serialVersionUID which I declared. So, why have both JVMs changed this value? Can you help me? Thanks, Alberto

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• database design to speed up hibernate querying of large dataset

  - by paddydub

  I currently have the below tables representing a bus network mapped in hibernate, accessed from a Spring MVC based bus route planner I'm trying to make my route planner application perform faster, I load all the above tables into Lists to perform the route planner logic. I would appreciate if anyone has any ideas of how to speed my performace Or any suggestions of another method to approach this problem of handling a large set of data Coordinate Connections Table (INT,INT,INT)( Containing 50,000 Coordinate Connections) ID, FROMCOORDID, TOCOORDID 1 1 2 2 1 17 3 1 63 4 1 64 5 1 65 6 1 95 Coordinate Table (INT,DECIMAL, DECIMAL) (Containing 4700 Coordinates) ID , LAT, LNG 0 59.352669 -7.264341 1 59.352669 -7.264341 2 59.350012 -7.260653 3 59.337585 -7.189798 4 59.339221 -7.193582 5 59.341408 -7.205888 Bus Stop Table (INT, INT, INT)(Containing 15000 Stops) StopID RouteID COORDINATEID 1000100001 100 17 1000100002 100 18 1000100003 100 19 1000100004 100 20 1000100005 100 21 1000100006 100 22 1000100007 100 23 This is how long it takes to load all the data from each table: stop.findAll = 148ms, stops.size: 15670 Hibernate: select coordinate0_.COORDINATEID as COORDINA1_2_, coordinate0_.LAT as LAT2_, coordinate0_.LNG as LNG2_ from COORDINATES coordinate0_ coord.findAll = 51ms , coordinates.size: 4704 Hibernate: select coordconne0_.COORDCONNECTIONID as COORDCON1_3_, coordconne0_.DISTANCE as DISTANCE3_, coordconne0_.FROMCOORDID as FROMCOOR3_3_, coordconne0_.TOCOORDID as TOCOORDID3_ from COORDCONNECTIONS coordconne0_ coordinateConnectionDao.findAll = 238ms ; coordConnectioninates.size:48132 Hibernate Annotations @Entity @Table(name = "STOPS") public class Stop implements Serializable { @Id @GeneratedValue @Column(name = "COORDINATEID") private Integer CoordinateID; @Column(name = "LAT") private double latitude; @Column(name = "LNG") private double longitude; } @Table(name = "COORDINATES") public class Coordinate { @Id @GeneratedValue @Column(name = "COORDINATEID") private Integer CoordinateID; @Column(name = "LAT") private double latitude; @Column(name = "LNG") private double longitude; } @Entity @Table(name = "COORDCONNECTIONS") public class CoordConnection { @Id @GeneratedValue @Column(name = "COORDCONNECTIONID") private Integer CoordinateID; /** * From Coordinate_id value */ @Column(name = "FROMCOORDID", nullable = false) private int fromCoordID; /** * To Coordinate_id value */ @Column(name = "TOCOORDID", nullable = false) private int toCoordID; //private Coordinate toCoordID; }

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• Can the Diamond Problem be really solved?

  - by Mecki

  A typical problem in OO programming is the diamond problem. I have parent class A with two sub-classes B and C. A has an abstract method, B and C implement it. Now I have a sub-class D, that inherits of B and C. The diamond problem is now, what implementation shall D use, the one of B or the one of C? People claim Java knows no diamond problem. I can only have multiple inheritance with interfaces and since they have no implementation, I have no diamond problem. Is this really true? I don't think so. See below: [removed vehicle example] Is a diamond problem always the cause of bad class design and something neither programmer nor compiler needs to solve, because it shouldn't exist in the first place? Update: Maybe my example was poorly chosen. See this image Of course you can make Person virtual in C++ and thus you will only have one instance of person in memory, but the real problem persists IMHO. How would you implement getDepartment() for GradTeachingFellow? Consider, he might be student in one department and teach in another one. So you can either return one department or the other one; there is no perfect solution to the problem and the fact that no implementation might be inherited (e.g. Student and Teacher could both be interfaces) doesn't seem to solve the problem to me.

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• Extend base type and automatically update audit information on Entity

  - by Nix

  I have an entity model that has audit information on every table (50+ tables) CreateDate CreateUser UpdateDate UpdateUser Currently we are programatically updating audit information. Ex: if(changed){ entity.UpdatedOn = DateTime.Now; entity.UpdatedBy = Environment.UserName; context.SaveChanges(); } But I am looking for a more automated solution. During save changes, if an entity is created/updated I would like to automatically update these fields before sending them to the database for storage. Any suggestion on how i could do this? I would prefer to not do any reflection, so using a text template is not out of the question. A solution has been proposed to override SaveChanges and do it there, but in order to achieve this i would either have to use reflection (in which I don't want to do ) or derive a base class. Assuming i go down this route how would I achieve this? For example EXAMPLE_DB_TABLE CODE NAME --Audit Tables CREATE_DATE CREATE_USER UPDATE_DATE UPDATE_USER And if i create a base class public abstract class IUpdatable{ public virtual DateTime CreateDate {set;} public virtual string CreateUser { set;} public virtual DateTime UpdateDate { set;} public virtual string UpdateUser { set;} } The end goal is to be able to do something like... public overrride void SaveChanges(){ //Go through state manager and update audit infromation //FOREACH changed entity in state manager if(entity is IUpdatable){ //If state is created... update create audit. //if state is updated... update update audit } } But I am not sure how I go about generating the code that would extend the interface.

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• Namespace Problem

  - by Tarik

  Hello, Normally we all do use using System.Linq; and using System.Data.Linq; for example on the code-behind and expect we can reach the members of these namespaces from Source Code like <%= Something.First()%> but when I wrote it, asp.net said it couldn't find First() in the context and I had to add <%@ Import Namespace="System.Linq" which looked very weird to me but it worked out. Since they are targeting at the same class why they both need separate namespace importing. Code-behind : using System; using System.Data.Linq; using System.Linq; using System.Text namespace Something { class Items : System.Web.UI { //... } } but also I need to add the same Linq namespace on the Html Source part <%@Import Namespace="System.Linq"%> Do I know something wrong or this is some kind of bug in asp.net. I thought when the page is compiling, asp.net combines these two classes and converts html source code into cs class and indicates the control in Control c= new Control(); hierarchy. Thanks in advance.

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• magento - multilingual site + Add store codes to url - want to show flag icons

  - by Mustapha George

  I want to have a multi-language magento site use a flag image instead of a language selector box for user to select language of page. There is a nice article on this at http://www.atwix.com/magento/replace-language-selector-flag-icons/ Only issue is that we use "Add store codes to url" option. I hacked this code, but it can use some refinement and make it more Magento looking. <?php if(count($this->getStores())>1): ?> <div class="form-language"> <div class="langs-wrapper"> <?php foreach ($this->getStores() as $_lang): ?> <?php if ($_lang->getCode() != 'default'): ?> <? $base_url = Mage::getBaseUrl(); // remove language in base url $base_url = str_replace('/en/' , "" , $base_url); $base_url = str_replace('/fr/' , "" , $base_url); $current_url = $this->helper('core/url')->getCurrentUrl(); // take out base url and language code $rest_of_url = str_replace($base_url , "" , $current_url); $rest_of_url = str_replace('/en/' , "" , $rest_of_url); $rest_of_url = str_replace('/fr/' , "" , $rest_of_url); // assmble new url $new_url = $base_url . '/' . $_lang->getCode() . '/' . $rest_of_url; ?> <a class="lang-flag" href="<?php echo $new_url ;?>"><img src="<?php echo $this->getSkinUrl('images/flags/' . $_lang->getCode() . '.png');?>" alt=""></a> <?php endif;?> <?php endforeach;?> </div> </div> <?php endif;?>

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• Generating equals / hashcode / toString using annotation

  - by Bruno Bieth

  I believe I read somewhere people generating equals / hashcode / toString methods during compile time (using APT) by identifying which fields should be part of the hash / equality test. I couldn't find anything like that on the web (I might have dreamed it ?) ... That could be done like that : public class Person { @Id @GeneratedValue private Integer id; @Identity private String firstName, lastName; @Identity private Date dateOfBirth; //... } For an entity (so we want to exlude some fields, like the id). Or like a scala case class i.e a value object : @ValueObject public class Color { private int red, green, blue; } Not only the file becomes more readable and easier to write, but it also helps ensuring that all the attributes are part of the equals / hashcode (in case you add another attribute later on, without updating the methods accordingly). I heard APT isn't very well supported in IDE but I wouldn't see that as a major issue. After all, tests are mainly run by continuous integration servers. Any idea if this has been done already and if not why ? Thanks

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• How to test a DAO with JPA implementation ?

  - by smallufo

  Hi I came from the Spring camp , I don't want to use Spring , and am migrating to JavaEE6 , But I have problem testing DAO + JPA , here is my simplified sample : public interface PersonDao { public Person get(long id); } This is a very basic DAO , because I came from Spring , I believe DAO still have it value , so I decided to add a DAO layer . public class PersonDaoImpl implements PersonDao , Serializable { @PersistenceContext(unitName = "test", type = PersistenceContextType.EXTENDED) EntityManager entityManager ; public PersonDaoImpl() { } @Override public Person get(long id) { return entityManager .find(Person.class , id); } } This is a JPA-implemented DAO , I hope the EE container or the test container able to inject the EntityManager. public class PersonDaoImplTest extends TestCase { @Inject protected PersonDao personDao; @Override protected void setUp() throws Exception { //personDao = new PersonDaoImpl(); } public void testGet() { System.out.println("personDao = " + personDao); // NULL ! Person p = personDao.get(1L); System.out.println("p = " + p); } } This is my test file . OK , here comes the problem : Because JUnit doesn't understand @javax.inject.Inject , the PersonDao will not be able to injected , the test will fail. How do I find a test framework that able to inject the EntityManager to the PersonDaoImpl , and @Inject the PersonDaoImpl to the PersonDao of TestCase ? I tried unitils.org , but cannot find a sample like this , it just directly inject the EntityManagerFactory to the TestCast , not what I want ...

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• How to use a viewstate'd object as a datasource for controls on a user control

  - by user557325

  I've got a listview on a control. Each row comprises a checkbox and another listview. The outer listview is bound to a property on the control (via a method call, can't set a property as a SelectMethod on an ObjectDataSource it would appear) which is lazy loaded suchly: Public ReadOnly Property ProductLineChargeDetails() As List(Of WebServiceProductLineChargeDetail) Get If ViewState("WSProductLineChargeDetails") Is Nothing Then ViewState("WSProductLineChargeDetails") = GetWebServiceProductLineChargeDetails() End If Return DirectCast(ViewState("WSProductLineChargeDetails"), Global.System.Collections.Generic.List(Of Global.MI.Open.WebServiceProductLineChargeDetail)) End Get End Property The shape of the object referenced by the data source is something like this: (psuedocode) Product { bool Licenced; List<Charge> charges; } Charge { int property1; string property2; bool property3 . . . } The reason for the use of viewstate is this: When an one of the checkboxes on one of the outer list view rows is checked or unchecked I want to modify the object that the ODS represents (for example I'll add a couple of Charge objects to the relevant Product object) and then rebind. The problem I'm getting is that after every postback (specifically after checking or unchecking one of the rows' checkbox) my viewstate is empty. Thiss means that any changes I make to my viewstate'd object is lost. Now, I've worked out (after much googling and reading, amongst many others, Scott Mitchel's excellent bit on ViewState) that during initial databinding IsTrackingViewState is set to false. That means, I think, that assigning the return from GetWebServiceProductLineChargeDetails() to the ViewState item in my Property Get during the initial databind won't work. Mind you, even when the IsTrackingViewState is true and I call the Property Get, come the next postback, the viewstate is empty. So do you chaps have any ideas on how I keep the object referenced by the ObjectDataSource in ViewState between postbacks and update it and get those changes to stay in ViewState? This has been going on for a couple of days now and I'm getting fed up! Cheers in advance Steve

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• Huge mysql table with Zend Framework

  - by Uffo

  I have a mysql table with over 4 million of data; well the problem is that SOME queries WORK and SOME DON'T it depends on the search term, if the search term has a big volume of data in the table than I get the following error: Fatal error: Allowed memory size of 1048576000 bytes exhausted (tried to allocate 75 bytes) in /home/****/public_html/Zend/Db/Statement/Pdo.php on line 290 I currently have Zend Framework cache for metadata enabled, I have index on all the fields from that table.The site is running on a dedicated server with 2gb of ram. I've also set memory limit to: ini_set("memory_limit","1000M"); Any other things that I can optimize? Those are the types of query that I'm currently using: $do = $this->select() ->where('branche LIKE ?','%'.mysql_escape_string($branche).'%') ->order('premium DESC'); } //For name if(empty($branche) && empty($plz)) { $do = $this->select("MATCH(`name`) AGAINST ('{$theString}') AS score") ->where('MATCH(`name`) AGAINST( ? IN BOOLEAN MODE)', $theString) ->order('premium DESC, score'); } And a few other, but they are pretty much the same. Best Regards

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• jquery add to an array on click?

  - by KittyYoung

  I'm confused regarding each() and .each()... I think I need to use both, but I'm not sure how... Basically, I have a series of checkboxes and when they're checked, I want to get the id of the closest table row and add it to an array that I can then serialize and pass to a function. So, the html looks like this: <tr id="t1"><td><input type="checkbox" name="did[]" value="232" class="bd" /></td></tr> <tr id="t2"><td><input type="checkbox" name="did[]" value="234" class="bd" /></td></tr> <tr id="t3"><td><input type="checkbox" name="did[]" value="676" class="bd" /></td></tr> <tr><td><button id="tsid" name="tsid" type="button">Send</button></td></tr> And, when (and if) the checkbox is selected, I want to get the closest tr id and store it in an array: var trids = [] And then serialize the input data and the trids array... So far, I only have this: $('#tsid').click(function() { //meant to get the values of the selected checkboxes var myData = $('input[name=did[]]').serialize(); //meant to find and store the closest tr ids in an array... $('.bd').each(function() { var trids = $(this).closest("tr").get(0); //and now I'm lost... }); }

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• Deserializing a FileStream on Client using WCF

  - by Grandpappy

  I'm very new to WCF, so I apologize in advance if I misstate something. This is using .NET 4.0 RC1. Using WCF, I am trying to deserialize a response from the server. The base response has a Stream as its only MessageBodyMember. public abstract class StreamedResponse { [MessageBodyMember] public Stream Stream { get; set; } public StreamedResponse() { this.Stream = Stream.Null; } } The derived versions of this class are actually what's serialized, but they don't have a MessageBodyMember attribute (they have other base types such as int, string, etc listed as MessageHeader values). [MessageContract] public class ChildResponse : StreamedResponse { [DataMember] [MessageHeader] public Guid ID { get; set; } [DataMember] [MessageHeader] public string FileName { get; set; } [DataMember] [MessageHeader] public long FileSize { get; set; } public ChildResponse() : base() { } } The Stream is always a FileStream, in my specific case (but may not always be). At first, WCF said FileStream was not a known type, so I added it to the list of known types and now it serializes. It also appears, at first glance, to deserialize it on the client's side (it's the FileStream type). The problem is that it doesn't seem to be usable. All the CanRead, CanWrite, etc are false, and the Length, Position, etc properties throw exceptions when being used. Same with ReadByte(). What am I missing that would keep me from getting a valid FileStream?

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• Django Form Preview

  - by Mark Kecko

  I'm trying to use django's FormPreview and I can't get it to work properly. Here's my code: forms.py class MyForm(forms.ModelForm): status = forms.TypedChoiceField( coerce=int, choices=LIST_STATUS, label="type", widget=forms.RadioSelect ) description = forms.CharField(widget = forms.Textarea) stage = forms.CharField() def __init__(self, useradd=None, *args, **kwargs): super(MyForm, self).__init__(*args, **kwargs) self.fields['firm'].label = "Firm" class Meta: model = MyModel fields = ['status', 'description', 'stage'] class MyFormPreview(FormPreview): form_template = 'templates/post.html' preview_template = 'templates/review.html' def process_preview(self, request, cleaned_data): print "processed" def done(self, request, cleaned_data): print "done" # Do something with the cleaned_data, then redirect # to a "success" page. return HttpResponseRedirect('/') urls.py (r'^post/$', MyFormPreview(MyForm)), post.html <form id = "post_ad" action = "" method = "POST" enctype="multipart/form-data"> <table> {{form.as_table}} </table> <input type="submit" name="save" value="Post" /> </form> When I go to /post/ I get the correct form and I fill it out. When I submit the form it goes right back to /post/ but but there are no errors (I've tried displaying {{errors}}) and the form is empty. None of my print statements execute. I'm not sure what I'm missing. Can anyone help me out? I can't find any documentation besides what's on the django site. Also, what's the "preview" variable called that I should use in my preview.html template? {{preview}} or do I just do {{form}} again? -- Answered below. I tried adding 'django.contrib.formtools' to my installed_apps in settings and I tried using the code from the default form templates from django.contrib as suggested below. Still, when I submit the form I go right back to the post template, none of my print statements execute :(

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• Issue intercepting property in Silverlight application

  - by joblot

  I am using Ninject as DI container in a Silverlight application. Now I am extending the application to support interception and started integrating DynamicProxy2 extension for Ninject. I am trying to intercept call to properties on a ViewModel and ending up getting following exception: “Attempt to access the method failed: System.Reflection.Emit.DynamicMethod..ctor(System.String, System.Type, System.Type[], System.Reflection.Module, Boolean)” This exception is thrown when invocation.Proceed() method is called. I tried two implementations of the interceptor and they both fail public class NotifyPropertyChangedInterceptor: SimpleInterceptor { protected override void AfterInvoke(IInvocation invocation) { var model = (IAutoNotifyPropertyChanged)invocation.Request.Proxy; model.OnPropertyChanged(invocation.Request.Method.Name.Substring("set_".Length)); } } public class NotifyPropertyChangedInterceptor: IInterceptor { public void Intercept(IInvocation invocation) { invocation.Proceed(); var model = (IAutoNotifyPropertyChanged)invocation.Request.Proxy; model.OnPropertyChanged(invocation.Request.Method.Name.Substring("set_".Length)); } } I want to call OnPropertyChanged method on the ViewModel when property value is set. I am using Attribute based interception. [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)] public class NotifyPropertyChangedAttribute : InterceptAttribute { public override IInterceptor CreateInterceptor(IProxyRequest request) { if(request.Method.Name.StartsWith("set_")) return request.Context.Kernel.Get<NotifyPropertyChangedInterceptor>(); return null; } } I tested the implementation with a Console Application and it works alright. I also noted in Console Application as long as I had Ninject.Extensions.Interception.DynamicProxy2.dll in same folder as Ninject.dll I did not have to explicitly load DynamicProxy2Module into the Kernel, where as I had to explicitly load it for Silverlight application as follows: IKernel kernel = new StandardKernel(new DIModules(), new DynamicProxy2Module()); Could someone please help? Thanks

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• c# Deserializing an element based on it's parent node's name

  - by daveharnett

  The XML I'm working with has the following structure: <fixture_statistics> <home_player_1 id="2306143" teamid="2"> <element_1>Some Data</element_1> <element_2>Some Data</element_2> </home_player_1> <home_player_2 id="2306144" teamid="2"> <element_1>Some Data</element_1> <element_2>Some Data</element_2> </home_player_2> </fixture_statistics> Now the code to deserialize it would normally look like this: [XmlRootAttribute("fixture_statistics", Namespace = "", IsNullable = false)] public class FixtureRoot { [XmlElement("home_player_1")] [XmlElement("home_player_2")] public List<FixtureStats> fixtures { get; set; } } public class FixtureStats { public string element_1; [XMLElement("element_2")] public string elementTwo; } Here's the question: I'd like the FixtureStats class to have a 'position' property which corrosponds to it's parent's element name (so the FixtureStat object corrosponding to home_player_1 would have position=1). Can this be done with the built-in serialization atrributes? If it's not possible, what's the cleanest workaround? Bear in mind that each document will have about 50 player elements, each with about 50 'child' data elements.

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• GAE modeling relationship options

  - by Sway

  Hi there, I need to model the following situation and I can't seem to find a consistent example on how to do it "correctly" for the google app engine. Suppose I've got a simple situation like the following: [Company] 1 ----- M [Stare] A company has one to many stores. Each store has an address made up of a address line 1, city, state, country, postcode etc. Ok. Lets say we need to create say an "Audit". An Audit is for a company and can be across one to many stares. So something like: [Audit] 1 ------ 1 [Company] 1 ------ M [Store] Now we need to query all of the "audits" based on the Store "addresses" in order to send the "Auditors" to the right locations. There seem to be numerous articles like this one: http://code.google.com/appengine/articles/modeling.html Which give examples of creating a "ContactCompany" model class. However they also say that you should use this kind of relationship only when you "really need to" and with "care" for performance. I've also read - frequently - that you should denormalize as much as possible thereby moving all of the "query-able" data into the Audit class. So what would you suggest as the best way to solve this? I've seen that there is an Expando class but I'm not sure if that is the "best" option for this. Any help or thoughts on this would be totally appreciated. Thanks in advance, Matt

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• JQuery-UI Drag, Drop and Re-Drag Clones on Re-Drag

  - by amarcy

  I am using the following code to extend the JQuery-UI demos included with the download. I am trying to set up a container that the user can drag items into and then move the items around within the container. I incorporated the answer from http://stackoverflow.com/questions/867469/jquery-draggable-clone which works with one problem. <script> $(document).ready(function() { $("#droppable").droppable({ accept: '.ui-widget-content', drop: function(event, ui) { if($(ui).parent(":not(:has(#id1))")){ $(this).append($(ui.helper).clone().attr("id", "id1")); } $("#id1").draggable({ containment: 'parent', }); } }); $(".ui-widget-content").draggable({helper: 'clone'}); }); </script> div class="demo"> <div id="draggable" class="ui-widget-content"> <p>Drag me around</p> </div> <div id="droppable" class="ui-widget-header"> <p>Drop here</p> </div> When an item is dropped onto the droppable container it can be dragged one time and when it is dropped after that drag it loses its dragging capability. How do I allow for the item to be dragged multiple times after it has been added to the droppable container?

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• Nhibernate/Hibernate, lookup tables and object design

  - by Simon G

  Hi, I've got two tables. Invoice with columns CustomerID, InvoiceDate, Value, InvoiceTypeID (CustomerID and InvoiceDate make up a composite key) and InvoiceType with InvoiceTypeID and InvoiceTypeName columns. I know I can create my objects like: public class Invoice { public virtual int CustomerID { get; set; } public virtual DateTime InvoiceDate { get; set; } public virtual decimal Value { get; set; } public virtual InvoiceType InvoiceType { get; set; } } public class InvoiceType { public virtual InvoiceTypeID { get; set; } public virtual InvoiceTypeName { get; set; } } So the generated sql would look something like: SELECT CustomerID, InvoiceDate, Value, InvoiceTypeID FROM Invoice WHERE CustomerID = x AND InvoiceDate = y SELECT InvoiceTypeID, InvoiceTypeName FROM InvoiceType WHERE InvoiceTypeID = z But rather that having two select queries executed to retrieve the data I would rather have one. I would also like to avoid using child object for simple lookup lists. So my object would look something like: public class Invoice { public virtual int CustomerID { get; set; } public virtual DateTime InvoiceDate { get; set; } public virtual decimal Value { get; set; } public virtual InvoiceTypeID { get; set; } public virtual InvoiceTypeName { get; set; } } And my sql would look something like: SELECT CustomerID, InvoiceDate, Value, InvoiceTypeID FROM Invoice INNER JOIN InvoiceType ON Invoice.InvoiceTypeID = InvoiceType.InvoiceTypeID WHERE CustomerID = x AND InvoiceDate = y My question is how do I create the mapping for this? I've tried using join but this tried to join using CustomerID and InvoiceDate, am I missing something obvious? Thanks

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• How to loop through a boost::mpl::list?

  - by Kyle

  This is as far as I've gotten, #include <boost/mpl/list.hpp> #include <algorithm> namespace mpl = boost::mpl; class RunAround {}; class HopUpAndDown {}; class Sleep {}; template<typename Instructions> int doThis(); template<> int doThis<RunAround>() { /* run run run.. */ return 3; } template<> int doThis<HopUpAndDown>() { /* hop hop hop.. */ return 2; } template<> int doThis<Sleep>() { /* zzz.. */ return -2; } int main() { typedef mpl::list<RunAround, HopUpAndDown, Sleep> acts; // std::for_each(mpl::begin<acts>::type, mpl::end<acts>::type, doThis<????>); return 0; }; How do I complete this? (I don't know if I should be using std::for_each, just a guess based on another answer here)

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• Prevent Ninject from calling Initialize multiple times when binding to several interfaces

  - by Ahe

  Hi We have a concrete singleton service which implements Ninject.IInitializable and 2 interfaces. Problem is that services Initialize-methdod is called 2 times, when only one is desired. We are using .NET 3.5 and Ninject 2.0.0.0. Is there a pattern in Ninject prevent this from happening. Neither of the interfaces implement Ninject.IInitializable. the service class is: public class ConcreteService : IService1, IService2, Ninject.IInitializable { public void Initialize() { // This is called twice! } } And module looks like this: public class ServiceModule : NinjectModule { public override void Load() { this.Singleton<Iservice1, Iservice2, ConcreteService>(); } } where Singleton is an extension method defined like this: public static void Singleton<K, T>(this NinjectModule module) where T : K { module.Bind<K>().To<T>().InSingletonScope(); } public static void Singleton<K, L, T>(this NinjectModule module) where T : K, L { Singleton<K, T>(module); module.Bind<L>().ToMethod(n => n.Kernel.Get<T>()); } Of course we could add bool initialized-member to ConcreteService and initialize only when it is false, but it seems quite a bit of a hack. And it would require repeating the same logic in every service that implements two or more interfaces. Thanks for all the answers! I learned something from all of them! (I am having a hard time to decide which one mark correct). We ended up creating IActivable interface and extending ninject kernel (it also removed nicely code level dependencies to ninject, allthough attributes still remain).

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• Speed of CSS

  - by Ólafur Waage

  This is just a question to help me understand CSS rendering better. Lets say we have a million lines of this. <div class="first"> <div class="second"> <span class="third">Hello World</span> </div> </div> Which would be the fastest way to change the font of Hello World to red? .third { color: red; } div.third { color: red; } div.second div.third { color: red; } div.first div.second div.third { color: red; } Also, what if there was at tag in the middle that had a unique id of "foo". Which one of the CSS methods above would be the fastest. I know why these methods are used etc, im just trying to grasp better the rendering technique of the browsers and i have no idea how to make a test that times it. UPDATE: Nice answer Gumbo. From the looks of it then it would be quicker in a regular site to do the full definition of a tag. Since it finds the parents and narrows the search for every parent found. That could be bad in the sense you'd have a pretty large CSS file though.

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• [ActionScript 3] Array subclasses cannot be deserialized, Error #1034

  - by aaaidan

  I've just found a strange error when deserializing from a ByteArray, where Vectors cannot contain types that extend Array: there is a TypeError when they are deserialized. TypeError: Error #1034: Type Coercion failed: cannot convert []@4b8c42e1 to com.myapp.ArraySubclass. at flash.utils::ByteArray/readObject() at com.myapp::MyApplication()[/Users/aaaidan/MyApp/com/myapp/MyApplication.as:99] Here's how: public class Application extends Sprite { public function Application() { // register the custom class registerClassAlias("MyArraySubclass", MyArraySubclass); // write a vector containing an array subclass to a byte array var vec:Vector.<MyArraySubclass> = new Vector.<MyArraySubclass>(); var arraySubclass:MyArraySubclass = new MyArraySubclass(); arraySubclass.customProperty = "foo"; vec.push(arraySubclass); var ba:ByteArray = new ByteArray(); ba.writeObject(arraySubclass); ba.position = 0; // read it back var arraySubclass2:MyArraySubclass = ba.readObject() as MyArraySubclass; // throws TypeError } } public class MyArraySubclass extends Array { public var customProperty:String = "default"; } It's a pretty specific case, but it seems very odd to me. Anyone have any ideas what's causing it, or how it could be fixed?

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• Suggest joomla html editor extension/software

  - by DMin

  I've started using Joomla 1.5 recently and am using the TinyMCE online WYSIWYG editor that comes with the package to edit articles. I tend to write direct html and javascript rather than use the WYSIWYG functions, I find that after the first time the changes are applied(page updated) most of your html becomes 4-5 separate big paragraphs. Its very hard to find stuff in there cause the content has no formatting -- eg: <p><span id="psy_ass_span" class="pink_heading">Psychometric Assessment</span></p> <div id="psy_ass_div" class="pink_box"><img class="img_right" src="templates/teamwork.jpg" border="0" /> <p><strong>Emporkommen</strong> uses <strong>Psychometric assessment</strong> as a tool in order to gain insight into a person’s personality and psychological thinking. It can help develop team spirit in t <script src="plugins/editors/tinymce/jscripts/tiny_mce/themes/advanced/langs/en.js" type="text/javascript"></script> he workplace and assess an individual’s priorities.</p> Plus obviously there is no code highlighting in the editor so you can't figure out what is what. My question is, do you guys know of good(preferably non-commercial) extensions or other softwares or techniques that can make editing html code in Joomla 1.5 articles easier even after applying changes several times.

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• My PreferenceActivity does not show up, even though it is in my manifest file

  - by Charlie

  So I am modifying the Cube live wallpaper example. I have a class that extends PreferenceActivity, and I added the Activity in my manifest file. I keep getting ActivityNotFoundExceptions. Here is my preference class : public class MySettingsActivity extends PreferenceActivity implements SharedPreferences.OnSharedPreferenceChangeListener { @Override protected void onCreate(Bundle bundle) { super.onCreate(bundle); getPreferenceManager().setSharedPreferencesName( ParticleCandy.SHARED_PREFS_NAME); addPreferencesFromResource(R.xml.settings); getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener( this); } @Override protected void onResume() { super.onResume(); } @Override protected void onDestroy() { getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener( this); super.onDestroy(); } public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { } } And here is my manifest file <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.pixel.theory.wallpapers.mywallpaper" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <service android:label="@string/app_name" android:name="MyWallpaper" android:permission="android.permission.BIND_WALLPAPER" > <intent-filter> <action android:name="android.service.wallpaper.WallpaperService"> </action> </application> <uses-sdk android:minSdkVersion="7" /> <uses-feature android:name="android.software.live_wallpaper" /> </manifest> Any ideas why my preferences activity doesn't get read in from the manifest?

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• Nhibernate , collections and compositeid

  - by Ciaran

  Hi, banging my head here and thought that some one out there might be able to help. Have Tables below. Bucket( bucketId smallint (PK) name varchar(50) ) BucketUser( UserId varchar(10) (PK) bucketId smallint (PK) ) The composite key is not the problem thats ok I know how to get around this but I want my bucket class to contanin a IList of BucketUser. I read the online reference and thought that I had cracked it but havent. The two mappings are below -- bucket -- <id name="BucketId" column="BucketId" type="Int16" unsaved-value="0"> <generator class="native"/> </id> <property column="BucketName" type="String" name="BucketName"/> <bag name="Users" table="BucketUser" inverse="true" generic="true" lazy="true"> <key> <column name="BucketId" sql-type="smallint"/> <column name="UserId" sql-type="varchar"/> </key> <one-to-many class="Bucket,Impact.Dice.Core" not-found="ignore"/> </bag> -- bucketUser --

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