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• Help with Jquery + Masonry Plugin: How to expand/collapse boxes to reveal content

  - by Jam

  I'm using the masonry jquery plugin on a project: (http://desandro.com/resources/jquery-masonry) Basically I have a set of boxes (thumbnails) in a grid. When one is clicked, I want it to expand to a larger size to show more content (additional images and text). I'm struggling with how to make the thumbnail dissappear and then have new content appear in the expanded box. I don't know how to make the new content appear or where to store it on my page--and it needs to have a close button? The creator of the plugin gave me a quick tip for the expanding part, but the code I'm using has a set height and width and I want them to be variable depending on how much content is in the expanded state. Here's my jquery code so far: http://pastie.org/1002101 This is a similar example of the behaviour I want to achieve (except my boxes will have have varying expanded sizes): (http://www.learnsomethingeveryday.co.uk) You'll also notice from that example that it only allows 1 box to be expanded at a time--I would also like to have that functionality. Sorry for all the questions--I'm pretty new to jquery, any help would be amazing!

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• Maintaining state and data context between requests in ASP.NET + EF4

  - by Nick

  I have a EF4/ASP.NET web application that is structured to use POCOs and generic repositories, based essentially on this excellent article. The application is relatively sophisticated with one page that involves selection and linking of multiple entities to build up a complex user profile. This requires access to multiple entity types (20 or so) and associated repositories across multiple posts. When a repository is first accessed it uses the existing data context if exists, else it creates a new context. The problem is that if the lifetime of the context is only per-request (as suggested in the article) then you have to deal with multiple contexts and the complexity around detaching and attaching entities from contexts. My solution is to share the context between posts by creating a single View Model that includes all required repositories (initialised to share the same context) plus any associated data and store this model in a Session variable, retrieving from Session on subsequent page requests. Therefore maintaining the same context across all posts until the profile is saved. This works fine BUT I am concerned that I don't actually know exactly what is stored in the model session variable or more importantly the size of the Session variable. So two questions I suppose: firstly should I look for a better solution to handle the shared context across posts issue (any suggestions welcome)? And secondly what is actually stored in the Session when it includes a repository plus context? Any help appreciated!

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• MongoDB architectural question

  - by pex

  I have to store 4 Models. Let's say a Post that has many and belongs to many Categories. Category on the other hand has many Qualities. At the moment I'm of the opinion, that Post and Categories are Documents. Qualities becomes an EmbeddedDocument of Categories. We're coming to the root problem: There are a lot of Votes on Qualities that belong to a Post. I thought about embed Votes in Post and give it a quality_id. I am really expecting a lot of Votes and there has to be a possibility to filter them (e.g by Username / Usergroup / Date voted). I worked with MongoMapper and I think the missing existence of find methods for EmbeddedDocuments could become a killer. On the other hand I'm wondering about performance issues. What if I want to provide a Post without all the Votes, but only a few. Or, what if I define an own Document for Votes and have tons of Vote-Documents? Wouldn't that become a performance killer?

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• SQL GUID Vs Integer

  - by Dal

  Hi I have recently started a new job and noticed that all the SQL tables use the GUID data type for the primary key. In my previous job we used integers (Auto-Increment) for the primary key and it was a lot more easier to work with in my opinion. For example, say you had two related tables; Product and ProductType - I could easily cross check the 'ProductTypeID' column of both tables for a particular row to quickly map the data in my head because its easy to store the number (2,4,45 etc) as opposed to (E75B92A3-3299-4407-A913-C5CA196B3CAB). The extra frustration comes from me wanting to understand how the tables are related, sadly there is no Database diagram :( A lot of people say that GUID's are better because you can define the unique identifer in your C# code for example using NewID() without requiring SQL SERVER to do it - this also allows you to know provisionally what the ID will be.... but I've seen that it is possible to still retrieve the 'next auto-incremented integer' too. A DBA contractor reported that our queries could be up to 30% faster if we used the Integer type instead of GUIDS... Why does the GUID data type exist, what advantages does it really provide?... Even if its a choice by some professional there must be some good reasons as to why its implemented?

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• Is ther any tool to extract keywords from a English Text or Article In Java?

  - by user555581

  Dear Experts, I am trying to identify the type of the web site(In English) by machine. I try to download the homepage of the web iste, download html page, parsing and get the content of the web page. Such as here are some context from CNN.com. I try to get the keywords of the web page, mapping with my database. If the keywords include like news, breaking news. The web site will go to the news web sites. If there exist some words like healthy, medical, it will be the medical web site. There exist some tools can do the text segmentation, but it is not easy to find a tool do the semantic, such as online shopping, it is a keywords, should not spilt two words. The combination will be helpful information. But "oneline", "shopping" will be less useful as it may exist online travel... • Newark, JFK airports reopen • 1 runway reopens at LaGuardia Airport • Over 4,155 flights were cancelled Monday • FULL STORY * LaGuardia Airport snowplows busy Video * Are you stranded? | Airport delays * Safety tips for winter weather * Frosty fun Video | Small dog, deep snow Latest news * Easter eggs used to smuggle cocaine * Salmonella forces cilantro, parsley recall * Obama's surprising verdict on Vick * Blue Note baritone Bernie Wilson dead * Busch aide to 911: She's not waking up * Girl, 15, last seen working at store in '90 * Teena Marie's death shocks fans * Terror network 'dismantled' in Morocco * Saudis: 'Militant' had al Qaeda ties * Ticker: Gov. blasts Obama 'birthers' * Game show goof is 800K mistakeVideo * Chopper saves calf on frozen pondVideo * Pickpocketing becomes hands-freeVideo * Chilean miners going to Disney World * Who's the most intriguing of 2010? * Natalie Portman is pregnant, engaged * 'Convert all gifts from aunt' CNNMoney * Who controls the thermostat at home? * This Just In: CNN's news blog

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• Dojo Widgets not rendering when returned in response to XhrPost

  - by lazynerd

  I am trying to capture the selected item in a Dijit Tree widget to render remaining part of the web page. Here is the code that captures the selected item and sends it to Django backend: <div dojoType="dijit.Tree" id="leftTree" store="leftTreeStore" childrenAttr="folders" query="{type:'folder'}" label="Explorer"> <script type="dojo/method" event="onClick" args="item"> alert("Execute of node " + termStore.getLabel(item)); var xhrArgs = { url: "/load-the-center-part-of-page", handleAs: "text", postData: dojo.toJson(leftTreeStore.getLabel(item), true), load: function(data) { dojo.byId("centerPane").innerHTML = data; //window.location = data; }, error: function(error) { dojo.byId("centerPane").innerHTML = "<p>Error in loading...</p>"; } } dojo.byId("centerPane").innerHTML = "<p>Loading...</p>"; var deferred = dojo.xhrPost(xhrArgs); </script> </div> The remaining part of the page contains HTML code with dojo widgets. This is the code sent back as 'response' to the select item event. Here is a snippet: <div dojoType="dijit.layout.TabContainer" id="tabs" jsId="tabs"> <div dojoType="dijit.layout.BorderContainer" title="Dashboard"> <div dojoType="dijit.layout.ContentPane" region="bottom"> first tab </div> </div> <div dojoType="dijit.layout.BorderContainer" title="Compare"> <div dojoType="dijit.layout.ContentPane" region="bottom"> Second Tab </div> </div> </div> It renders this html 'response' but without the dojo widgets. Is handleAs: "text" in XhrPost the culprit here?

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• Synchronizing files between Linux servers, through FTP

  - by Daniel Magliola

  I have the following configuration of servers: 1 central linux server, a VPS 8 satellite linux servers, "crappy shared hostings" I have a bunch of files that I need to have in all servers. Right now i'm copying them everywhere manually, but I want to be able to copy them to the central server, and then have a scheduled process that runs every now and then and synchronizes them (only outwardly, no need to try to find "new" files in the satellite servers). There are a couple of catches though: I can't have any custom software in the satellite servers, or do strange command line things that'll auto connect to them and send the files directly. I know this is the way these kinds of things are normally done, but the satellite servers are crappy shared hosting ones where I have absolutely no control over anything. I need to send the files over FTP I also need to have, in my central server, a list of the files that are available in each of the satellite servers, to make sure they are ready before I send traffic to them. If I were to do this manually, the steps would be: get the list of files in a satellite server compare to my own, and send the files that are missing get the list of files again, and store it in my central database. I'd like to know what tools are out there that can alleviate as much of this as possible, first the syncing, and then the "getting the list of files available in the other server". I'm going to be doing everything from PHP, not sure if there are good tools to "use FTP from PHP", which i'm pretty sure i'll have to do for step 3 at least. Thanks in advance for any ideas! Daniel

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• Jquery get each div's sub child divs and grab info into an array

  - by McNabbToSkins

  I have a some html that looks like this <div id="main"> <div id="sub_main_1" class="sub_main"> <input type="text" class="sub_name_first" /><br /> <input type="text" class="sub_name_second" /><br /> </div> <div id="sub_main_2" class="sub_main"> <input type="text" class="sub_name_first" /><br /> <input type="text" class="sub_name_second" /><br /> </div> </div> I would like to pull out each sub_main divs information into an array in javascript. So far I have this as my jquery code $('#main').find('.sub_main').each( function() { alert('hi'); }); The alert is just a test that it should show "hi" twice. But this is not working. I am also not clear on how I can store the two inputs in a javascript array. Any help would be great! Thanks,

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• Calling MethodBase's Invoke on a constructor (reflection)

  - by Alix

  Hi everyone. First of all, sorry if this has been asked before. I've done a pretty comprehensive search and found nothing quite like it, but I may have missed something. And now to the question: I'm trying to invoke a constructor through reflection, with no luck. Basically, I have an object that I want to clone, so I look up the copy constructor for its type and then want to invoke it. Here's what I have: public Object clone(Object toClone) { MethodBase copyConstructor = type.GetConstructor( new Type[] { toClone.GetType() }); return method.Invoke(toClone, new object[] { toClone }); //<-- doesn't work } I call the above method like so: List list = new List(new int[] { 0, 1, 2 }); List clone = (List) clone(list); Now, notice the invoke method I'm using is MethodBase's invoke. ConstructorInfo provides an invoke method that does work if invoked like this: return ((ConstructorInfo) method).Invoke(new object[] { toClone }); However, I want to use MethodBase's method, because in reality instead of looking up the copy constructor every time I will store it in a dictionary, and the dictionary contains both methods and constructors, so it's a Dictionary<MethodBase>, not Dictionary<ConstructorInfo>. I could of course cast to ConstructorInfo as I do above, but I'd rather avoid the casting and use the MethodBase method directly. I just can't figure out the right parameters. Any help? Thanks so much.

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• Getting the first result from a LINQ query - why does ElementAt<T>(0) fails when First<T>() succeeds

  - by Mr Roys

  I have a method AddStudent() which looks for a student with the same name and returns an existing student from the database if there is a student with the same name, otherwise it creates a new student and adds it to the database. I'm curious why se = students.First<StudentEntity>(); succeeds when se = students.ElementAt<StudentEntity>(0); fails when I try to get the first result from the LINQ query. Aren't the two methods the same? The full code for the method is shown below. public Student AddStudent(string name) { using (SchoolEntities db = new SchoolEntities()) { // find student with same name via LINQ var students = from s in db.StudentEntitySet where s.name == name select s; StudentEntity se = default(StudentEntity); // if student with the same name is already present, return // that student if (students.Count<StudentEntity>() > 0) { // if i use ElementAt, if fails with a "LINQ to Entities does not // recognize the method 'StudentEntity ElementAt[StudentEntity] // (System.Linq.IQueryable`1[StudentEntity], Int32)' method, // and this method cannot be translated into a store expression.", // but not when I use First. Why? // se = students.ElementAt<StudentEntity>(0); se = students.First<StudentEntity>(); } else { // passing 0 for first parameter (id) since it's represented by // a BigInt IDENTITY field in the database so any value // doesn't matter. se = StudentEntity.CreateStudentEntity(0, name); db.AddToStudentEntitySet(se); db.SaveChanges(); } // create a Student object from the Entity object return new Student(se); } } Thanks!

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• Quickly determine if a number is prime in Python for numbers < 1 billion

  - by Frór

  Hi, My current algorithm to check the primality of numbers in python is way to slow for numbers between 10 million and 1 billion. I want it to be improved knowing that I will never get numbers bigger than 1 billion. The context is that I can't get an implementation that is quick enough for solving problem 60 of project Euler: I'm getting the answer to the problem in 75 seconds where I need it in 60 seconds. http://projecteuler.net/index.php?section=problems&id=60 I have very few memory at my disposal so I can't store all the prime numbers below 1 billion. I'm currently using the standard trial division tuned with 6k±1. Is there anything better than this? Do I already need to get the Rabin-Miller method for numbers that are this large. primes_under_100 = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97] def isprime(n): if n <= 100: return n in primes_under_100 if n % 2 == 0 or n % 3 == 0: return False for f in range(5, int(n ** .5), 6): if n % f == 0 or n % (f + 2) == 0: return False return True How can I improve this algorithm?

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• Overriding equals method without breaking symmetry in a class that has a primary key

  - by Kosta

  Hi, the answer to this question is probably "not possible", but let me ask regardless :) Assuming we have a very simple JAVA class that has a primary key, for example: class Person { String ssid; String name; String address; ... } Now, I want to store people in a collection, meaning I will have to override the equals method. Not a completely trivial matter, but on a bare basis I will have something along the lines of: @Override public boolean equals (Object other) { if(other==this) return true; if(!other.getClass().equals(this.getClass()) return false; Person otherPerson = (Person)other; if(this.ssid.equals(otherPerson.getSsid()) return true; } Excuse any obvious blunders, just typing this out of my head. Now, let's say later on in the application I have a ssid I obtained through user input. If I want to compare my ssid to a Person, I would have to call something like: String mySsid = getFromSomewhere(); Person myPerson = getFromSomewhere(); if(myPerson.equals(new Person(mySsid)) doSomething(); This means I have to create a convenience constructor to create a Person based on ssid (if I don't already have one), and it's also quite verbose. It would be much nicer to simply call myPerson.equals(mySsid) but if I added a string comparison to my Person equals class, that would break the symmetry property, since the String hasn't got a clue on how to compare itself to a Person. So finally, the big question, is there any way to enable this sort of "shorthand" comparisons using the overriden equals method, and without breaking the symmetry rule? Thanks for any thoughts on this!

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• remove specific values from multi value dictionary

  - by Anthony

  I've seen posts here on how to make a dictionary that has multiple values per key, like one of the solutions presented in this link: Multi Value Dictionary it seems that I have to use a List< as the value for the keys, so that a key can store multiple values. the solution in the link is fine if you want to add values. But my problem now is how to remove specific values from a single key. I have this code for adding values to a dictionary: private Dictionary<TKey, List<TValue>> mEventDict; // this is for initializing the dictionary public void Subscribe(eVtEvtId inEvent, VtEvtDelegate inCallbackMethod) { if (mEventDict.ContainsKey(inEvent)) { mEventDict[inEvent].Add(inCallbackMethod); } else { mEventDict.Add(inEvent, new List<TValue>() { v }); } } // this is for adding values to the dictionary. // if the "key" (inEvent) is not yet present in the dictionary, // the key will be added first before the value my problem now is removing a specific value from a key. I have this code: public void Unsubscribe(eVtEvtId inEvent, VtEvtDelegate inCallbackMethod) { try { mEventDict[inEvent].Remove(inCallbackMethod); } catch (ArgumentNullException) { MessageBox.Show("The event is not yet present in the dictionary"); } } basically, what I did is just replace the Add() with Remove() . Will this work? Also, if you have any problems or questions with the code (initialization, etc.), feel free to ask. Thanks for the advice.

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• Using libcurl & SSL

  - by Haraldo

  Hi there. I've found there is really very little information around on this topic. I already have a dll making successful posts using libcurl. I've compiled libcurl with openssl for ssl functionality. Here is an exert of my original curl setup. curl_easy_setopt(handle, CURLOPT_ERRORBUFFER, errorBuffer); //curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER , 1); //curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST , 1); //curl_easy_setopt(curl, CURLOPT_CAINFO , "./ca.cert"); curl_easy_setopt(handle, CURLOPT_POSTFIELDS, cParam); curl_easy_setopt(handle, CURLOPT_POSTFIELDSIZE, strlen(cParam)); curl_easy_setopt(handle, CURLOPT_FOLLOWLOCATION, 1); curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, Request::writer); curl_easy_setopt(handle, CURLOPT_WRITEDATA, &buffer); curl_easy_setopt(handle, CURLOPT_URL, cURL); My question to those who've done this before, is it as easy as just adding those lines above to get SSL to work (as long as the certificate exists)? Or is it more complicated? The funny thing is I'm not completely sure how SSL works. I've never worked with it before. Do I need to store a key in my application and send it with each request? Anyway my main question was the first. Thank you in advance.

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• What would be the time complexity of counting the number of all structurally different binary trees?

  - by ktslwy

  Using the method presented here: http://cslibrary.stanford.edu/110/BinaryTrees.html#java 12. countTrees() Solution (Java) /** For the key values 1...numKeys, how many structurally unique binary search trees are possible that store those keys? Strategy: consider that each value could be the root. Recursively find the size of the left and right subtrees. */ public static int countTrees(int numKeys) { if (numKeys <=1) { return(1); } else { // there will be one value at the root, with whatever remains // on the left and right each forming their own subtrees. // Iterate through all the values that could be the root... int sum = 0; int left, right, root; for (root=1; root<=numKeys; root++) { left = countTrees(root-1); right = countTrees(numKeys - root); // number of possible trees with this root == left*right sum += left*right; } return(sum); } } I have a sense that it might be n(n-1)(n-2)...1, i.e. n!

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• Dojox Datagrid contains data, but shows up as empty

  - by Vivek

  I'd really appreciate any help on this. There is this Dojox Datagrid that I'm creating programatically and supplying JSON data. As of now, I'm creating this data within JavaScript itself. Please refer to the below code sample. var upgradeStageStructure =[{ cells:[ { field: "stage", name: "Stage", width: "50%", styles: 'text-align: left;' }, { field:"status", name: "Status", width: "50%", styles: 'text-align: left;' } ] }]; var upgradeStageData = [ {id:1, stage: "Preparation", status: "Complete"}, {id:2, stage: "Formatting", status: "Complete"}, {id:3, stage: "OS Installation", status: "Complete"}, {id:4, stage: "OS Post-Installation", status: "In Progress"}, {id:5, stage: "Application Installation", status: "Not Started"}, {id:6, stage: "Application Post-Installation", status: "Not Started"} ]; var stagestore = new dojo.data.ItemFileReadStore({data:{identifier:"id", items: upgradeStageData}}); var upgradeStatusGrid = new dojox.grid.DataGrid({ autoHeight: true, style: "width:400px;padding:0em;margin:0em;", store: stagestore, clientSort: false, rowSelector: '20px', structure: upgradeStageStructure, columnReordering: false, selectable: false, singleClickEdit: false, selectionMode: 'none', loadingMessage: 'Loading Upgrade Stages', noDataMessage:'There is no data', errorMessage: 'Failed to load Upgrade Status' }); dojo.byId('progressIndicator').innerHTML=''; dojo.byId('progressIndicator').appendChild(upgradeStatusGrid.domNode); upgradeStatusGrid.startup(); The problem is that I am not seeing anything within the grid upon display (no headers, no data). But I know for sure that the data in the grid does exist and the grid is properly initialized, because I called alert (grid.domNode.innerHTML);. The resultant HTML that is thrown up does show a table containing header rows and the above data. This link contains an image which illustrates what I'm seeing when I display the page. (Can't post images since my account is new here) As you may notice, there are 6 rows for 6 pieces of data I have created but the grid is a mess. Please help out if you think you know what could be going wrong. Thanks in advance, Viv

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• Ideas for a rudimentary software licensing implementation

  - by Ross

  I'm trying to decide how to implement a very basic licensing solution for some software I wrote. The software will run on my (hypothetical) clients' machines, with the idea being that the software will immediately quit (with a friendly message) if the client is running it on greater-than-n machines (n being the number of licenses they have purchased). Additionally, the clients are non-tech-savvy to the point where "basic" is good enough. Here is my current design, but given that I have little to no experience in the topic, I wanted to ask SO before I started any development on it: A remote server hosts a MySQL database with a table containing two columns: client-key and license quantity The client-side application connects to the MySQL database on startup, offering it's client-key that I've put into a properties file packaged into the distribution (I would create a new distribution for each new client) Chances are, I'll need a second table to store validation history, so that with some short logic, the software can decide if it can be run on a given machine (maybe a sliding window of n machines using the software per 24 hours) If the software cannot establish a connection to the MySQL database, or decides that it's over the n allowed machines per day, it closes The connection info for the remote server hosting the MySQL database should be hard-coded into the app? (That sounds like a bad idea, but otherwise they could point it to some other always-validates-to-success server) I think that about covers my initial design. The intent being that while it certainly isn't full-proof, I think I've made it at least somewhat difficult to create an easily-sharable cracking solution. Also, I can easily adjust the license amount for a given client/key pair. I gotta figure this has been done a million times before, so tell me about a better solution that's just as simple to implement and provides the same (low) amount of security. In the event that external libraries are used, I prefer Java, as that's what the software has been written in.

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• SharePoint 2010 / ASP.Net Integration - Looking for advice

  - by jpennal

  I have been Googling a problem that I have with trying to integrate the web application that I am working on with SharePoint 2010. The web application is a wiki style tool that allows users to log in via forms authentication or WIA against Active Directory and create content for themselves and others. What we would like to do is to allow a user have a page with the content they have created in our web application mixed in with content that they have living on the SharePoint server. For example, they may want to see a list of documents that they have on the SharePoint server mixed in with some of their content. To accomplish this, we would like to take the credentials the user has logged into our web application with (for example MYDOMAIN\jsmith) and be able to query SharePoint for the documents of that same user (MYDOMAIN\jsmith) WITHOUT the user being prompted to re-enter their credentials to access the SharePoint server (we are trying to avoid the double-hop problem) We have come up with some options for how we want to do this, but we are unsure of what the best approach is. For example, we could - Have a global user, shared by all users to get information we need from SharePoint. The downside is that we cannot filter SharePoint content to a particular user - We could store the users credentials when they log in, but that would only work for users authenticating via forms auth and would be a security issue that some users/clients would not like - Writing a SharePoint extension using WCF to allow us to access the information we need, however we'd still have the issue of figuring out how to impersonate the user we want. Neither of these options are ideal and in our investigation we came across the Claims Authentication/STS option which seems like it is trying to solve the problem we are having. So my question is, based on what I have written, is Claims/STS the best approach for us? We have not been able to find much direction on how to use this method to call into SharePoint from a Web Application and pass along the existing credentials. Does anyone have any experience with any of these issues?

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• How to share data between SSRS Security and Data Processing extension?

  - by user2904681

  I've spent a lot of time trying to solve the issue pointed in title and have no found a solution yet. I use MS SSRS 2012 with custom Security (based on Form Authentication and ClaimsPrincipal) and Data Processing extensions. In Data extension level I need to apply filter programmatically based on one of the claim which I have access in Security extension level only. Here is the problem: I do know how to pass the claim from Security to Data Processing extension code... What I've tried: IAuthenticationExtension.LogonUser(string userName, string password, string authority) { ... ClaimsPrincipal claimsPrincipal = CreateClaimsPrincipal(...); Thread.CurrentPrincipal = claimsPrincipal; HttpContext.Current.User = claimsPrincipal; ... }; But it doesn't work. It seems SSRS overrides it within either GenericPrincipal or FormsIdentity internally. The possible workaround I'm thinking about (but haven't checked it yet): 1. Create HttpModule which will create HttpContext with all required information (minus: will be invoke getting claims each time - huge operation) 2. Write to custom SQL table to store logged users information which is required for Data extension and then read it 3. try somehow to append to cookies due to LogOn and then read each time on IAuthenticationExtension.GetUserInfo and fill HttpContext None of them seems to be a good solution. I would be grateful for any help/advise/comments.

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• Techniques for sharing a value among classes in a program

  - by Kenneth Cochran

  I'm using Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) + "\MyProgram" As the path to store several files used by my program. I'd like to avoid pasting the same snippet of code all over the my applcation. I need to ensure that: The path cannot be accidentally changed once its been set The classes that need it have access to it. I've considered: Making it a singleton Using constructor dependency injection Using property dependency injection Using AOP to create the path where its needed. Each has pros and cons. The singleton is everyone's favorite whipping boy. I'm not opposed to using one but there are valid reasons to avoid it if possible. I'm already heavily using constructor injection through Castle Windsor. But this is a path string and Windsor doesn't handle system type dependencies very gracefully. I could always wrap it in a class but that seems like overkill for something as simple as a passing around a string value. In any case this route would add yet another constructor argument to each class where it is used. The problem I see with property injection in this case is that there is a large amount of indirection from the where the value is set to where it is needed. I would need a very long line of middlemen to reach all the places where its used. AOP looks promising and I'm planning on using AOP for logging anyway so this at least sounds like a simple solution. Is there any other options I haven't considered? Am I off base with my evaluation of the options I have considered?

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• Managing/Storing complex application form

  - by mickyjtwin

  I am developing an online application form, which can be of two categories, either domestic/international. Each different type has commong questions, and also specific questions. They are approx 6 pages/steps of questions. The application form can also be saved at the end of each step, and can be completed at a later date. Some questions will vary depending on answers to previous questions, so there are some complex business rules. In terms of storage of results, would it be best to store the answers in and XML field in SQL? What would be the best way to reference a question to an answer. There is no need for the form to be dynamic in rendering questions etc. e.g. <Application id="123" type="Domestic"> <Answers> <EmailAddress>[email protected]</EmailAddress> <HomePhone>555-5555</HomePhone> <Suburb>MySuburb</Suburb> <Guardians> <Guardian type="Mother"> <FirstName>Mom</FirstName> </Guardian> </Guardians> <Answers> </Application>

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• What's the deal with Java's public fields?

  - by Annan

  I've been reading two articles (1)(2) on javaworld.com about how all class fields should be private and getter/setter methods are just as bad. An object should act on the data it has rather than allowing access to it. I'm currently working on a University assignment for Connect Four. In designing the program the Agents playing the Game need access to the Board's state (so they can decide what to move). They also need to pass this move to the Game so it can validate it as a legal move. And during deciding what to move pieces are grouped into Threats with a start and end Points. Board, Threat and Point objects don't really do anything. They are just there to store related data that can be accessed in a human readable way. At the start of design I was representing Points on the board as two element int arrays, however that got annoying when creating points or referencing components of them. So, the class: public class Point { public int x; public int y; public Point(int x, int y){ this.x = x; this.y = y; } } Perfect in every way I can think of. Except it breaks every rule I've learned. Have I sinned?

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• Is this a good KVO-compliant way to model a mutable to-many relationship?

  - by andyvn22

  Say I'd like a mutable, unordered to-many relationship. For internal optimization reasons, it'd be best to store this in an NSMutableDictionary rather than an NSMutableSet. But I'd like to keep that implementation detail private. I'd also like to provide some KVO-compliant accessors, so: - (NSSet*)things; - (NSUInteger)countOfThings; - (void)addThings:(NSSet*)someThings; - (void)removeThings:(NSSet*)someThings; Now, it'd be convenient and less evil to provide accessors (private ones, of course, in my implementation file) for the dictionary as well, so: @interface MYClassWithThings () @property (retain) NSMutableDictionary* keyedThings; @end This seems good to me! I can use accessors to mess with my keyedThings within the class, but other objects think they're dealing with a mutable, unordered (, unkeyed!) to-many relationship. I'm concerned that several things I'm doing may be "evil" though, according to good style and Apple approval and whatnot. Have I done anything evil here? (For example, is it wrong not to provide setThings, since the things property is supposedly mutable?)

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• Lucene and Special Characters

  - by Brandon

  I am using Lucene.Net 2.0 to index some fields from a database table. One of the fields is a 'Name' field which allows special characters. When I perform a search, it does not find my document that contains a term with special characters. I index my field as such: Directory DALDirectory = FSDirectory.GetDirectory(@"C:\Indexes\Name", false); Analyzer analyzer = new StandardAnalyzer(); IndexWriter indexWriter = new IndexWriter(DALDirectory, analyzer, true, IndexWriter.MaxFieldLength.UNLIMITED); Document doc = new Document(); doc.Add(new Field("Name", "Test (Test)", Field.Store.YES, Field.Index.TOKENIZED)); indexWriter.AddDocument(doc); indexWriter.Optimize(); indexWriter.Close(); And I search doing the following: value = value.Trim().ToLower(); value = QueryParser.Escape(value); Query searchQuery = new TermQuery(new Term(field, value)); Searcher searcher = new IndexSearcher(DALDirectory); TopDocCollector collector = new TopDocCollector(searcher.MaxDoc()); searcher.Search(searchQuery, collector); ScoreDoc[] hits = collector.TopDocs().scoreDocs; If I perform a search for field as 'Name' and value as 'Test', it finds the document. If I perform the same search as 'Name' and value as 'Test (Test)', then it does not find the document. Even more strange, if I remove the QueryParser.Escape line do a search for a GUID (which, of course, contains hyphens) it finds documents where the GUID value matches, but performing the same search with the value as 'Test (Test)' still yields no results. I am unsure what I am doing wrong. I am using the QueryParser.Escape method to escape the special characters and am storing the field and searching by the Lucene.Net's examples. Any thoughts?

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• Is it valid to use unsafe struct * as an opaque type instead of IntPtr in .NET Platform Invoke?

  - by David Jeske

  .NET Platform Invoke advocates declaring pointer types as IntPtr. For example, the following [DllImport("user32.dll")] static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, Int32 wParam, Int32 lParam); However, I find when interfacing with interesting native interfaces, that have many pointer types, flattening everything into IntPtr makes the code very hard to read and removes the typical typechecking that a compiler can do. I've been using a pattern where I declare an unsafe struct to be an opaque pointer type. I can store this pointer type in a managed object, and the compiler can typecheck it form me. For example: class Foo { unsafe struct FOO {}; // opaque type unsafe FOO *my_foo; class if { [DllImport("mydll")] extern static unsafe FOO* get_foo(); [DllImport("mydll")] extern static unsafe void do_something_foo(FOO *foo); } public unsafe Foo() { this.my_foo = if.get_foo(); } public unsafe do_something_foo() { if.do_something_foo(this.my_foo); } While this example may not seem different than using IntPtr, when there are several pointer types moving between managed and native code, using these opaque pointer types for typechecking is a godsend. I have not run into any trouble using this technique in practice. However, I also have not seen an examples of anyone using this technique, and I wonder why. Is there any reason that the above code is invalid in the eyes of the .NET runtime? My main question is about how the .NET GC system treats "unsafe FOO *my_foo". Is this pointer something the GC system is going to try to trace, or is it simply going to ignore it? My hope is that because the underlying type is a struct, and it's declared unsafe, that the GC would ignore it. However, I don't know for sure. Thoughts?

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