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• How to write Composition and Aggregation in java

  - by Mifas

  I want to know how to identify composition and aggregation code in java. I have C++ Code, But I don't understand how to write in java. Composition class A {}; class B { A composited_A; }; Aggregation via Pointer class A {}; class B { A* pointer_to_A; B(A anA){ pointer_to_A = &anA; } Can anyone please tell me how both are working in JAVA. (I know what is meant by Composition and aggregation ) };

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• hand coding a parser

  - by John Leidegren

  For all you compiler gurus, I wanna write a recursive descent parser and I wanna do it with just code. No generating lexers and parsers from some other grammar and don't tell me to read the dragon book, i'll come around to that eventually. I wanna get into the gritty details about implementing a lexer and parser for a reasonable simple langauge, say CSS. And I wanna do this right. This will probably end up being a series of questions but right now I'm starting with a lexer. Tokenization rules for CSS can be found here. I find my self writing code like this (hopefully you can infer the rest from this snippet): public CssToken ReadNext() { int val; while ((val = _reader.Read()) != -1) { var c = (char)val; switch (_stack.Top) { case ParserState.Init: if (c == ' ') { continue; // ignore } else if (c == '.') { _stack.Transition(ParserState.SubIdent, ParserState.Init); } break; case ParserState.SubIdent: if (c == '-') { _token.Append(c); } _stack.Transition(ParserState.SubNMBegin); break; What is this called? and how far off am I from something reasonable well understood? I'm trying to balence something which is fair in terms of efficiency and easy to work with, using a stack to implement some kind of state machine is working quite well, but I'm unsure how to continue like this. What I have is an input stream, from which I can read 1 character at a time. I don't do any look a head right now, I just read the character then depending on the current state try to do something with that. I'd really like to get into the mind set of writing reusable snippets of code. This Transition method is currently means to do that, it will pop the current state of the stack and then push the arguments in reverse order. That way, when I write Transition(ParserState.SubIdent, ParserState.Init) it will "call" a sub routine SubIdent which will, when complete, return to the Init state. The parser will be implemented in much the same way, currently, having everyhing in a single big method like this allows me to easily return a token when I found one, but it also forces me to keep everything in one single big method. Is there a nice way to split these tokenization rules into seperate methods? Any input/advice on the matter would be greatly appriciated!

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• How to merge an improperly created "branch" that isn't really a branch (wasn't created by an svn cop

  - by MatrixFrog

  I'm working on a team with lots of people who are pretty unfamiliar with the concepts of version control systems, and are just kind of doing whatever seems to work, by trial and error. Someone created a "branch" from the trunk that is not ancestrally related to the trunk. My guess is it went something like this: They created a folder in branches. They checked out all the code from the trunk to somewhere on their desktop. They added all that code to the newly created folder as though it was a bunch of brand new files. So the repository isn't aware that all that code is actually just a copy of the trunk. When I look at the history of that branch in TortoiseSVN, and uncheck the "Stop on copy/rename" box, there is no revision that has the trunk (or any other path) under the "Copy from path" column. Then they made lots of changes on their "branch". Meanwhile, others were making lots of changes on the trunk. We tried to do a merge and of course it doesn't work. Because, the trunk and the fake branch are not ancestrally related. I can see only two ways to resolve this: Go through the logs on the "branch", look at every change that was made, and manually apply each change to the trunk. Go through the logs on the trunk, look at every change that was made between revision 540 (when the "branch" was created) and HEAD, and manually apply each change to the "branch". This involves 7 revisions one way or 11 revisions the other way, so neither one is really that terrible. But is there any way to cause the repository to "realize" that the branch really IS ancestrally related even though it was created incorrectly, so that we can take advantage of the built-in merging functionality in Eclipse/TortoiseSVN? (You may be wondering: Why did your company hire these people and allow them to access the SVN repository without making sure they knew how to use it properly first?! We didn't -- this is a school assignment, which is a collaboration between two different classes -- the ones in the lower class were given a very quick hand-wavey "overview" of SVN which didn't really teach them anything. I've asked everyone in the group to please PLEASE read the svn book, and I'll make sure we (the slightly more experienced half of the team) keep a close eye on the repository to ensure this doesn't happen again.)

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• Using Java Reflections to retrieve member classes

  - by darkie15

  Hi All, I am using .getDeclaredClasses() method to retrieve all the classes that have been defined in object. However, I am not able to retrieve anonymous classes defined in the class. Here is the code sample that I am testing: public class TempCodes { public static void main(String[] args) { Ball b = new Ball() { public void hit() { System.out.println("You hit it!"); } }; b.hit(); } interface Ball { void hit(); } } and this is what my code does: memClass = className.getDeclaredClasses(); if (memClass .length > 0) { for (int index = 0 ; index < memClass .length ; index++) { System.out.println("\t\t\t" + memClass [index]); } } Can anyone help me understand how to retrieve the anonymous class? Regards, darkie

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• Batch scripting for directories or better method

  - by baron

  Hi Everyone, Looking at creating a simple batch file for my app. My app needs some directories to be in place as it runs. The first method I thought was just make a batch script: @ECHO OFF IF NOT EXIST C:\App GOTO :CREATE ELSE GOTO :DONTCREATE :CREATE MKDIR C:\App\Code ECHO DIRECTORY CREATED :DONTCREATE ECHO IT WAS ALREADY THERE 1) This doesn't run as I would expect. Both :CREATE and :DONTCREATE seem to run regardless? How do I do an If properly then? Output: A subdirectory or file C:\App\Code already exists. DIRECTORY CREATED IT WAS ALREADY THERE So it enters both true and false statements? 2) The app is a C# WPF app. For what I am trying to do here (create a couple of directories if they don't already exist) - should I do it some other way? Perhaps in the application as it runs?

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• Is there a logging facade for the .NET world?

  - by Elijah

  I'm somewhat new to the .NET stack and I was wondering if there is an equivalent to slf4j for the .NET platform. For me, logging to a Facade and being able to swap out logging implementations as needed just makes sense. Furthermore, the wrapper APIs available in slf4j have saved me many times when I needed to use a third-party library that was coded against a single logging framework that I wasn't using. Is there a project out there that acts as a facade between loggers like log4net, nLog and Enterprise Library? Are there wrappers that allow me to shortcut calls to those libraries and direct them to another library? Should I start out an open source project to do this myself? Is this question a duplicate because I don't know the right way to ask? Conversely, is the common way to do this using aspect orient programming?

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• The Benefits of Constants

  - by onaclov2000

  I understand one of the big deals about constants is that you don't have to go through and update code where that constant is used all over the place. Thats great, but let's say you don't explicitly declare it as a constant. What benefit(s) exist(s) to take a variable that HAPPENS to actually not be changed and make it a constant, will this save on processing, and/or size of code...etc? Basically I have a program that the compiler is saying that a particular variable is not changed and thus can be declared a constant, I just wanted to know what the benefit to adding the constant qualifier to it would be, if it makes no difference then making that change adds no value and thus no point wasting time (this same scenario occurs in more then one place) going back and "fixing" all these variables. Thank you, onaclov

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• Remove files from Bazaar

  - by Kristopher Ives

  I'm using Bazaar (bzr) to keep source code for a website updated, but we've ran into a problem when we remove files from version control. The files we are removing are ones we never intended to version to begin with. When this happens we use bzr rm --keep to remove the file from version control, but keep the file in the file system. Doing a bzr push or bzr pull results in the removed file(s) being removed on the other branches (other sites that use our code) We need a way to make sure that a bzr push or bzr pull doesn't actually remove those from the working copy. Anyone have any ideas?

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• Tiles and Map Points Clustering

  - by Franek

  Are there any examples with code that illustrate clustering of map points using tiles?

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• Load properties file in JAR?

  - by apryor48

  I'm having trouble when one of the jars that my web app depends on tries to load a properties file from within the jar. Here is the code in the jar. static { Properties props = new Properties(); try { props.load(ClassLoader.getSystemResourceAsStream("someProps.properties")); } catch (IOException e) { e.printStackTrace(); } someProperty = props.getProperty("someKey"); } The properties file is in my "src/main/resources" directory of the Maven project. When I run this code from my junit test in Eclipse, it executes just fine. When the project is built with Maven into a jar, and included as a dependency in my webb app, it fails to locate the properties file. I know that the properties file is at the base directory of the depended on jar, I don't know how to fix this. Please help!

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• Does there exist a version control gui that is compatible with most version control systems (git, sv

  - by Alex Stubbins

  I Just think that I could actually contribute code much faster if I didn't have to earn what is an almost entirely other subject.

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• Building dictionary of words from large text

  - by LiorH

  I have a text file containing posts in English/Italian. I would like to read the posts into a data matrix so that each row represents a post and each column a word. The cells in the matrix are the counts of how many times each word appears in the post. The dictionary should consist of all the words in the whole file or a non exhaustive English/Italian dictionary. I know this is a common essential preprocessing step for NLP. Does anyone know of a tool\project that can perform this task? Someone mentioned apache lucene, do you know if lucene index can be serialized to a data-structure similar to my needs?

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• How to keep an old VB6 application running in Windows Vista and Windows 7?

  - by MusiGenesis

  I have an old VB6 app which I'm still trying to support. A few users have reported weird crashes when running the app in Vista or Windows 7. The log files don't show anything after one of these crashes, but the customers report that the error message said "OLE something ...", if they saw anything at all. I've never been able to reproduce these crashes while running the program on my own Vista or Windows 7 boxes, so I have essentially no information on what the problem is. My suspicion is that it's a problem with their versions of one or more of the umpteen billion DLLs that a VB6 application is dependent on. The app also uses lame_enc.dll, which introduces a few more dependencies. I'm guessing this is a common problem with VB6 apps (although it's possible that I just sucked as a programmer 10 years ago). Is there some magical installer/updater out there that makes sure all the VB6 dependencies are what they need to be for a VB6 app to function properly?

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• VCL/Delphi/BCB - which IDE/language should I use?

  - by mawg

  I bought Delphi 1 when it came out - and was hooked. When BCB came out (around D3, iirc), I switched, mainly because I have used C/C++ professionally for a few decades. I have "been away" for 7 or 8 years and am now returning. I still have BCB 6 & Delphi 7 (not to mention Kylix). I always felt more comfortable with C++ than Pascal - purely because of work-day familiarity. But, realistically, iirc, most 3rd party VCL components are coded in Delphi/Pascal. And I think I used to have problems debugging Delphi components from BCB, but I could well remember wrongly. Anyhoo, now I am back and intend to use VCL components / hack the code of same / debug them & code a few of my own. Given that I am slightly more comfortable with C++, is there any compelling reason to choose Delphi over BCB, or is this just a case of how long my particular piece of string is?

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• Builder pattern and singletons

  - by Berryl

  Does anyone have any links to some code they like that shows a good example of this in c#? As an example of bad code, here is what a builder I have now looks like. I'm trying to have a way to keep the flexibility of the builder pattern but not rebuild the properties. Cheers, Berryl public abstract class ActivityBuilder { public abstract ActivityBuilder Build(); public bool IsBuilt { get; protected set; } public IEnumerable<Project> Projects { get { if(_projects==null) { Build(); } return _projects; } } protected IEnumerable<Project> _projects; // .. other properties }

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• Suggestions for debugging print stylesheets?

  - by Jim Puls

  I've recently been working on a print stylesheet for a website, and I realized that I was at a loss for effective ways to tweak it. It's one thing to have a reload cycle for working on the on-screen layout: change code command-tab reload but that whole process gets much more arduous when you're trying to print: change code command-tab reload print squint at print-preview image open PDF in Preview for further inspection Are there tools I'm missing out on here? Does WebKit's inspector have a "pretend this is paged media" checkbox? Is there some magic that Firebug (shudder) can do?

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• jQuery append Google Adsense to div..

  - by SoulieBaby

  Hi everyone, I'm having issues with google adsense and it loading before my jQuery and killing my codes, so I thought I'd try to append the Google Adsense javascript to the appropriate div using the document ready function, here's the code I'm trying to write: <script language="javascript" type="text/javascript"> $(document).ready(function(){ $(".googleBanners").html("<script language='javascript' type='text/javascript'>\n" + "google_ad_client = 'pub-8487967187298044';\n" + "google_ad_slot = '1088799521';\n" + "google_ad_width = 250;\n" + "google_ad_height = 250;\n" + "</" + "script>\n" + "<script language='javascript' src='http://pagead2.googlesyndication.com/pagead/show_ads.js' type='text/javascript'>" + "</" + "script>"); }); </script> But I'm not so good writing javascript/jQuery so if someone could help me implement this that would be fantastic. The error in FF I'm currently getting is "Error: google_protectAndRun is not defined". I'm not sure what that means, but I'm guessing I've written the jQuery code wrong.. lol

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• To find first N prime numbers in python

  - by Rahul Tripathi

  Hi All, I am new to the programming world. I was just writing this code in python to generate N prime numbers. User should input the value for N which is the total number of prime numbers to print out. I have written this code but it doesn't throw the desired output. Instead it prints the prime numbers till the Nth number. For eg.: User enters the value of N = 7. Desired output: 2, 3, 5, 7, 11, 13, 19 Actual output: 2, 3, 5, 7 Kindly advise. i=1 x = int(input("Enter the number:")) for k in range (1, (x+1), 1): c=0 for j in range (1, (i+1), 1): a = i%j if (a==0): c = c+1 if (c==2): print (i) else: k = k-1 i=i+1

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• How would you audit ASP.NET Membership tables, while recording what user made the changes?

  - by Pete

  Using a trigger-based approach to audit logging, I am recording the history of changes made to tables in the database. The approach I'm using (with a static sql server login) to record which user made the change involves running a stored procedure at the outset of each database connection. The triggers use this username when recording the audit rows. (The triggers are provided by the product OmniAudit.) However, the ASP.NET Membership tables are accessed primarily through the Membership API. I need to pass in the current user's identity when the Membership API opens its database connection. I tried subclassing MembershipProvider but I cannot access the underlying database connection. It seems like this would be a common problem. Does anyone know of any hooks we can access when the ASP.NET Membership makes its database connection?

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• Not all parameters get sent in jquery ajax call

  - by rksprst

  I have a strange error where my jquery ajax request doesn't submit all the parameters. $.ajax({ url: "/ajax/doAssignTask", type: 'GET', contentType: "application/json", data: { "just_a_task": just_a_task, "fb_post_date": fb_post_date, "task_fb_postId": task_fb_postId, "sedia_task_guid": sedia_task_guid, "itemGuid": itemGuid, "itemType": itemType, "taskName": taskName, "assignedToUserGuid": assignedToUserGuid, "taskDescription": taskDescription }, success: function(data, status) { //success code }, error: function(xhr, desc, err) { //error code } }); But using firebug (and debugging) I can see that only these variables are posted: assignedToUserGuid itemGuid itemType just_a_task taskDescription taskName It's missing fb_post_date, task_fb_postId, and sedia_task_guid I have no idea what would cause it to post only some items and not others? Anyone know? Data is sent to asp.net controller that returns jsonresult (hence the contentType) Any help is appreciated. Thanks!

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• C# ASP.Net The type or namespace name 'Secure' does not exist in the namespace 'source_extranet'

  - by Louis Russell

  Afternoon all, I really need your help as this is a Nightmare! I was earlier having a problem with referencing a 3rd Party Dll (Here) but have overcome this problem and am now having a problem referencing my own classes! Everything seems fine at build with no errors at all but when I go to run the application it comes up with the following Compilation Error: Compiler Error Message: CS0234: The type or namespace name 'Secure' does not exist in the namespace 'source_extranet' (are you missing an assembly reference?) The line that the Error points to this line in the class: source_extranet.Secure.BackendCustomData newdata = new source_extranet.Secure.BackendCustomData(); This line of code points to a class in the same folder as the calling code class. I have scoured Google looking for an answer and haven't found anything that points me to an answer to my problem. Any help would be AMAZING!

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• Perl equivalent to Java's "throws" clause

  - by Konerak

  Is there a way in Perl to declare that a method can throw an error (or die)? EDIT: What interests me the most is a way to get the compiler or IDE to tell me I have an unchecked exception somewhere in my code. I always loved how in Java, a method could handle an Exception and/or throw it. The method signature allows to put "throws MyException", so a good IDE/compiler would know that if you use said method somewhere in your code, you'd have to check for the Exception or declare your function to "throws" the Exception further. I'm unable to find something alike in Perl. A collegue of mine wrote a method which "dies" on incorrect input, but I forget to eval-if($@) it... offcourse the error was only discovered while a user was running the application. (offcourse I doubt if there is any existing IDE that could find these kind of things for Perl, but atleast perl -cw should be able to, no?)

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• How to fetch message body and attachments in XML format from Lotus Domino server from linux using ph

  - by too

  Has anybody some information about accessing Lotus Domino server to fetch entire mail contents by http(s) requests from php linux server? The article by Andrei Kouvchinnikov describes well how to fetch message list in notes mail folders; after obtaining session id during login one can for example select top 100 messages by calling: https://your.server.domain/mail_db/mailbox.nsf/($Inbox)?ReadViewEntries&Start=1&Count=100 And this works perfectly. The arises when I am trying to get message contents (0A1DA5EEB7B65277C12576F50055D811 is an example message unique Id): https://your.server.domain/mail_db/mailbox.nsf/($Inbox)/0A1DA5EEB7B65277C12576F50055D811/?OpenDocument Such request in IE shows frameset with data hard to parse, in less common browsers like Opera it informs about unsupported browser. Ideally if it is possible to fetch notes message contents and all attachments by requesting it in the url, has anybody some information what request would it be? Link to Lotus web calls reference would be even more beneficial.

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• Which layer should create DataContext?

  - by Kevin

  I have a problem to decide which layer in my system should create DataContext. I have read a book, saying that if do not pass the same DataContext object for all the database updates, it will sometimes get an exception thrown from the DataContext. That's why i initially create new instance of DataContext in business layer, and pass it into data access layer. So that the same datacontext is used for all the updates. But this lead to one design problem, if i wanna change my DAL to Non-LinqToSQL in future, i need to re-write the code in business layer as well. Please give me some advice on this. Thanks. Example code 'Business Layer Public Sub SaveData(name As String) Using ts AS New TransactionScope() Using db As New MyDataContext() DAL.Insert(db,name) DAL.Insert(db,name) End Using ts.Complete() End Using End Sub 'Data Access Layer Public Sub Insert(db as MyDataContext,name As string) db.TableAInsert(name) End Sub

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• get current selected button cell placed inside tableview using cocoa

  - by Swati

  hi i have a NSTableView i have two columns A and B B contains some data A contains custom button the button is added to column A using this: Below code is placed inside awakeFromNib method NSButtonCell *buttonCell = [[[NSButtonCell alloc] init] autorelease]; [buttonCell setBordered:NO]; [buttonCell setImagePosition:NSImageOnly]; [buttonCell setButtonType:NSMomentaryChangeButton]; [buttonCell setImage:[NSImage imageNamed:@"uncheck.png"]]; [buttonCell setSelectable:TRUE]; [buttonCell setTag:100]; [buttonCell setTarget:self]; [buttonCell setAction:@selector(selectButtonsForDeletion:)]; [[myTable tableColumnWithIdentifier:@"EditIdentifier"] setDataCell:buttonCell]; Some code in display cell of nstableview: -(void)tableView:(NSTableView *)tableView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)rowIndex { if(tableView == myTable) { if([[tableColumn identifier] isEqualToString:@"DataIdentifier"]) { } else if([[tableColumn identifier] isEqualToString:@"EditIdentifier"]) { NSButtonCell *zCell = (NSButtonCell *)cell; [zCell setTag:rowIndex]; [zCell setTitle:@"abc"]; [zCell setTarget:self]; [zCell setAction:@selector(selectButtonsForDeletion:)]; } } } now i want that when i click on the button the image of button cell gets changed as well as i want to do some coding. When button gets clicked then by default the tableView's reference gets passed. How can i get the button cell reference i looked here for similar problem: Cocoa: how to nest a button inside a Table View cell? but i am unable to add button inside column of NSTableView. How i change the image: - (void)tableView:(NSTableView *)tableView setObjectValue:(id)object forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row; { if(tableView == myTable) { if([[tableColumn identifier] isEqualToString:@"EditIdentifier"]) { NSButtonCell *aCell = (NSButtonCell *)[[tableView tableColumnWithIdentifier:@"EditIdentifier"] dataCellForRow:row]; NSInteger index = [[aCell title]intValue]; if([self.selectedIndexesArray count]>0) { if(![self.selectedIndexesArray containsObject:[NSNumber numberWithInt:index]]) { [aCell setImage:[NSImage imageNamed:@"check.png"]]; [self.selectedIndexesArray addObject:[NSNumber numberWithInt:index]]; } else { [aCell setImage:[NSImage imageNamed:@"uncheck.png"]]; [self.selectedIndexesArray removeObjectAtIndex:[selectedIndexesArray indexOfObject:[NSNumber numberWithInt:index]]]; } } else { [aCell setImage:[NSImage imageNamed:@"check.png"]]; [self.selectedIndexesArray addObject:[NSNumber numberWithInt:index]]; } } } } I have debugged the code and found that proper tag and titles are passed but image applies on more than one button cell, this is too very irregular. cant understand how its working!!! Any suggestions what am i doing wrong??

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