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  • Constructor versus setter injection

    - by Chris
    Hi, I'm currently designing an API where I wish to allow configuration via a variety of methods. One method is via an XML configuration schema and another method is through an API that I wish to play nicely with Spring. My XML schema parsing code was previously hidden and therefore the only concern was for it to work but now I wish to build a public API and I'm quite concerned about best-practice. It seems that many favor javabean type PoJo's with default zero parameter constructors and then setter injection. The problem I am trying to tackle is that some setter methods implementations are dependent on other setter methods being called before them in sequence. I could write anal setters that will tolerate themselves being called in many orders but that will not solve the problem of a user forgetting to set the appropriate setter and therefore the bean being in an incomplete state. The only solution I can think of is to forget about the objects being 'beans' and enforce the required parameters via constructor injection. An example of this is in the default setting of the id of a component based on the id of the parent components. My Interface public interface IMyIdentityInterface { public String getId(); /* A null value should create a unique meaningful default */ public void setId(String id); public IMyIdentityInterface getParent(); public void setParent(IMyIdentityInterface parent); } Base Implementation of interface: public abstract class MyIdentityBaseClass implements IMyIdentityInterface { private String _id; private IMyIdentityInterface _parent; public MyIdentityBaseClass () {} @Override public String getId() { return _id; } /** * If the id is null, then use the id of the parent component * appended with a lower-cased simple name of the current impl * class along with a counter suffix to enforce uniqueness */ @Override public void setId(String id) { if (id == null) { IMyIdentityInterface parent = getParent(); if (parent == null) { // this may be the top level component or it may be that // the user called setId() before setParent(..) } else { _id = Helpers.makeIdFromParent(parent,getClass()); } } else { _id = id; } } @Override public IMyIdentityInterface getParent() { return _parent; } @Override public void setParent(IMyIdentityInterface parent) { _parent = parent; } } Every component in the framework will have a parent except for the top level component. Using the setter type of injection, then the setters will have different behavior based on the order of the calling of the setters. In this case, would you agree, that a constructor taking a reference to the parent is better and dropping the parent setter method from the interface entirely? Is it considered bad practice if I wish to be able to configure these components using an IoC container? Chris

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  • Why does the BigFraction class in the Apache-Commons-Math library return incorrect division results?

    - by Timothy Lee Russell
    In the spirit of using existing, tested and stable libraries of code, I started using the Apache-Commons-Math library and its BigFraction class to perform some rational calculations for an Android app I'm writing called RationalCalc. It works great for every task that I have thrown at it, except for one nagging problem. When dividing certain BigFraction values, I am getting incorrect results. If I create a BigFraction with the inverse of the divisor and multiply instead, I get the same incorrect answer but perhaps that is what the library is doing internally anyway. Does anyone know what I am doing wrong? The division works correctly with a BigFraction of 2.5 but not 2.51, 2.49, etc... // *** incorrect! *** BigFraction one = new BigFraction(1.524); //one: 1715871458028159 / 1125899906842624 BigFraction two = new BigFraction(2.51); //two: 1413004383087493 / 562949953421312 BigFraction three = one.divide(two); //three: 0 Log.i("solve", three.toString()); //should be 0.607171315 ?? //returns 0 // *** correct! **** BigFraction four = new BigFraction(1.524); //four: 1715871458028159 / 1125899906842624 BigFraction five = new BigFraction(2.5); //five: 5 / 2 BigFraction six = four.divide(five); //six: 1715871458028159 / 2814749767106560 Log.i("solve", six.toString()); //should be 0.6096 ?? //returns 0.6096

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  • UIWebview contents as NSString from HTML

    - by Yoon Lee
    I'm trying to reading part of HTML source code from website that has been encapsulated by javascript;basically i'm trying to read email which appears in webview but not in real source code using NSString method of 'NSString stringWithContentsOfURL:(NSURL *)url'. it looks like code showing up before hitting up the inner java script (which executes and shows the email address to show). are there any way i can get into NSString the contents that I viewed over UIWebview? I tried to use the method 'webView stringByEvaluatingJavaScriptFromString' it worked for only displaying through webview browser didn't return any string value. Are there anyway I can get the string?

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  • Need unicode characters in UITableView from SQLlite database

    - by Lee Armstrong
    I have some NSString varibales that incude items like Ð and Õ and if I do cell.textLabel.text = person.name; and if it contains one of those characters the cell.textlabel is blank! I have discovered that if I use NSString *col1 = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)]; To pull my data back it pulls back null, however using the deprectared method NSString *col1 = [NSString stringWithCString:(char *)sqlite3_column_text(compiledStatement, 0)]; Shows the characters! Any ideas?

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  • DOS Batch file to echo a specific line number

    - by Lee
    So for the second part of my current dilemma, I have a list of folders in "c:\file_list.txt". I need to be able to extract them (well, echo them with some mods) based on the line number because this batch script is being called by an iterative macro process. I'm passing the line number as a parameter. @echo off setlocal enabledelayedexpansion set /a counter=0 set /a %%a = "" for /f "usebackq delims=" %%a in (c:\file_list.txt) do (if "!counter!"=="%1" goto :printme & set /a counter+=1) :printme echo %%a which gives me an output of "%a". Doh! So, I've tried echoing !a! (result: "ECHO is off."); I've tried echoing %a (result: a) I figured the easy thing to do would be to modify the "head.bat" code found here: http://stackoverflow.com/questions/130116/dos-batch-commands-to-read-first-line-from-text-file except rather than echoing every line - I'd just echo the last line found. Not as simple as one might think. I've noticed that my counter is staying at zero for some reason; I'm wondering if the "set /a counter+=1" is doing what I think it's doing.

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  • Does NSKeyedUnarchiver autorelease?

    - by Lee Probert
    I'm doing some archiving to a property list and when I unarchive my data using NSKeyedUnarchiver I find that my app crashes if I release the object afterward. I was wondering if the finishDecoding message also autoreleases the object. Seems weird that it crashes when I release it.

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  • How do I send text to a UITextView?

    - by Lee
    I'm new to iphone development. I'm a VB programmer who is trying to convert a VB application to an ipad app. I need some help with sending text to a UITextView. I want to first have a UIPickerView and then once the user hits a UIButton, a UITextView appears and the text is then generated by my source code code, line by line. The code would constantly be concatenating strings to the text. It would sort of go like this-- 1) User makes selections with UIPickerView. 2) User then hits UIButton. 3) UIPickerView is replaced on the screen with a UITextView. 4) The code does stuff. 5) The code adds the 1st line of text into the UITextView. 6) The code does more stuff. 7) The code then adds the 2nd line of text into the UITextView, retaining the 1st line that was already there. Steps 6 and 7 are repeated until the code is done. Does anyone know of any examples of this that I could look at? I am mostly interested in finding something like a youtube video, a webpage that explains the code or even a good book that covers this particular topic. I am finding that the sample codes that Apple has on this site goes over my head. In fact, I could probably benefit from a good book. But, I am looking for one that I would already know covers this particular topic, since it is so essential to the app that I am trying to build.

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  • How to mix Grammar (Rules) & Dictation (Free speech) with SpeechRecognizer in C#

    - by Lee Englestone
    I really like Microsofts latest speech recognition (and SpeechSynthesis) offerings. http://msdn.microsoft.com/en-us/library/ms554855.aspx http://estellasays.blogspot.com/2009/04/speech-recognition-in-cnet.html However I feel like I'm somewhat limited when using grammars. Don't get me wrong grammars are great for telling the speech recognition exactly what words / phrases to look out for, however what if I want it to recognise something i've not given it a heads up about? Or I want to parse a phrase which is half pre-determined command name and half random words? For example.. Scenario A - I say "Google [Oil Spill]" and I want it to open Google with search results for the term in brackets which could be anything. Scenario B - I say "Locate [Manchester]" and I want it to search for Manchester in Google Maps or anything else non pre-determined I want it to know that 'Google' and 'Locate' are commands and what comes after it are parameters (and could be anything). Question : Does anyone know how to mix the use of pre-determined grammars (words the speech recognition should recognise) and words not in its pre-determined grammar? Code fragments.. using System.Speech.Recognition; ... ... SpeechRecognizer rec = new SpeechRecognizer(); rec.SpeechRecognized += rec_SpeechRecognized; var c = new Choices(); c.Add("search"); var gb = new GrammarBuilder(c); var g = new Grammar(gb); rec.LoadGrammar(g); rec.Enabled = true; ... ... void rec_SpeechRecognized(object sender, SpeechRecognizedEventArgs e) { if (e.Result.Text == "search") { string query = "How can I get a word not defined in Grammar recognised and passed into here!"; launchGoogle(query); } } ... ... private void launchGoogle(string term) { Process.Start("IEXPLORE", "google.com?q=" + term); }

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  • Silverlight 3: ListBox DataTemplate HorizontalAlignment

    - by Lee
    I have a ListBox with it's ItemTemplate bound to a DataTemplate. My problem is I cannot get the elements in the template to stretch to the full width of the ListBox. <ListBox x:Name="listPeople" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Margin="0,0,0,0" Background="{x:Null}" SelectionMode="Extended" Grid.Row="1" ItemTemplate="{StaticResource PersonViewModel.BrowserDataTemplate}" ItemsSource="{Binding Mode=OneWay, Path=SearchResults}" > </ListBox> <DataTemplate x:Key="PersonViewModel.BrowserDataTemplate"> <ListBoxItem HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="5,5,5,5"> <Border Opacity=".1" x:Name="itemBorder" Background="#FF000000" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" CornerRadius="5,5,5,5" MinWidth="100" Height="50"/> </Grid> </ListBoxItem> </DataTemplate> As you can see, I have added a border within the grid to indicate the width of the template. My goal is to see this border expand to the full width of the listbox. Currently its width is determined by its contents or MinWidth, which is the only thing at the moment keeping it visible at all.

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  • Stream post URL security and wall post links

    - by Jeff Lee
    Our app's mobile client can create wall post links to our app's web-facing pages. Since this happens in the context of a mobile app, we do this on behalf of our user using the Graph API's feed/message endpoint. I noticed that the links showing up in the wall posts are being routed through our app's auth dialog, which is NOT what we want. We just want transparent links, without forcing the client to auth our app, similar to what happens when you share to FB in Path. I went ahead and disabled the "Stream post URL option" several hours ago, but we still seem to be getting the re-routed links for wall posts. The target URLs for these links are within the domain we've registered for our Facebook app. Is there anything else I need to do fix this?

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  • Windows batch file to list folders that have a specific file in them

    - by Lee
    I'm trying to create a file that has a list of directories that have a specific file name in them. Let's say I'm trying to find directories that have a file named *.joe in them. I initially tried just a simple dir /ad *.joe > dir_list.txt , but it searches the directory names for *.joe, so no go. Then I concluded that a for loop was probably my best bet. I started with for /d /r %a in ('dir *.joe /b') do @echo %a >> dir_list.txt and it looked like it wasn't executing the dir command. I added the "usebackq", but that seems to only work for the /F command extension. Ideas?

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  • How Can I Improve/SpeedUp This FrequentFunction in C?

    - by Peter Lee
    Hi folks, How can I improve / speed up this frequent function? #include <math.h> #include <stdio.h> #include <stdlib.h> #include <time.h> // Assumptions: x, y, z, a, b and c are all array of 10. // Requirement: return the value of ret; // get all elements of array c float fnFrequentFunction(const float* x, const float* y, const float* z, const float *a, const float *b, float *c, int M) { register float tmp; register float sum; register float ret = 0; int i; for (i = 0; i < M; i++) // M == 1, 2, 4, or 8 { sum = 0; tmp = x[0] - y[0]; sum += tmp * tmp * z[0]; tmp = x[1] - y[1]; sum += tmp * tmp * z[1]; tmp = x[2] - y[2]; sum += tmp * tmp * z[2]; tmp = x[3] - y[3]; sum += tmp * tmp * z[3]; tmp = x[4] - y[4]; sum += tmp * tmp * z[4]; tmp = x[5] - y[5]; sum += tmp * tmp * z[5]; tmp = x[6] - y[6]; sum += tmp * tmp * z[6]; tmp = x[7] - y[7]; sum += tmp * tmp * z[7]; tmp = x[8] - y[8]; sum += tmp * tmp * z[8]; tmp = x[9] - y[9]; sum += tmp * tmp * z[9]; ret += (c[i] = log(a[i] * b[i]) + sum); } return ret; } int main() { float x[10] = {0.001251f, 0.563585f, 0.193304f, 0.808741f, 0.585009f, 0.479873f, 0.350291f, 0.895962f, 0.622840f, 0.746605f}; float y[10] = {0.864406f, 0.709006f, 0.091433f, 0.995727f, 0.227180f, 0.902585f, 0.659047f, 0.865627f, 0.846767f, 0.514359f}; float z[10] = {0.866817f, 0.581347f, 0.175542f, 0.620197f, 0.781823f, 0.778588f, 0.938688f, 0.721610f, 0.940214f, 0.811353f}; float a[10] = {0.870205f, 0.733879f, 0.711386f, 0.588244f, 0.484176f, 0.852962f, 0.168126f, 0.684286f, 0.072573f, 0.632160f}; float b[10] = {0.871487f, 0.998108f, 0.798608f, 0.134831f, 0.576281f, 0.410779f, 0.402936f, 0.522935f, 0.623218f, 0.193030f}; float c[8]; int i; int n = 10000000; long start; // Speed test here: start = clock(); while(--n) fnFrequentFunction(x, y, z, a, b, c, 8); printf("Time used: %ld\n", clock() - start); printf("fnFrequentFunction == %f\n", fnFrequentFunction(x, y, z, a, b, c, 8)); for(i = 0; i < 8; ++i) printf(" c[%d] == %f\n", i, c[i]); printf("\n"); return 0; } Any suggestions are welcome :-)

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  • TG2.1: Proper location to store a database session instance?

    - by Lee Olayvar
    I am using a custom database (MongoDB) with TG 2.1 and i am wondering where the proper place to store the PyMongo connection/database instances would be? Eg, at the moment they are getting created inside of my inherited instance of AppConfig. Is there a standard location to store this? Would shoving the variables into the project.model.__init__ be the best location, given that under SQLAlchemy, the database seems to commonly be retrieved via: from project.model import DBSession, metadata Anyway, just curious what the best practice is.

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  • learn ia32 for C

    - by David Lee
    I am trying to translate the following: Action: pushl %ebp movl %esp, %eax subl $32, %esp movl $0, -8(%eax) movl $0, -4(%eax) movl -4(%eax), %eax cmpl 32(%eax), %ebp movl -4(%ebp), %eax sall $2, %ebp addl 8(%ebp), %ebp movl (%ebp), %ebp addl %ebp, -8(%eax) addl $1, -4(%eax) What is the best way to learn assembly and translating this code?

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  • Jasmine testing coffeescript expect(setTimeout).toHaveBeenCalledWith

    - by Lee Quarella
    In the process of learning Jasmine, I've come to this issue. I want a basic function to run, then set a timeout to call itself again... simple stuff. class @LoopObj constructor: -> loop: (interval) -> #do some stuff setTimeout((=>@loop(interval)), interval) But I want to test to make sure the setTimeout was called with the proper args describe "loop", -> xit "does nifty things", -> it "loops at a given interval", -> my_nifty_loop = new LoopObj interval = 10 spyOn(window, "setTimeout") my_nifty_loop.loop(interval) expect(setTimeout).toHaveBeenCalledWith((-> my_nifty_loop.loop(interval)), interval) I get this error: Expected spy setTimeout to have been called with [ Function, 10 ] but was called with [ [ Function, 10 ] ] Is this because the (-> my_nifty_loop.loop(interval)) function does not equal the (=>@loop(interval)) function? Or does it have something to do with the extra square brackets around the second [ [ Function, 10 ] ]? Something else altogther? Where have I gone wrong?

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  • Are There Any 3rd-Party Free Deployment Templates for Visual Studio Express Edition

    - by Peter Lee
    Hi, Due to the lack of Deployment functionality of Visual Studio Express edition, I'm here asking if anyone can recommend a very nice free Deployment template for the express edition. I'm mainly working with C# desktop project. I know that there is still ClickOnce deployment in the Express edition, but it seems to me that it is not so difficult to control, which means, you do "click once", then the tool will give you a bunch of files out of my control, not so easy to maintain. Thanks. Peter

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  • Runing bcdedit from python in Windows 2008 SP2

    - by Lee-Man
    I do not know windows well, so that may explain my dilemma ... I am trying to run bcdedit in Windows 2008R2 from Python 2.6. My Python routine to run a command looks like this: def run_program(cmd_str): """Run the specified command, returning its output as an array of lines""" dprint("run_program(%s): entering" % cmd_str) cmd_args = cmd_str.split() subproc = subprocess.Popen(cmd_args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True) (outf, errf) = (subproc.stdout, subproc.stderr) olines = outf.readlines() elines = errf.readlines() if Options.debug: if elines: dprint('Error output:') for line in elines: dprint(line.rstrip()) if olines: dprint('Normal output:') for line in olines: dprint(line.rstrip()) errf.close() outf.close() res = subproc.wait() dprint('wait result=', res) return (res, olines) I call this function thusly: (res, o) = run_program('bcdedit /set {current} MSI forcedisable') This command works when I type it from a cmd window, and it works when I put it in a batch file and run it from a command window (as Administrator, of course). But when I run it from Python (as Administrator), Python claims it can't find the command, returning: bcdedit is not recognized as an internal or external command, operable program or batch file Also, if I trying running my batch file from Python (which works from the command line), it also fails. I've also tried it with the full path to bcdedit, with the same results. What is it about calling bcdedit from Python that makes it not found? Note that I can call other EXE files from Python, so I have some level of confidence that my Python code is sane ... but who knows. Any help would be most appreciated.

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  • Remove robot as an editor of a blip

    - by Lee
    I have a Google Wave robot which makes changes to some blip content depending on what a user inputs. When this edit is made, the robot is listed in the blip as one of the people who have edited it (so shows its Avatar and robot name). I was wondering if anyone knew if it was possible (and if so how), to stop the robot being listed as an editor (either by it not happening in the first place, or removing it afterwards).

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  • translate ia32 into C

    - by David Lee
    I am trying to translate the following: Action: push %ebp #function prolog mov %esp, %ebp sub $0x10, %esp mov 0x8(%ebp), %eax #first line compiles to these 4 lines imul 0x8(%ebp), %eax sub $0x7, %eax mov %eax, -0x4(%ebp) addl $0x8, 0xc(%ebp) #second line mov -0x4(%ebp), %eax #third line mov 0xc(%ebp), %edx mov (%edx, %eax, 4), %eax add $0x3, %eax movb $0x41, (%eax) leave ret So far I have the following: //What am I missing? void Action(int x, char **y) { int z = x * x - 7; y+=8; //missing third line } What is the best way to translate this?

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  • Calling services from the Orchestrating layer in SOA?

    - by Martin Lee
    The Service Oriented Architecture Principles site says that Service Composition is an important thing in SOA. But Service Loose Coupling is important as well. Does that mean that the "Orchestrating layer" should be the only one that is allowed to make calls to services in the system? As I understand SOA, the "Orchestrating layer" 'glues' all the services together into one software application. I tried to depict that on Fig.A and Fig.B. The difference between the two is that on Fig.A the application is composed of services and all the logic is done in the "Orchestrating layer" (all calls to services are done from the "Orchestrating layer" only). On Fig.B the application is composed from services, but one service calls another service. Does the architecture on Fig.B violate the "Service Loose Coupling" principle of SOA? Can a service call another service in SOA? And more generally, can the architecture on Fig.A be considered superior to the one on Fig.B in terms of service loose coupling, abstraction, reusability, autonomy, etc.? My guess is that the A architecture is much more universal, but it can add some unnecessary data transfers between the "Orchestrating layer" and all the called services.

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  • Django + Pydev/Eclipse + Google App Engine - possible?

    - by Lee Tang
    Has anyone been able to get Google App Engine/Django working in Pydev/Eclipse? I tried this but had difficulty getting Pydev to recognize all of the externally linked folders (django plugins) that I was referencing. I ended up copying all of those folders into the project en masse, rather than referencing them, resulting in a massively bloated project folder - it was really an unworkable solution that eventually made me give up the whole project. So, I'm wondering if anyone has tried this or has any idea what I might have been doing wrong. (Keep in mind this was my first attempt at using Pydev, Django, App Engine and Python!!)

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