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• Linux vs OS X multi-core handling - which is better?

  - by Cyrcle

  Can some folks who are familiar with the guts of Linux and OS X comment on which is better at handling multi-core CPUs? Thanks

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• Database with 5 Tables with Insert and Select

  - by kirbby

  hi guys, my problem is that i have 5 tables and need inserts and selects. what i did is for every table a class and there i wrote the SQL Statements like this public class Contact private static String IDCont = "id_contact"; private static String NameCont = "name_contact"; private static String StreetCont = "street_contact"; private static String Street2Cont = "street2_contact"; private static String Street3Cont = "street3_contact"; private static String ZipCont = "zip_contact"; private static String CityCont = "city_contact"; private static String CountryCont = "country_contact"; private static String Iso2Cont = "iso2_contact"; private static String PhoneCont = "phone_contact"; private static String Phone2Cont = "phone2_contact"; private static String FaxCont = "fax_contact"; private static String MailCont = "mail_contact"; private static String Mail2Cont = "mail2_contact"; private static String InternetCont = "internet_contact"; private static String DrivemapCont = "drivemap_contact"; private static String PictureCont = "picture_contact"; private static String LatitudeCont = "latitude_contact"; private static String LongitudeCont = "longitude_contact"; public static final String TABLE_NAME = "contact"; public static final String SQL_CREATE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(" + IDCont + "INTEGER not NULL," + NameCont + " TEXT not NULL," + StreetCont + " TEXT," + Street2Cont + " TEXT," + Street3Cont + " TEXT," + ZipCont + " TEXT," + CityCont + " TEXT," + CountryCont + " TEXT," + Iso2Cont + " TEXT," + PhoneCont + " TEXT," + Phone2Cont + " TEXT," + FaxCont + " TEXT," + MailCont + " TEXT," + Mail2Cont + " TEXT," + InternetCont + " TEXT," + //website of the contact DrivemapCont + " TEXT," + //a link to a drivemap to the contact PictureCont + " TEXT," + //a photo of the contact building (contact is not a person) LatitudeCont + " TEXT," + LongitudeCont + " TEXT," + "primary key(id_contact)" + "foreign key(iso2)"; and my insert looks like this public boolean SQL_INSERT_CONTACT(int IDContIns, String NameContIns, String StreetContIns, String Street2ContIns, String Street3ContIns, String ZipContIns, String CityContIns, String CountryContIns, String Iso2ContIns, String PhoneContIns, String Phone2ContIns, String FaxContIns, String MailContIns, String Mail2ContIns, String InternetContIns, String DrivemapContIns, String PictureContIns, String LatitudeContIns, String LongitudeContIns) { try{ db.execSQL("INSERT INTO " + "contact" + "(" + IDCont + ", " + NameCont + ", " + StreetCont + ", " + Street2Cont + ", " + Street3Cont + ", " + ZipCont + ", " + CityCont + ", " + CountryCont + ", " + Iso2Cont + ", " + PhoneCont + ", " + Phone2Cont + ", " + FaxCont + ", " + MailCont + ", " + Mail2Cont + ", " + InternetCont + ", " + DrivemapCont + ", " + PictureCont + ", " + LatitudeCont + ", " + LongitudeCont + ") " + "VALUES (" + IDContIns + ", " + NameContIns +", " + StreetContIns + ", " + Street2ContIns + ", " + Street3ContIns + ", " + ZipContIns + ", " + CityContIns + ", " + CountryContIns + ", " + Iso2ContIns + ", " + PhoneContIns + ", " + Phone2ContIns + ", " + FaxContIns + ", " + MailContIns + ", " + Mail2ContIns + ", " + InternetContIns + ", " + DrivemapContIns + ", " + PictureContIns + ", " + LatitudeContIns + ", " + LongitudeContIns +")"); return true; } catch (SQLException e) { return false; } } i have a DBAdapter class there i created the database public class DBAdapter { public static final String DB_NAME = "mol.db"; private static final int DB_VERSION = 1; private static final String TAG = "DBAdapter"; //to log private final Context context; private SQLiteDatabase db; public DBAdapter(Context context) { this.context = context; OpenHelper openHelper = new OpenHelper(this.context); this.db = openHelper.getWritableDatabase(); } public static class OpenHelper extends SQLiteOpenHelper { public OpenHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL(Contact.SQL_CREATE); db.execSQL(Country.SQL_CREATE); db.execSQL(Picture.SQL_CREATE); db.execSQL(Product.SQL_CREATE); db.execSQL(Project.SQL_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub Log.w(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL(Contact.SQL_DROP); db.execSQL(Country.SQL_DROP); db.execSQL(Picture.SQL_DROP); db.execSQL(Product.SQL_DROP); db.execSQL(Project.SQL_DROP); onCreate(db); } i found so many different things and tried them but i didn't get anything to work... i need to know how can i access the database in my activity and how i can get the insert to work and is there sth wrong in my code? thanks for your help thats how i tried to get it into my activity public class MainTabActivity extends TabActivity { private Context context; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.maintabactivity); TabHost mTabHost = getTabHost(); Intent intent1 = new Intent().setClass(this,MapOfLight.class); //Intent intent2 = new Intent().setClass(this,Test.class); //Testactivity //Intent intent2 = new Intent().setClass(this,DetailView.class); //DetailView Intent intent2 = new Intent().setClass(this,ObjectList.class); //ObjectList //Intent intent2 = new Intent().setClass(this,Gallery.class); //Gallery Intent intent3 = new Intent().setClass(this,ContactDetail.class); mTabHost.addTab(mTabHost.newTabSpec("tab_mol").setIndicator(this.getText(R.string.mol), getResources().getDrawable(R.drawable.ic_tab_mol)).setContent(intent1)); mTabHost.addTab(mTabHost.newTabSpec("tab_highlights").setIndicator(this.getText(R.string.highlights),getResources().getDrawable(R.drawable.ic_tab_highlights)).setContent(intent2)); mTabHost.addTab(mTabHost.newTabSpec("tab_contacts").setIndicator(this.getText(R.string.contact),getResources().getDrawable(R.drawable.ic_tab_contact)).setContent(intent3)); mTabHost.setCurrentTab(1); SQLiteDatabase db; DBAdapter dh = null; OpenHelper openHelper = new OpenHelper(this.context); dh = new DBAdapter(this); db = openHelper.getWritableDatabase(); dh.SQL_INSERT_COUNTRY("AT", "Austria", "AUT"); } } i tried it with my country table because it has only 3 columns public class Country { private static String Iso2Count = "iso2_country"; private static String NameCount = "name_country"; private static String FlagCount = "flag_image_url_country"; public static final String TABLE_NAME = "country"; public static final String SQL_CREATE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(" + Iso2Count + " TEXT not NULL," + NameCount + " TEXT not NULL," + FlagCount + " TEXT not NULL," + "primary key(iso2_country)"; public boolean SQL_INSERT_COUNTRY(String Iso2CountIns, String NameCountIns, String FlagCountIns) { try{ db.execSQL("INSERT INTO " + "country" + "(" + Iso2Count + ", " + NameCount + ", " + FlagCount + ") " + "VALUES ( " + Iso2CountIns + ", " + NameCountIns +", " + FlagCountIns + " )"); return true; } catch (SQLException e) { return false; } } another question is it better to put the insert and select from each table into a separate class, so i have 1 class for each table or put them all into the DBAdapter class?

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• Sockets: Transport endpoint is not connected on send

  - by TheoretiCAL

  I'm trying to learn socket programming from http://beej.us/guide/bgnet/output/html/singlepage/bgnet.html and am attempting to build a SOCK_STREAM client/server. My client: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #define SERVERPORT "4951" // the port users will be connecting to int main(int argc, char *argv[]) { int sockfd; struct addrinfo hints, *servinfo, *p; int rv; int numbytes; if (argc != 3) { fprintf(stderr,"usage: talker hostname message\n"); exit(1); } memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; if ((rv = getaddrinfo(argv[1], SERVERPORT, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv)); return 1; } // loop through all the results and make a socket for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("talker: socket"); continue; if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror("client: connect"); continue; } } break; } if (p == NULL) { fprintf(stderr, "talker: failed to bind socket\n"); return 2; } if ((numbytes = send(sockfd, argv[2], strlen(argv[2]), 0) == -1)) { perror("talker: send"); exit(1); } freeaddrinfo(servinfo); printf("talker: sent %d bytes to %s\n", numbytes, argv[1]); close(sockfd); return 0; } Server: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #define MYPORT "4951" // the port users will be connecting to #define MAXBUFLEN 100 static int backlog = 10; // get sockaddr, IPv4 or IPv6: void *get_in_addr(struct sockaddr *sa) { if (sa->sa_family == AF_INET) { return &(((struct sockaddr_in*)sa)->sin_addr); } return &(((struct sockaddr_in6*)sa)->sin6_addr); } int main(void) { int sockfd; struct addrinfo hints, *servinfo, *p; int rv; int numbytes; int new_fd; socklen_t addr_size; struct sockaddr_storage their_addr; char buf[MAXBUFLEN]; char s[INET6_ADDRSTRLEN]; memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; // set to AF_INET to force IPv4 hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; // use my IP if ((rv = getaddrinfo(NULL, MYPORT, &hints, &servinfo)) != 0) { fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv)); return 1; } // loop through all the results and bind to the first we can for(p = servinfo; p != NULL; p = p->ai_next) { if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) { perror("listener: socket"); continue; } int yes=1; // lose the pesky "Address already in use" error message if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) { perror("setsockopt"); exit(1); } if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) { close(sockfd); perror("listener: bind"); continue; } if (listen(sockfd,backlog) == -1){ close(sockfd); perror("listener:listen"); continue; } break; } if (p == NULL) { fprintf(stderr, "listener: failed to bind socket\n"); return 2; } freeaddrinfo(servinfo); printf("listener: waiting to recv..\n"); while(1){ addr_size = sizeof their_addr; if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &addr_size))==-1){ perror("accept"); exit(1); } if ((numbytes = recv(new_fd, buf, MAXBUFLEN-1 , 0) == -1)) { perror("recv"); exit(1); } printf("listener: got packet from %s\n", inet_ntop(their_addr.ss_family, get_in_addr((struct sockaddr *)&their_addr), s, sizeof s)); printf("listener: packet is %d bytes long\n", numbytes); buf[numbytes] = '\0'; printf("listener: packet contains \"%s\"\n", buf); close(sockfd); } return 0; } Upon executing the client, I get " send: Transport endpoint is not connected" and I'm not sure where I went wrong. Thanks.

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• Jquery counting elements by class what is the best way to implement this?

  - by 133794m3r

  Ok what i'm trying to do is to count all of the elements in the current page with the same class and then i'm going to use it to be added onto a name for a input form. Basically i'm allowing users to click on an and then by doing so add another one for more of the same type of items. But i can't think of a way to count all of these simply with jquery/javascript. I was going to then name the item as something like name="whatever(total+1)", if anyone has a simple way to do this i'd be extremely grateful as javascript isn't exactly my native tongue and stack overflow usually has a ton of great answers and a great community so i'm hoping my query will not go unheard.

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• C++ Template const char array to int

  - by Levi Schuck

  So, I'm wishing to be able to have a static const compile time struct that holds some value based on a string by using templates. I only desire up to four characters. I know that the type of 'abcd' is int, and so is 'ab','abc', and although 'a' is of type char, it works out for a template<int v> struct What I wish to do is take sizes of 2,3,4,5 of some const char, "abcd" and have the same functionality as if they used 'abcd'. Note that I do not mean 1,2,3, or 4 because I expect the null terminator. cout << typeid("abcd").name() << endl; tells me that the type for this hard coded string is char const [5], which includes the null terminator on the end. I understand that I will need to twiddle the values as characters, so they are represented as an integer. I cannot use constexpr since VS10 does not support it (VS11 doesn't either..) So, for example with somewhere this template defined, and later the last line template <int v> struct something { static const int value = v; }; //Eventually in some method cout << typeid(something<'abcd'>::value).name() << endl; works just fine. I've tried template<char v[5]> struct something2 { static const int value = v[0]; } template<char const v[5]> struct something2 { static const int value = v[0]; } template<const char v[5]> struct something2 { static const int value = v[0]; } All of them build individually, though when I throw in my test, cout << typeid(something2<"abcd">::value).name() << endl; I get 'something2' : invalid expression as a template argument for 'v' 'something2' : use of class template requires template argument list Is this not feasible or am I misunderstanding something?

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• Using new to allocate an array of class elements with an overloaded constructor in C++.

  - by GordoN

  As an example say I have a class foo that does not have a default constructor but one that looks like this foo:foo(int _varA,int _varB) { m_VarA = _varA; m_VarB = _varB; } How would I allocate an array of these. I seem to remember trying somthing like this unsuccessfully. foo* MyArray = new foo[100](25,14). I don't think this will work either. foo* MyArray = new foo[100](25,14) Can this be done? I typically do this by writing the default constructor using some preset values for _varA and _varB. Then adding a function to reset _varA and _varB for each element but that will not work for this case. Thanks for the help.

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• Does <T> need to be imported as a class for this to work?

  - by zxc

  In order for this to work, do you have to have an import statement for the T class? private static <T> void invertOrdering(List<T> list) { for (int i = 0; i < list.size() / 2; i++) { int j = list.size() - 1 - i; T item1 = list.get(i); T item2 = list.get(j); list.set(i, item2); list.set(j, item1); } }

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• generate php classes in bash

  - by Derek

  i have this script: #!/bin/bash if [[ -z "$1" ]] ; then echo "Class is required" exit 1; fi if [[ -z "$2" ]] ; then package="Default" else package=$2; fi echo "<?php /** * $1.class.php * * Vcard class file. * @name Project * @author Author * @link http://www.domain.com * @copyright Copyright © 2011 * @package $package * @version 1.0 */ /** * The main $1 class * @package $package */ class $1 { /** * Constructor setup. */ public function __construct() { } /** * Destructor setup. */ public function __destruct() { } } " > $1.class.php php -l $1.class.php echo "Done"; if i do: ./generate.sh my_class it creates everything with my_class. how can i modify this to: MyClass? i need to use MyClass for the filename, and the class name etc... later in the code i use the argument (in this case my_class) for some other purposes. thanks

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• Nullable type conversion in C#?

  - by dinesh

  Hi can we assign null value to struct type of variable? struct MyStruct { } MyStruct var = null; is this is possible in C# .net? if not ? then how C# is allowing Nullable < T struct type of variable can be assigned as null?

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• Anchors with overlapping divs

  - by tmdelane

  I am using a grid based layout, with two main sections. Graph and Timeline. Graph, contains graded vertical bars, HTML similar to: <div id="graph" class="container_160"> <div id="Jan-97" class="grid_1 major"><a href="#">&nbsp;</a></div> <div id="Feb-97" class="grid_1 minor"><a href="#">&nbsp;</a></div> <div id="Mar-97" class="grid_1 minor"><a href="#">&nbsp;</a></div> <div id="Apr-97" class="grid_1 minor"><a href="#">&nbsp;</a></div> <div id="May-97" class="grid_1 minor"><a href="#">&nbsp;</a></div> etc... </div> Timeline, contains horizontal bars, HTML similar to: <div id="timeline" class="container_160"> <div id="bar1" class="grid_32 suffix_128"><a href="#">&nbsp;</a></div> <div id="bar2" class="prefix_32 grid_24 suffix_104"><a href="#">&nbsp;</a></div> <div id="bar3" class="prefix_58 grid_7 suffix_95"><a href="#">&nbsp;</a></div> </div> Timeline is relatively positioned to Graph so that it overlaps. My problem is that when these divs overlap, the anchors in Timeline stop working. I am open to both CSS and Jquery solutions. Thanks in advance. t.

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• Is it bad practice to assign a css class for the sole purpose of finding it with jQuery?

  - by user187305

  I'm using ASP.NET, not the newest one with that clientIdMode stuff. So, the control ids are generated and funky. There are lots of ways of passing ids around, but lately I've been assigning a 'fake' css class to the control I'm interested in. Then in a js file I use jQuery to find the control. Is this bad practice? It seems a lot like the ajaxControlToolkit's behaviorId to me... Is the behaviorId bad practice as well?

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• In place SQL 2008 upgrade vs. Side by side?

  - by Jim

  I have a SQL 2005 Std edition server with 5 databases in production, 4 db's are used by web-based apps the 5th is a desktop application. My question is should I perform an in-place upgrade or a side-by-side by creating an sql2008 instance on the same box? The machine is a VM on vmware and I'm planning on taking a snapshot before the upgrade and having a 'blackout' window during the upgrade so that I could roll back to the snapshot if things go really bad. Any previous experience and advice is appreciated.

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• static constants return instance of specific class in Flex?

  - by Sang

  So here's what I mean. Let's say I have a class ErrorMessages which holds all my error messages as static constants. So I could access them like ErrorMessages.PASSWORD_INVALID or ErrorMessage.PASSWORD_TOO_SHORT. I want to know if it is possible to have separate classes that hold subset of these constants and access them like ErrorMessages.PASSWORD.INVALID or ErrorMessages.PASSWORD.TOO_SHORT, etc. This way I can more structured static structure and makes it much easier to use autocomplete. I tried few different ways and couldn't figure out if this was possible..

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• Derived template override return type of member function C++

  - by Ruud v A

  I am writing matrix classes. Take a look at this definition: template <typename T, unsigned int dimension_x, unsigned int dimension_y> class generic_matrix { ... generic_matrix<T, dimension_x - 1, dimension_y - 1> minor(unsigned int x, unsigned int y) const { ... } ... } template <typename T, unsigned int dimension> class generic_square_matrix : public generic_matrix<T, dimension, dimension> { ... generic_square_matrix(const generic_matrix<T, dimension, dimension>& other) { ... } ... void foo(); } The generic_square_matrix class provides additional functions like matrix multiplication. Doing this is no problem: generic_square_matrix<T, 4> m = generic_matrix<T, 4, 4>(); It is possible to assign any square matrix to M, even though the type is not generic_square_matrix, due to the constructor. This is possible because the data does not change across children, only the supported functions. This is also possible: generic_square_matrix<T, 4> m = generic_square_matrix<T, 5>().minor(1,1); Same conversion applies here. But now comes the problem: generic_square_matrix<T, 4>().minor(1,1).foo(); //problem, foo is not in generic_matrix<T, 3, 3> To solve this I would like generic_square_matrix::minor to return a generic_square_matrix instead of a generic_matrix. The only possible way to do this, I think is to use template specialisation. But since a specialisation is basically treated like a separate class, I have to redefine all functions. I cannot call the function of the non-specialised class as you would do with a derived class, so I have to copy the entire function. This is not a very nice generic-programming solution, and a lot of work. C++ almost has a solution for my problem: a virtual function of a derived class, can return a pointer or reference to a different class than the base class returns, if this class is derived from the class that the base class returns. generic_square_matrix is derived from generic_matrix, but the function does not return a pointer nor reference, so this doesn't apply here. Is there a solution to this problem (possibly involving an entirely other structure; my only requirements are that the dimensions are a template parameter and that square matrices can have additional functionality). Thanks in advance, Ruud

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• php extending but with a new constructor...possible?

  - by Patrick

  I have a class: class test { function __construct() { print 'hello'; } function func_one() { print 'world'; } } what I would like to do is a have a class that sort of extends the test class. I say 'sort of', because the class needs to be able to run whatever function the test class is able to run, but NOT run the construct unless I ask it to. I do not want to override the construct. Anyone has any idea how to achieve this?

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• Writing a printList method for a Scheme interpreter in C

  - by Rehan Rasool

  I am new to C and working on making an interpreter for Scheme. I am trying to get a suitable printList method to traverse through the structure. The program takes in an input like: (a (b c)) and internally represent it as: [""][ ][ ]--> [""][ ][/] | | ["A"][/][/] [""][ ][ ]--> [""][ ][/] | | ["B"][/][/] ["C"][/][/] Right now, I just want the program to take in the input, make the appropriate cell structure internally and print out the cell structure, thereby getting (a (b c)) at the end. Here is my struct: typedef struct conscell *List; struct conscell { char symbol; struct conscell *first; struct conscell *rest; }; void printList(char token[20]){ List current = S_Expression(token, 0); printf("("); printf("First Value? %c \n", current->first->symbol); printf("Second value? %c \n", current->rest->first->first->symbol); printf("Third value? %c \n", current->rest->first->rest->first->symbol); printf(")"); } In the main method, I get the first token and call: printList(token); I tested the values again for the sublists and I think it is working. However, I will need a method to traverse through the whole structure. Please look at my printList code again. The print calls are what I have to type, to manually get the (a (b c)) list values. So I get this output: First value? a First value? b First value? c It is what I want, but I want a method to do it using a loop, no matter how complex the structure is, also adding brackets where appropriate, so in the end, I should get: (a (b c)) which is the same as the input. Can anyone please help me with this?

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• What is the official Microsoft name for Windows 8 versions: Intel compatible vs. ARM?

  - by Clay Nichols

  Windows 8 will, AFAIK, be available in two very different flavors: One that supports old Windows programs (intel processor, I think) and the other will be an ARM processor which does NOT support x86 programs. I need to know how to refer to these to let customers clearly know which version of Windows we (currently) support. It looks like the terminology is: Windows 8 : This will be backward compatible with Win 32 apps. Windows RT: Runs on ARM-based processor devices (probably mainly tablets) and does not support

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• How to default-initialize local variables of built-in types in C++?

  - by sharptooth

  How do I default-initialize a local variable of primitive type in C++? For example if a have a typedef: typedef unsigned char boolean;//that's Microsoft RPC runtime typedef I'd like to change the following line: boolean variable = 0; //initialize to some value to ensure reproduceable behavior retrieveValue( &variable ); // do actual job into something that would automagically default-initialize the variable - I don't need to assign a specific value to it, but instead I only need it to be intialized to the same value each time the program runs - the same stuff as with a constructor initializer list where I can have: struct Struct { int Value; Struct() : Value() {} }; and the Struct::Value will be default-initialized to the same value every time an instance is cinstructed, but I never write the actual value in the code. How can I get the same behavior for local variables?

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• Can I have two names for the same variable?

  - by Roman

  The short version of the question: I do: x = y. Then I change x, and y is unchanged. What I want is to "bind" x and y in such a way that I change y whenever I change x. The extended version (with some details): I wrote a class ("first" class) which generates objects of another class ("second" class). In more details, every object of the second class has a name as a unique identifier. I call a static method of the first class with a name of the object from the second class. The first class checks if such an object was already generated (if it is present in the static HashMap of the first class). If it is already there, it is returned. If it is not yet there, it is created, added to the HashMap and returned. And then I have the following problem. At some stage of my program, I take an object with a specific name from the HashMap of the first class. I do something with this object (for example change values of some fields). But the object in the HashMap does not see these changes! So, in fact, I do not "take" an object from the HashMap, I "create a copy" of this object and this is what I would like to avoid.

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• Java: refactoring static constants

  - by akf

  We are in the process of refactoring some code. There is a feature that we have developed in one project that we would like to now use in other projects. We are extracting the foundation of this feature and making it a full-fledged project which can then be imported by its current project and others. This effort has been relatively straight-forward but we have one headache. When the framework in question was originally developed, we chose to keep a variety of constant values defined as static fields in a single class. Over time this list of static members grew. The class is used in very many places in our code. In our current refactoring, we will be elevating some of the members of this class to our new framework, but leaving others in place. Our headache is in extracting the foundation members of this class to be used in our new project, and more specifically, how we should address those extracted members in our existing code. We know that we can have our existing Constants class subclass this new project's Constants class and it would inherit all of the parent's static members. This would allow us to effect the change without touching the code that uses these members to change the class name on the static reference. However, the tight coupling inherent in this choice doesn't feel right. before: public class ConstantsA { public static final String CONSTANT1 = "constant.1"; public static final String CONSTANT2 = "constant.2"; public static final String CONSTANT3 = "constant.3"; } after: public class ConstantsA extends ConstantsB { public static final String CONSTANT1 = "constant.1"; } public class ConstantsB { public static final String CONSTANT2 = "constant.2"; public static final String CONSTANT3 = "constant.3"; } In our existing code branch, all of the above would be accessible in this manner: ConstantsA.CONSTANT2 I would like to solicit arguments about whether this is 'acceptable' and/or what the best practices are.

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• An html input box isn't being displayed, Firebug says it has style="display: none" but I haven't don

  - by Ankur

  I have placed a form on a page which looks like this: <form id="editClassList" name="editClassList" method="get" action="EditClassList"> <label> <input name="class-to-add" id="class-to-add" size="42" type="text"> </label> <label> <input name="save-class-btn" id="save-class-btn" value="Save Class(es)" type="submit"> </label> </form> But when it get's rendered by a browser it comes out like this: <form id="editClassList" name="editClassList" method="get" action="EditClassList"> <label> <input style="display: none;" name="class-to-add" id="class-to-add" size="42" type="text"> </label> <label> <input name="save-class-btn" id="save-class-btn" value="Save Class(es)" type="submit"> </label> </form> For some reason style="display: none;" is being added, and I cann't understand why. This results in the text box not displaying.

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• how can i check all ul of nested checkboxes

  - by Mike

  Question: I have a category listing which some categories have children, I am trying to create a ALL category that when clicked, will check all sibling checkboxes in that same category. e.g; clicking ALL underneath the MUSIC category would check blues, jazz, rock n roll Code: HTML: <ul name="events-categories" id="events-categories"> <li><input type="checkbox" name="category-events" value="185" placeholder="" id="category-185" class="events-category"> CONVENTIONS <ul class="event-children"> <li><input type="checkbox" name="child-category-all" value="" class="events-child-category-all">ALL</li> <li><input type="checkbox" name="child-category-190" value="190" id="child-category-190" class="child events-child-category">SCIENCE</li> <li><input type="checkbox" name="child-category-191" value="191" id="child-category-191" class="child events-child-category">TECHNOLOGY</li> </ul> </li> <li><input type="checkbox" name="category-events" value="184" placeholder="" id="category-184" class="events-category"> MUSIC <ul class="event-children"> <li><input type="checkbox" name="child-category-all" value="" class="events-child-category-all">ALL</li> <li><input type="checkbox" name="child-category-189" value="189" id="child-category-189" class="child events-child-category">BLUES</li> <li><input type="checkbox" name="child-category-188" value="188" id="child-category-188" class="child events-child-category">JAZZ</li> <li><input type="checkbox" name="child-category-187" value="187" id="child-category-187" class="child events-child-category">ROCK N ROLL</li> </ul> </li> <li><input type="checkbox" name="category-events" value="186" placeholder="" id="category-186" class="events-category"> TRIBUTES</li> </ul>? CSS: .event-children { margin-left: 20px; list-style: none; display: none; }? jQuery So Far: /** * left sidebar events categories * toggle sub categories */ $('.events-category').change( function(){ console.log('showing sub categories'); var c = this.checked; if( c ){ $(this).next('.event-children').css('display', 'block'); }else{ $(this).next('.event-children').css('display', 'none'); } }); $('.events-child-category-all').change( function(){ var c = this.checked; if( c ){ $(this).siblings(':checkbox').attr('checked',true); }else{ $(this).siblings(':checkbox').attr('checked',false); } });? jsfiddle: http://jsfiddle.net/SENV8/

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• How to change name attribut value from twig

  - by taieb baccouch

  I am using Symfony version 2.3 and twig version 1.0. and I'm trying to change the name attribut value. Here is my code : <div class="control-group"> {{ form_label(form.menuTitle, null, {'label_attr': {'class': 'control-label'}}) }} {{ form_errors(form.menuTitle)}} <div class="controls"> <div class="span12"> {{ form_widget(form.menuTitle, {'attr': {'class': 'span6'}}) }} </div> </div> </div> The rendering code : <div class="control-group"> <label class="control-label required" for="smart_contactbundle_contact_menuTitle">Menu title</label> <div class="controls"> <div class="span12"> <input type="text" id="smart_contactbundle_contact_menuTitle" name="smart_contactbundle_contact[menuTitle]" required="required" maxlength="255" class="span6"> </div> </div> </div> I want to change name="smart_contactbundle_contact[menuTitle]" to name="menuTitle"

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• What are the drawbacks of this Classing format?

  - by Keysle

  This is a 3 layer example of my classing format function __(_){return _.constructor} //class var _ = ( CLASS = function(){ this.variable = 0; this.sub = new CLASS.SUBCLASS(); }).prototype; _.func = function(){ alert('lvl'+this.variable); this.sub.func(); } _.divePeak = function(){ alert('lvl'+this.variable); this.sub.variable += 5; } //sub class _ = ( __(_).SUBCLASS = function(){ this.variable = 1; this.sub = new CLASS.SUBCLASS.DEEPCLASS(); }).prototype; _.func = function(){ alert('lvl'+this.variable); this.sub.func(); } //deep class _ = ( __(_).DEEPCLASS = function(){ this.variable = 2; }).prototype; _.func = function(){ alert('lvl'+this.variable); } Before you blow a gasket, let me explain myself. The purpose behind the underscores is to accelerate the time needed to specify functions for a class and also specify sub classes of a class. To me it's easier to read. I KNOW, this does interfere with underscore.js if you intend to use it in your classes. I'm sure _.js can be easily switched over to another $ymbol though ... oh wait, But I digress. Why have classes within a class? because solar.system() and social.system() mean two totally different things but it's convenient to use the same name. Why user underscores to manage the definition of the class? because "Solar.System.prototype" took me about 2 seconds to type out and 2 typos to correct. It also keeps all function names for all classes in the same column of texts, which is nice for legibility. All I'm doing is presenting my reasoning behind this method and why I came up with it. I'm 3 days into learning OO JS and I am very willing to accept that I might have messed up.

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• In Java how instance of and type cast(i.e (ClassName)) works on proxy object ?

  - by learner

  Java generates a proxy class for a given interface and provides the instance of the proxy class. But when we type cast the proxy object to our specific Object, how java handles this internally? Is this treated as special scenario? For example I have class 'OriginalClass' and it implements 'OriginalInterface', when I create proxy object by passing 'OriginalInterface' interface java created proxy class 'ProxyClass' using methods in the provided interface and provides object of this class(i.e ProxyClass). If my understanding is correct then can you please answer following queries 1) When I type cast object of ProxyClass to my class OriginalClass this works, but how java is allowing this? Same in case of instace of? 2) As my knowledge java creates a proxy class only with the methods, but what happen when I try to access attributes on this object? 3) Only interface methods are getting implemented in Proxy, but what happens when I try to access a method which not in interface and only mentioned in the class? Thanks, Student

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