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  • can't install psycopg2 in my env on mac os x lion

    - by Alexander Ovchinnikov
    I tried install psycopg2 via pip in my virtual env, but got this error: ld: library not found for -lpq (full log here: http://pastebin.com/XdmGyJ4u ) I tried install postgres 9.1 from .dmg and via port, (gksks)iMac-Alexander:~ lorddaedra$ locate libpq /Developer/SDKs/MacOSX10.7.sdk/usr/include/libpq /Developer/SDKs/MacOSX10.7.sdk/usr/include/libpq/libpq-fs.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/libpq-events.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/libpq-fe.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/internal/libpq /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/internal/libpq/pqcomm.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/internal/libpq-int.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/auth.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/be-fsstubs.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/crypt.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/hba.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/ip.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/libpq-be.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/libpq-fs.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/libpq.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/md5.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/pqcomm.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/pqformat.h /Developer/SDKs/MacOSX10.7.sdk/usr/include/postgresql/server/libpq/pqsignal.h /Developer/SDKs/MacOSX10.7.sdk/usr/lib/libpq.5.3.dylib /Developer/SDKs/MacOSX10.7.sdk/usr/lib/libpq.5.dylib /Developer/SDKs/MacOSX10.7.sdk/usr/lib/libpq.a /Developer/SDKs/MacOSX10.7.sdk/usr/lib/libpq.dylib /Library/PostgreSQL/9.1/doc/postgresql/html/install-windows-libpq.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-async.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-build.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-cancel.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-connect.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-control.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-copy.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-envars.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-events.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-example.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-exec.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-fastpath.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-ldap.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-misc.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-notice-processing.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-notify.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-pgpass.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-pgservice.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-ssl.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-status.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq-threading.html /Library/PostgreSQL/9.1/doc/postgresql/html/libpq.html /Library/PostgreSQL/9.1/include/libpq /Library/PostgreSQL/9.1/include/libpq/libpq-fs.h /Library/PostgreSQL/9.1/include/libpq-events.h /Library/PostgreSQL/9.1/include/libpq-fe.h /Library/PostgreSQL/9.1/include/postgresql/internal/libpq /Library/PostgreSQL/9.1/include/postgresql/internal/libpq/pqcomm.h /Library/PostgreSQL/9.1/include/postgresql/internal/libpq-int.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq /Library/PostgreSQL/9.1/include/postgresql/server/libpq/auth.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/be-fsstubs.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/crypt.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/hba.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/ip.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/libpq-be.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/libpq-fs.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/libpq.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/md5.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/pqcomm.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/pqformat.h /Library/PostgreSQL/9.1/include/postgresql/server/libpq/pqsignal.h /Library/PostgreSQL/9.1/lib/libpq.5.4.dylib /Library/PostgreSQL/9.1/lib/libpq.5.dylib /Library/PostgreSQL/9.1/lib/libpq.a /Library/PostgreSQL/9.1/lib/libpq.dylib /Library/PostgreSQL/9.1/lib/postgresql/libpqwalreceiver.so /Library/PostgreSQL/9.1/pgAdmin3.app/Contents/Frameworks/libpq.5.dylib /Library/PostgreSQL/psqlODBC/lib/libpq.5.4.dylib /Library/PostgreSQL/psqlODBC/lib/libpq.5.dylib /Library/PostgreSQL/psqlODBC/lib/libpq.dylib /Library/WebServer/Documents/postgresql/html/install-windows-libpq.html /Library/WebServer/Documents/postgresql/html/libpq-async.html /Library/WebServer/Documents/postgresql/html/libpq-build.html /Library/WebServer/Documents/postgresql/html/libpq-cancel.html /Library/WebServer/Documents/postgresql/html/libpq-connect.html /Library/WebServer/Documents/postgresql/html/libpq-control.html /Library/WebServer/Documents/postgresql/html/libpq-copy.html /Library/WebServer/Documents/postgresql/html/libpq-envars.html /Library/WebServer/Documents/postgresql/html/libpq-events.html /Library/WebServer/Documents/postgresql/html/libpq-example.html /Library/WebServer/Documents/postgresql/html/libpq-exec.html /Library/WebServer/Documents/postgresql/html/libpq-fastpath.html /Library/WebServer/Documents/postgresql/html/libpq-ldap.html /Library/WebServer/Documents/postgresql/html/libpq-misc.html /Library/WebServer/Documents/postgresql/html/libpq-notice-processing.html /Library/WebServer/Documents/postgresql/html/libpq-notify.html /Library/WebServer/Documents/postgresql/html/libpq-pgpass.html /Library/WebServer/Documents/postgresql/html/libpq-pgservice.html /Library/WebServer/Documents/postgresql/html/libpq-ssl.html /Library/WebServer/Documents/postgresql/html/libpq-status.html /Library/WebServer/Documents/postgresql/html/libpq-threading.html /Library/WebServer/Documents/postgresql/html/libpq.html /opt/local/include/postgresql90/internal/libpq /opt/local/include/postgresql90/internal/libpq/pqcomm.h /opt/local/include/postgresql90/internal/libpq-int.h /opt/local/include/postgresql90/libpq /opt/local/include/postgresql90/libpq/libpq-fs.h /opt/local/include/postgresql90/libpq-events.h /opt/local/include/postgresql90/libpq-fe.h /opt/local/include/postgresql90/server/libpq /opt/local/include/postgresql90/server/libpq/auth.h /opt/local/include/postgresql90/server/libpq/be-fsstubs.h /opt/local/include/postgresql90/server/libpq/crypt.h /opt/local/include/postgresql90/server/libpq/hba.h /opt/local/include/postgresql90/server/libpq/ip.h /opt/local/include/postgresql90/server/libpq/libpq-be.h /opt/local/include/postgresql90/server/libpq/libpq-fs.h /opt/local/include/postgresql90/server/libpq/libpq.h /opt/local/include/postgresql90/server/libpq/md5.h /opt/local/include/postgresql90/server/libpq/pqcomm.h /opt/local/include/postgresql90/server/libpq/pqformat.h /opt/local/include/postgresql90/server/libpq/pqsignal.h /opt/local/lib/postgresql90/libpq.5.3.dylib /opt/local/lib/postgresql90/libpq.5.dylib /opt/local/lib/postgresql90/libpq.a /opt/local/lib/postgresql90/libpq.dylib /opt/local/lib/postgresql90/libpqwalreceiver.so /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/databases/libpqxx /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/databases/libpqxx/Portfile /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/databases/libpqxx26 /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/databases/libpqxx26/Portfile /usr/include/libpq /usr/include/libpq/libpq-fs.h /usr/include/libpq-events.h /usr/include/libpq-fe.h /usr/include/postgresql/internal/libpq /usr/include/postgresql/internal/libpq/pqcomm.h /usr/include/postgresql/internal/libpq-int.h /usr/include/postgresql/server/libpq /usr/include/postgresql/server/libpq/auth.h /usr/include/postgresql/server/libpq/be-fsstubs.h /usr/include/postgresql/server/libpq/crypt.h /usr/include/postgresql/server/libpq/hba.h /usr/include/postgresql/server/libpq/ip.h /usr/include/postgresql/server/libpq/libpq-be.h /usr/include/postgresql/server/libpq/libpq-fs.h /usr/include/postgresql/server/libpq/libpq.h /usr/include/postgresql/server/libpq/md5.h /usr/include/postgresql/server/libpq/pqcomm.h /usr/include/postgresql/server/libpq/pqformat.h /usr/include/postgresql/server/libpq/pqsignal.h /usr/lib/libpq.5.3.dylib /usr/lib/libpq.5.dylib /usr/lib/libpq.a /usr/lib/libpq.dylib How to tell pip to use this lib in /Library/PostgreSQL/9.1/lib/ (or may be in /usr/lib)? or may be install this lib again in my env (i try keep my env isolated from mac as possible)

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  • Getting started with Blocks and namespaces - Enterprise Library 5.0 Tutorial Part 2

    This is my second post in this series. In first blog post I explained how to install Enterprise Library 5.0 and provided links to various resources. Enterprise Library is divided into various blocks. Simply we can say, a block is a ready made solution for a particular common problem across various applications. So instead focusing on implementation of common problem across various applications, we can reuse these fully tested and extendable blocks to increase the productivity and also extendibility as these blocks are made with good design principles and patterns. Major blocks of Enterprise Library 5.0 are as follows.   Core infrastructure Functional Application Blocks Caching Data Exception Handling Logging Security Cryptography Validation Wiring Application Blocks Unity Policy Injection/Interception   Each block resides in its own assembly, and also some extra assemblies for common infrastructure. Assemblies are as follows. Microsoft.Practices.EnterpriseLibrary.Caching.Cryptography.dll Microsoft.Practices.EnterpriseLibrary.Caching.Database.dll Microsoft.Practices.EnterpriseLibrary.Caching.dll Microsoft.Practices.EnterpriseLibrary.Common.dll Microsoft.Practices.EnterpriseLibrary.Configuration.Design.HostAdapter.dll Microsoft.Practices.EnterpriseLibrary.Configuration.Design.HostAdapterV5.dll Microsoft.Practices.EnterpriseLibrary.Configuration.DesignTime.dll Microsoft.Practices.EnterpriseLibrary.Configuration.EnvironmentalOverrides.dll Microsoft.Practices.EnterpriseLibrary.Data.dll Microsoft.Practices.EnterpriseLibrary.Data.SqlCe.dll Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.dll Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Logging.dll Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.WCF.dll Microsoft.Practices.EnterpriseLibrary.Logging.Database.dll Microsoft.Practices.EnterpriseLibrary.Logging.dll Microsoft.Practices.EnterpriseLibrary.PolicyInjection.dll Microsoft.Practices.EnterpriseLibrary.Security.Cache.CachingStore.dll Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.dll Microsoft.Practices.EnterpriseLibrary.Security.dll Microsoft.Practices.EnterpriseLibrary.Validation.dll Microsoft.Practices.EnterpriseLibrary.Validation.Integration.AspNet.dll Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WCF.dll Microsoft.Practices.EnterpriseLibrary.Validation.Integration.WinForms.dll Microsoft.Practices.ServiceLocation.dll Microsoft.Practices.Unity.Configuration.dll Microsoft.Practices.Unity.dll Microsoft.Practices.Unity.Interception.dll Enterprise Library Configuration Tool In addition to these assemblies you would get configuration tool “EntLibConfig-32.exe”. If you are targeting your application to .NET 4.0 framework then you would need to use “EntLibConfig.NET4.exe”. Optionally you can install Visual Studio 2008 and Visual Studio 2010 add-ins whilst installing of Enterprise Library. So that you can invoke the enterprise Library configuration from Visual Studio by right clicking on “app.config” or “web.config” file as shown below. I would suggest you to download the documentation from Codeplex which was released on May 2010. It consists 3MB of information. you can also find issue tracker to know various issues/bugs currently people talking about enterprise library. There is also discussion link takes you to community site where you can post your questions. In my next blog post, I would cover more on each block. span.fullpost {display:none;}

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  • Manager/Container class vs static class methods

    - by Ben
    Suppose I a have a Widget class that is part of a framework used independently by many applications. I create Widget instances in many situations and their lifetimes vary. In addition to Widget's instance specified methods, I would like to be able to perform the follow class wide operations: Find a single Widget instance based on a unique id Iterate over the list of all Widgets Remove a widget from the set of all widgets In order support these operations, I have been considering two approaches: Container class - Create some container or manager class, WidgetContainer, which holds a list of all Widget instances, support iteration and provides methods for Widget addition, removal and lookup. For example in C#: public class WidgetContainer : IEnumerable<Widget { public void AddWidget(Widget); public Widget GetWidget(WidgetId id); public void RemoveWidget(WidgetId id); } Static class methods - Add static class methods to Widget. For example: public class Widget { public Widget(WidgetId id); public static Widget GetWidget(WidgetId id); public static void RemoveWidget(WidgetId id); public static IEnumerable<Widget AllWidgets(); } Using a container class has the added problem of how to access the container class. Make it a singleton?..yuck! Create some World object that provides access to all such container classes? I have seen many frameworks that use the container class approach, so what is the general consensus?

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  • class inheretence of a attribute which is itself a class

    - by alex
    i have a class which inherets a attribute from a super-class. this attribute is a class itself. class classA(superClass): def func(self,x): if self.attributeB is None: do somthing and in the other class i have class superClass: self.attributB = classB() i get the error AttributeError: class classA has no attribute 'attributeB' when i access the attribute like i showed but if on command line i can see it works, x = classA() x.attributeB is None True so the test works. whats going on in the above code?

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  • Using a database class in my user class

    - by Josh
    In my project I have a database class that I use to handle all the MySQL stuff. It connects to a database, runs queries, catches errors and closes the connection. Now I need to create a members area on my site, and I was going to build a users class that would handle registration, logging in, password/username changes/resets and logging out. In this users class I need to use MySQL for obvious reasons... which is what my database class was made for. But I'm confused as to how I would use my database class in my users class. Would I want to create a new database object for my user class and then have it close whenever a method in that class is finished? Or do I somehow make a 'global' database class that can be used throughout my entire script (if this is the case I need help with that, no idea what to do there.) Thanks for any feedback you can give me.

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  • Using a datanase class in my user class?

    - by Josh
    In my project I have a database class that I use to handle all the MySQL stuff. It connects to a database, runs queries, catches errors and closes the connection. Now I need to create a members area on my site, and I was going to build a users class that would handle registration, logging in, password/username changes/resets and logging out. In this users class I need to use MySQL for obvious reasons... which is what my database class was made for. But I'm confused as to how I would use my database class in my users class. Would I want to create a new database object for my user class and then have it close whenever a method in that class is finished? Or do I somehow make a 'global' database class that can be used throughout my entire script (if this is the case I need help with that, no idea what to do there.) Thanks for any feedback you can give me.

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  • Can i access outer class objects in inner class

    - by Shantanu Gupta
    I have three classes like this. class A { public class innerB { //Do something } public class innerC { //trying to access objB here directly or indirectly over here. //I dont have to create an object of innerB, but to access the object created by A //i.e. innerB objInnerB = objB; //not like this innerB objInnerB= new innerB(); } public innerB objB{get;set;} } I want to access the object of class B in Class C that is created by class A. Is it possible somehow to make changes on object of Class A in Class C. Can i get Class A's object by creating event or anyhow.

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  • Linking a template class using another template class (error LNK2001)

    - by Luís Guilherme
    I implemented the "Strategy" design pattern using an Abstract template class, and two subclasses. Goes like this: template <class T> class Neighbourhood { public: virtual void alter(std::vector<T>& array, int i1, int i2) = 0; }; and template <class T> class Swap : public Neighbourhood<T> { public: virtual void alter(std::vector<T>& array, int i1, int i2); }; There's another subclass, just like this one, and alter is implemented in the cpp file. Ok, fine! Now I declare another method, in another class (including neighbourhood header file, of course), like this: void lSearch(/*parameters*/, Neighbourhood<LotSolutionInformation> nhood); It compiles fine and cleanly. When starting to link, I get the following error: 1>SolverFV.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall lsc::Neighbourhood<class LotSolutionInformation>::alter(class std::vector<class LotSolutionInformation,class std::allocator<class LotSolutionInformation> > &,int,int)" (?alter@?$Neighbourhood@VLotSolutionInformation@@@lsc@@UAEXAAV?$vector@VLotSolutionInformation@@V?$allocator@VLotSolutionInformation@@@std@@@std@@HH@Z)

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  • Building a database class in PHP

    - by Sprottenwels
    I wonder if I should write a database class for my application, and if so, how to accomplish it? Over there on SO, a guy mentioned it should be written as an abstract class. However, I can't understand why this would be a benefit. Do I understand correctly, that if I would write an abstract class, every other class that methods will need a database connection, could simply extend this abstract class and have it's own database object? If so, how is this different from a "normal" class where I could instantiate an database object? Another method would be to completely forget about my own class and to instantiate a mysqli object on demand. What do you recommend?

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  • Class design for calling "the same method" on different classes from one place

    - by betatester07
    Let me introduce my situation: I have Java EE application and in one package, I want to have classes which will act primarily as cache for some data from database, for example: class that will hold all articles for our website class that will hold all categories etc. Every class should have some update() method, which will update data for that class from database and also some other methods for data manipulation specific for that data type. Now, I would like to call update() method for all class instances (there will be exactly one class instance for every class) from one place. What is the best design?

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  • How to easily substitute a Base class

    - by JTom
    Hi, I have the following hierarchy of classes class classOne { virtual void abstractMethod() = 0; }; class classTwo : public classOne { }; class classThree : public classTwo { }; All classOne, classTwo and classThree are abstract classes, and I have another class that is defining the pure virtual methods class classNonAbstract : public classThree { void abstractMethod(); // Couple of new methods void doIt(); void doItToo(); }; And right now I need it differently...I need it like class classNonAbstractOne : public classOne { void abstractMethod(); // Couple of new methods void doIt(); void doItToo(); }; class classNonAbstractTwo : public classTwo { void abstractMethod(); // Couple of new methods void doIt(); void doItToo(); }; and class classNonAbstractThree : public classThree { void abstractMethod(); // Couple of new methods void doIt(); void doItToo(); }; But all the nonAbstract classes have the same new methods, with the same code...and I would like to avoid copying all the methods and it's code to every nonAbstract class. How could I accomplish that? Hopefully it's understandable...

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  • Using a class within a class?

    - by Josh
    I built myself a MySQL class which I use in all my projects. I'm about to start a project that is heavily based on user accounts and I plan on building my own class for this aswell. The thing is, a lot of the methods in the user class will be MySQL queries and methods from the MySQL class. For example, I have a method in my user class to update someone's password: class user() { function updatePassword($usrName, $newPass) { $con = mysql_connect('db_host', 'db_user', 'db_pass'); $sql = "UPDATE users SET password = '$newPass' WHERE username = '$userName'"; $res = mysql_query($sql, $con); if($res) return true; mysql_close($con); } } (I kind of rushed this so excuse any syntax errors :) ) As you can see that would use MySQL to update a users password, but without using my MySQL class, is this correct? I see no way in which I can use my MySQL class within my users class without it seeming dirty. Do I just use it the normal way like $DB = new DB();? That would mean including my mysql.class.php somewhere too... I'm quite confused about this, so any help would be appreciated, thanks.

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  • Identifying that a variable is a new-style class in Python?

    - by Dave Johansen
    I'm using Python 2.x and I'm wondering if there's a way to tell if a variable is a new-style class? I know that if it's an old-style class that I can do the following to find out. import types class oldclass: pass def test(): o = oldclass() if type(o) is types.InstanceType: print 'Is old-style' else: print 'Is NOT old-style' But I haven't been able to find anything that works for new-style classes. I found this question, but the proposed solutions don't seem to work as expected, because simple values as are identified as classes. import inspect def newclass(object): pass def test(): n = newclass() if inspect.isclass(n): print 'Is class' else: print 'Is NOT class' if inspect.isclass(type(n)): print 'Is class' else: print 'Is NOT class' if inspect.isclass(type(1)): print 'Is class' else: print 'Is NOT class' if isinstance(n, object): print 'Is class' else: print 'Is NOT class' if isinstance(1, object): print 'Is class' else: print 'Is NOT class' So is there anyway to do something like this? Or is everything in Python just a class and there's no way to get around that?

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  • How to get a Class literal from a generically specific Class

    - by h2g2java
    There are methods like these which require Class literals as argument. Collection<EmpInfo> emps = SomeSqlUtil.select( EmpInfo.class, "select * from emps"); or GWT.create(Razmataz.class); The problem presents itself when I need to supply generic specific classes like EmpInfo<String> Razmataz<Integer> The following would be wrong syntax Collection<EmpInfo<String>> emps = SomeSqlUtil.select( EmpInfo<String>.class, "select * from emps"); or GWT.create(Razmataz<Integer>.class); Because you cannot do syntax like Razmataz<Integer>.class So, how would I be able to squeeze a class literal out of EmpInfo<String> Razmataz<Integer> so that I could feed them as arguments to methods requiring Class literals? Further info Okay, I confess that I am asking this primarily for GWT. I have a pair of GWT RPC interface Razmataz. (FYI, GWT RPC interface has to be defined in server-client pairs). I plan to use the same interface pair for communicating whether it be String, Integer, Boolean, etc. GWT.create(Razmataz) for Razmataz<T> complains that, since I did not specify T, GWT compiler treated it as Object. Then GWT compiler would not accept Object class. It needs to be more specific than being an Object. So, it seems there is no way for me to tell GWT.create what T is because a Class literal is a runtime concept while generics is a compile time concept, Right?

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  • Getting the class of an n dimensional array of an runtime supplied class name

    - by MeBigFatGuy
    Given a fully qualified class name, and a number of dimensions, i would like to get the Class name for this class. I believe i can do this like such public Class<?> getArrayClass(String className, int dimensions) throws ClassNotFoundException { Class<?> elementType = Class.forName(className); return Array.newInstance(elementType, new int[dimensions]).getClass(); } However this requires me to create an unneeded instance of the class. Is there a way to do this without creating the instance? It does not appear that Class.forName("[[[[Ljava/lang/String;") (or a algorithmically generated version) works correctly in all instances from various blog posts i've seen.

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  • Returning and instance of a Class given its .class (MyClass.class)

    - by jax
    I have an enum that will hold my algorithms. I cannot instantiate these classes because I need the application context which is only available once the application has started. I want to load the class at runtime when I choose by calling getAlgorithm(Context cnx). How do I easily instantiate a class at runtime given its .class (and my constructor takes arguments)? All my classes are subclasses of Algorithm. public enum AlgorithmTypes { ALL_FROM_9_AND_LAST_FROM_10_ID(AlgorithmFactory.AlgorithmAllFrom9AndLastFrom10Impl.class), ALL_FROM_9_AND_LAST_FROM_10_CURRENCY_ID(AlgorithmFactory.AlgorithmAllFrom9AndLastFrom10Impl.class), DIVIDE_BY_9_LESS_THAN_100(AlgorithmFactory.AlgorithmAllFrom9AndLastFrom10Impl.class), TABLES_BEYOND_5_BY_5(AlgorithmFactory.AlgorithmAllFrom9AndLastFrom10Impl.class); private Class<? extends Algorithm> algorithm; AlgorithmTypes(Class<? extends Algorithm> c) { algorithm = c; } public Algorithm getAlgorithm(Context cnx) { return //needs to return the current algoriths constructor which takes the Context Algorithm(Context cnx); } }

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  • How to add class to selective <li> in a generated menu

    - by Vikram
    Hi I am looking for a solution to add a class to every list item <li> which has a child item with a class of <span class="separator"> and a different class to <li> with an anchor link. I use Joomla and the menu is being generated somewhat like this: <ul class="menu"> <li class="item1"><a href="<!-- link goes here -->"><span>Home</span></a></li> <li class="parent item59"><span class="separator"><span>Demo</span></span></li> <li class="item62"><a href="<!-- link goes here -->"><span>Article</span></a></li> <li id="current" class="parent active item27"><a href="<!-- link goes here -->"><span>CMS</span></a> <ul> <li class="item50"><a href="<!-- link goes here -->"><span>The News</span></a></li> <li class="item48"><a href="<!-- link goes here -->"><span>Web Links</span></a></li> <li class="item65"><span class="separator"><span /></span></li> <li class="item49"><a href="<!-- link goes here -->"><span>News Feeds</span></a></li> <li class="item66"><span class="separator"><span /></span></li> <li class="item67"><span class="separator"><span /></span></li> <li class="item68"><span class="separator"><span /></span></li> </ul> </li> <li class="item71"><span class="separator"><span>Help</span></span></li> </ul> What I want is to add class "anclink" or "seplink" to the <li> depending on their child item so that the final output looks like below. <ul class="menu"> <li class="item1 anclink"><a href="<!-- link goes here -->"><span>Home</span></a></li> <li class="parent item59 seplink"><span class="separator"><span>Demo</span></span></li> <li class="item62 anclink"><a href="<!-- link goes here -->"><span>Article</span></a></li> <li id="current" class="parent active item27" anclink><a href="<!-- link goes here -->"><span>CMS</span></a> <ul> <li class="item50 anclink"><a href="<!-- link goes here -->"><span>The News</span></a></li> <li class="item48 anclink"><a href="<!-- link goes here -->"><span>Web Links</span></a></li> <li class="item65 seplink"><span class="separator"><span /></span></li> <li class="item49 anclink"><a href="<!-- link goes here -->"><span>News Feeds</span></a></li> <li class="item66 seplink"><span class="separator"><span /></span></li> <li class="item67 seplink"><span class="separator"><span /></span></li> <li class="item68 seplink"><span class="separator"><span /></span></li> </ul> </li> <li class="item71 seplink"><span class="separator"><span>Help</span></span></li> </ul> How can I achieve this using PHP or even a jQuery solution will be fine. Kindly help.

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  • Subclassing to avoid line length

    - by Super User
    The standard line length of code is 80 characters per line. This is accepted and followed by the most of programmers. I working on a state machine of a character and is necessary for me follow this too. I have four classes who pass this limit. I can subclass each class in two more and then avoid the line length limit. class Stand class Walk class Punch class Crouch The new classes would be StandLeft, StandRight and so on. Stand, Walk, Punch and Crouch would be then abstract classes. The question if there is a limit for the long of the hierarchies tree or this is depends of the case.

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  • Help finding good players that would display music library as folder structure

    - by cipricus
    I have a big music library. Nothing special here. But I very much dislike the way usually music library is displayed in most recommended players, according to Artist/Album/Year/Genre tags, ignoring my folder structure or making it hardly accessible. The problem is that not all my music is tagged according to genre etc, but all is perfectly ordered by folder structure which takes into account all characteristics handled by tags, as well as many others, which I can change and specify at any time. (I can decide ordering my music by country, inside a sub-category like "baroque music", for example). The advantage of using folder structure in displaying media library is that all the logical structure is displayed, with all sub-categories, which can vary and be changed, visible at the same time. Some Players, like Clementine and Quod Libet, can display folders, but when comes to displaying only the library, they still display it only by tags. I am looking for some plugins to good players that would provide a solution to this, and I am looking for different solutions to this. Therefore I'll display as my own answer some solutions that I have already found and welcome other answers with new and better ways to achieve the same purpose. (Most welcome are of course players that, beside having the capability discussed here, would include other elementary features like playlists in tabs, search, and so forth.)

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  • How to load a library that depends on another library, all from a jar file

    - by Philip
    I would like to ship my application as a self-contained jar file. The jar file should contain all the class files, as well as two shared libraries. One of these shared libraries is written for the JNI and is essentially an indirection to the other one (which is 100% C). I have first tried running my jar file without the libraries, but having them accessible through the LD_LIBRARY_PATH environment variable. That worked fine. I then put the JNI library into the jar file. I have read about loading libraries from jar files by copying them first to some temporary directory, and that worked well for me (note that the 100% C library was, I suppose, loaded as before). Now I want to put both libraries into the jar, but I don't understand how I can make sure that they will both be loaded. Sure I can copy them both to a temporary directory, but when I load the "indirection" one, it always gives me: java.lang.UnsatisfiedLinkError: /tmp/.../libindirect.so: /libpure.so: cannot open shared object file: No such file or directory I've tried to force the JVM to load the "100% C" library first by explicitely calling System.load(...) on its temporary file, but that didn't work better. I suspect the system is looking for it when resolving the links in libindirect.so but doesn't care about what the JVM loaded. Can anyone help me on that one? Thanks

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  • c++ defining a static member of a template class with type inner class pointer

    - by Jack
    I have a template class like here (in a header) with a inner class and a static member of type pointer to inner class template <class t> class outer { class inner { int a; }; static inner *m; }; template <class t> outer <t>::inner *outer <t>::m; when i want to define that static member i says "error: expected constructor, destructor, or type conversion before '*' token" on the last line (mingw32-g++ 3.4.5)

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  • Class.Class vs Namespace.Class for top level general use class libraries?

    - by Joan Venge
    Which one is more acceptable (best-practice)?: namespace NP public static class IO public static class Xml ... // extension methods using NP; IO.GetAvailableResources (); vs public static class NP public static class IO public static class Xml ... // extension methods NP.IO.GetAvailableResources (); Also for #2, the code size is managed by having partial classes so each nested class can be in a separate file, same for extension methods (except that there is no nested class for them) I prefer #2, for a couple of reasons like being able to use type names that are already commonly used, like IO, that I don't want to replace or collide. Which one do you prefer? Any pros and cons for each? What's the best practice for this case? EDIT: Also would there be a performance difference between the two?

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  • Soapi.CS : A fully relational fluent .NET Stack Exchange API client library

    - by Sky Sanders
    Soapi.CS for .Net / Silverlight / Windows Phone 7 / Mono as easy as breathing...: var context = new ApiContext(apiKey).Initialize(false); Question thisPost = context.Official .StackApps .Questions.ById(386) .WithComments(true) .First(); Console.WriteLine(thisPost.Title); thisPost .Owner .Questions .PageSize(5) .Sort(PostSort.Votes) .ToList() .ForEach(q=> { Console.WriteLine("\t" + q.Score + "\t" + q.Title); q.Timeline.ToList().ForEach(t=> Console.WriteLine("\t\t" + t.TimelineType + "\t" + t.Owner.DisplayName)); Console.WriteLine(); }); // if you can think it, you can get it. Output Soapi.CS : A fully relational fluent .NET Stack Exchange API client library 21 Soapi.CS : A fully relational fluent .NET Stack Exchange API client library Revision code poet Revision code poet Votes code poet Votes code poet Revision code poet Revision code poet Revision code poet Votes code poet Votes code poet Votes code poet Revision code poet Revision code poet Revision code poet Revision code poet Revision code poet Revision code poet Revision code poet Revision code poet Revision code poet Revision code poet Votes code poet Comment code poet Revision code poet Votes code poet Revision code poet Revision code poet Revision code poet Answer code poet Revision code poet Revision code poet 14 SOAPI-WATCH: A realtime service that notifies subscribers via twitter when the API changes in any way. Votes code poet Revision code poet Votes code poet Comment code poet Comment code poet Comment code poet Votes lfoust Votes code poet Comment code poet Comment code poet Comment code poet Comment code poet Revision code poet Comment lfoust Votes code poet Revision code poet Votes code poet Votes lfoust Votes code poet Revision code poet Comment Dave DeLong Revision code poet Revision code poet Votes code poet Comment lfoust Comment Dave DeLong Comment lfoust Comment lfoust Comment Dave DeLong Revision code poet 11 SOAPI-EXPLORE: Self-updating single page JavaSript API test harness Votes code poet Votes code poet Votes code poet Votes code poet Votes code poet Comment code poet Revision code poet Votes code poet Revision code poet Revision code poet Revision code poet Comment code poet Revision code poet Votes code poet Comment code poet Question code poet Votes code poet 11 Soapi.JS V1.0: fluent JavaScript wrapper for the StackOverflow API Comment George Edison Comment George Edison Comment George Edison Comment George Edison Comment George Edison Comment George Edison Answer George Edison Votes code poet Votes code poet Votes code poet Votes code poet Revision code poet Revision code poet Answer code poet Comment code poet Revision code poet Comment code poet Comment code poet Comment code poet Revision code poet Revision code poet Votes code poet Votes code poet Votes code poet Votes code poet Comment code poet Comment code poet Comment code poet Comment code poet Comment code poet 9 SOAPI-DIFF: Your app broke? Check SOAPI-DIFF to find out what changed in the API Votes code poet Revision code poet Comment Dennis Williamson Answer Dennis Williamson Votes code poet Votes Dennis Williamson Comment code poet Question code poet Votes code poet About A robust, fully relational, easy to use, strongly typed, end-to-end StackOverflow API Client Library. Out of the box, Soapi provides you with a robust client library that abstracts away most all of the messy details of consuming the API and lets you concentrate on implementing your ideas. A few features include: A fully relational model of the API data set exposed via a fully 'dot navigable' IEnumerable (LINQ) implementation. Simply tell Soapi what you want and it will get it for you. e.g. "On my first question, from the author of the first comment, get the first page of comments by that person on any post" my.Questions.First().Comments.First().Owner.Comments.ToList(); (yes this is a real expression that returns the data as expressed!) Full coverage of the API, all routes and all parameters with an intuitive syntax. Strongly typed Domain Data Objects for all API data structures. Eager and Lazy Loading of 'stub' objects. Eager\Lazy loading may be disabled. When finer grained control of requests is desired, the core RouteMap objects may be leveraged to request data from any of the API paths using all available parameters as documented on the help pages. A rich Asynchronous implementation. A configurable request cache to reduce unnecessary network traffic and to simplify your usage logic. There is no need to go out of your way to be frugal. You may set a distinct cache duration for any particular route. A configurable request throttle to ensure compliance with the api terms of usage and to simplify your code in that you do not have to worry about and respond to 50X errors. The RequestCache and Throttled Queue are thread-safe, so can make as many requests as you like from as many threads as you like as fast as you like and not worry about abusing the api or having to write reams of management/compensation code. Configurable retry threshold that will, by default, make up to 3 attempts to retrieve a request before failing. Every request made by Soapi is properly formed and directed so most any http error will be the result of a timeout or other network infrastructure. A retry buffer provides a level of fault tolerance that you can rely on. An almost identical javascript library, Soapi.JS, and it's full figured big brother, Soapi.JS2, that will enable you to leverage your server cycles and bandwidth for only those tasks that require it and offload things like status updates to the client's browser. License Licensed GPL Version 2 license. Why is Soapi.CS GPL? Can I get an LGPL license for Soapi.CS? (hint: probably) Platforms .NET 3.5 .NET 4.0 Silverlight 3 Silverlight 4 Windows Phone 7 Mono Download Source code lives @ http://soapics.codeplex.com. Binary releases are forthcoming. codeplex is acting up again. get the source and binaries @ http://bitbucket.org/bitpusher/soapi.cs/downloads The source is C# 3.5. and includes projects and solutions for the following IDEs Visual Studio 2008 Visual Studio 2010 ModoDevelop 2.4 Documentation Full documentation is available at http://soapi.info/help/cs/index.aspx Sample Code / Usage Examples Sample code and usage examples will be added as answers to this question. Full API Coverage all API routes are covered Full Parameter Parity If the API exposes it, Soapi giftwraps it for you. Building a simple app with Soapi.CS - a simple app that gathers all traces of a user in the whole stackiverse. Fluent Configuration - Setting up a Soapi.ApiContext could not be easier Bulk Data Import - A tiny app that quickly loads a SQLite data file with all users in the stackiverse. Paged Results - Soapi.CS transparently handles multi-page operations. Asynchronous Requests - Soapi.CS provides a rich asynchronous model that is especially useful when writing api apps in Silverlight or Windows Phone 7. Caching and Throttling - how and why Apps that use Soapi.CS Soapi.FindUser - .net utility for locating a user anywhere in the stackiverse Soapi.Explore - The entire API at your command Soapi.LastSeen - List users by last access time Add your app/site here - I know you are out there ;-) if you are not comfortable editing this post, simply add a comment and I will add it. The CS/SL/WP7/MONO libraries all compile the same code and with the exception of environmental considerations of Silverlight, the code samples are valid for all libraries. You may also find guidance in the test suites. More information on the SOAPI eco-system. Contact This library is currently the effort of me, Sky Sanders (code poet) and can be reached at gmail - sky.sanders Any who are interested in improving this library are welcome. Support Soapi You can help support this project by voting for Soapi's Open Source Ad post For more information about the origins of Soapi.CS and the rest of the Soapi eco-system see What is Soapi and why should I care?

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