Just choose **Extract Interface...** from the `Refactor` menu.  

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/8ELeP.png

### Quickie-Question:
To summarize, I&#39;m a little confused as to how I would design such a database that allows indefinite badge-rule creation without requiring structural changes to the previously existing user-tables in the database.

Storing Badge Title, Criteria, etc. What would that Table look like?

- badge_id (1)
- badge_title (10K Badge)
- badge_image (10k.jpg)
- badge_criteria ([posts] &gt;= 10000)&lt;br/&gt;
`...`


### Winded-Question:
I would like to implement a badge-system on my own personal projects, but am seeking a bit of advice as to how one would best do such a thing. I&#39;ve been reading some of the questions here about badge-systems, but don&#39;t see the database-architecture getting much attention.

Badges that are based on user-points (Hypothetical &quot;10k Badge&quot;) would seem pretty straight forward. Any event that affects the users reputation (upvotes, downvotes, answer-accepted, etc) would invoke a method to review the users new reputation, and potentially award a badge.

That system sounds pretty straight forward, but what does that look like as a database for the administrator who wants to create innumerable amounts of badges with little-effort down the road - some of which may be based on different criteria, and not simply the user reputation.

User-reputation is likely a value within the user-record itself. But ideally, wouldn&#39;t you want to avoid having to add new fields to the user table when you create new badges? For instance the &quot;Edited 100 Entries&quot; badge - you wouldn&#39;t create a new column &quot;entries_edited&quot; within the Users Table, would you? And then increment that after each entry-edited...

Any hints?

Stackoverflow Archive:

- [Best way to Store Badge Criteria][1] **(Not a duplicate)**
- [Designing a Badge System: Where to fire business-logic?][2]

---

*Note: I&#39;m NOT asking how to associate badges with users. I&#39;m NOT asking how to award badges (that will be done programmatically)* 

  [1]: https://stackoverflow.com/questions/522943/best-way-to-store-badge-criteria
  [2]: https://stackoverflow.com/questions/314412/designing-a-badge-system-where-to-fire-business-logic-in-code-or-stored-procedu

Database Architecture for &quot;Badge&quot; System &amp; Arbitrary Criteria (MySQL/PHP)

I have a very simple python script that **should** scan a text file, which contains lines formatted as *id*=&#39;*value*&#39; and put them into a dict. the python module is called chval.py and the input file is in.txt. here&#39;s the code:

    import os,sys
    from os import *
    from sys import *
    
    vals = {}
    
    f = open(sys.argv[1], &#39;r&#39;)
    
    for line in val_f:
    	t = line.split(&#39;=&#39;)
    	t[1].strip(&#39;\&#39;&#39;)
    	vals.append(t[0], t[1])
    
    print vals
    
    f.close()

when i try to run it i get:

&gt; Traceback (most recent call last):  
&gt; File &quot;chval.py&quot;, line 9, in ?
&gt;     f = open(sys.argv[1], &#39;r&#39;) TypeError: an integer is required

I&#39;m using python 2.4... because i&#39;ve been challenged to not use anything newer, is there something about open() that I don&#39;t know about? Why does it want an integer?

anything after that line is untested. in short: why is it giving me the error and how do i fix it?


An integer is required? open()

Is there any plugin in `Eclipse` that auto generates `interface` based on solid class/impl concrete `class`?  
Currently I hand code interfaces.

Generate interface from solid class file in Eclipse

<p>Is there any plugin in <code>Eclipse</code> that auto generates <code>interface</code> based on solid class/impl concrete <code>class</code>?<br>
Currently I hand code interfaces.</p>


Well, hopefully the question is self-explanatory.

It&#39;s so easy to select a block of code and tab out, but how about the reverse?

Currently, I just search &amp; replace for whitespace at the beginning of the line. Anything faster?

Keyboard shortcut to &quot;untab&quot; (move a block of code to the left) in eclipse / aptana?

When trying to start my JUnit-Test out of Eclipse, I get a &quot;ClassNotFoundException&quot;. When running &quot;mvn test&quot; from console - everything works fine. Also, there are no problems reported in Eclipse.

My project structure is the following:

 - parent project (pom-packaging)
  - Web project (war-packaging - my JUnit-test is in here)
  - Flex project
  - Configuration project


----------

edit: How can the class not be found? It&#39;s a simple HelloWorld-Application with no special libraries.

Here&#39;s my JUnit&#39;s run-configuration:
![alt text][1]


  [1]: http://www.walkner.biz/_temp/runconfig.png


----------

Testclass (but as I said; it doesn&#39;t work with a simple HelloWorld either...):

    import org.junit.After;
    import org.junit.Assert;
    import org.junit.Before;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    import biz.prognoserechnung.domain.User;
    import biz.prognoserechnung.domain.UserRepository;
    import biz.prognoserechnung.domain.hibernate.UserHibernateDao;

    public class UserDaoTest {
    /**
     * the applicationcontext.
     */
    private ApplicationContext ctx = null;

    /**
     * the user itself.
     */
    private User record = null;

    /**
     * Interface for the user.
     */
    private UserRepository dao = null;

    @Before
    public void setUp() throws Exception {
	String[] paths = { &quot;WEB-INF/applicationContext.xml&quot; };
	ctx = new ClassPathXmlApplicationContext(paths);
	dao = (UserHibernateDao) ctx.getBean(&quot;userRepository&quot;);
    }

    @After
    public void tearDown() throws Exception {
	dao = null;
    }

    @Test
    public final void testIsUser() throws Exception {
	Assert.assertTrue(dao.isUser(&quot;John&quot;, &quot;Doe&quot;));
    }

    @Test
        public final void testIsNoUser() throws Exception {
    	Assert.assertFalse(dao.isUser(&quot;not&quot;, &quot;existing&quot;));
            Assert.assertFalse(dao.isUser(null, null));
            Assert.assertFalse(dao.isUser(&quot;&quot;, &quot;&quot;));
        }
    }



Eclipse - java.lang.ClassNotFoundException

News wrote that Eclipse 3.5 finally supports column selection. 
Unfortunately I don&#39;t know HOW to enable it. I tried pressing the ALT-key like I am used to in Visual Studio and all other Microsoft products but that had no effect. 

How can I mark a vertical block in Eclipse? 


How do I enable the column selection mode in Eclipse?

I have an Eclipse project where I want to keep my Java project built into a JAR automatically. I know I have an option to export the project into a JAR; if I do a right click; but what I am really looking for is, that like Eclipse automatically builds a project&#39;s `.class` files and put them in target folder; it should also build a JAR automatically and copy the latest JAR at some or a specific location.

Is there a option to configure Eclipse in such a way, to build JARs automatically? 

Just to make it clear for guys, patient enough to answer my question; I am not looking at ANT as solution; as I already use it, but what I would like it something that gets initiated automatically either with a time based trigger or immediate build with change.

Build project into a JAR automatically in Eclipse

I&#39;m new to Eclipse. I&#39;m using subclipse for connecting to my SVN.  There are some folders and files I would like to add to svn:ignore, but it&#39;s grayed out.  Is there an easy way to get subclipse to ignore files and directories? 

![subclipse][1]


  [1]: https://i.stack.imgur.com/i2xoH.png

Subclipse svn:ignore

    Class someInterface = Class.fromName(&quot;some.package.SomeInterface&quot;);

How do I now create a new class that implements `someInterface`?

I need to create a new class, and pass it to a function that needs a `SomeInterface` as an argument.

Java Reflection: Create an implementing class

Is there a way to get the following function declaration?

    public bool Foo&lt;T&gt;() where T : interface;

ie. where T is an interface type (similar to `where T : class`, and `struct`).

Currently I&#39;ve settled for:

    public bool Foo&lt;T&gt;() where T : IBase;

Where IBase is defined as an empty interface that is inherited by all my custom interfaces... Not ideal, but it should work... Why can&#39;t you define that a generic type must be an interface?

For what it&#39;s worth, I want this because `Foo` is doing reflection where it needs an interface type... I could pass it in as a normal parameter and do the necessary checking in the function itself, but this seemed a lot more typesafe (and I suppose a little more performant, since all the checks are done at compiletime).

How can I use interface as a C# generic type constraint?

To cut a long story short I have a C# function that performs a task on a given Type that is passed in as an Object instance. All works fine when a class instance is passed in. However, when the object is declared as an interface I&#39;d really like to find the concrete class and perform the action upon that class type.

Here is the ubiquitous bad example (resplendent with incorrect property casing etc):

    public interface IA
    {
        int a { get; set; }
    }
    public class B : IA
    {
        public int a { get; set; }
        public int b { get; set; }
    }
    public class C : IA
    {
        public int a { get; set; }
        public int c { get; set; }
    }

    // snip

    IA myBObject = new B();
    PerformAction(myBObject);

    IA myCObject = new C();
    PerformAction(myCObject);

    // snip

    void PerformAction(object myObject)
    {
        Type objectType = myObject.GetType();   // Here is where I get typeof(IA)
        if ( objectType.IsInterface )
        {
            // I want to determine the actual Concrete Type, i.e. either B or C
            // objectType = DetermineConcreteType(objectType);
        }
        // snip - other actions on objectType
    }


I&#39;d like the code in PerformAction to use Reflection against it&#39;s parameter and see that it&#39;s not just an instance of IA but that it&#39;s an instance of B and to see the property &quot;b&quot; via GetProperties(). If I use .GetType() I get the Type of IA - not what I want.

How can PerformAction determine the underlying Concrete Type of the instance of IA?

Some might be tempted to suggest using an Abstract class but that is just the limitation of my bad example. The variable will be originally declared as an interface instance.

Finding the Concrete Type behind an Interface instance

I have method in Class which is implementation of Interface. When I made it Explicit implementation I got compiler error

    The modifier &#39;public&#39; is not valid for this item

Why it is not allowed to have `public` for explicit interface implementation ?

Why Explicit Implementation of a Interface can not be public?

&gt; **Possible Duplicate:**  
&gt; [Why Doesn&amp;rsquo;t C# Allow Static Methods to Implement an Interface?](https://stackoverflow.com/questions/259026/why-doesnt-c-allow-static-methods-to-implement-an-interface)  


In my application I want to use a Repository that will do the raw data access (`TestRepository`, `SqlRepository`, `FlatFileRepository` etc).
Because such a repository would be used throughout the runtime of my application it seemed like a sensible thing to me to make it a static class so I could go

    SqlRepository.GetTheThingById(5);

without it having to be regenerated all the time.
Because I want my repositories to be interchangeable, I want them to implement a common interface: `IRepository`.
But when I try to do so, I get:
    
&gt; Static classes cannot implement interfaces

Why can&#39;t they?
How do you suggest I change my design then? Is there a pattern I could use?

**UPDATE**  
Five years later: this question is visited 20k+ times, I learned about the disadvantages of the repository pattern, learned about IoC and realise my question was poorly formulated. 
 
I wasn&#39;t really asking what the C# specification of an interface is, rather why it was deliberately restricting me in this specific way.  

The practical answer is that the syntax for calling a method on an instance or on a type are different. But the question is closed.



Why static classes cant implement interfaces?

I have a specific project where I need to wrap every code line at 65 characters. I have set up the eclipse Java code formatter properly for this. But what I really want is a vertical line to be drawn in the editor showing where the max line width while I am typing, not just when I run the formmater. I know this feature is available in some capacity because it is displayed in the code formatter property page.


I don&#39;t see any option in eclipse to turn this on and I didn&#39;t see any plug-ins that do it on Eclipse Plugin Central

Is there an Eclipse line-width marker?

I have a big problem. Eclipse is hanging up when I do any copy/paste with &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;C&lt;/kbd&gt; / &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;V&lt;/kbd&gt; keys.

Is it due to the Eclipse validation code system?

Do I mess something in my Eclipse setting?

Here is my conf :

 - Eclipse 3.4.2
 - Plugin RSE
 - Windows XP pro Service Pack 2
 - Java VM version = 1.5.0_11-b03
 

Eclipse hang when copying / pasting code

Do you know of any Eclipse plugin to run a system shell in the included console?
It would be awesome. Dolphin, KDE&#39;s file navigator, has this feature, you can press F4 and a console shows located on the directory you are standing.

It would be awesome to have a similar feature on Eclipse, with the shell located on the directory of the project/file you are working on. 

Does this plugin exist?

If not, would it be too complicated to code such a plugin? I have no idea about eclipse plugin development (yet).

Is there an Eclipse plugin to run system shell in the Console?

Where can I find a good Eclipse Mercurial Plugin?

Mercurial Eclipse Plugin

I was looking for a small plugin for Eclipse that would allow to open windows explorer on currently selected resource from Package Explorer tree.

I know that Aptana Studio provides this functionality via context menu on the resource, but it has tons of other stuff that I am not interested to. 

Are there other solutions?


  [1]: http://www.eclipsezone.com/eclipse/forums/t77655.html

How to open windows explorer on selected resource in Eclipse

I&#39;m setting up a C++ project, on Ubuntu x64, using Eclipse-CDT.  I&#39;m basically doing a hello world and linking to a commerical 3rd party library.

I&#39;ve included the header files, linked to their libraries, but I still get linker errors.  Are there some possible problems here other than the obvious (e.g. I am 99% sure I&#39;m linking to the correct library).

 1. Is there a way to confirm the static libraries I am linking to are 64bit?
 2. Is there a way to confirm that the library has the class (and methods) I am expecting it to have?

Eclipse says:

&lt;pre&gt;
Building target: LinkProblem
Invoking: GCC C++ Linker
g++ -L/home/notroot/workspace/somelib-3/somelib/target/bin -o&quot;LinkProblem&quot;  ./src/LinkProblem.o   -lsomelib1 -lpthread -lsomelib2 -lsomelib3
./src/LinkProblem.o: In function `main&#39;:
/home/notroot/workspace/LinkProblem/Debug/../src/LinkProblem.cpp:17: undefined reference to `SomeClass::close()&#39;
./src/LinkProblem.o: In function `SomeOtherClass&#39;:
/home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:148: undefined reference to `SomeClass::SomeClass()&#39;
/home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:148: undefined reference to `vtable for SomeOtherClass&#39;
/home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:151: undefined reference to `SomeClass::~SomeClass()&#39;
./src/LinkProblem.o: In function `~SomeOtherClass&#39;:
/home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:140: undefined reference to `vtable for SomeOtherClass&#39;
/home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:140: undefined reference to `SomeClass::~SomeClass()&#39;
/home/notroot/workspace/somelib-3/somelib/include/sql/somefile.h:140: undefined reference to `SomeClass::~SomeClass()&#39;
collect2: ld returned 1 exit status
make: *** [LinkProblem] Error 1
&lt;/pre&gt;

GCC C++ Linker errors: Undefined reference to &#39;vtable for XXX&#39;, Undefined reference to &#39;ClassName::ClassName()&#39;

I would like to make a cheat sheet presenting the most useful (and time saving) shortcut for Eclipse CDT (C++). 

Can you share what are the most useful shortcuts that you use in CDT?

Please, post only general shortcuts (available when doing C++) or CDT specific.


Most useful shortcut in Eclipse CDT

I have the eclipse CDT installed, and I would like to install Java development functionality (JDT) on top of my CDT installation. I&#39;ve been Googling from an hour but I can&#39;t figure out how to do this. 

What plugin do I need to install? What update site do I need to use?

Install Eclipse JDT on top of CDT

I&#39;m using Eclipse with C++ code via linked resources on Linux. The code analysis index seems to be corrupted (Goto definition lands the cursor close to, but not on, the definition) Refreshing resources doesn&#39;t fix it, neither does restarting Eclipse.

Is there a way to flush the index and rebuild it?

Clean Eclipse Index, it is out of sync with code

Using Eclipse and CDT to debug C++ code the variable windows is cumbersome and not very informative for types defined in the standard template library or in boost (e.g. shared_ptr).

Just an example how this may look like for an std::vector:

    bar	{…}
    	std::_Vector_base&lt;TSample&lt;MyTraits&gt;, std::allocator&lt;TSample&lt;MyTraits&gt; &gt; &gt;	
    		_M_impl	{…}	
    			std::allocator&lt;TSample&lt;MyTraits&gt; &gt;	{…}	
    			_M_start	0x00007ffff7fb5010	
    			_M_finish	0x00007ffff7fd4410	
    			_M_end_of_storage	0x00007ffff7fd5010	

Even if this information about the internals of those types may be useful, in almost any cases I would expect a clearer presentation here, i.e. a list of values for the std::vector. Are there any tools, plugins or other modifications around which can do this?

**EDIT**

The following solutions does not work for linux. I am using ubuntu 14.04, eclipse, g++, gdb.

I cant find a package gdb-python and linux does not use mingw

Content Type	Original Author	Original Content on Stackoverflow
Question	cometta	View Question on Stackoverflow
Solution 1 - Eclipse	Carl Manaster	View Answer on Stackoverflow

Generate interface from solid class file in Eclipse

Eclipse Problem Overview

Eclipse Solutions

Solution 1 - Eclipse

An integer is required? open()

Database Architecture for "Badge" System & Arbitrary Criteria (MySQL/PHP)

Attributions