Android - Sample Factory

gistfile1.txt

public final class SampleFactory {
    private static final Constructor<?> _CONSTRUCTOR;
    private static final String _DEFAULT_IMPLEMENTION = "com.example.vincent.customImpl";
    
    static {
        Class<?> clazz = null;
        String impl = System.getProperty(_DEFAULT_IMPLEMENTION);
        if(impl != null){
            try{
                clazz = Class.forName(impl);
            }catch(ClassNotFoundException ignore){
          
            }
        }
        
        if(null == clazz){
          try{
            clazz = Class.forName("com.example.vincent.customImpl");
          }catch(ClassNotFoundException e){
            throw new AssertionError(e);
          }
        }
        
        try{
          _CONSTRUCTOR = clazz.getCounstructor(CustomConfiguration.class);
        }catch(NoSuchMethodException e){
          throw new AssertionError(e);
        }
    }
}