public static FactoryConfiguration getFromClass()

in velocity-tools-generic/src/main/java/org/apache/velocity/tools/config/ConfigurationUtils.java [380:436]
49 lines of code
8 McCabe index (conditional complexity)

    public static FactoryConfiguration getFromClass(Class factory)
    {
        //TODO: look for a getConfiguration() method
        Method getConf = null;
        try
        {
            // check for a public setup(Map) method first
            getConf = factory.getMethod(CONFIG_FACTORY_METHOD, (Class[])null);
        }
        catch (NoSuchMethodException nsme)
        {
            throw new IllegalArgumentException("Could not find "+CONFIG_FACTORY_METHOD+" in class "+factory.getName(), nsme);
        }

        // get an instance if the method is not static
        Object instance = null;
        if (!Modifier.isStatic(getConf.getModifiers()))
        {
            try
            {
                instance = factory.newInstance();
            }
            catch (Exception e)
            {
                throw new IllegalArgumentException(factory.getName()+" must have usable default constructor or else "+CONFIG_FACTORY_METHOD+" must be declared static", e);
            }
        }

        // invoke the method
        try
        {
            FactoryConfiguration result =
                (FactoryConfiguration)getConf.invoke(instance, (Object[])null);
            if (result == null)
            {
                throw new IllegalArgumentException("Method "+CONFIG_FACTORY_METHOD+" in class "+factory.getName()+" should not return null or void");
            }
            else
            {
                return result;
            }
        }
        catch (IllegalAccessException iae)
        {
            throw new IllegalArgumentException("Failed to invoke "+CONFIG_FACTORY_METHOD+" in class "+factory.getName(), iae);
        }
        catch (IllegalArgumentException iae)
        {
            // if this happens, it's more a problem w/this code than the users
            throw iae;
        }
        catch (InvocationTargetException ite)
        {
            // if this happens, it's all their issue
            throw new IllegalArgumentException("There was an exception while executing "+CONFIG_FACTORY_METHOD+" in class "+factory.getName(), ite.getCause());
        }
    }