private static Object _swapStaticFieldIfNotClass()

in subsystem/subsystem-core/src/main/java/org/apache/aries/subsystem/core/capabilityset/SecureAction.java [1004:1072]
65 lines of code
18 McCabe index (conditional complexity)

    private static Object _swapStaticFieldIfNotClass(Class targetClazz,
        Class targetType, Class condition, String lockName) throws Exception
    {
        Object lock = null;
        if (lockName != null)
        {
            try
            {
                Field lockField =
                    targetClazz.getDeclaredField(lockName);
                lockField.setAccessible(true);
                lock = lockField.get(null);
            }
            catch (NoSuchFieldException ex)
            {
            }
        }
        if (lock == null)
        {
            lock = targetClazz;
        }
        synchronized (lock)
        {
            Field[] fields = targetClazz.getDeclaredFields();

            Object result = null;
            for (int i = 0; (i < fields.length) && (result == null); i++)
            {
                if (Modifier.isStatic(fields[i].getModifiers()) &&
                    (fields[i].getType() == targetType))
                {
                    fields[i].setAccessible(true);

                    result = fields[i].get(null);

                    if (result != null)
                    {
                        if ((condition == null) ||
                            !result.getClass().getName().equals(condition.getName()))
                        {
                            fields[i].set(null, null);
                        }
                    }
                }
            }
            if (result != null)
            {
                if ((condition == null) || !result.getClass().getName().equals(condition.getName()))
                {
                    // reset cache
                    for (int i = 0; i < fields.length; i++)
                    {
                        if (Modifier.isStatic(fields[i].getModifiers()) &&
                            (fields[i].getType() == Hashtable.class))
                        {
                            fields[i].setAccessible(true);
                            Hashtable cache = (Hashtable) fields[i].get(null);
                            if (cache != null)
                            {
                                cache.clear();
                            }
                        }
                    }
                }
                return result;
            }
        }
        return null;
    }