| 1 | package com.hammurapi.common; |
| 2 | |
| 3 | import java.lang.reflect.Array; |
| 4 | import java.util.ArrayList; |
| 5 | import java.util.Iterator; |
| 6 | import java.util.List; |
| 7 | import java.util.ServiceLoader; |
| 8 | |
| 9 | /** |
| 10 | * Helper class. |
| 11 | * @author Pavel Vlasov |
| 12 | * |
| 13 | */ |
| 14 | public class Util { |
| 15 | |
| 16 | /** |
| 17 | * Loads single instance of service. |
| 18 | * @param <T> |
| 19 | * @param type |
| 20 | * @return |
| 21 | */ |
| 22 | static Context loadContext() { |
| 23 | List<Context> parts = new ArrayList<Context>(); |
| 24 | Iterator<Context> it = ServiceLoader.load(Context.class, Util.class.getClassLoader()).iterator(); |
| 25 | while (it.hasNext()) { |
| 26 | parts.add(it.next()); |
| 27 | } |
| 28 | parts.add(new DefaultContext(Util.class.getClassLoader(), null)); |
| 29 | return new CompositeContext(parts.toArray(new Context[parts.size()])); |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * Wraps a single object into array to avoid problems with generic arrays. |
| 34 | * @param <V> |
| 35 | * @param obj |
| 36 | * @return |
| 37 | */ |
| 38 | @SuppressWarnings("unchecked") |
| 39 | public static <V> V[] wrap(V obj) { |
| 40 | if (obj == null) { |
| 41 | return (V[]) new Object[] {null}; |
| 42 | } |
| 43 | V[] ret = (V[]) Array.newInstance(obj.getClass(), 1); |
| 44 | ret[0] = obj; |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | } |