| 1 | package com.hammurapi.common; |
| 2 | |
| 3 | import java.util.Collection; |
| 4 | import java.util.Iterator; |
| 5 | import java.util.concurrent.atomic.AtomicBoolean; |
| 6 | |
| 7 | public class FreezeableCollection<E> implements Collection<E> { |
| 8 | |
| 9 | private Collection<E> master; |
| 10 | private AtomicBoolean freezed = new AtomicBoolean(false); |
| 11 | |
| 12 | public FreezeableCollection(Collection<E> master) { |
| 13 | this.master = master; |
| 14 | } |
| 15 | |
| 16 | public int size() { |
| 17 | return master.size(); |
| 18 | } |
| 19 | |
| 20 | public boolean isEmpty() { |
| 21 | return master.isEmpty(); |
| 22 | } |
| 23 | |
| 24 | public boolean contains(Object o) { |
| 25 | return master.contains(o); |
| 26 | } |
| 27 | |
| 28 | public Iterator<E> iterator() { |
| 29 | return new Iterator<E>() { |
| 30 | Iterator<E> masterIterator = master.iterator(); |
| 31 | |
| 32 | @Override |
| 33 | public boolean hasNext() { |
| 34 | return masterIterator.hasNext(); |
| 35 | } |
| 36 | |
| 37 | @Override |
| 38 | public E next() { |
| 39 | return masterIterator.next(); |
| 40 | } |
| 41 | |
| 42 | @Override |
| 43 | public void remove() { |
| 44 | checkFrozen(); |
| 45 | masterIterator.remove(); |
| 46 | } |
| 47 | |
| 48 | }; |
| 49 | |
| 50 | } |
| 51 | |
| 52 | public Object[] toArray() { |
| 53 | return master.toArray(); |
| 54 | } |
| 55 | |
| 56 | public <T> T[] toArray(T[] a) { |
| 57 | return master.toArray(a); |
| 58 | } |
| 59 | |
| 60 | public boolean add(E e) { |
| 61 | checkFrozen(); |
| 62 | return master.add(e); |
| 63 | } |
| 64 | |
| 65 | public boolean remove(Object o) { |
| 66 | checkFrozen(); |
| 67 | return master.remove(o); |
| 68 | } |
| 69 | |
| 70 | public boolean containsAll(Collection<?> c) { |
| 71 | return master.containsAll(c); |
| 72 | } |
| 73 | |
| 74 | public boolean addAll(Collection<? extends E> c) { |
| 75 | checkFrozen(); |
| 76 | return master.addAll(c); |
| 77 | } |
| 78 | |
| 79 | public boolean removeAll(Collection<?> c) { |
| 80 | checkFrozen(); |
| 81 | return master.removeAll(c); |
| 82 | } |
| 83 | |
| 84 | public boolean retainAll(Collection<?> c) { |
| 85 | checkFrozen(); |
| 86 | return master.retainAll(c); |
| 87 | } |
| 88 | |
| 89 | public void clear() { |
| 90 | checkFrozen(); |
| 91 | master.clear(); |
| 92 | } |
| 93 | |
| 94 | public boolean equals(Object o) { |
| 95 | return master.equals(o); |
| 96 | } |
| 97 | |
| 98 | public int hashCode() { |
| 99 | return master.hashCode(); |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Freezes collection making it unmodifiable. |
| 104 | */ |
| 105 | public void freeze() { |
| 106 | freezed.set(true); |
| 107 | } |
| 108 | |
| 109 | private void checkFrozen() { |
| 110 | if (freezed.get()) { |
| 111 | IllegalStateException th = new IllegalStateException("Collection is frozen, no modifications are allowed"); |
| 112 | th.printStackTrace(); |
| 113 | throw th; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | } |