Class UnmodifiableCollection

classpath/java/util/Collections.java:715–781

  }
  
  static class UnmodifiableCollection<T> implements Collection<T> {
    private final Collection<T> inner;
    
    UnmodifiableCollection(Collection<T> inner) {
      this.inner = inner;
    }
    
    @Override
    public Iterator<T> iterator() {
      return new UnmodifiableIterator<T>(inner.iterator());
    }

    @Override
    public int size() {
      return inner.size();
    }

    @Override
    public boolean isEmpty() {
      return inner.isEmpty();
    }

    @Override
    public boolean contains(Object element) {
      return inner.contains(element);
    }

    @Override
    public boolean containsAll(Collection<?> c) {
      return inner.containsAll(c);
    }

    @Override
    public boolean add(T element) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean addAll(Collection<? extends T> collection) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean remove(Object element) {
      throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeAll(Collection<?> c) {
      throw new UnsupportedOperationException();
    }

    @Override
    public Object[] toArray() {
      return inner.toArray();
    }

    @Override