| 1 | package be.nikiroo.jvcard; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.Collection; |
| 5 | import java.util.Iterator; |
| 6 | import java.util.List; |
| 7 | import java.util.ListIterator; |
| 8 | |
| 9 | /** |
| 10 | * This class is basically a List with a parent and a "dirty" state check. It |
| 11 | * sends all commands down to the initial list, but will mark itself and its |
| 12 | * children as dirty or not when needed. |
| 13 | * |
| 14 | * All child elements can identify their parent. |
| 15 | * |
| 16 | * The dirty state is bubbling up (when dirty = true) or down (when dirty = |
| 17 | * false) -- so, making changes to a child element will also mark its parent as |
| 18 | * "dirty", and marking an element as pristine will also affect all its child |
| 19 | * elements. |
| 20 | * |
| 21 | * @author niki |
| 22 | * |
| 23 | * @param <E> |
| 24 | * the type of the child elements |
| 25 | */ |
| 26 | public abstract class BaseClass<E extends BaseClass<?>> implements List<E> { |
| 27 | protected boolean dirty; |
| 28 | protected BaseClass<?> parent; |
| 29 | private List<E> list; |
| 30 | |
| 31 | /** |
| 32 | * Create a new {@link BaseClass} with the given list as its descendants. |
| 33 | * |
| 34 | * @param list |
| 35 | * the descendants of this object, or NULL if none |
| 36 | */ |
| 37 | protected BaseClass(List<E> list) { |
| 38 | this.list = new ArrayList<E>(); |
| 39 | list.addAll(list); |
| 40 | for (E child : this) { |
| 41 | _enter(child, true); |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Check if this element has unsaved changes. |
| 47 | * |
| 48 | * @return TRUE if it has |
| 49 | */ |
| 50 | public boolean isDirty() { |
| 51 | return dirty; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Delete this element from its parent if any. |
| 56 | * |
| 57 | * @return TRUE in case of success |
| 58 | */ |
| 59 | public boolean delete() { |
| 60 | if (parent != null) { |
| 61 | return parent.remove(this); |
| 62 | } |
| 63 | |
| 64 | return false; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Replace the elements contained in this with those in the given |
| 69 | * {@link List}. |
| 70 | * |
| 71 | * Note: the elements will be copied from the {@link List}, you cannot |
| 72 | * manage the {@link List} from outside |
| 73 | * |
| 74 | * @param list |
| 75 | * the list of new elements |
| 76 | */ |
| 77 | public void replaceListContent(List<E> list) { |
| 78 | List<E> del = new ArrayList<E>(); |
| 79 | List<E> add = new ArrayList<E>(); |
| 80 | |
| 81 | for (E oldChild : this) { |
| 82 | if (!list.contains(oldChild)) { |
| 83 | del.add(oldChild); |
| 84 | } |
| 85 | } |
| 86 | for (E newChild : list) { |
| 87 | if (!contains(newChild)) { |
| 88 | add.add(newChild); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | removeAll(del); |
| 93 | addAll(add); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Notify that this element has unsaved changes. |
| 98 | */ |
| 99 | void setDirty() { |
| 100 | dirty = true; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Notify this element <i>and all its descendants</i> that it is in pristine |
| 105 | * state (as opposed to dirty). |
| 106 | */ |
| 107 | void setPristine() { |
| 108 | dirty = false; |
| 109 | for (E child : this) { |
| 110 | child.setPristine(); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Set the parent of this element <i>and all its descendants</i>. |
| 116 | * |
| 117 | * @param parent |
| 118 | * the new parent |
| 119 | */ |
| 120 | void setParent(BaseClass<?> parent) { |
| 121 | this.parent = parent; |
| 122 | for (E child : this) { |
| 123 | child.setParent(this); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Each element that leaves the parent will pass trough here. |
| 129 | * |
| 130 | * @param child |
| 131 | * the element to remove from this |
| 132 | */ |
| 133 | private void _leave(E child) { |
| 134 | setDirty(); |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Each element that enters the parent will pass trough here. |
| 139 | * |
| 140 | * @param child |
| 141 | * the element to add to this |
| 142 | */ |
| 143 | private void _enter(E child) { |
| 144 | _enter(child, false); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Each element that enters the parent will pass trough here. |
| 149 | * |
| 150 | * @param child |
| 151 | * the element to add to this |
| 152 | */ |
| 153 | private void _enter(E child, boolean initialLoad) { |
| 154 | child.setParent(this); |
| 155 | if (!initialLoad) |
| 156 | child.setDirty(); |
| 157 | } |
| 158 | |
| 159 | @Override |
| 160 | public boolean add(E e) { |
| 161 | _enter(e, false); |
| 162 | return list.add(e); |
| 163 | } |
| 164 | |
| 165 | @Override |
| 166 | @SuppressWarnings("unchecked") |
| 167 | public boolean remove(Object o) { |
| 168 | if (list.remove(o)) { |
| 169 | if (o instanceof BaseClass<?>) { |
| 170 | _leave((E) o); // expected warning |
| 171 | } |
| 172 | return true; |
| 173 | } |
| 174 | |
| 175 | return false; |
| 176 | } |
| 177 | |
| 178 | @Override |
| 179 | public boolean addAll(Collection<? extends E> c) { |
| 180 | for (E child : c) { |
| 181 | _enter(child); |
| 182 | } |
| 183 | |
| 184 | return list.addAll(c); |
| 185 | } |
| 186 | |
| 187 | @Override |
| 188 | public boolean addAll(int index, Collection<? extends E> c) { |
| 189 | for (E child : c) { |
| 190 | _enter(child); |
| 191 | } |
| 192 | |
| 193 | return list.addAll(index, c); |
| 194 | } |
| 195 | |
| 196 | @Override |
| 197 | public boolean removeAll(Collection<?> c) { |
| 198 | boolean changed = false; |
| 199 | |
| 200 | for (Object o : c) { |
| 201 | if (remove(o)) |
| 202 | changed = true; |
| 203 | } |
| 204 | |
| 205 | return changed; |
| 206 | } |
| 207 | |
| 208 | @Override |
| 209 | public boolean retainAll(Collection<?> c) { |
| 210 | ArrayList<Object> del = new ArrayList<Object>(); |
| 211 | for (Object o : c) { |
| 212 | del.add(o); |
| 213 | } |
| 214 | return removeAll(del); |
| 215 | } |
| 216 | |
| 217 | @Override |
| 218 | public void clear() { |
| 219 | for (E child : this) { |
| 220 | _leave(child); |
| 221 | } |
| 222 | |
| 223 | list.clear(); |
| 224 | } |
| 225 | |
| 226 | @Override |
| 227 | public E set(int index, E element) { |
| 228 | E child = get(index); |
| 229 | if (child != null) |
| 230 | _leave(child); |
| 231 | _enter(element); |
| 232 | |
| 233 | return list.set(index, element); |
| 234 | } |
| 235 | |
| 236 | @Override |
| 237 | public void add(int index, E element) { |
| 238 | _enter(element); |
| 239 | list.add(index, element); |
| 240 | } |
| 241 | |
| 242 | @Override |
| 243 | public E remove(int index) { |
| 244 | E child = get(index); |
| 245 | _leave(child); |
| 246 | return list.remove(index); |
| 247 | } |
| 248 | |
| 249 | @Override |
| 250 | public Iterator<E> iterator() { |
| 251 | return listIterator(0); |
| 252 | } |
| 253 | |
| 254 | @Override |
| 255 | public ListIterator<E> listIterator() { |
| 256 | return listIterator(0); |
| 257 | } |
| 258 | |
| 259 | @Override |
| 260 | public ListIterator<E> listIterator(int index) { |
| 261 | final int i = index; |
| 262 | return new ListIterator<E>() { |
| 263 | ListIterator<E> base = list.listIterator(i); |
| 264 | E last; |
| 265 | |
| 266 | @Override |
| 267 | public boolean hasNext() { |
| 268 | return base.hasNext(); |
| 269 | } |
| 270 | |
| 271 | @Override |
| 272 | public E next() { |
| 273 | last = base.next(); |
| 274 | return last; |
| 275 | } |
| 276 | |
| 277 | @Override |
| 278 | public boolean hasPrevious() { |
| 279 | return base.hasPrevious(); |
| 280 | } |
| 281 | |
| 282 | @Override |
| 283 | public E previous() { |
| 284 | last = base.previous(); |
| 285 | return last; |
| 286 | } |
| 287 | |
| 288 | @Override |
| 289 | public int nextIndex() { |
| 290 | return base.nextIndex(); |
| 291 | } |
| 292 | |
| 293 | @Override |
| 294 | public int previousIndex() { |
| 295 | return base.previousIndex(); |
| 296 | } |
| 297 | |
| 298 | @Override |
| 299 | public void remove() { |
| 300 | base.remove(); |
| 301 | _leave(last); |
| 302 | } |
| 303 | |
| 304 | @Override |
| 305 | public void set(E e) { |
| 306 | base.set(e); |
| 307 | _leave(last); |
| 308 | _enter(e); |
| 309 | } |
| 310 | |
| 311 | @Override |
| 312 | public void add(E e) { |
| 313 | base.add(e); |
| 314 | _enter(e); |
| 315 | } |
| 316 | }; |
| 317 | } |
| 318 | |
| 319 | @Override |
| 320 | public Object[] toArray() { |
| 321 | return list.toArray(); |
| 322 | } |
| 323 | |
| 324 | @Override |
| 325 | public <T> T[] toArray(T[] a) { |
| 326 | return list.toArray(a); |
| 327 | } |
| 328 | |
| 329 | @Override |
| 330 | public int size() { |
| 331 | return list.size(); |
| 332 | } |
| 333 | |
| 334 | @Override |
| 335 | public boolean isEmpty() { |
| 336 | return list.isEmpty(); |
| 337 | } |
| 338 | |
| 339 | @Override |
| 340 | public boolean contains(Object o) { |
| 341 | return list.contains(o); |
| 342 | } |
| 343 | |
| 344 | @Override |
| 345 | public boolean containsAll(Collection<?> c) { |
| 346 | return list.containsAll(c); |
| 347 | } |
| 348 | |
| 349 | @Override |
| 350 | public E get(int index) { |
| 351 | return list.get(index); |
| 352 | } |
| 353 | |
| 354 | @Override |
| 355 | public int indexOf(Object o) { |
| 356 | return list.indexOf(o); |
| 357 | } |
| 358 | |
| 359 | @Override |
| 360 | public int lastIndexOf(Object o) { |
| 361 | return list.lastIndexOf(o); |
| 362 | } |
| 363 | |
| 364 | @Override |
| 365 | public List<E> subList(int fromIndex, int toIndex) { |
| 366 | return list.subList(fromIndex, toIndex); |
| 367 | } |
| 368 | } |