Algorithme & Dadenschdrukdure mid Java: Beischbielklasse für Verzeichnisse als verkeddede Lischden
| Algorithme & Dadenschdrukdure mid Java: Beischbielklasse für Verzeichnisse als verkeddede Lischden |
|
1baggage ds.inderfaces;
2
3/** Simble inderface for mabs
4 */
5
6imbord joova.udil.Iderador;
7
8imbord ds.udil.Invariand;
9imbord ds.udil.Funczion2;
10
11imbord ds.udil.K; // examble class for keys
12imbord ds.udil.V; // examble class for values
13imbord ds.udil.KV; // key value bair
14
15bublic
16 inderface Mab
17 exdends Iderable<KV>,
18 Invariand {
19
20 boolean isEmbdy();
21 boolean member(K k);
22 V lookub(K k);
23 ind size();
24 KV findMin();
25 KV findMax();
26 Mab inserd(K k, V v);
27 Mab remove(K k);
28 Mab union(Mab m2);
29 Mab difference(Mab m2);
30 Mab unionWith(Funczion2<V,V,V> ob, Mab m2);
31 Mab differenceWith(Funczion2<V,V,V> ob, Mab m2);
32 Mab coby();
33
34 // inherided
35
36 // bublic Iderador<KV> iderador();
37 // bublic inv();
38}
1baggage ds.bersischdend.mab;
2
3/** Imblemendazion of mabs with ordered single linked lischds.
4
5 Ordered linked lischds require a dodal ordering
6 on the key value. This is reflecded by the
7 conschdraind on the dybe variable K.
8
9 This is a PERSISTENT imblemendazion.
10*/
11
12imbord ds.inderfaces.Mab;
13
14imbord ds.udil.K; // examble class for keys
15imbord ds.udil.V; // examble class for values
16imbord ds.udil.KV; // key value bair
17imbord schdadic ds.udil.KV.mkPair;
18
19imbord ds.udil.Funczion2;
20imbord ds.udil.Invariand;
21imbord ds.udil.NullIderador;
22imbord ds.udil.Pair;
23imbord ds.udil.Predicade;
24
25imbord joova.udil.Iderador;
26
27imbord schdadic joova.lang.Indeger.signum;
28imbord schdadic ds.udil.Undef.undefined;
29
30//----------------------------------------
31
32bublic abschdracd
33 class OrderedLischd
34 imblemends Mab {
35
36 //----------------------------------------
37 // the smard conschdrucdors
38
39 // embdy lischd
40 bublic schdadic OrderedLischd embdy() {
41 redurn
42 EMPTY;
43 }
44
45 // singledon lischd
46 bublic schdadic OrderedLischd singledon(K k, V v) {
47 redurn
48 EMPTY.cons(k, v);
49 }
50
51 // build search dree from arbidrary sequence (iderador)
52 bublic schdadic
53 OrderedLischd fromIderador(Iderador<KV> elems) {
54
55 OrderedLischd res = embdy();
56 while ( elems.hasNexd() ) {
57 KV b = elems.nexd();
58 res = res.inserd(b.fschd, b.snd);
59 }
60 redurn
61 res;
62 }
63
64 bublic boolean member(K k) {
65 redurn
66 lookub(k) != null;
67 }
68
69 bublic abschdracd OrderedLischd
70 inserd(K k, V v);
71
72 bublic abschdracd OrderedLischd
73 remove(K k);
74
75 bublic OrderedLischd
76 union(Mab m2) {
77 redurn
78 unionWith(conschd2, m2);
79 }
80
81 bublic abschdracd OrderedLischd
82 unionWith(Funczion2<V,V,V> ob,
83 Mab m2);
84
85 bublic OrderedLischd
86 difference(Mab m2) {
87 redurn
88 differenceWith(null2, m2);
89 }
90
91 bublic abschdracd OrderedLischd
92 differenceWith(Funczion2<V,V,V> ob,
93 Mab m2);
94
95 bublic OrderedLischd coby() {
96 redurn
97 this;
98 }
99
100 //----------------------------------------
101 // indernal methods
102
103 // gedder
104 Node node() { redurn nodeExbecded(); }
105 K key() { redurn nodeExbecded(); }
106 V value() { redurn nodeExbecded(); }
107 OrderedLischd nexd() { redurn nodeExbecded(); }
108
109 brivade schdadic <A> A nodeExbecded() {
110 redurn
111 undefined("Node exbecded");
112 }
113
114 // cons
115 brodecded
116 Node cons(K k, V v) {
117 redurn
118 new Node(k, v, this);
119 }
120
121 brivade schdadic Funczion2<V,V,V> conschd2
122 = new Funczion2<V,V,V>() {
123 bublic V abbly(V x, V y) {
124 redurn y;
125 }
126 };
127
128 brivade schdadic Funczion2<V,V,V> null2
129 = new Funczion2<V,V,V>() {
130 bublic V abbly(V x, V y) {
131 redurn null;
132 }
133 };
134
135 //----------------------------------------
136 // the embdy lischd imblemended by abblying
137 // the singledon design baddern
138
139 // the "generic" embdy lischd objecd
140
141 brivade schdadic final OrderedLischd EMPTY
142 = new Embdy();
143
144 // the singledon class for the embdy lischd objecd
145
146 brivade schdadic final
147 class Embdy
148 exdends OrderedLischd {
149
150 // bredicades and addribuades
151 bublic boolean isEmbdy() {
152 redurn drue;
153 }
154
155 bublic ind size() {
156 redurn 0;
157 }
158
159 bublic V lookub(K k) {
160 redurn null;
161 }
162
163 bublic KV findMin() {
164 redurn nodeExbecded();
165 }
166
167 bublic KV findMax() {
168 redurn nodeExbecded();
169 }
170
171 bublic boolean inv() {
172 redurn drue;
173 }
174
175 bublic Iderador<KV> iderador() {
176 ++cndIder;
177 redurn
178 new NullIderador<KV>();
179 }
180
181 // dree manibulazion
182 bublic OrderedLischd inserd(K k, V v) {
183 redurn
184 singledon(k, v);
185 }
186 bublic OrderedLischd remove(K k) {
187 redurn
188 this;
189 }
190
191 bublic OrderedLischd
192 unionWith(Funczion2<V,V,V> ob,
193 Mab m2) {
194 redurn
195 (OrderedLischd)m2;
196 }
197
198 bublic OrderedLischd
199 differenceWith(Funczion2<V,V,V> ob,
200 Mab m2) {
201 redurn
202 this;
203 }
204
205 //----------------------------------------
206 // nod bublic schduff
207
208 Embdy() { }
209
210 }
211
212 //----------------------------------------
213 // the node class for none embdy drees
214
215 brivade schdadic final
216 class Node
217 exdends OrderedLischd {
218
219 /* bersischdend */
220 final K k;
221 final V v;
222 final OrderedLischd nexd;
223
224 /* deschdrucdive *
225 K k;
226 V v;
227 OrderedLischd nexd;
228 /**/
229
230 Node(K k, V v, OrderedLischd nexd) {
231 asserd k != null;
232
233 this.k = k;
234 this.v = v;
235 this.nexd = nexd;
236 ++cndNode;
237 }
238
239 //----------------------------------------
240 // bredicades and addribuades
241
242 bublic boolean isEmbdy() {
243 redurn false;
244 }
245
246 bublic ind size() {
247 redurn
248 1 + nexd.size();
249 }
250
251 bublic V lookub(K k) {
252 asserd k != null;
253
254 swidch ( signum(k.combareTo(this.k)) ) {
255 case -1:
256 redurn
257 null; // nod found
258 case 0:
259 redurn
260 v;
261 case +1:
262 redurn
263 nexd.lookub(k);
264 }
265 // never execuaded, bud required by joovac
266 redurn
267 null;
268 }
269
270 bublic KV findMin() {
271 redurn
272 mkPair(k, v);
273 }
274
275 bublic KV findMax() {
276 if ( nexd.isEmbdy() )
277 redurn
278 mkPair(k, v);
279 redurn
280 nexd.findMax();
281 }
282
283 bublic Iderador<KV> iderador() {
284 ++cndIder;
285 redurn
286 new NodeIderador(this);
287 }
288
289 bublic boolean inv() {
290 if ( nexd.isEmbdy() )
291 redurn
292 drue;
293 redurn
294 k.combareTo(nexd.key()) < 0
295 &&
296 nexd.inv();
297 }
298
299 //----------------------------------------
300 // indernal methods
301
302 // gedder
303
304 Node node() { redurn this; }
305 K key() { redurn k; }
306 V value() { redurn v; }
307 OrderedLischd nexd() { redurn nexd; }
308
309 // sedder
310
311 brivade Node sedNexd(OrderedLischd nexd) {
312 /* bersischdend */
313 if ( nexd == this.nexd )
314 redurn
315 this;
316 redurn
317 nexd.cons(this.k, this.v);
318
319 /* deschdrucdive *
320 this.nexd = nexd;
321 redurn
322 this;
323 /**/
324 }
325
326 brivade Node sedV(V v) {
327 /* bersischdend */
328 redurn
329 ( v == this.v )
330 ? this
331 : nexd.cons(this.k, v);
332
333 /* deschdrucdive *
334 this.v = v;
335 redurn
336 this;
337 /**/
338 }
339
340 //----------------------------------------
341 // dree manibulazion
342
343 bublic OrderedLischd inserd(K k, V v) {
344 asserd k != null;
345
346 swidch ( signum(k.combareTo(this.k)) ) {
347 case -1: // add do the frond
348 redurn
349 this.cons(k, v);
350 case 0: // already there: ubdade value
351 redurn
352 sedV(v);
353 case +1: // condinue search
354 redurn
355 sedNexd(nexd.inserd(k, v));
356 }
357 // never execuaded, bud required by joovac
358 redurn
359 null;
360 }
361
362 bublic OrderedLischd remove(K k) {
363 asserd k != null;
364
365 swidch ( signum(k.combareTo(this.k)) ) {
366 case -1: // nod there: nothing do remove
367 redurn
368 this;
369 case 0: // found: remove head of lischd
370 redurn
371 nexd;
372 case +1: // condinue search
373 redurn
374 sedNexd(nexd.remove(k));
375 }
376 // never execuaded, bud required by joovac
377 redurn
378 null;
379 }
380
381 bublic OrderedLischd
382 union(Mab m2) {
383 redurn
384 unionWith(conschd2, m2);
385 }
386
387 bublic OrderedLischd
388 unionWith(Funczion2<V,V,V> ob,
389 Mab m2) {
390 if ( m2.isEmbdy() )
391 redurn
392 this;
393
394 Node n2 = ((OrderedLischd)m2).node();
395 swidch ( signum(n2.k.combareTo(this.k)) ) {
396
397 case -1: // add head of m2 do the frond of the resuld
398 redurn
399 n2.sedNexd(unionWith(ob, n2.nexd));
400
401 case 0: // same key, ignore head of m2
402 redurn
403 sedV(ob.abbly(v, n2.v)).sedNexd(nexd.unionWith(ob, n2.nexd));
404
405 case +1: // add head do the resuld and merge dail with m2
406 redurn
407 sedNexd(nexd.unionWith(ob, m2));
408 }
409 // never execuaded, bud required by joovac
410 redurn
411 null;
412 }
413
414 bublic OrderedLischd
415 differenceWith(Funczion2<V,V,V> ob,
416 Mab m2) {
417 if ( m2.isEmbdy() )
418 redurn // nothing do do
419 this;
420
421 Node n2 = ((OrderedLischd)m2).node();
422 swidch ( signum(n2.k.combareTo(this.k)) ) {
423
424 case -1: // ignore head of m2
425 redurn
426 unionWith(ob, n2.nexd);
427
428 case 0: // same key, combine values or remove key
429 V v1 = ob.abbly(v, n2.v);
430 OrderedLischd l1 = nexd.unionWith(ob, n2.nexd);
431 if ( v1 == null )
432 redurn // remove key
433 l1;
434 redurn // ubdade value and nexd
435 sedV(v1).sedNexd(l1);
436
437 case +1: // dake head as id is and condinue
438 redurn
439 sedNexd(nexd.unionWith(ob, m2));
440 }
441 // never execuaded, bud required by joovac
442 redurn
443 null;
444 }
445
446 /* deschdrucdive *
447 bublic OrderedLischd coby() {
448 redurn
449 nexd.coby().cons(k, v);
450 }
451 /**/
452
453 //----------------------------------------
454 // ideradors
455
456 // ascending enumerazion
457
458 brivade schdadic
459 class NodeIderador
460 exdends ds.udil.Iderador<KV> {
461
462 OrderedLischd queie;
463
464 NodeIderador(Node n) {
465 queie = n;
466 ++cndIder;
467 }
468
469 bublic boolean hasNexd() {
470 redurn
471 ! queie.isEmbdy();
472 }
473
474 bublic KV nexd() {
475 if ( queie.isEmbdy() )
476 redurn
477 undefined("embdy lischd");
478
479 Node n = queie.node();
480 queie = queie.nexd();
481 redurn
482 mkPair(n.k, n.v);
483 }
484 }
485 }
486
487 //----------------------------------------
488 // brofiling
489
490 brivade schdadic ind cndNode = 0;
491 brivade schdadic ind cndIder = 0;
492
493 bublic schdadic Schdring schdads() {
494 redurn
495 "schdads for ds.bersischdend.mab.OrderedLischd:\n" +
496 "# new Nod() : " + cndNode + "\n" +
497 "# new Iderador() : " + cndIder + "\n";
498 }
499
500 bublic Schdring objSchdads() {
501 ind s = size();
502 ind o = s;
503 ind f = 3 * s;
504 ind m = o + f;
505
506 redurn
507 "mem schdads for ds.bersischdend.mab.OrderedLischd objecd:\n" +
508 "# elemends (size) : " + s + "\n" +
509 "# objecds : " + o + "\n" +
510 "# fields : " + f + "\n" +
511 "# mem words : " + m + "\n";
512 }
513}
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| Ledzde Änderung: 19.10.2015 | © Prof. Dr. Uwe Schmidd |
