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author | Mike Buland <eichlan@xagasoft.com> | 2007-08-05 04:57:04 +0000 |
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committer | Mike Buland <eichlan@xagasoft.com> | 2007-08-05 04:57:04 +0000 |
commit | 9cf4949ff56464ce4737fd3a0e6b757032354b0e (patch) | |
tree | 748d74a84c73f929d3c9874cf1b5bbccdf78dd1e | |
parent | 383ad5a674e192830287dfdd53d48507b9aea46e (diff) | |
download | libbu++-9cf4949ff56464ce4737fd3a0e6b757032354b0e.tar.gz libbu++-9cf4949ff56464ce4737fd3a0e6b757032354b0e.tar.bz2 libbu++-9cf4949ff56464ce4737fd3a0e6b757032354b0e.tar.xz libbu++-9cf4949ff56464ce4737fd3a0e6b757032354b0e.zip |
Set is just a copy of hash for now. It'd be cool if they could be linked, not
really sure how that could happen easily.
-rw-r--r-- | src/set.cpp | 101 | ||||
-rw-r--r-- | src/set.h | 1072 |
2 files changed, 1173 insertions, 0 deletions
diff --git a/src/set.cpp b/src/set.cpp new file mode 100644 index 0000000..a207c29 --- /dev/null +++ b/src/set.cpp | |||
@@ -0,0 +1,101 @@ | |||
1 | #include "hash.h" | ||
2 | |||
3 | namespace Bu { subExceptionDef( HashException ) } | ||
4 | |||
5 | template<> uint32_t Bu::__calcHashCode<int>( const int &k ) | ||
6 | { | ||
7 | return k; | ||
8 | } | ||
9 | |||
10 | template<> bool Bu::__cmpHashKeys<int>( const int &a, const int &b ) | ||
11 | { | ||
12 | return a == b; | ||
13 | } | ||
14 | |||
15 | template<> uint32_t Bu::__calcHashCode<unsigned int>( const unsigned int &k ) | ||
16 | { | ||
17 | return k; | ||
18 | } | ||
19 | |||
20 | template<> bool Bu::__cmpHashKeys<unsigned int>( const unsigned int &a, const unsigned int &b ) | ||
21 | { | ||
22 | return a == b; | ||
23 | } | ||
24 | |||
25 | template<> | ||
26 | uint32_t Bu::__calcHashCode<const char *>( const char * const &k ) | ||
27 | { | ||
28 | if (k == NULL) | ||
29 | { | ||
30 | return 0; | ||
31 | } | ||
32 | |||
33 | unsigned long int nPos = 0; | ||
34 | for( const char *s = k; *s; s++ ) | ||
35 | { | ||
36 | nPos = *s + (nPos << 6) + (nPos << 16) - nPos; | ||
37 | } | ||
38 | |||
39 | return nPos; | ||
40 | } | ||
41 | |||
42 | template<> bool Bu::__cmpHashKeys<const char *>( const char * const &a, const char * const &b ) | ||
43 | { | ||
44 | if( a == b ) | ||
45 | return true; | ||
46 | |||
47 | for(int j=0; a[j] == b[j]; j++ ) | ||
48 | if( a[j] == '\0' ) | ||
49 | return true; | ||
50 | |||
51 | return false; | ||
52 | } | ||
53 | |||
54 | template<> | ||
55 | uint32_t Bu::__calcHashCode<char *>( char * const &k ) | ||
56 | { | ||
57 | if (k == NULL) | ||
58 | { | ||
59 | return 0; | ||
60 | } | ||
61 | |||
62 | unsigned long int nPos = 0; | ||
63 | for( const char *s = k; *s; s++ ) | ||
64 | { | ||
65 | nPos = *s + (nPos << 6) + (nPos << 16) - nPos; | ||
66 | } | ||
67 | |||
68 | return nPos; | ||
69 | } | ||
70 | |||
71 | template<> bool Bu::__cmpHashKeys<char *>( char * const &a, char * const &b ) | ||
72 | { | ||
73 | if( a == b ) | ||
74 | return true; | ||
75 | |||
76 | for(int j=0; a[j] == b[j]; j++ ) | ||
77 | if( a[j] == '\0' ) | ||
78 | return true; | ||
79 | |||
80 | return false; | ||
81 | } | ||
82 | |||
83 | template<> uint32_t Bu::__calcHashCode<std::string>( const std::string &k ) | ||
84 | { | ||
85 | std::string::size_type j, sz = k.size(); | ||
86 | const char *s = k.c_str(); | ||
87 | |||
88 | unsigned long int nPos = 0; | ||
89 | for( j = 0; j < sz; j++, s++ ) | ||
90 | { | ||
91 | nPos = *s + (nPos << 6) + (nPos << 16) - nPos; | ||
92 | } | ||
93 | |||
94 | return nPos; | ||
95 | } | ||
96 | |||
97 | template<> bool Bu::__cmpHashKeys<std::string>( const std::string &a, const std::string &b ) | ||
98 | { | ||
99 | return a == b; | ||
100 | } | ||
101 | |||
diff --git a/src/set.h b/src/set.h new file mode 100644 index 0000000..36665a6 --- /dev/null +++ b/src/set.h | |||
@@ -0,0 +1,1072 @@ | |||
1 | #ifndef BU_HASH_H | ||
2 | #define BU_HASH_H | ||
3 | |||
4 | #include <stddef.h> | ||
5 | #include <string.h> | ||
6 | #include <memory> | ||
7 | #include <iostream> | ||
8 | #include <list> | ||
9 | #include <utility> | ||
10 | #include "bu/exceptionbase.h" | ||
11 | #include "bu/list.h" | ||
12 | ///#include "archival.h" | ||
13 | ///#include "archive.h" | ||
14 | |||
15 | #define bitsToBytes( n ) (n/32+(n%32>0 ? 1 : 0)) | ||
16 | |||
17 | namespace Bu | ||
18 | { | ||
19 | subExceptionDecl( HashException ) | ||
20 | |||
21 | enum eHashException | ||
22 | { | ||
23 | excodeNotFilled | ||
24 | }; | ||
25 | |||
26 | template<typename T> | ||
27 | uint32_t __calcHashCode( const T &k ); | ||
28 | |||
29 | template<typename T> | ||
30 | bool __cmpHashKeys( const T &a, const T &b ); | ||
31 | |||
32 | struct __calcNextTSize_fast | ||
33 | { | ||
34 | uint32_t operator()( uint32_t nCapacity, uint32_t nFill, uint32_t nDeleted ) const | ||
35 | { | ||
36 | if( nDeleted >= nCapacity/2 ) | ||
37 | return nCapacity; | ||
38 | return nCapacity*2+1; | ||
39 | } | ||
40 | }; | ||
41 | |||
42 | template<typename key, typename value, typename sizecalc = __calcNextTSize_fast, typename keyalloc = std::allocator<key>, typename valuealloc = std::allocator<value>, typename challoc = std::allocator<uint32_t> > | ||
43 | class Hash; | ||
44 | |||
45 | template< typename key, typename _value, typename sizecalc = __calcNextTSize_fast, typename keyalloc = std::allocator<key>, typename valuealloc = std::allocator<_value>, typename challoc = std::allocator<uint32_t> > | ||
46 | struct HashProxy | ||
47 | { | ||
48 | friend class Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc>; | ||
49 | private: | ||
50 | HashProxy( Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc> &h, key *k, uint32_t nPos, uint32_t hash ) : | ||
51 | hsh( h ), | ||
52 | pKey( k ), | ||
53 | nPos( nPos ), | ||
54 | hash( hash ), | ||
55 | bFilled( false ) | ||
56 | { | ||
57 | } | ||
58 | |||
59 | HashProxy( Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc> &h, uint32_t nPos, _value *pValue ) : | ||
60 | hsh( h ), | ||
61 | nPos( nPos ), | ||
62 | pValue( pValue ), | ||
63 | bFilled( true ) | ||
64 | { | ||
65 | } | ||
66 | |||
67 | Hash<key, _value, sizecalc, keyalloc, valuealloc, challoc> &hsh; | ||
68 | key *pKey; | ||
69 | uint32_t nPos; | ||
70 | _value *pValue; | ||
71 | uint32_t hash; | ||
72 | bool bFilled; | ||
73 | |||
74 | public: | ||
75 | /** | ||
76 | * Cast operator for HashProxy. | ||
77 | *@returns (value_type &) The value the HashProxy is pointing to. | ||
78 | */ | ||
79 | operator _value &() | ||
80 | { | ||
81 | if( bFilled == false ) | ||
82 | throw HashException( | ||
83 | excodeNotFilled, | ||
84 | "No data assosiated with that key." | ||
85 | ); | ||
86 | return *pValue; | ||
87 | } | ||
88 | |||
89 | /** | ||
90 | * Direct function for retrieving a value out of the HashProxy. | ||
91 | *@returns (value_type &) The value pointed to by this HashProxy. | ||
92 | */ | ||
93 | _value &value() | ||
94 | { | ||
95 | if( bFilled == false ) | ||
96 | throw HashException( | ||
97 | excodeNotFilled, | ||
98 | "No data assosiated with that key." | ||
99 | ); | ||
100 | return *pValue; | ||
101 | } | ||
102 | |||
103 | /** | ||
104 | * Whether this HashProxy points to something real or not. | ||
105 | */ | ||
106 | bool isFilled() | ||
107 | { | ||
108 | return bFilled; | ||
109 | } | ||
110 | |||
111 | /** | ||
112 | * Erase the data pointed to by this HashProxy. | ||
113 | */ | ||
114 | void erase() | ||
115 | { | ||
116 | if( bFilled ) | ||
117 | { | ||
118 | hsh._erase( nPos ); | ||
119 | hsh.onDelete(); | ||
120 | } | ||
121 | } | ||
122 | |||
123 | /** | ||
124 | * Assign data to this point in the hash table. | ||
125 | *@param nval (value_type) the data to assign. | ||
126 | */ | ||
127 | _value operator=( _value nval ) | ||
128 | { | ||
129 | if( bFilled ) | ||
130 | { | ||
131 | hsh.va.destroy( pValue ); | ||
132 | hsh.va.construct( pValue, nval ); | ||
133 | hsh.onUpdate(); | ||
134 | } | ||
135 | else | ||
136 | { | ||
137 | hsh.fill( nPos, *pKey, nval, hash ); | ||
138 | hsh.onInsert(); | ||
139 | } | ||
140 | |||
141 | return nval; | ||
142 | } | ||
143 | |||
144 | /** | ||
145 | * Pointer extraction operator. Access to members of data pointed to | ||
146 | * by HashProxy. | ||
147 | *@returns (value_type *) | ||
148 | */ | ||
149 | _value *operator->() | ||
150 | { | ||
151 | if( bFilled == false ) | ||
152 | throw HashException( | ||
153 | excodeNotFilled, | ||
154 | "No data assosiated with that key." | ||
155 | ); | ||
156 | return pValue; | ||
157 | } | ||
158 | }; | ||
159 | |||
160 | /** | ||
161 | * Libbu Template Hash Table | ||
162 | *@param key (typename) The datatype of the hashtable keys | ||
163 | *@param value (typename) The datatype of the hashtable data | ||
164 | *@param sizecalc (typename) Functor to compute new table size on rehash | ||
165 | *@param keyalloc (typename) Memory allocator for hashtable keys | ||
166 | *@param valuealloc (typename) Memory allocator for hashtable values | ||
167 | *@param challoc (typename) Byte allocator for bitflags | ||
168 | */ | ||
169 | template<typename key, typename value, typename sizecalc, typename keyalloc, typename valuealloc, typename challoc > | ||
170 | class Hash | ||
171 | { | ||
172 | friend struct HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc>; | ||
173 | public: | ||
174 | Hash() : | ||
175 | nCapacity( 11 ), | ||
176 | nFilled( 0 ), | ||
177 | nDeleted( 0 ), | ||
178 | bFilled( NULL ), | ||
179 | bDeleted( NULL ), | ||
180 | aKeys( NULL ), | ||
181 | aValues( NULL ), | ||
182 | aHashCodes( NULL ) | ||
183 | { | ||
184 | nKeysSize = bitsToBytes( nCapacity ); | ||
185 | bFilled = ca.allocate( nKeysSize ); | ||
186 | bDeleted = ca.allocate( nKeysSize ); | ||
187 | clearBits(); | ||
188 | |||
189 | aHashCodes = ca.allocate( nCapacity ); | ||
190 | aKeys = ka.allocate( nCapacity ); | ||
191 | aValues = va.allocate( nCapacity ); | ||
192 | } | ||
193 | |||
194 | Hash( const Hash &src ) : | ||
195 | nCapacity( src.nCapacity ), | ||
196 | nFilled( 0 ), | ||
197 | nDeleted( 0 ), | ||
198 | bFilled( NULL ), | ||
199 | bDeleted( NULL ), | ||
200 | aKeys( NULL ), | ||
201 | aValues( NULL ), | ||
202 | aHashCodes( NULL ) | ||
203 | { | ||
204 | nKeysSize = bitsToBytes( nCapacity ); | ||
205 | bFilled = ca.allocate( nKeysSize ); | ||
206 | bDeleted = ca.allocate( nKeysSize ); | ||
207 | clearBits(); | ||
208 | |||
209 | aHashCodes = ca.allocate( nCapacity ); | ||
210 | aKeys = ka.allocate( nCapacity ); | ||
211 | aValues = va.allocate( nCapacity ); | ||
212 | |||
213 | for( uint32_t j = 0; j < src.nCapacity; j++ ) | ||
214 | { | ||
215 | if( src.isFilled( j ) ) | ||
216 | { | ||
217 | insert( src.aKeys[j], src.aValues[j] ); | ||
218 | } | ||
219 | } | ||
220 | } | ||
221 | |||
222 | /** | ||
223 | * Hashtable assignment operator. Clears this hashtable and | ||
224 | * copies RH into it. | ||
225 | */ | ||
226 | Hash &operator=( const Hash &src ) | ||
227 | { | ||
228 | for( uint32_t j = 0; j < nCapacity; j++ ) | ||
229 | { | ||
230 | if( isFilled( j ) ) | ||
231 | if( !isDeleted( j ) ) | ||
232 | { | ||
233 | va.destroy( &aValues[j] ); | ||
234 | ka.destroy( &aKeys[j] ); | ||
235 | } | ||
236 | } | ||
237 | va.deallocate( aValues, nCapacity ); | ||
238 | ka.deallocate( aKeys, nCapacity ); | ||
239 | ca.deallocate( bFilled, nKeysSize ); | ||
240 | ca.deallocate( bDeleted, nKeysSize ); | ||
241 | ca.deallocate( aHashCodes, nCapacity ); | ||
242 | |||
243 | nFilled = 0; | ||
244 | nDeleted = 0; | ||
245 | nCapacity = src.nCapacity; | ||
246 | nKeysSize = bitsToBytes( nCapacity ); | ||
247 | bFilled = ca.allocate( nKeysSize ); | ||
248 | bDeleted = ca.allocate( nKeysSize ); | ||
249 | clearBits(); | ||
250 | |||
251 | aHashCodes = ca.allocate( nCapacity ); | ||
252 | aKeys = ka.allocate( nCapacity ); | ||
253 | aValues = va.allocate( nCapacity ); | ||
254 | |||
255 | for( uint32_t j = 0; j < src.nCapacity; j++ ) | ||
256 | { | ||
257 | if( src.isFilled( j ) ) | ||
258 | { | ||
259 | insert( src.aKeys[j], src.aValues[j] ); | ||
260 | } | ||
261 | } | ||
262 | |||
263 | return *this; | ||
264 | } | ||
265 | |||
266 | virtual ~Hash() | ||
267 | { | ||
268 | for( uint32_t j = 0; j < nCapacity; j++ ) | ||
269 | { | ||
270 | if( isFilled( j ) ) | ||
271 | if( !isDeleted( j ) ) | ||
272 | { | ||
273 | va.destroy( &aValues[j] ); | ||
274 | ka.destroy( &aKeys[j] ); | ||
275 | } | ||
276 | } | ||
277 | va.deallocate( aValues, nCapacity ); | ||
278 | ka.deallocate( aKeys, nCapacity ); | ||
279 | ca.deallocate( bFilled, nKeysSize ); | ||
280 | ca.deallocate( bDeleted, nKeysSize ); | ||
281 | ca.deallocate( aHashCodes, nCapacity ); | ||
282 | } | ||
283 | |||
284 | /** | ||
285 | * Get the current hash table capacity. (Changes at re-hash) | ||
286 | *@returns (uint32_t) The current capacity. | ||
287 | */ | ||
288 | uint32_t getCapacity() | ||
289 | { | ||
290 | return nCapacity; | ||
291 | } | ||
292 | |||
293 | /** | ||
294 | * Get the number of hash locations spoken for. (Including | ||
295 | * not-yet-cleaned-up deleted items.) | ||
296 | *@returns (uint32_t) The current fill state. | ||
297 | */ | ||
298 | uint32_t getFill() | ||
299 | { | ||
300 | return nFilled; | ||
301 | } | ||
302 | |||
303 | /** | ||
304 | * Get the number of items stored in the hash table. | ||
305 | *@returns (uint32_t) The number of items stored in the hash table. | ||
306 | */ | ||
307 | uint32_t size() | ||
308 | { | ||
309 | return nFilled-nDeleted; | ||
310 | } | ||
311 | |||
312 | /** | ||
313 | * Get the number of items which have been deleted, but not yet | ||
314 | * cleaned up. | ||
315 | *@returns (uint32_t) The number of deleted items. | ||
316 | */ | ||
317 | uint32_t getDeleted() | ||
318 | { | ||
319 | return nDeleted; | ||
320 | } | ||
321 | |||
322 | /** | ||
323 | * Hash table index operator | ||
324 | *@param k (key_type) Key of data to be retrieved. | ||
325 | *@returns (HashProxy) Proxy pointing to the data. | ||
326 | */ | ||
327 | virtual HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc> operator[]( key k ) | ||
328 | { | ||
329 | uint32_t hash = __calcHashCode( k ); | ||
330 | bool bFill; | ||
331 | uint32_t nPos = probe( hash, k, bFill ); | ||
332 | |||
333 | if( bFill ) | ||
334 | { | ||
335 | return HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc>( *this, nPos, &aValues[nPos] ); | ||
336 | } | ||
337 | else | ||
338 | { | ||
339 | return HashProxy<key, value, sizecalc, keyalloc, valuealloc, challoc>( *this, &k, nPos, hash ); | ||
340 | } | ||
341 | } | ||
342 | |||
343 | /** | ||
344 | * Insert a value (v) under key (k) into the hash table | ||
345 | *@param k (key_type) Key to list the value under. | ||
346 | *@param v (value_type) Value to store in the hash table. | ||
347 | */ | ||
348 | virtual void insert( key k, value v ) | ||
349 | { | ||
350 | uint32_t hash = __calcHashCode( k ); | ||
351 | bool bFill; | ||
352 | uint32_t nPos = probe( hash, k, bFill ); | ||
353 | |||
354 | if( bFill ) | ||
355 | { | ||
356 | va.destroy( &aValues[nPos] ); | ||
357 | va.construct( &aValues[nPos], v ); | ||
358 | onUpdate(); | ||
359 | } | ||
360 | else | ||
361 | { | ||
362 | fill( nPos, k, v, hash ); | ||
363 | onInsert(); | ||
364 | } | ||
365 | } | ||
366 | |||
367 | /** | ||
368 | * Remove a value from the hash table. | ||
369 | *@param k (key_type) The data under this key will be erased. | ||
370 | */ | ||
371 | virtual void erase( key k ) | ||
372 | { | ||
373 | uint32_t hash = __calcHashCode( k ); | ||
374 | bool bFill; | ||
375 | uint32_t nPos = probe( hash, k, bFill ); | ||
376 | |||
377 | if( bFill ) | ||
378 | { | ||
379 | _erase( nPos ); | ||
380 | onDelete(); | ||
381 | } | ||
382 | } | ||
383 | |||
384 | struct iterator; | ||
385 | |||
386 | /** | ||
387 | * Remove a value from the hash pointed to from an iterator. | ||
388 | *@param i (iterator &) The data to be erased. | ||
389 | */ | ||
390 | virtual void erase( struct iterator &i ) | ||
391 | { | ||
392 | if( this != &i.hsh ) | ||
393 | throw HashException("This iterator didn't come from this Hash."); | ||
394 | if( isFilled( i.nPos ) && !isDeleted( i.nPos ) ) | ||
395 | { | ||
396 | _erase( i.nPos ); | ||
397 | onDelete(); | ||
398 | } | ||
399 | } | ||
400 | |||
401 | /** | ||
402 | * Remove all data from the hash table. | ||
403 | */ | ||
404 | virtual void clear() | ||
405 | { | ||
406 | for( uint32_t j = 0; j < nCapacity; j++ ) | ||
407 | { | ||
408 | if( isFilled( j ) ) | ||
409 | if( !isDeleted( j ) ) | ||
410 | { | ||
411 | va.destroy( &aValues[j] ); | ||
412 | ka.destroy( &aKeys[j] ); | ||
413 | onDelete(); | ||
414 | } | ||
415 | } | ||
416 | |||
417 | clearBits(); | ||
418 | } | ||
419 | |||
420 | /** | ||
421 | * Get an item of data from the hash table. | ||
422 | *@param k (key_type) Key pointing to the data to be retrieved. | ||
423 | *@returns (value_type &) The data pointed to by (k). | ||
424 | */ | ||
425 | virtual value &get( key k ) | ||
426 | { | ||
427 | uint32_t hash = __calcHashCode( k ); | ||
428 | bool bFill; | ||
429 | uint32_t nPos = probe( hash, k, bFill ); | ||
430 | |||
431 | if( bFill ) | ||
432 | { | ||
433 | return aValues[nPos]; | ||
434 | } | ||
435 | else | ||
436 | { | ||
437 | throw HashException( | ||
438 | excodeNotFilled, | ||
439 | "No data assosiated with that key." | ||
440 | ); | ||
441 | } | ||
442 | } | ||
443 | |||
444 | /** | ||
445 | * Get a const item of data from the hash table. | ||
446 | *@param k (key_type) Key pointing to the data to be retrieved. | ||
447 | *@returns (const value_type &) A const version of the data pointed | ||
448 | * to by (k). | ||
449 | */ | ||
450 | virtual const value &get( key k ) const | ||
451 | { | ||
452 | uint32_t hash = __calcHashCode( k ); | ||
453 | bool bFill; | ||
454 | uint32_t nPos = probe( hash, k, bFill ); | ||
455 | |||
456 | if( bFill ) | ||
457 | { | ||
458 | return aValues[nPos]; | ||
459 | } | ||
460 | else | ||
461 | { | ||
462 | throw HashException( | ||
463 | excodeNotFilled, | ||
464 | "No data assosiated with that key." | ||
465 | ); | ||
466 | } | ||
467 | } | ||
468 | |||
469 | /** | ||
470 | * Does the hash table contain an item under key (k). | ||
471 | *@param k (key_type) The key to check. | ||
472 | *@returns (bool) Whether there was an item in the hash under key (k). | ||
473 | */ | ||
474 | virtual bool has( key k ) | ||
475 | { | ||
476 | bool bFill; | ||
477 | probe( __calcHashCode( k ), k, bFill, false ); | ||
478 | |||
479 | return bFill; | ||
480 | } | ||
481 | |||
482 | /** | ||
483 | * Iteration structure for iterating through the hash. | ||
484 | */ | ||
485 | typedef struct iterator | ||
486 | { | ||
487 | friend class Hash<key, value, sizecalc, keyalloc, valuealloc, challoc>; | ||
488 | private: | ||
489 | iterator( Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh ) : | ||
490 | hsh( hsh ), | ||
491 | nPos( 0 ), | ||
492 | bFinished( false ) | ||
493 | { | ||
494 | nPos = hsh.getFirstPos( bFinished ); | ||
495 | } | ||
496 | |||
497 | iterator( Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh, bool bDone ) : | ||
498 | hsh( hsh ), | ||
499 | nPos( 0 ), | ||
500 | bFinished( bDone ) | ||
501 | { | ||
502 | } | ||
503 | |||
504 | Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh; | ||
505 | uint32_t nPos; | ||
506 | bool bFinished; | ||
507 | |||
508 | public: | ||
509 | /** | ||
510 | * Iterator incrementation operator. Move the iterator forward. | ||
511 | */ | ||
512 | iterator operator++( int ) | ||
513 | { | ||
514 | if( bFinished == false ) | ||
515 | nPos = hsh.getNextPos( nPos, bFinished ); | ||
516 | |||
517 | return *this; | ||
518 | } | ||
519 | |||
520 | /** | ||
521 | * Iterator incrementation operator. Move the iterator forward. | ||
522 | */ | ||
523 | iterator operator++() | ||
524 | { | ||
525 | if( bFinished == false ) | ||
526 | nPos = hsh.getNextPos( nPos, bFinished ); | ||
527 | |||
528 | return *this; | ||
529 | } | ||
530 | |||
531 | /** | ||
532 | * Iterator equality comparison operator. Iterators the same? | ||
533 | */ | ||
534 | bool operator==( const iterator &oth ) | ||
535 | { | ||
536 | if( bFinished != oth.bFinished ) | ||
537 | return false; | ||
538 | if( bFinished == true ) | ||
539 | { | ||
540 | return true; | ||
541 | } | ||
542 | else | ||
543 | { | ||
544 | if( oth.nPos == nPos ) | ||
545 | return true; | ||
546 | return false; | ||
547 | } | ||
548 | } | ||
549 | |||
550 | /** | ||
551 | * Iterator not equality comparison operator. Not the same? | ||
552 | */ | ||
553 | bool operator!=( const iterator &oth ) | ||
554 | { | ||
555 | return !(*this == oth ); | ||
556 | } | ||
557 | |||
558 | /** | ||
559 | * Iterator assignment operator. | ||
560 | */ | ||
561 | iterator operator=( const iterator &oth ) | ||
562 | { | ||
563 | if( &hsh != &oth.hsh ) | ||
564 | throw HashException( | ||
565 | "Cannot mix iterators from different hash objects."); | ||
566 | nPos = oth.nPos; | ||
567 | bFinished = oth.bFinished; | ||
568 | } | ||
569 | |||
570 | /** | ||
571 | * Iterator dereference operator... err.. get the value | ||
572 | *@returns (value_type &) The value behind this iterator. | ||
573 | */ | ||
574 | value &operator *() | ||
575 | { | ||
576 | return hsh.getValueAtPos( nPos ); | ||
577 | } | ||
578 | |||
579 | /** | ||
580 | * Get the key behind this iterator. | ||
581 | *@returns (key_type &) The key behind this iterator. | ||
582 | */ | ||
583 | key &getKey() | ||
584 | { | ||
585 | return hsh.getKeyAtPos( nPos ); | ||
586 | } | ||
587 | |||
588 | /** | ||
589 | * Get the value behind this iterator. | ||
590 | *@returs (value_type &) The value behind this iterator. | ||
591 | */ | ||
592 | value &getValue() | ||
593 | { | ||
594 | return hsh.getValueAtPos( nPos ); | ||
595 | } | ||
596 | }; | ||
597 | |||
598 | /** | ||
599 | * Iteration structure for iterating through the hash (const). | ||
600 | */ | ||
601 | typedef struct const_iterator | ||
602 | { | ||
603 | friend class Hash<key, value, sizecalc, keyalloc, valuealloc, challoc>; | ||
604 | private: | ||
605 | const_iterator( const Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh ) : | ||
606 | hsh( hsh ), | ||
607 | nPos( 0 ), | ||
608 | bFinished( false ) | ||
609 | { | ||
610 | nPos = hsh.getFirstPos( bFinished ); | ||
611 | } | ||
612 | |||
613 | const_iterator( const Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh, bool bDone ) : | ||
614 | hsh( hsh ), | ||
615 | nPos( 0 ), | ||
616 | bFinished( bDone ) | ||
617 | { | ||
618 | } | ||
619 | |||
620 | const Hash<key, value, sizecalc, keyalloc, valuealloc, challoc> &hsh; | ||
621 | uint32_t nPos; | ||
622 | bool bFinished; | ||
623 | |||
624 | public: | ||
625 | /** | ||
626 | * Iterator incrementation operator. Move the iterator forward. | ||
627 | */ | ||
628 | const_iterator operator++( int ) | ||
629 | { | ||
630 | if( bFinished == false ) | ||
631 | nPos = hsh.getNextPos( nPos, bFinished ); | ||
632 | |||
633 | return *this; | ||
634 | } | ||
635 | |||
636 | /** | ||
637 | * Iterator incrementation operator. Move the iterator forward. | ||
638 | */ | ||
639 | const_iterator operator++() | ||
640 | { | ||
641 | if( bFinished == false ) | ||
642 | nPos = hsh.getNextPos( nPos, bFinished ); | ||
643 | |||
644 | return *this; | ||
645 | } | ||
646 | |||
647 | /** | ||
648 | * Iterator equality comparison operator. Iterators the same? | ||
649 | */ | ||
650 | bool operator==( const const_iterator &oth ) | ||
651 | { | ||
652 | if( bFinished != oth.bFinished ) | ||
653 | return false; | ||
654 | if( bFinished == true ) | ||
655 | { | ||
656 | return true; | ||
657 | } | ||
658 | else | ||
659 | { | ||
660 | if( oth.nPos == nPos ) | ||
661 | return true; | ||
662 | return false; | ||
663 | } | ||
664 | } | ||
665 | |||
666 | /** | ||
667 | * Iterator not equality comparison operator. Not the same? | ||
668 | */ | ||
669 | bool operator!=( const const_iterator &oth ) | ||
670 | { | ||
671 | return !(*this == oth ); | ||
672 | } | ||
673 | |||
674 | /** | ||
675 | * Iterator assignment operator. | ||
676 | */ | ||
677 | const_iterator operator=( const const_iterator &oth ) | ||
678 | { | ||
679 | if( &hsh != &oth.hsh ) | ||
680 | throw HashException( | ||
681 | "Cannot mix iterators from different hash objects."); | ||
682 | nPos = oth.nPos; | ||
683 | bFinished = oth.bFinished; | ||
684 | } | ||
685 | |||
686 | /** | ||
687 | * Iterator dereference operator... err.. get the value | ||
688 | *@returns (value_type &) The value behind this iterator. | ||
689 | */ | ||
690 | const value &operator *() const | ||
691 | { | ||
692 | return hsh.getValueAtPos( nPos ); | ||
693 | } | ||
694 | |||
695 | /** | ||
696 | * Get the key behind this iterator. | ||
697 | *@returns (key_type &) The key behind this iterator. | ||
698 | */ | ||
699 | const key &getKey() const | ||
700 | { | ||
701 | return hsh.getKeyAtPos( nPos ); | ||
702 | } | ||
703 | |||
704 | /** | ||
705 | * Get the value behind this iterator. | ||
706 | *@returs (value_type &) The value behind this iterator. | ||
707 | */ | ||
708 | const value &getValue() const | ||
709 | { | ||
710 | return hsh.getValueAtPos( nPos ); | ||
711 | } | ||
712 | }; | ||
713 | |||
714 | /** | ||
715 | * Get an iterator pointing to the first item in the hash table. | ||
716 | *@returns (iterator) An iterator pointing to the first item in the | ||
717 | * hash table. | ||
718 | */ | ||
719 | iterator begin() | ||
720 | { | ||
721 | return iterator( *this ); | ||
722 | } | ||
723 | |||
724 | const_iterator begin() const | ||
725 | { | ||
726 | return const_iterator( *this ); | ||
727 | } | ||
728 | |||
729 | /** | ||
730 | * Get an iterator pointing to a point just past the last item in the | ||
731 | * hash table. | ||
732 | *@returns (iterator) An iterator pointing to a point just past the | ||
733 | * last item in the hash table. | ||
734 | */ | ||
735 | iterator end() | ||
736 | { | ||
737 | return iterator( *this, true ); | ||
738 | } | ||
739 | |||
740 | const_iterator end() const | ||
741 | { | ||
742 | return const_iterator( *this, true ); | ||
743 | } | ||
744 | |||
745 | /** | ||
746 | * Get a list of all the keys in the hash table. | ||
747 | *@returns (std::list<key_type>) The list of keys in the hash table. | ||
748 | */ | ||
749 | Bu::List<key> getKeys() const | ||
750 | { | ||
751 | Bu::List<key> lKeys; | ||
752 | |||
753 | for( uint32_t j = 0; j < nCapacity; j++ ) | ||
754 | { | ||
755 | if( isFilled( j ) ) | ||
756 | { | ||
757 | if( !isDeleted( j ) ) | ||
758 | { | ||
759 | lKeys.append( aKeys[j] ); | ||
760 | } | ||
761 | } | ||
762 | } | ||
763 | |||
764 | return lKeys; | ||
765 | } | ||
766 | |||
767 | protected: | ||
768 | virtual void onInsert() {} | ||
769 | virtual void onUpdate() {} | ||
770 | virtual void onDelete() {} | ||
771 | virtual void onReHash() {} | ||
772 | |||
773 | virtual void clearBits() | ||
774 | { | ||
775 | for( uint32_t j = 0; j < nKeysSize; j++ ) | ||
776 | { | ||
777 | bFilled[j] = bDeleted[j] = 0; | ||
778 | } | ||
779 | } | ||
780 | |||
781 | virtual void fill( uint32_t loc, key &k, value &v, uint32_t hash ) | ||
782 | { | ||
783 | bFilled[loc/32] |= (1<<(loc%32)); | ||
784 | va.construct( &aValues[loc], v ); | ||
785 | ka.construct( &aKeys[loc], k ); | ||
786 | aHashCodes[loc] = hash; | ||
787 | nFilled++; | ||
788 | //printf("Filled: %d, Deleted: %d, Capacity: %d\n", | ||
789 | // nFilled, nDeleted, nCapacity ); | ||
790 | } | ||
791 | |||
792 | virtual void _erase( uint32_t loc ) | ||
793 | { | ||
794 | bDeleted[loc/32] |= (1<<(loc%32)); | ||
795 | va.destroy( &aValues[loc] ); | ||
796 | ka.destroy( &aKeys[loc] ); | ||
797 | nDeleted++; | ||
798 | //printf("Filled: %d, Deleted: %d, Capacity: %d\n", | ||
799 | // nFilled, nDeleted, nCapacity ); | ||
800 | } | ||
801 | |||
802 | virtual std::pair<key,value> getAtPos( uint32_t nPos ) | ||
803 | { | ||
804 | return std::pair<key,value>(aKeys[nPos],aValues[nPos]); | ||
805 | } | ||
806 | |||
807 | virtual key &getKeyAtPos( uint32_t nPos ) | ||
808 | { | ||
809 | return aKeys[nPos]; | ||
810 | } | ||
811 | |||
812 | virtual const key &getKeyAtPos( uint32_t nPos ) const | ||
813 | { | ||
814 | return aKeys[nPos]; | ||
815 | } | ||
816 | |||
817 | virtual value &getValueAtPos( uint32_t nPos ) | ||
818 | { | ||
819 | return aValues[nPos]; | ||
820 | } | ||
821 | |||
822 | virtual const value &getValueAtPos( uint32_t nPos ) const | ||
823 | { | ||
824 | return aValues[nPos]; | ||
825 | } | ||
826 | |||
827 | virtual uint32_t getFirstPos( bool &bFinished ) const | ||
828 | { | ||
829 | for( uint32_t j = 0; j < nCapacity; j++ ) | ||
830 | { | ||
831 | if( isFilled( j ) ) | ||
832 | if( !isDeleted( j ) ) | ||
833 | return j; | ||
834 | } | ||
835 | |||
836 | bFinished = true; | ||
837 | return 0; | ||
838 | } | ||
839 | |||
840 | virtual uint32_t getNextPos( uint32_t nPos, bool &bFinished ) const | ||
841 | { | ||
842 | for( uint32_t j = nPos+1; j < nCapacity; j++ ) | ||
843 | { | ||
844 | if( isFilled( j ) ) | ||
845 | if( !isDeleted( j ) ) | ||
846 | return j; | ||
847 | } | ||
848 | |||
849 | bFinished = true; | ||
850 | return 0; | ||
851 | } | ||
852 | |||
853 | uint32_t probe( uint32_t hash, key k, bool &bFill, bool rehash=true ) | ||
854 | { | ||
855 | uint32_t nCur = hash%nCapacity; | ||
856 | |||
857 | // First we scan to see if the key is already there, abort if we | ||
858 | // run out of probing room, or we find a non-filled entry | ||
859 | int8_t j; | ||
860 | for( j = 0; | ||
861 | isFilled( nCur ) && j < 32; | ||
862 | nCur = (nCur + (1<<j))%nCapacity, j++ | ||
863 | ) | ||
864 | { | ||
865 | // Is this the same hash code we were looking for? | ||
866 | if( hash == aHashCodes[nCur] ) | ||
867 | { | ||
868 | // Skip over deleted entries. Deleted entries are also filled, | ||
869 | // so we only have to do this check here. | ||
870 | if( isDeleted( nCur ) ) | ||
871 | continue; | ||
872 | |||
873 | // Is it really the same key? (for safety) | ||
874 | if( __cmpHashKeys( aKeys[nCur], k ) == true ) | ||
875 | { | ||
876 | bFill = true; | ||
877 | return nCur; | ||
878 | } | ||
879 | } | ||
880 | } | ||
881 | |||
882 | // This is our insurance, if the table is full, then go ahead and | ||
883 | // rehash, then try again. | ||
884 | if( (isFilled( nCur ) || j == 32) && rehash == true ) | ||
885 | { | ||
886 | reHash( szCalc(getCapacity(), getFill(), getDeleted()) ); | ||
887 | |||
888 | // This is potentially dangerous, and could cause an infinite loop. | ||
889 | // Be careful writing probe, eh? | ||
890 | return probe( hash, k, bFill ); | ||
891 | } | ||
892 | |||
893 | bFill = false; | ||
894 | return nCur; | ||
895 | } | ||
896 | |||
897 | uint32_t probe( uint32_t hash, key k, bool &bFill, bool rehash=true ) const | ||
898 | { | ||
899 | uint32_t nCur = hash%nCapacity; | ||
900 | |||
901 | // First we scan to see if the key is already there, abort if we | ||
902 | // run out of probing room, or we find a non-filled entry | ||
903 | for( int8_t j = 0; | ||
904 | isFilled( nCur ) && j < 32; | ||
905 | nCur = (nCur + (1<<j))%nCapacity, j++ | ||
906 | ) | ||
907 | { | ||
908 | // Is this the same hash code we were looking for? | ||
909 | if( hash == aHashCodes[nCur] ) | ||
910 | { | ||
911 | // Skip over deleted entries. Deleted entries are also filled, | ||
912 | // so we only have to do this check here. | ||
913 | if( isDeleted( nCur ) ) | ||
914 | continue; | ||
915 | |||
916 | // Is it really the same key? (for safety) | ||
917 | if( __cmpHashKeys( aKeys[nCur], k ) == true ) | ||
918 | { | ||
919 | bFill = true; | ||
920 | return nCur; | ||
921 | } | ||
922 | } | ||
923 | } | ||
924 | |||
925 | bFill = false; | ||
926 | return nCur; | ||
927 | } | ||
928 | |||
929 | void reHash( uint32_t nNewSize ) | ||
930 | { | ||
931 | //printf("---REHASH---"); | ||
932 | //printf("Filled: %d, Deleted: %d, Capacity: %d\n", | ||
933 | // nFilled, nDeleted, nCapacity ); | ||
934 | |||
935 | // Save all the old data | ||
936 | uint32_t nOldCapacity = nCapacity; | ||
937 | uint32_t *bOldFilled = bFilled; | ||
938 | uint32_t *aOldHashCodes = aHashCodes; | ||
939 | uint32_t nOldKeysSize = nKeysSize; | ||
940 | uint32_t *bOldDeleted = bDeleted; | ||
941 | value *aOldValues = aValues; | ||
942 | key *aOldKeys = aKeys; | ||
943 | |||
944 | // Calculate new sizes | ||
945 | nCapacity = nNewSize; | ||
946 | nKeysSize = bitsToBytes( nCapacity ); | ||
947 | |||
948 | // Allocate new memory + prep | ||
949 | bFilled = ca.allocate( nKeysSize ); | ||
950 | bDeleted = ca.allocate( nKeysSize ); | ||
951 | clearBits(); | ||
952 | |||
953 | aHashCodes = ca.allocate( nCapacity ); | ||
954 | aKeys = ka.allocate( nCapacity ); | ||
955 | aValues = va.allocate( nCapacity ); | ||
956 | |||
957 | nDeleted = nFilled = 0; | ||
958 | |||
959 | // Re-insert all of the old data (except deleted items) | ||
960 | for( uint32_t j = 0; j < nOldCapacity; j++ ) | ||
961 | { | ||
962 | if( (bOldFilled[j/32]&(1<<(j%32)))!=0 && | ||
963 | (bOldDeleted[j/32]&(1<<(j%32)))==0 ) | ||
964 | { | ||
965 | insert( aOldKeys[j], aOldValues[j] ); | ||
966 | } | ||
967 | } | ||
968 | |||
969 | // Delete all of the old data | ||
970 | for( uint32_t j = 0; j < nOldCapacity; j++ ) | ||
971 | { | ||
972 | if( (bOldFilled[j/32]&(1<<(j%32)))!=0 ) | ||
973 | { | ||
974 | va.destroy( &aOldValues[j] ); | ||
975 | ka.destroy( &aOldKeys[j] ); | ||
976 | } | ||
977 | } | ||
978 | va.deallocate( aOldValues, nOldCapacity ); | ||
979 | ka.deallocate( aOldKeys, nOldCapacity ); | ||
980 | ca.deallocate( bOldFilled, nOldKeysSize ); | ||
981 | ca.deallocate( bOldDeleted, nOldKeysSize ); | ||
982 | ca.deallocate( aOldHashCodes, nOldCapacity ); | ||
983 | } | ||
984 | |||
985 | virtual bool isFilled( uint32_t loc ) const | ||
986 | { | ||
987 | return (bFilled[loc/32]&(1<<(loc%32)))!=0; | ||
988 | } | ||
989 | |||
990 | virtual bool isDeleted( uint32_t loc ) const | ||
991 | { | ||
992 | return (bDeleted[loc/32]&(1<<(loc%32)))!=0; | ||
993 | } | ||
994 | |||
995 | protected: | ||
996 | uint32_t nCapacity; | ||
997 | uint32_t nFilled; | ||
998 | uint32_t nDeleted; | ||
999 | uint32_t *bFilled; | ||
1000 | uint32_t *bDeleted; | ||
1001 | uint32_t nKeysSize; | ||
1002 | key *aKeys; | ||
1003 | value *aValues; | ||
1004 | uint32_t *aHashCodes; | ||
1005 | valuealloc va; | ||
1006 | keyalloc ka; | ||
1007 | challoc ca; | ||
1008 | sizecalc szCalc; | ||
1009 | }; | ||
1010 | |||
1011 | template<> uint32_t __calcHashCode<int>( const int &k ); | ||
1012 | template<> bool __cmpHashKeys<int>( const int &a, const int &b ); | ||
1013 | |||
1014 | template<> uint32_t __calcHashCode<unsigned int>( const unsigned int &k ); | ||
1015 | template<> bool __cmpHashKeys<unsigned int>( const unsigned int &a, const unsigned int &b ); | ||
1016 | |||
1017 | template<> uint32_t __calcHashCode<const char *>( const char * const &k ); | ||
1018 | template<> bool __cmpHashKeys<const char *>( const char * const &a, const char * const &b ); | ||
1019 | |||
1020 | template<> uint32_t __calcHashCode<char *>( char * const &k ); | ||
1021 | template<> bool __cmpHashKeys<char *>( char * const &a, char * const &b ); | ||
1022 | |||
1023 | template<> uint32_t __calcHashCode<std::string>( const std::string &k ); | ||
1024 | template<> bool __cmpHashKeys<std::string>( const std::string &a, const std::string &b ); | ||
1025 | |||
1026 | /* | ||
1027 | template<typename key, typename value> | ||
1028 | Archive &operator<<( Archive &ar, Hash<key,value> &h ) | ||
1029 | { | ||
1030 | ar << h.size(); | ||
1031 | for( typename Hash<key,value>::iterator i = h.begin(); i != h.end(); i++ ) | ||
1032 | { | ||
1033 | std::pair<key,value> p = *i; | ||
1034 | ar << p.first << p.second; | ||
1035 | } | ||
1036 | |||
1037 | return ar; | ||
1038 | } | ||
1039 | |||
1040 | template<typename key, typename value> | ||
1041 | Archive &operator>>( Archive &ar, Hash<key,value> &h ) | ||
1042 | { | ||
1043 | h.clear(); | ||
1044 | uint32_t nSize; | ||
1045 | ar >> nSize; | ||
1046 | |||
1047 | for( uint32_t j = 0; j < nSize; j++ ) | ||
1048 | { | ||
1049 | key k; value v; | ||
1050 | ar >> k >> v; | ||
1051 | h.insert( k, v ); | ||
1052 | } | ||
1053 | |||
1054 | return ar; | ||
1055 | }*/ | ||
1056 | |||
1057 | /* | ||
1058 | template<typename key, typename value> | ||
1059 | Serializer &operator&&( Serializer &ar, Hash<key,value> &h ) | ||
1060 | { | ||
1061 | if( ar.isLoading() ) | ||
1062 | { | ||
1063 | return ar >> h; | ||
1064 | } | ||
1065 | else | ||
1066 | { | ||
1067 | return ar << h; | ||
1068 | } | ||
1069 | }*/ | ||
1070 | } | ||
1071 | |||
1072 | #endif | ||