Annotation of parser3/src/include/pa_hash.h, revision 1.23
1.1 paf 1: /*
1.21 paf 2: Parser
3: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.22 paf 4: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.1 paf 5:
1.23 ! paf 6: $Id: pa_hash.h,v 1.22 2001/03/11 08:16:32 paf Exp $
1.1 paf 7: */
8:
9: #ifndef PA_HASH_H
10: #define PA_HASH_H
11:
12: #include <stddef.h>
13:
1.14 paf 14: #include "pa_pool.h"
1.1 paf 15: #include "pa_types.h"
16: #include "pa_string.h"
17:
1.23 ! paf 18: class Hash : public Pooled {
1.1 paf 19: public:
20:
1.3 paf 21: typedef String Key;
22: typedef void Value;
23:
1.8 paf 24: public:
25:
1.15 paf 26: Hash(Pool& apool,bool) : Pooled(apool) { construct(apool, true); }
27: Hash(Pool& apool) : Pooled(apool) { construct(apool, false); }
1.10 paf 28:
1.8 paf 29: // useful generic hash function
1.19 paf 30: static uint generic_code(uint aresult, const char *start, uint allocated);
1.8 paf 31:
1.18 paf 32: // put a [value] under the [key], return existed or not
33: /*SYNCHRONIZED*/ bool put(const Key& key, Value *value);
1.8 paf 34:
35: // get associated [value] by the [key]
1.15 paf 36: /*SYNCHRONIZED*/ Value *get(const Key& key) const;
1.17 paf 37:
38: // put a [value] under the [key] if that [key] existed, return existed or not
1.18 paf 39: /*SYNCHRONIZED*/ bool put_replace(const Key& key, Value *value);
40:
41: // put a [value] under the [key] if that [key] NOT existed, return existed or not
42: /*SYNCHRONIZED*/ bool put_dont_replace(const Key& key, Value *value);
43:
44: // put all 'src' values if NO with same key existed
45: /*SYNCHRONIZED*/ void merge_dont_replace(const Hash& src);
1.11 paf 46:
1.13 paf 47: void put(const Key& key, int value) { put(key, reinterpret_cast<Value *>(value)); }
48: void put(const Key& key, String *value) { put(key, static_cast<Value *>(value)); }
1.11 paf 49:
1.13 paf 50: int get_int(const Key& key) { return reinterpret_cast<int>(get(key)); }
1.20 paf 51: const String *get_string(const Key& key) { return static_cast<String *>(get(key)); }
1.10 paf 52:
1.19 paf 53: int size() { return used; }
54:
1.15 paf 55: protected:
56:
57: void construct(Pool& apool, bool athread_safe);
58:
1.1 paf 59: private:
60:
1.19 paf 61: // expand when these %% of allocated exausted
1.1 paf 62: enum {
63: THRESHOLD_PERCENT=75
64: };
65:
1.9 paf 66: // am I thread-safe?
67: bool thread_safe;
68:
1.19 paf 69: // the index of [allocated] in [allocates]
70: int allocates_index;
1.1 paf 71:
1.19 paf 72: // possible [allocates]. prime numbers
73: static uint allocates[];
74: static int allocates_count;
1.1 paf 75:
76: // number of allocated pairs
1.19 paf 77: int allocated;
1.1 paf 78:
79: // helper: expanding when used == threshold
80: int threshold;
81:
82: // used pairs
83: int used;
84:
85: // main storage
86: class Pair {
1.2 paf 87: friend Hash;
88:
1.1 paf 89: uint code;
1.15 paf 90: const Key key;
1.1 paf 91: Value *value;
92: Pair *link;
1.2 paf 93:
1.19 paf 94: void *operator new(size_t allocated, Pool& apool);
1.2 paf 95:
1.13 paf 96: Pair(uint acode, const Key& akey, Value *avalue, Pair *alink) :
1.1 paf 97: code(acode),
98: key(akey),
99: value(avalue),
1.2 paf 100: link(alink) {}
101: } **refs;
1.1 paf 102:
1.5 paf 103: // filled to threshold: needs expanding
104: bool full() { return used==threshold; }
105:
106: // allocate larger buffer & rehash
1.1 paf 107: void expand();
1.4 paf 108:
109: private: //disabled
110:
1.11 paf 111: //Hash(Hash&) {}
1.12 paf 112: Hash& operator = (const Hash&) { return *this; }
1.1 paf 113: };
114:
115: #endif
E-mail: