79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Signature.h
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*
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* Created on: 2014-6-20
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* Author: liyouhuan
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* Modified on: 2014-6-29
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* add some private hash functions,
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* fix some ill-formed function names.
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* Author: hanshuo
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*/
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#ifndef SIGNATURE_H_
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#define SIGNATURE_H_
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#include "../Util/Util.h"
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using namespace std;
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class Signature{
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public:
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/* must make sure:
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* ENTITY_SIG_LENGTH = EDGE_SIG_LENGTH + STR_SIG_LENGTH */
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const static int ENTITY_SIG_LENGTH = 400;
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const static int EDGE_SIG_LENGTH = 150;
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const static int STR_SIG_LENGTH = 250;
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typedef bitset<Signature::EDGE_SIG_LENGTH> EdgeBitSet;
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typedef bitset<Signature::ENTITY_SIG_LENGTH> EntityBitSet;
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static std::string BitSet2str(const EntityBitSet& _bitset);
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/* there are two predicate encoding method now, see the encoding functions @Signature.cpp for details. */
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const static int PREDICATE_ENCODE_METHOD = 1;
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static void encodePredicate2Entity(int _pre_id, EntityBitSet& _entity_bs, const char _type);
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static void encodePredicate2Edge(int _pre_id, EdgeBitSet& _edge_bs);
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static void encodeStr2Entity(const char* _str, EntityBitSet& _entity_bs); //_str is subject or object(literal)
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static void encodeStrID2Entity(int _str_id, EntityBitSet& _entity_bs);
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unsigned int hash(const char* _str);
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private:
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static unsigned int BKDRHash(const char *_str);
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static unsigned int simpleHash(const char *_str);
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static unsigned int RSHash(const char *_str);
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static unsigned int JSHash(const char *_str);
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static unsigned int PJWHash(const char *_str);
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static unsigned int ELFHash(const char *_str);
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static unsigned int SDBMHash(const char *_str);
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static unsigned int DJBHash(const char *_str);
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static unsigned int APHash(const char *_str);
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};
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typedef bitset<Signature::EDGE_SIG_LENGTH> EdgeBitSet;
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typedef bitset<Signature::ENTITY_SIG_LENGTH> EntityBitSet;
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class EntitySig : Signature{
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public:
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EntityBitSet entityBitSet;
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EntitySig();
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EntitySig(const EntitySig* _p_sig);
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EntitySig(const EntitySig& _sig);
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EntitySig(const EntityBitSet& _bitset);
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EntitySig& operator|=(const EntitySig& _sig);
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bool operator==(const EntitySig& _sig)const;
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bool operator!=(const EntitySig& _sig)const;
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EntitySig& operator=(const EntitySig& _sig);
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const EntityBitSet& getBitset()const;
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void encode(const char * _str, int _pre_id);
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};
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class EdgeSig : Signature{
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public:
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EdgeBitSet edgeBitSet;
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EdgeSig();
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EdgeSig(const EdgeSig* _p_sig);
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EdgeSig(const EdgeSig& _sig);
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EdgeSig(const EdgeBitSet& _bitset);
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EdgeSig& operator|=(const EdgeSig& _sig);
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};
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#endif /* SIGNATURE_H_ */
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