125 lines
5.1 KiB
C++
125 lines
5.1 KiB
C++
/*=============================================================================
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# Filename: Signature.h
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# Author: Bookug Lobert
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# Mail: zengli-bookug@pku.edu.cn
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# Last Modified: 2016-04-11 12:50
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# Description: written by liyouhuan and hanshuo, modified by zengli
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=============================================================================*/
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#ifndef _SIGNATURE_SIGNATURE_H
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#define _SIGNATURE_SIGNATURE_H
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#include "../Util/Util.h"
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class Signature
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{
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public:
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//TODO:how to set the length as a dynamic parameter? below use typedef bitset<num>
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//keep the parameter in Database and passed to here and Query??
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//QUERY: is this really needed?!
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//static HashFunction hash[HashNum];
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static const int PRE_SIG_BASE = 10;
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static const int STR_SIG_BASE = PRE_SIG_BASE;
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static const int STR_SIG_LENGTH = 3 * STR_SIG_BASE;
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static const int ENTITY_SIG_INTERVAL_BASE = PRE_SIG_BASE + STR_SIG_LENGTH;
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static const int EDGE_SIG_INTERVAL_NUM = 5; //in edge or out edge, entity or literal
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static const int ENTITY_SIG_INTERVAL_HALF = 2 * EDGE_SIG_INTERVAL_NUM;
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//STRUCT: in egde | out egde(neighbor is entity | literal(pre1 pre2 pre3 pre4 pre5(str pre * 3) ) )
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//NOTICE: the length should below 1000
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static const int ENTITY_SIG_LENGTH = 2 * 2 * EDGE_SIG_INTERVAL_NUM * ENTITY_SIG_INTERVAL_BASE;
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//NOTICE: we can also use id here, but string is recommended due to special structure
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//(maybe needed later, for example, wildcards)
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//Th ehash function is costly, so just use two
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//static const int HASH_NUM = 3; //no more than Util::HashNum
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//NOTICE:if using str id, we can also divide like EDGE_SIG
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//here we divide as entity neighbors and literal neighbors: ENTITY, LITERAL
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//static const int STR_SIG_LENGTH = 2 * STR_SIG_BASE * HASH_NUM; //250
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//static const int STR_SIG_LENGTH2 = STR_SIG_BASE * HASH_NUM;
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//QUERY:I think that str filter is more important in VSTree than predicate, because
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//a predicate may correspond to a lot of entities and predicate num is usually small
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//static const int EDGE_SIG_INTERVAL_NUM_HALF = 5; //in edge or out edge
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//static const int EDGE_SIG_INTERVAL_NUM = 2 * EDGE_SIG_INTERVAL_NUM_HALF;
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//static const int EDGE_SIG_INTERVAL_BASE = 20;
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//static const int EDGE_SIG_LENGTH = EDGE_SIG_INTERVAL_NUM * EDGE_SIG_INTERVAL_BASE; //150
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//static const int EDGE_SIG_LENGTH2 = EDGE_SIG_INTERVAL_NUM_HALF * EDGE_SIG_INTERVAL_BASE; //150
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//static const int ENTITY_SIG_LENGTH = STR_SIG_LENGTH + EDGE_SIG_LENGTH;
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//static const int ENTITY_SIG_LENGTH = STR_SIG_LENGTH + EDGE_SIG_LENGTH + NEIGHBOR_SIG_LENGTH;
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//typedef std::bitset<Signature::EDGE_SIG_LENGTH2> EdgeBitSet;
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typedef std::bitset<Signature::ENTITY_SIG_LENGTH> EntityBitSet;
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static std::string BitSet2str(const EntityBitSet& _bitset);
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//NOTICE: 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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static void encodeEdge2Entity(EntityBitSet& _entity_bs, int _pre_id, int _neighbor_id, const char _type);
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//Signature()
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//{
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//NOTICE:not exceed the HashNum
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//this->hash = new HashFunction[HashNum];
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//this->hash[0] = Util::simpleHash;
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//this->hash[1] = Util::APHash;
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//this->hash[2] = Util::BKDRHash;
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//this->hash[3] = Util::DJBHash;
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//this->hash[4] = Util::ELFHash;
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//this->hash[5] = Util::DEKHash;
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//this->hash[6] = Util::BPHash;
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//this->hash[7] = Util::FNVHash;
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//this->hash[8] = Util::HFLPHash;
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//this->hash[9] = Util::HFHash;
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//this->hash[10] = Util::JSHash;
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//this->hash[11] = Util::PJWHash;
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//this->hash[12] = Util::RSHash;
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//this->hash[13] = Util::SDBMHash;
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//this->hash[14] = Util::StrHash;
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//this->hash[15] = Util::TianlHash;
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//}
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//~Signature()
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//{
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//delete[] this->hash;
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//}
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};
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//WARN:also defined in Signature, must be same!!!
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//NOTICE:EdgeBitSet is only used in Query, not for VSTree
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//typedef std::bitset<Signature::EDGE_SIG_LENGTH2> EdgeBitSet;
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typedef std::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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std::string to_str() const;
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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_SIGNATURE_H
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