NVHash Class Reference

#include <NVHash.h>

Inheritance diagram for NVHash:

List of all members.

Public Member Functions
	NVHash ()
	NVHash (const char *dbname, unsigned long hashsz=97, int flags=0)
void	open (const char *dbname, unsigned long hashsz=97, int flags=0)
unsigned long	gethashsz (void)
void	clear (void)
int	is_empty (void)
void	add (unsigned long h, const char *data, size_t szdata)
void	print (std::ostream &os)
Protected Member Functions
void	make_current (void)
int	sis_empty (void)
void	sclear (void)
void	sadd (unsigned long h, const char *data, size_t szdata)
void	sprint (std::ostream &os)
Protected Attributes
nvoff_t *	hashtab
unsigned long	hashsz

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Detailed Description

Author:

Thomas Gschwind

Bug:

Documentation is missing.

Definition at line 15 of file NVHash.h.

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Constructor & Destructor Documentation

NVHash::NVHash (   )  [inline]

Definition at line 29 of file NVHash.h. :NVlist() { } NVHash(const char *dbname, unsigned long hashsz = 97, int flags =

NVHash::NVHash (  const char *  dbname, unsigned long  hashsz = 97, int  flags = 0 )

Definition at line 56 of file NVHash.cc. References open(). :NVlist() { open(dbname, hashsz, flags); }

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Member Function Documentation

void NVHash::add (  unsigned long  h, const char *  data, size_t  szdata )

Definition at line 105 of file NVHash.cc. References NVcontainer::lock(), and sadd(). Referenced by NVActiveDB::add(), and NVActiveDB::sset(). { lock(ExclLock); sadd(h, data, szdata); lock(UnLock); }

void NVHash::clear (  void   )

Reimplemented in NVActiveDB. Definition at line 89 of file NVHash.cc. References NVcontainer::lock(), and sclear(). Referenced by NVActiveDB::clear(). { lock(ExclLock); sclear(); lock(UnLock); }

unsigned long NVHash::gethashsz (  void   )  [inline]

Returns the size of the has-table. Returns: size of the hash table Definition at line 46 of file NVHash.h. References hashsz. { // No lock and make_current invocation necessary, since // the hash-size must not change return hashsz; }

int NVHash::is_empty (  void   )

Reimplemented in NVActiveDB. Definition at line 96 of file NVHash.cc. References NVcontainer::lock(), and sis_empty(). Referenced by NVActiveDB::is_empty(). { int r; lock(ShrdLock); r = sis_empty(); lock(UnLock); return r; }

void NVHash::make_current (  void   )  [protected, virtual]

Reimplemented from NVcontainer. Definition at line 10 of file NVHash.cc. References NVcontainer::getdata(), hashsz, hashtab, NVcontainer::is_current(), NVcontainer::make_current(), and nvoff_t. { nvoff_t hdata; if (mem_p && is_current()) return; NVlist::make_current(); if ((hdata = getdata()) == 0) { hashtab = NULL; hashsz = 0; } else { hashtab = (nvoff_t *) (mem_p + hdata + sizeof(unsigned long)); hashsz = *(unsigned long *) (mem_p + hdata); } }

void NVHash::open (  const char *  dbname, unsigned long  hashsz = 97, int  flags = 0 )

Open an NVHash object. Parameters: dbname  Name of the file, where the hash-table is stored. hashsz  Size of the hash-table, if a new one is created. flags  Ignored at the moment. Definition at line 62 of file NVHash.cc. References hashsz, hashtab, NVcontainer::lock(), NVcontainer::nvalloc(), nvoff_t, NVcontainer::open(), and NVcontainer::setdata(). Referenced by NVHash(), and NVActiveDB::open(). { NVlist::open(dbname, flags); if (!hashtab) { lock(ExclLock); if (!hashtab) { nvoff_t ht = nvalloc(sizeof(unsigned long) + nhashsz * sizeof(nvoff_t)); unsigned long i; setdata(ht); hashsz = (*(unsigned long *) (mem_p + ht)) = nhashsz; hashtab = (nvoff_t *) (mem_p + ht + sizeof(unsigned long)); for (i = 0; i < hashsz; i++) hashtab[i] = 0; } lock(UnLock); } // The hashsz and hashtab variables will be updated at the next // make_current method-invocation }

void NVHash::print (  std::ostream &  os  )

Definition at line 112 of file NVHash.cc. References NVcontainer::lock(), and sprint(). { lock(ShrdLock); sprint(os); lock(UnLock); }

void NVHash::sadd (  unsigned long  h, const char *  data, size_t  szdata )  [protected]

Definition at line 44 of file NVHash.cc. References hashtab, and NVlist::sprepend(). Referenced by add(). { NVlist::sprepend((char *) &(hashtab[h]) - mem_p, data, szdata); }

void NVHash::sclear (  void   )  [protected]

Definition at line 28 of file NVHash.cc. References hashsz, hashtab, and NVlist::sclear(). Referenced by clear(). { unsigned long i; for (i = 0; i < hashsz; i++) NVlist::sclear((char *) &(hashtab[i]) - mem_p); }

int NVHash::sis_empty (  void   )  [protected]

Definition at line 35 of file NVHash.cc. References hashsz, and hashtab. Referenced by is_empty(). { unsigned long i; for (i = 0; i < hashsz; i++) if (hashtab[i]) return 0; return 1; }

void NVHash::sprint (  std::ostream &  os  )  [protected]

Definition at line 49 of file NVHash.cc. References hashsz, hashtab, and NVlist::sprint(). Referenced by print(). { unsigned long i; for (i = 0; i < hashsz; i++) NVlist::sprint((char *) &(hashtab[i]) - mem_p, os); }

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Member Data Documentation

unsigned long NVHash::hashsz [protected]

Definition at line 21 of file NVHash.h. Referenced by NVActiveDB_Iter::_skip_nulls(), NVHashIter::first(), gethashsz(), make_current(), NVHashIter::next(), NVActiveDB_Iter::next(), NVActiveDB_Iter::NVActiveDB_Iter(), open(), sclear(), sis_empty(), and sprint().

nvoff_t* NVHash::hashtab [protected]

Definition at line 20 of file NVHash.h. Referenced by NVActiveDB_Iter::_skip_nulls(), NVHashIter::first(), make_current(), NVHashIter::next(), open(), sadd(), sclear(), sis_empty(), and sprint().

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The documentation for this class was generated from the following files:

• NVHash.h
• NVHash.cc

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