hash_method.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: hash_method.c,v 12.1 2005/06/16 20:22:53 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/hash.h"

static int __ham_set_h_ffactor __P((DB *, u_int32_t));
static int __ham_set_h_hash
               __P((DB *, u_int32_t(*)(DB *, const void *, u_int32_t)));
static int __ham_set_h_nelem __P((DB *, u_int32_t));

/*
 * __ham_db_create --
 *      Hash specific initialization of the DB structure.
 *
 * PUBLIC: int __ham_db_create __P((DB *));
 */
int
__ham_db_create(dbp)
        DB *dbp;
{
        HASH *hashp;
        int ret;

        if ((ret = __os_malloc(dbp->dbenv,
            sizeof(HASH), &dbp->h_internal)) != 0)
                return (ret);

        hashp = dbp->h_internal;

        hashp->h_nelem = 0;                     /* Defaults. */
        hashp->h_ffactor = 0;
        hashp->h_hash = NULL;

        dbp->get_h_ffactor = __ham_get_h_ffactor;
        dbp->set_h_ffactor = __ham_set_h_ffactor;
        dbp->set_h_hash = __ham_set_h_hash;
        dbp->get_h_nelem = __ham_get_h_nelem;
        dbp->set_h_nelem = __ham_set_h_nelem;

        return (0);
}

/*
 * PUBLIC: int __ham_db_close __P((DB *));
 */
int
__ham_db_close(dbp)
        DB *dbp;
{
        if (dbp->h_internal == NULL)
                return (0);
        __os_free(dbp->dbenv, dbp->h_internal);
        dbp->h_internal = NULL;
        return (0);
}

/*
 * __ham_get_h_ffactor --
 *
 * PUBLIC: int __ham_get_h_ffactor __P((DB *, u_int32_t *));
 */
int
__ham_get_h_ffactor(dbp, h_ffactorp)
        DB *dbp;
        u_int32_t *h_ffactorp;
{
        HASH *hashp;

        hashp = dbp->h_internal;
        *h_ffactorp = hashp->h_ffactor;
        return (0);
}

/*
 * __ham_set_h_ffactor --
 *      Set the fill factor.
 */
static int
__ham_set_h_ffactor(dbp, h_ffactor)
        DB *dbp;
        u_int32_t h_ffactor;
{
        HASH *hashp;

        DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_h_ffactor");
        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        hashp->h_ffactor = h_ffactor;
        return (0);
}

/*
 * __ham_set_h_hash --
 *      Set the hash function.
 */
static int
__ham_set_h_hash(dbp, func)
        DB *dbp;
        u_int32_t (*func) __P((DB *, const void *, u_int32_t));
{
        HASH *hashp;

        DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_h_hash");
        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        hashp->h_hash = func;
        return (0);
}

/*
 * __db_get_h_nelem --
 *
 * PUBLIC: int __ham_get_h_nelem __P((DB *, u_int32_t *));
 */
int
__ham_get_h_nelem(dbp, h_nelemp)
        DB *dbp;
        u_int32_t *h_nelemp;
{
        HASH *hashp;

        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        *h_nelemp = hashp->h_nelem;
        return (0);
}

/*
 * __ham_set_h_nelem --
 *      Set the table size.
 */
static int
__ham_set_h_nelem(dbp, h_nelem)
        DB *dbp;
        u_int32_t h_nelem;
{
        HASH *hashp;

        DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_h_nelem");
        DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);

        hashp = dbp->h_internal;
        hashp->h_nelem = h_nelem;
        return (0);
}

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