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/*************************************************************************************************
* Abstraction for database managers compatible with DBM
* Copyright (C) 2000-2006 Mikio Hirabayashi
* This file is part of QDBM, Quick Database Manager.
* QDBM is free software; you can redistribute it and/or modify it under the terms of the GNU
* Lesser General Public License as published by the Free Software Foundation; either version
* 2.1 of the License or any later version. QDBM is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
* You should have received a copy of the GNU Lesser General Public License along with QDBM; if
* not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA.
*************************************************************************************************/
package qdbm;
/**
* Abstraction for database managers compatible with DBM.
*/
public interface ADBM {
//----------------------------------------------------------------
// methods
//----------------------------------------------------------------
/**
* Close the database connection.
* @throws DBMException if an error occurs.
*/
void close() throws DBMException;
/**
* Store a record.
* @param key a byte array of a key.
* @param val a byte array of a value.
* @param replace whether the existing value is to be overwritten or not.
* @throws DBMException if an error occurs or replace is cancelled.
*/
void store(byte[] key, byte[] val, boolean replace) throws DBMException;
/**
* Delete a record.
* @param key a byte array of a key.
* @throws DBMException if an error occurs or no record corresponds.
*/
void delete(byte[] key) throws DBMException;
/**
* Fetch a record.
* @param key a byte array of a key.
* @return a byte array of the value of the corresponding record.
* @throws DBMException if an error occurs or no record corresponds.
*/
byte[] fetch(byte[] key) throws DBMException;
/**
* Get the first key.
* @return a byte array of the key of the first record.
* @throws DBMException if an error occurs or no record corresponds.
*/
byte[] firstkey() throws DBMException;
/**
* Get the next key.
* @return a byte array of the key of the next record.
* @throws DBMException if an error occurs or no record corresponds.
*/
byte[] nextkey() throws DBMException;
/**
* Check whether a fatal error occured or not.
* @return true if the database has a fatal error, false if not.
* @throws DBMException if an error occurs.
*/
boolean error() throws DBMException;
}
/* END OF FILE */
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