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// **********************************************************************
//
// Copyright (c) 2001
// Mutable Realms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
package Freeze;
class DBCursorI extends Ice.LocalObjectImpl implements DBCursor
{
public Ice.Communicator
getCommunicator()
{
// immutable
return _communicator;
}
synchronized public void
curr(KeyHolder k, ValueHolder v)
{
if(_cursor == null)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "\"" + _name + "\" has been closed";
throw ex;
}
com.sleepycat.db.Dbt dbKey = new com.sleepycat.db.Dbt();
com.sleepycat.db.Dbt dbData = new com.sleepycat.db.Dbt();
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "reading current value from database \"" + _name + "\"");
}
try
{
int rc = _cursor.get(dbKey, dbData, com.sleepycat.db.Db.DB_CURRENT);
if(rc == com.sleepycat.db.Db.DB_NOTFOUND)
{
DBNotFoundException ex = new DBNotFoundException();
ex.message = _errorPrefix + "Dbc.get: DB_NOTFOUND";
throw ex;
}
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.get: " + e.getMessage();
throw ex;
}
//
// Copy the data from the read key & data
//
k.value = dbKey.get_data();
v.value = dbData.get_data();
}
synchronized public void
set(byte[] v)
{
if(_cursor == null)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "\"" + _name + "\" has been closed";
throw ex;
}
com.sleepycat.db.Dbt dbKey = null;
com.sleepycat.db.Dbt dbData = new com.sleepycat.db.Dbt(v);
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "setting current value in database \"" + _name + "\"");
}
try
{
int rc = _cursor.put(dbKey, dbData, com.sleepycat.db.Db.DB_CURRENT);
/* Since the underlying data is btree this cannot occur.
*
if(rc == com.sleepycat.db.Db.DB_NOTFOUND)
{
DBNotFoundException ex = new DBNotFoundException();
ex.message = _errorPrefix + "Dbc.put: DB_NOTFOUND";
throw ex;
}
*/
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.put: " + e.getMessage();
throw ex;
}
}
synchronized public boolean
next()
{
if(_cursor == null)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "\"" + _name + "\" has been closed";
throw ex;
}
com.sleepycat.db.Dbt dbKey = new com.sleepycat.db.Dbt();
dbKey.set_flags(com.sleepycat.db.Db.DB_DBT_PARTIAL);
com.sleepycat.db.Dbt dbData = new com.sleepycat.db.Dbt();
dbData.set_flags(com.sleepycat.db.Db.DB_DBT_PARTIAL);
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "moving to next value in database \"" + _name + "\"");
}
try
{
int rc = _cursor.get(dbKey, dbData, com.sleepycat.db.Db.DB_NEXT);
if(rc == com.sleepycat.db.Db.DB_NOTFOUND)
{
return false;
}
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.get: " + e.getMessage();
throw ex;
}
return true;
}
synchronized public boolean
prev()
{
if(_cursor == null)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "\"" + _name + "\" has been closed";
throw ex;
}
com.sleepycat.db.Dbt dbKey = new com.sleepycat.db.Dbt();
dbKey.set_flags(com.sleepycat.db.Db.DB_DBT_PARTIAL);
com.sleepycat.db.Dbt dbData = new com.sleepycat.db.Dbt();
dbData.set_flags(com.sleepycat.db.Db.DB_DBT_PARTIAL);
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "moving to previous value in database \"" + _name + "\"");
}
try
{
int rc = _cursor.get(dbKey, dbData, com.sleepycat.db.Db.DB_PREV);
if(rc == com.sleepycat.db.Db.DB_NOTFOUND)
{
return false;
}
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.get: " + e.getMessage();
throw ex;
}
return true;
}
synchronized public void
del()
{
if(_cursor == null)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "\"" + _name + "\" has been closed";
throw ex;
}
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "removing the current element in database \"" + _name + "\"");
}
try
{
int rc = _cursor.del(0);
if(rc == com.sleepycat.db.Db.DB_KEYEMPTY)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "Dbc.del: DB_KEYEMPTY";
throw ex;
}
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.get: " + e.getMessage();
throw ex;
}
}
synchronized public DBCursor
_clone()
{
if(_cursor == null)
{
DBException ex = new DBException();
ex.message = _errorPrefix + "\"" + _name + "\" has been closed";
throw ex;
}
com.sleepycat.db.Dbc cursor;
try
{
cursor = _cursor.dup(com.sleepycat.db.Db.DB_POSITION);
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.close: " + e.getMessage();
throw ex;
}
return new DBCursorI(_communicator, _name, cursor);
}
synchronized public void
close()
{
if(_cursor == null)
{
return;
}
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "closing cursor \"" + _name + "\"");
}
try
{
_cursor.close();
}
catch(com.sleepycat.db.DbDeadlockException e)
{
DBDeadlockException ex = new DBDeadlockException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.close: " + e.getMessage();
throw ex;
}
catch(com.sleepycat.db.DbException e)
{
DBException ex = new DBException();
ex.initCause(e);
ex.message = _errorPrefix + "Dbc.close: " + e.getMessage();
throw ex;
}
_cursor = null;
}
DBCursorI(Ice.Communicator communicator, String name, com.sleepycat.db.Dbc cursor)
{
_communicator = communicator;
_name = name;
_cursor = cursor;
_errorPrefix = "Freeze::DBCursor(\"" + _name + "\"): ";
_trace = _communicator.getProperties().getPropertyAsInt("Freeze.Trace.DB");
if(_trace >= 1)
{
_communicator.getLogger().trace("DB", "creating cursor for \"" + _name + "\"");
}
}
private Ice.Communicator _communicator;
private int _trace = 0;
private String _name;
private String _errorPrefix;
private com.sleepycat.db.Dbc _cursor;
}
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