/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o 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 General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see http://www.gnu.org/licenses/. */
package com.db4o.internal.query.processor;
import com.db4o.foundation.*;
/**
* @exclude
*/
public class QPending extends Tree{
final QConJoin _join;
QCon _constraint;
int _result;
// Constants, so QConJoin.evaluatePending is made easy:
static final int FALSE = -4;
static final int BOTH = 1;
static final int TRUE = 2;
QPending(QConJoin a_join, QCon a_constraint, boolean a_firstResult){
_join = a_join;
_constraint = a_constraint;
_result = a_firstResult ? TRUE : FALSE;
}
public int compare(Tree a_to) {
return _constraint.id() - ((QPending)a_to)._constraint.id();
}
void changeConstraint(){
_constraint = _join.getOtherConstraint(_constraint);
}
public Object shallowClone() {
QPending pending = internalClonePayload();
super.shallowCloneInternal(pending);
return pending;
}
QPending internalClonePayload() {
QPending pending = new QPending(_join, _constraint, false);
pending._result=_result;
return pending;
}
public Object key(){
throw new NotImplementedException();
}
}