ClassIndexStrategy.java example

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db4o-android-master
/* 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.classindex;

import com.db4o.foundation.*;
import com.db4o.internal.*;

/**
 * @exclude
 */
public interface ClassIndexStrategy {
	
	void initialize(ObjectContainerBase stream);
	
	void read(ObjectContainerBase stream, int indexID);
	
	int write(Transaction transaction);
	
	void add(Transaction transaction, int id);
	
	void remove(Transaction transaction, int id);
	
	int entryCount(Transaction transaction);
	
	int ownLength();
	
	void purge();
	
	/**
	 * Traverses all index entries (java.lang.Integer references).
	 */
	void traverseIds(Transaction transaction,Visitor4 command);
	
	void dontDelete(Transaction transaction, int id);
	
	Iterator4 allSlotIDs(Transaction trans);
	// FIXME: Why is this never called?
	void defragReference(ClassMetadata classMetadata,DefragmentContextImpl context,int classIndexID);
	
	int id();
	// FIXME: Why is this never called?
	void defragIndex(DefragmentContextImpl context);
	
	IntVisitable idVisitable(Transaction trans);
}