/* Copyright (C) 2004 - 2008  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

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, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
package com.db4o.internal.btree;


/**
 * Composite key for field indexes, first compares on the actual
 * indexed field _value and then on the _parentID (which is a
 * reference to the containing object). 
 * 
 * @exclude
 */
public class FieldIndexKey {
	
	private final Object _value;
    
    private final int _parentID;
    
    public FieldIndexKey(int parentID, Object value){
        _parentID = parentID;
        _value = value;
    }
    
    public int parentID(){
        return _parentID;
    }
    
    public Object value(){
        return _value;
    }
    
    public String toString() {
    	return "FieldIndexKey(" + _parentID + ", " + safeString(_value) + ")";
    }

	private String safeString(Object value) {
		if (null == value) {
			return "null";
		}
		return value.toString();
	}
}
