/* 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.db4ounit.common.ta.collections;

import com.db4o.activation.*;
import com.db4o.db4ounit.common.ta.*;

public class Page extends ActivatableImpl {

	public static final int PAGESIZE = 100;
	
	private Object[] _data = new Object[PAGESIZE];
	private int _top = 0;

	private int _pageIndex;

	private transient boolean _dirty = false;

	public Page(int pageIndex) {
		_pageIndex = pageIndex;
	}

	public boolean add(Object obj) {
		// TA BEGIN
		activate(ActivationPurpose.READ);
		// TA END
		_dirty = true;
		_data[_top++] = obj;
		return true;
	}

	public int size() {
		// TA BEGIN
		activate(ActivationPurpose.READ);
		// TA END
		return _top;
	}

	public Object get(int indexInPage) {
		// TA BEGIN
		activate(ActivationPurpose.READ);
		// TA END
//		System.out.println("got from page: " + _pageIndex);
		_dirty = true; // just to be safe, we'll mark things as dirty if they are used.
		return _data[indexInPage];
	}

	public boolean isDirty() {
		// TA BEGIN
//		activate();
		// TA END
		return _dirty;
	}

	public void setDirty(boolean dirty) {
		// TA BEGIN
//		activate();
		// TA END
		_dirty = dirty;
	}

	public int getPageIndex() {
		// TA BEGIN
		activate(ActivationPurpose.READ);
		// TA END
		return _pageIndex;
	}

	public boolean atCapacity() {
		return capacity() == 0;
	}
	
	public int capacity() {
		// TA BEGIN
		activate(ActivationPurpose.READ);
		// TA END
		return Page.PAGESIZE - size();
	}
}
