/*
 * Copyright 2009-2010 by The Regents of the University of California
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * you may obtain a copy of the License from
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package edu.uci.ics.hyracks.storage.am.common.api;

import edu.uci.ics.hyracks.storage.common.buffercache.ICachedPage;

public interface ITreeIndexMetaDataFrame {
	public void initBuffer(byte level);

	public void setPage(ICachedPage page);

	public ICachedPage getPage();

	public byte getLevel();

	public void setLevel(byte level);

	public int getNextPage();

	public void setNextPage(int nextPage);

	public int getMaxPage();

	public void setMaxPage(int maxPage);

	public int getFreePage();

	public boolean hasSpace();

	public void addFreePage(int freePage);
	
	// Special flag for LSM-Components to mark whether they are valid or not. 
	public boolean isValid();
	
	// Set special validity flag.
	public void setValid(boolean isValid);
	
	// Special placeholder for LSN information. Used for transactional LSM indexes.
	public long getLSN();
	
	public void setLSN(long lsn);
}