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

import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;

public interface IFreePageManager {
	public void open(int fileId);
	
	public void close();
	
	public int getFreePage(ITreeIndexMetaDataFrame metaFrame)
			throws HyracksDataException;

	public void addFreePage(ITreeIndexMetaDataFrame metaFrame, int freePage)
			throws HyracksDataException;

	public int getMaxPage(ITreeIndexMetaDataFrame metaFrame)
			throws HyracksDataException;

	public void init(ITreeIndexMetaDataFrame metaFrame, int currentMaxPage)
			throws HyracksDataException;

	public ITreeIndexMetaDataFrameFactory getMetaDataFrameFactory();

	// required to return negative values
	public byte getMetaPageLevelIndicator();

	public byte getFreePageLevelIndicator();

	// determined by examining level indicator
	public boolean isMetaPage(ITreeIndexMetaDataFrame metaFrame);

	public boolean isFreePage(ITreeIndexMetaDataFrame metaFrame);
	
	public int getFirstMetadataPage();		
}