package jp.ac.u_ryukyu.ie.cr.shoshi.jungle.persistent;

import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Iterator;
import java.util.LinkedList;

import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.operations.TreeOperation;

// not thread safe
public class DefaultChangeListReader implements ChangeListReader
{
	private long pos;
	private ByteBuffer buf;
	private FileChannel ch;
	
	DefaultChangeListReader(FileChannel ch,ByteBuffer buf,long pos)
	{
		this.pos = pos;
		this.buf = buf;
		this.ch = ch;
	}

	@Override
	public ChangeListReader newReader()
	{
		return new DefaultChangeListReader(ch,buf.asReadOnlyBuffer(),pos);
	}

	@Override
	public ChangeList read()
	{
		LinkedList<TreeOperation> list = new LinkedList<TreeOperation>();
		
		int size = buf.getInt();
		if(size == 0){
			
		}
		
		return null;
	}

	@Override
	public Iterator<ChangeList> iterator() {
		return null;
	}
	
	
}