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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.dm;

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * ???Ըı????λ?õ??????
 * @author WangXiaoJun
 *
 */
public abstract class RandomOutputStream extends OutputStream {
	/**
	 * ???????λ??
	 * @param newPosition
	 * @throws IOException
	 */
	public abstract void position(long newPosition) throws IOException;
	
	/**
	 * ???ص?ǰ???λ??
	 * @return
	 * @throws IOException
	 */
	public abstract long position() throws IOException;
	
	/**
	 * ????????ɹ?????true
	 * @return
	 * @throws IOException
	 */
	public abstract boolean tryLock() throws IOException;
	
	/**
	 * ?ȴ?????ֱ?????ɹ?
	 * @return boolean
	 * @throws IOException
	 */
	public boolean lock() throws IOException {
		return true;
	}
	
	/**
	 * ȡ??ָ??λ?ÿ?ʼ????????
	 * @param pos λ??
	 * @return InputStream
	 * @throws IOException
	 */
	public InputStream getInputStream(long pos) throws IOException {
		return null;
	}
}