dtpinputstream.java

kaffe Java 解释器语言,源码,Java的子集系统,开放源代码

/*
 * $Id: DTPInputStream.java,v 1.1 2004/01/10 23:34:31 dalibor Exp $
 * Copyright (C) 2003 The Free Software Foundation
 * 
 * This file is part of GNU inetlib, a library.
 * 
 * GNU inetlib is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * GNU inetlib 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 library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * As a special exception, if you link this library with other files to
 * produce an executable, this library does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * This exception does not however invalidate any other reasons why the
 * executable file might be covered by the GNU General Public License.
 */

package gnu.inet.ftp;

import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;

/**
 * An input stream that notifies a DTP on completion.
 *
 * @author <a href='mailto:[e-mail]'>Chris Burdess</a>
 * @version $Revision: 1.1 $ $Date: 2004/01/10 23:34:31 $
 */
abstract class DTPInputStream extends FilterInputStream
{

    DTP dtp;
    boolean transferComplete;
    
    /**
     * Constructor.
     * @param dtp the controlling data transfer process
     * @param in the underlying socket stream
     */
    DTPInputStream(DTP dtp, InputStream in)
    {
        super(in);
        this.dtp = dtp;
        transferComplete = false;
    }
    
    /**
     * Marks this input stream complete.
     * This is called by the DTP.
     */
    void setTransferComplete(boolean flag)
    {
        transferComplete = flag;
    }
    
    public abstract int read() throws IOException;
    
    public abstract int read(byte[]buf) throws IOException;
    
    public abstract int read(byte[]buf, int off, int len) throws IOException;
    
    /**
     * Notifies the controlling DTP that this stream has completed transfer.
     */
    public void close() throws IOException
    {
        dtp.transferComplete();
    }
    
}