objectreader.java

Java Communicating Agents是一个用于开发网络反应式信息agent的框架

/*
 * $Source: /home/data/cvsroot/src/jacomma/icm/io/ObjectReader.java,v $
 * $Revision: 1.8 $
 * $Date: 2000/10/28 20:09:07 $
 *
 * This file is part of the jacomma framework
 * Copyright (c) 2000 	Dimitrios Vyzovitis
 *			mailto:[e-mail]
 *			
 *
 *			
 *			
 *			
 *
 *	This library is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU Library General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This library 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 Library General Public License for more details.
 *
 *	You should have received a copy of the GNU Library 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
 */

package jacomma.icm.io;

/**
 * TBA
 **/
public class ObjectReader {
	
	protected java.io.InputStream stream_;
	
	private EncObjectReader drd_; // Director (@see Builder-Director pattern)

	public ObjectReader( java.io.InputStream stream ) {
		stream_ = stream;
		drd_ = EncObjectReader.Registry.instance.getReader( EncObjectType.Any );
	}
	
	public Object readObject() throws java.io.IOException {
		return readObject( null );
	}

	public synchronized Object readObject( Object hint ) 
		throws java.io.IOException {
			
		for( drd_.start( stream_ ); drd_.hasNext(); drd_.readNext() );
		EncObject obj = drd_.getObject();
		
		EncObjectDecoder dec = EncObjectDecoder.Registry.instance.getDecoder( obj );
		if ( dec == null )
			throw new NoDecoderException( obj );
		
		return dec.decode( obj, hint );
	}
		
	public void close() throws java.io.IOException {
		stream_.close();
	}
	
	public int available() throws java.io.IOException {
		return stream_.available();
	}

}