floatreader.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/imp/FloatReader.java,v $
 * $Revision: 1.6 $
 * $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.imp;

import jacomma.icm.io.EncObject;
import jacomma.icm.io.EncObjectType;
import jacomma.icm.io.EncObjectReader;

import jacomma.util.ByteArrayReader;

public class FloatReader extends ReaderTemplate {

	EncObject exp_;
	int sig_;
	byte[] mantissa_;
	
	public FloatReader(){}

	public void readNext() throws java.io.IOException {
		if ( !done_ ) {
			// signature
			sig_ = readNextByte();
			
			// exponent
			EncObjectReader erd = Registry.instance.getReader( EncObjectType.Int );
			for( erd.start( stream_ ); erd.hasNext(); erd.readNext() );
			exp_ = erd.getObject();
			
			// mantissa
			ByteArrayReader brd = null;
			for( new ByteArrayReader( sig_ & 0x0f, stream_ );
				 brd.hasNext();
				 brd.readNext() );
			mantissa_ = brd.toByteArray();
			
			done_ = true;
		}
	}
	
	protected EncObject makeObject() {
		return new EncObjectImp( EncObjectType.typeOf( sig_ ), 
								 new Object[]{exp_, mantissa_} );
	}


	public boolean canHandle( EncObjectType t ) {
		return EncObjectType.PosFloat.equals( t )
			|| EncObjectType.NegFloat.equals( t );
	}

}