uniformarrayencoder.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/UniformArrayEncoder.java,v $
 * $Revision: 1.5 $
 * $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.ObjectEncoder;
import jacomma.icm.io.EncObjectSignature;

/**
 * TBA
 **/
public class UniformArrayEncoder extends EncoderTemplate {

	public UniformArrayEncoder() {
		all_ = null;
		some_ = null;
	}
	
	public boolean canHandle( Class c ) { 
		return false;  // specialized encoder
	}

	public boolean canHandleSome( Class c ) {
		return c.isArray();
	}
	
	public boolean canHandle( Object obj ) {
		if ( canHandle( obj.getClass() ) ) {
			// Check uniform
			Object[] array = (Object[])obj;
			boolean can = true;
			if ( array.length > 0 ) {
				Class c = array[0].getClass();
				for ( int i = 1; i < array.length; i++ )
					if ( !c.equals( array[i].getClass() ) ) {
						can = false;
						break;
					}
			}
			
			return can;
		} else 
			return false;
	}

	public EncObject encode( Object obj, Object hint, boolean s ) {
		// hint: An encoder that can handle the elements of the array

		Object[] array = (Object[])obj;
		EncObject[] elements =  null;
		CacheKey key = new CacheKey( obj, hint );
		
		if ( (elements = (EncObject[])cache_.get( obj )) == null ) {
			elements = new EncObject[array.length];
			
			if ( array.length > 0 ) {
				ObjectEncoder enc = (ObjectEncoder)hint;
				if ( enc == null )
					enc = Registry.instance.getEncoder( array[0] );
				for ( int i = 0; i < array.length; i++ )
					elements[i] = enc.encode( array[i] );
			}
			
			elements = (EncObject[])cache_.try_put( key, elements );
		}

		
		// Have a meta-encoder produce the final result
		EncObject eo = Registry.instance.getEncoder( elements ).encode( elements  );
		return s ? sign( eo ) : eo;

	}

}