arrayencoder.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/ArrayEncoder.java,v $
 * $Revision: 1.13 $
 * $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;

import java.lang.reflect.Array;

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

	java.util.HashMap mmap_;
	
	public ArrayEncoder() {
		some_ = null; // not used
		all_ = null;
	}

	public boolean canHandle( Class c ) {
		return c.isArray() && !c.getComponentType().isPrimitive();
	}
	
	public boolean canHandleSome( Class c ) {
		return c.isArray();
	}

	public EncObject encode( Object obj, Object hint, boolean s ) {
		// hint: An encoder that can handle the elements of the array
		
		Object[] array = (Object[])obj;
		CacheKey key = new CacheKey( obj, hint );
		EncObject eo = (EncObject)cache_.get( key );
		
		if ( eo == null ) {
			
			EncObject[] elements = new EncObject[array.length];
			
			if ( hint instanceof ObjectEncoder ) {
				ObjectEncoder enc = (ObjectEncoder)hint;
				for ( int i = 0; i < array.length; i++ )
					elements[i] = enc.encode( array[i] );
			} else // feed the hint through
				for ( int i = 0; i < array.length; i++ )
					elements[i] = Registry.instance.getEncoder( array[i] )
						.encode( array[i], hint );
			// Have a meta-encoder produce the final result
			eo = Registry.instance.getEncoder( elements ).encode( elements, (hint instanceof String) ? hint : null );

			eo = (EncObject)cache_.try_put( key, eo );
		}
		
		return s ? sign( eo ) : eo;
	}

}