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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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 */

package org.glassfish.admin.amx.util.stringifier;

import java.util.Iterator;


/**
	Stringifies an Iterator, using an optional element Stringifier.
	
	Must be subclassed to provide Stringification of an element.
 */
 
public abstract class IteratorStringifierBase implements Stringifier
{
	public final String			mDelim;
	public final Stringifier	mElementStringifier;
	
		public 
	IteratorStringifierBase()
	{
		this( ObjectStringifier.DEFAULT );
	}
	
		public 
	IteratorStringifierBase( String delim )
	{
		this( delim, new SmartStringifier( delim ) );
	}
	
		public 
	IteratorStringifierBase( Stringifier elementStringifier )
	{
		this( ",", elementStringifier );
	}
	
		public 
	IteratorStringifierBase( String delim, Stringifier elementStringifier )
	{
		mDelim				= delim;
		mElementStringifier	= elementStringifier;
	}
	
		public String
	stringify( Object o )
	{
		assert( o != null );
		Iterator	iter	= (Iterator)o;
		
		return( this.stringify( iter, mDelim, mElementStringifier ) );
	}
	
	
	/*
		Subclass may choose to override this.
	 */
		protected abstract void
	stringifyElement(
		Object			elem,
		String			delim,
		StringBuffer	buf);
		
		
	
		public String
	stringify( Iterator iter, String delim, Stringifier stringifier )
	{
		assert( iter != null );
		
		StringBuffer	buf	= new StringBuffer();
	
		while ( iter.hasNext() )
		{
			final Object	elem	= iter.next();
			
			stringifyElement( elem, delim, buf );
			buf.append( delim );
		}
		
		// strip trailing delimiter
		final int	length	= buf.length();
		if ( length != 0 )
		{
			buf.setLength( length - delim.length() );
		}

		return( buf.toString() );
	}
	
	public final static IteratorStringifier DEFAULT = new IteratorStringifier( "," );
}