/* KeywordRenamer Copyright (C) 1999-2002 Jochen Hoenicke.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: KeywordRenamer.java.in,v 1.2.2.1 2002/05/28 17:34:17 hoenicke Exp $
 */

package alterrs.jode.obfuscator.modules;

import java.util.Collection;
import java.util.Iterator;

import alterrs.jode.obfuscator.Identifier;
import alterrs.jode.obfuscator.OptionHandler;
import alterrs.jode.obfuscator.Renamer;

public class KeywordRenamer implements Renamer, OptionHandler {
	String keywords[];
	Renamer backup;

	public KeywordRenamer() {
		keywords = new String[] { "if", "else", "for", "while", "throw",
				"return", "class", "interface", "implements", "extends",
				"instanceof", "new", "int", "boolean", "long", "float",
				"double", "short", "public", "protected", "private", "static",
				"synchronized", "strict", "transient", "abstract", "volatile",
				"final",
				/* Not really keywords, but very confusing anyway. */
				"Object", "String", "Thread", "Runnable", "StringBuffer",
				"Vector" };
		backup = new StrongRenamer();
	}

	public void setOption(String option, Collection values) {
		if (option.startsWith("keywords")) {
			keywords = (String[]) values.toArray(new String[values.size()]);
		} else if (option.startsWith("backup")) {
			if (values.size() != 1)
				throw new IllegalArgumentException("Only one backup is allowed");
			backup = (Renamer) values.iterator().next();
		} else
			throw new IllegalArgumentException("Invalid option `" + option
					+ "'");
	}

	public Iterator generateNames(final Identifier ident) {
		return new Iterator() {
			int pos = 0;
			Iterator backing = null;

			public boolean hasNext() {
				return true;
			}

			public Object next() {
				if (pos < keywords.length)
					return keywords[pos++];

				if (backing == null)
					backing = backup.generateNames(ident);

				return backing.next();
			}

			public void remove() {
				throw new UnsupportedOperationException();
			}
		};
	}
}
