/* 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.
 *
 * $Id$
 */

package net.sf.jode.obfuscator.modules;
import net.sf.jode.obfuscator.*;
///#def COLLECTIONS java.util
import java.util.Collection;
import java.util.Iterator;
///#enddef
///#def COLLECTIONEXTRA java.lang
import java.lang.UnsupportedOperationException;
///#enddef

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();
	    }
	};
    }
}