/* MultiIdentifierMatcher Copyright (C) 1999 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 jode.obfuscator.modules;
import jode.obfuscator.*;
import @COLLECTIONS@.Collection;

public class MultiIdentifierMatcher implements IdentifierMatcher, OptionHandler {
    /**
     * Useful constant for giving to the constructor.
     */
    public static boolean OR = true;
    /**
     * Useful constant for giving to the constructor.
     */
    public static boolean AND = false;

    IdentifierMatcher[] matchers;
    boolean isOr;

    /**
     * Create an empty MultiIdentifierMatcher.
     */
    public MultiIdentifierMatcher() {
	this.matchers = new IdentifierMatcher[0];
    }

    /**
     * Create an IdentifierMatcher out of other matchers.
     * @param isOr if true, match should return the logical (shortcut)
     * or of the underlying matchers, if false it returns the logical and.
     * @param matchers the underlying matchers
     */
    public MultiIdentifierMatcher(boolean isOr, 
				  IdentifierMatcher[] matchers) {
	this.isOr = isOr;
	this.matchers = matchers;
    }

    public void setOption(String option, Collection values) {
	if (option.equals("or")) {
	    isOr = true;
	    matchers = (IdentifierMatcher[])
		values.toArray(new IdentifierMatcher[values.size()]);
	} else if (option.equals("and")) {
	    isOr = false;
	    matchers = (IdentifierMatcher[])
		values.toArray(new IdentifierMatcher[values.size()]);
	} else
	    throw new IllegalArgumentException("Invalid option `"+option+"'.");
    }
    

    public boolean matches(Identifier ident) {
	for (int i=0; i< matchers.length; i++) {
	    if (matchers[i].matches(ident) == isOr)
		return isOr;
	}
	return !isOr;
    }

    public boolean matchesSub(Identifier ident, String name) {
	for (int i=0; i< matchers.length; i++) {
	    if (matchers[i].matchesSub(ident, name) == isOr)
		return isOr;
	}
	return !isOr;
    }

    public String getNextComponent(Identifier ident) {
	if (isOr == AND) {
	    for (int i=0; i< matchers.length; i++) {
		String next = matchers[i].getNextComponent(ident);
		if (next != null && matchesSub(ident, next))
		    return next;
	    }
	    return null;
	}
	// OR case
	String next = null;
	for (int i = 0; i < matchers.length; i++) {
	    if (!matchesSub(ident, null))
		continue;
	    if (next != null
		&& matchers[i].getNextComponent(ident) != next)
		return null;
	    next = matchers[i].getNextComponent(ident);
	    if (next == null)
		return null;
	}
	return next;
    }
}