/*****************************************************/
/*          This java file is a part of the          */
/*                                                   */
/*           -  Plouf's Java IRC Client  -           */
/*                                                   */
/*   Copyright (C)  2002 - 2004 Philippe Detournay   */
/*                                                   */
/*         All contacts : theplouf@yahoo.com         */
/*                                                   */
/*  PJIRC 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; version 2 or later of  */
/*  the License.                                     */
/*                                                   */
/*  PJIRC 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 PJIRC; if      */
/*  not, write to the Free Software Foundation,      */
/*  Inc., 59 Temple Place, Suite 330, Boston,        */
/*  MA  02111-1307  USA                              */
/*                                                   */
/*****************************************************/

package irc;

import java.util.Vector;

/**
 * RuleItem.
 */
class RuleItem {
	/**
	 * Handlers.
	 */
	public ListHandler[] handlers;
	/**
	 * Value.
	 */
	public Object value;
}

/**
 * Implements a set of rules.
 */
public class RuleList {
	private Vector _list;
	private Object _def;

	/**
	 * Create a new, empty, set of rules.
	 */
	public RuleList() {
		_list = new Vector();
		_def = null;
	}

	/**
	 * Set the default value. By default, this value is null.
	 * 
	 * @param v
	 *          new default value.
	 */
	public void setDefaultValue(Object v) {
		_def = v;
	}

	/**
	 * Get the default value.
	 * 
	 * @return the default value.
	 */
	public Object getDefaultValue() {
		return _def;
	}

	/**
	 * Add a new rule. The rule uses the given array of list patterns (see
	 * ListHandler) and has the given value.
	 * 
	 * @param pattern
	 *          array of pattern.
	 * @param value
	 *          rule value.
	 */
	public void addRule(String[] pattern, Object value) {
		ListHandler[] handlers = new ListHandler[pattern.length];
		for (int i = 0; i < pattern.length; i++)
			handlers[i] = new ListHandler(pattern[i]);
		RuleItem item = new RuleItem();
		item.handlers = handlers;
		item.value = value;
		_list.insertElementAt(item, _list.size());
	}

	private boolean match(RuleItem item, String[] pattern) {
		ListHandler[] handlers = item.handlers;
		if (pattern.length != handlers.length)
			return false;
		for (int i = 0; i < handlers.length; i++)
			if (!handlers[i].inList(pattern[i]))
				return false;
		return true;
	}

	/**
	 * Find the first matching rule for the given values.
	 * 
	 * @param values
	 *          array of values to be tested againts patterns.
	 * @return value of the first matching rule, or default value if no matcing
	 *         rule is found.
	 */
	public Object findValue(String[] values) {
		int l = _list.size();
		for (int i = 0; i < l; i++) {
			RuleItem item = (RuleItem) _list.elementAt(i);
			if (match(item, values))
				return item.value;
		}
		return _def;
	}
}