/*****************************************************/
/*          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;

/**
 * The parameter mixer, designed to mix parameters from several other parameter
 * providers.
 */
public class ParameterMixer implements ParameterProvider {
	private ParameterProvider _p1;
	private ParameterProvider _p2;

	/**
	 * Creates a new parameter mixer, combining parameters from the two given
	 * parameter providers. If a parameter is defined in both providers, the first
	 * one will have priority.
	 * 
	 * @param p1
	 *          the first parameter provider.
	 * @param p2
	 *          the second parameter provider.
	 */
	public ParameterMixer(ParameterProvider p1, ParameterProvider p2) {
		_p1 = p1;
		_p2 = p2;
	}

	@Override
	public String getParameter(String name) {
		String ans = _p1.getParameter(name);
		if (ans == null)
			return _p2.getParameter(name);
		return ans;
	}

}