java-design-patterns/mediator/src/main/java/com/iluwatar/PartyImpl.java

package com.iluwatar;

import java.util.ArrayList;
import java.util.List;

/**
 * 
 * Party implementation.
 *
 */
public class PartyImpl implements Party {

	private final List<PartyMember> members;

	public PartyImpl() {
		members = new ArrayList<>();
	}

	@Override
	public void act(PartyMember actor, Action action) {
		for (PartyMember member : members) {
			if (member != actor) {
				member.partyAction(action);
			}
		}
	}

	@Override
	public void addMember(PartyMember member) {
		members.add(member);
		member.joinedParty(this);
	}
}