package envoy.event;

import java.util.*;

import envoy.data.User;

/**
 * This event creates a group with the given name.
 *
 * @author Leon Hofmeister
 * @since Envoy Common v0.1-beta
 */
public final class GroupCreation extends Event<String> {

	private final Set<Long> initialMemberIDs;

	private static final long serialVersionUID = 0L;

	/**
	 * @param name             the name of this group at creation time
	 * @param initialMemberIDs the IDs of all {@link User}s that should be group
	 *                         members from the beginning on (excluding the creator
	 *                         of this group)
	 * @since Envoy Common v0.1-beta
	 */
	public GroupCreation(String name, Set<Long> initialMemberIDs) {
		super(name);
		this.initialMemberIDs = initialMemberIDs != null ? initialMemberIDs : new HashSet<>();
	}

	/**
	 * @return the IDs of all {@link User}s that are members from the beginning
	 *         (excluding the creator of this group)
	 * @since Envoy Common v0.1-beta
	 */
	public Set<Long> getInitialMemberIDs() { return initialMemberIDs; }
}