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package org.apache.catalina;


import java.security.Principal;
import java.util.Iterator;


/**
 * <p>Abstract representation of a group of {@link User}s in a
 * {@link UserDatabase}.  Each user that is a member of this group
 * inherits the {@link Role}s assigned to the group.</p>
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.3 $ $Date: 2007/05/05 05:31:51 $
 * @since 4.1
 */

public interface Group extends Principal {


    // ------------------------------------------------------------- Properties


    /**
     * Return the description of this group.
     */
    public String getDescription();


    /**
     * Set the description of this group.
     *
     * @param description The new description
     */
    public void setDescription(String description);


    /**
     * Return the group name of this group, which must be unique
     * within the scope of a {@link UserDatabase}.
     */
    public String getGroupname();


    /**
     * Set the group name of this group, which must be unique
     * within the scope of a {@link UserDatabase}.
     *
     * @param groupname The new group name
     */
    public void setGroupname(String groupname);


    /**
     * Return the set of {@link Role}s assigned specifically to this group.
     */
    public Iterator getRoles();


    /**
     * Return the {@link UserDatabase} within which this Group is defined.
     */
    public UserDatabase getUserDatabase();


    /**
     * Return the set of {@link User}s that are members of this group.
     */
    public Iterator getUsers();


    // --------------------------------------------------------- Public Methods


    /**
     * Add a new {@link Role} to those assigned specifically to this group.
     *
     * @param role The new role
     */
    public void addRole(Role role);


    /**
     * Is this group specifically assigned the specified {@link Role}?
     *
     * @param role The role to check
     */
    public boolean isInRole(Role role);


    /**
     * Remove a {@link Role} from those assigned to this group.
     *
     * @param role The old role
     */
    public void removeRole(Role role);


    /**
     * Remove all {@link Role}s from those assigned to this group.
     */
    public void removeRoles();


}