package net.sourceforge.fenixedu.domain.accessControl;

import java.util.Set;

import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.RootDomainObject;
import net.sourceforge.fenixedu.domain.UnitSite;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.Argument;

/**
 * Specialization of the WebSiteManagersGroup that represents the managers of a
 * particular site: the institution site.
 * 
 * @author cfgi
 */
public class InstitutionSiteManagers extends LeafGroup {

    /**
     * Serial version id.
     */
    private static final long serialVersionUID = 1L;
    private transient UnitSite institutionSite;

    public InstitutionSiteManagers() {
	super();
    }

    @Override
    protected Argument[] getExpressionArguments() {
	return new Argument[0];
    }

    @Override
    public Set<Person> getElements() {
	return initialize().getManagersSet();
    }

    /**
     * Lazy initialization to avoid the necessity of loading many objects when
     * the group is being created.
     */
    private UnitSite initialize() {
	if (this.institutionSite == null) {
	    this.institutionSite = RootDomainObject.getInstance().getInstitutionUnit().getSite();
	}

	return this.institutionSite;
    }

}