package net.sourceforge.fenixedu.domain.accessControl;

import java.util.Set;

import net.sourceforge.fenixedu.domain.Attends;
import net.sourceforge.fenixedu.domain.Grouping;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.accessControl.DomainBackedGroup;
import net.sourceforge.fenixedu.domain.accessControl.Group;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.Argument;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.GroupBuilder;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.exceptions.GroupDynamicExpressionException;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.operators.IdOperator;

public class GroupingGroup extends DomainBackedGroup<Grouping> {

    private static final long serialVersionUID = 1L;

    public GroupingGroup(Grouping grouping) {
	super(grouping);
    }

    @Override
    public Set<Person> getElements() {
	Set<Person> persons = super.buildSet();

	for (Attends attend : getObject().getAttends()) {
	    persons.add(attend.getRegistration().getStudent().getPerson());
	}
	return super.freezeSet(persons);
    }

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

    public static class Builder implements GroupBuilder {

	public Group build(Object[] arguments) {
	    try {
		return new GroupingGroup((Grouping) arguments[0]);
	    } catch (ClassCastException e) {
		throw new GroupDynamicExpressionException("accessControl.group.builder.grouping.notGrouping", arguments[0]
			.toString());
	    }
	}

	public int getMinArguments() {
	    return 0;
	}

	public int getMaxArguments() {
	    return 1;
	}

    }
}