/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.dictionary.constraint;

import org.alfresco.service.cmr.dictionary.ConstraintException;
import org.alfresco.service.cmr.repository.datatype.DefaultTypeConverter;
import org.alfresco.service.cmr.repository.datatype.TypeConversionException;
import org.alfresco.service.cmr.security.AuthorityType;

/**
 * Apply constraints for user names.
 * 
 * @author andyh
 *
 */
public class UserNameConstraint extends AbstractConstraint
{
    private static final String ERR_INVALID_USERNAME = "d_dictionary.constraint.user_name.invalid_user_name";
    private static final String ERR_NON_STRING = "d_dictionary.constraint.user_name.non_string";

    @Override
    protected void evaluateSingleValue(Object value)
    {
        // ensure that the value can be converted to a String
        String checkValue = null;
        try
        {
            checkValue = DefaultTypeConverter.INSTANCE.convert(String.class, value);
        }
        catch (TypeConversionException e)
        {
            throw new ConstraintException(ERR_NON_STRING, value);
        }
        
        AuthorityType type = AuthorityType.getAuthorityType(checkValue);
        if((type != AuthorityType.USER) && (type != AuthorityType.GUEST))
        {
            throw new ConstraintException(ERR_INVALID_USERNAME, value, type);
        }
    }
}