/*
This file is part of Cyclos (www.cyclos.org).
A project of the Social Trade Organisation (www.socialtrade.org).
Cyclos is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Cyclos 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Cyclos; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package nl.strohalm.cyclos.utils.conversion;
import org.apache.commons.lang.StringUtils;
/**
* Converter for entity ids, converting non-positive numbers to null
* @author luis
*/
public class IdConverter implements Converter<Long> {
private static final long serialVersionUID = -3236552411048400756L;
private static final IdConverter INSTANCE = new IdConverter();
public static IdConverter instance() {
return INSTANCE;
}
public String toString(final Long object) {
return object == null ? null : object.toString();
}
public Long valueOf(final String string) {
Long id;
try {
id = Long.valueOf(StringUtils.trimToNull(string));
} catch (final Exception e) {
id = null;
}
return id == null || id.intValue() <= 0 ? null : id;
}
}