package org.ovirt.engine.api.restapi.utils;
import java.util.Date;
import java.util.GregorianCalendar;
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;
import org.ovirt.engine.api.restapi.types.SnapshotMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TypeConversionHelper {
private static volatile DatatypeFactory datatypeFactory;
private static final Logger log = LoggerFactory.getLogger(SnapshotMapper.class);
protected static final String DATATYPE_FACTORY_CREATION_FAILED = "DatatypeFactory creation failed.";
/**
* called with class-level mutex held
*/
private static DatatypeFactory getDatatypeFactory() {
if (datatypeFactory == null) {
try {
datatypeFactory = DatatypeFactory.newInstance();
} catch (DatatypeConfigurationException dce) {
log.warn(DATATYPE_FACTORY_CREATION_FAILED, dce);
}
}
return datatypeFactory;
}
/**
* Class-level synchronization to avoid potential thread-safety issues
* with statically shared DatatypeFactory.
*/
public static synchronized XMLGregorianCalendar toXMLGregorianCalendar(Date date,
XMLGregorianCalendar template) {
GregorianCalendar calendar = template != null ? template.toGregorianCalendar() : new GregorianCalendar();
calendar.setTime(date);
DatatypeFactory factory = getDatatypeFactory();
return factory != null
? factory.newXMLGregorianCalendar(calendar)
: null;
}
}