/**
* Creates a new instance of this comparator key.
*
* <p>
*
* @param cms the current OpenCms user context
* @param resource the resource to create the key for
* @param dateIdentifiers the date identifiers to use for selecting the date
* @return a new instance of this comparator key
*/
private static CmsDateResourceComparator create(
CmsObject cms, CmsResource resource, List<String> dateIdentifiers) {
CmsDateResourceComparator result = new CmsDateResourceComparator();
result.m_date = calculateDate(cms, resource, dateIdentifiers, resource.getDateCreated());
return result;
}
/** @see java.util.Comparator#compare(java.lang.Object, java.lang.Object) */
public int compare(CmsResource res0, CmsResource res1) {
if (res0 == res1) {
return 0;
}
CmsDateResourceComparator key0 = m_keys.get(res0.getStructureId());
CmsDateResourceComparator key1 = m_keys.get(res1.getStructureId());
if (key0 == null) {
// initialize key if null
key0 = CmsDateResourceComparator.create(m_cms, res0, m_dateIdentifiers);
m_keys.put(res0.getStructureId(), key0);
}
if (key1 == null) {
// initialize key if null
key1 = CmsDateResourceComparator.create(m_cms, res1, m_dateIdentifiers);
m_keys.put(res1.getStructureId(), key1);
}
if (m_asc) {
// sort in ascending order
if (key0.m_date > key1.m_date) {
return 1;
}
if (key0.m_date < key1.m_date) {
return -1;
}
} else {
// sort in descending order
if (key0.m_date > key1.m_date) {
return -1;
}
if (key0.m_date < key1.m_date) {
return 1;
}
}
return 0;
}