/**
* Retrieves existing instances that qualify to be a target of this property, and instances that
* already are a target of the property and anchor! Returns an array with first the range class
* name, then those objects already in the range, then a 'null', and then all eligible objects.
*
* @param user user id
* @param name property name
* @param anchor Unique ID of Anchor
* @param type session type
* @param key browsing session id (null if session type is EDIT)
* @return ExistingInstances, holds all necessary information about object that already are or
* could be in the range, empty if session expired, or null if error occurred.
*/
public ExistingInstances getInstances(
String user, String name, String anchor, int type, String key) {
try {
if (!userMap.containsKey(user)) {
ExistingInstances result = new ExistingInstances();
result.setRange(null, null);
return result;
}
LiberSession session = userMap.get(user);
synchronized (session) {
session.setLastUpdated();
ExistingInstances e = session.getRangeInstances(name, anchor, type, key);
return e;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
