01: package edu.iu.uis.eden;
02:
03: import java.io.Serializable;
04:
05: /**
06: * Superinterface of UserId and GroupId
07: * @author Aaron Hamid (arh14 at cornell dot edu)
08: */
09: public interface Id extends Serializable {
10: /**
11: * Returns true if this Id has an empty value. Empty Ids can't be used as keys in a Hash,
12: * among other things.
13: *
14: * @return true if this instance doesn't have a value
15: */
16: public boolean isEmpty();
17: }
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