Basic implementation.
The tested operation is equality, unless it is explicitly set.
author: Rob van Maris version: $Id: BasicFieldCompareConstraint.java,v 1.12 2006/10/16 12:56:57 pierre Exp $ since: MMBase-1.7
Constructor.
Protected, so only subclasses can be instantiated.
Parameters: field - The associated field. throws: IllegalArgumentException - when an invalid argument is supplied.
Sets operator.
Parameters: operator - the operator value This BasicFieldCompareConstraint instance. throws: IllegalArgumentException - when an invalid argument is supplied.