}
Expression expression = null;
if( JSONSupport.containsKey(jsonComparison, "value") ) {
String valueString = jsonComparison.get("value").toString();
expression = new ExpressionConstantImpl(valueString);
}
if( JSONSupport.containsKey(jsonComparison, "variable") ) {
String valueString = jsonComparison.get("variable").toString();
expression = new ExpressionVariableImpl(valueString);
}