code: public static ConstantValueExpression makeExpression(VoltType dataType, String value) {
          ConstantValueExpression constantExpr = new ConstantValueExpression();
          constantExpr.setValueType(dataType);
          constantExpr.setValue(value);
          return constantExpr;
      }
docs: Create a new CVE for a given type and value
  @param dataType
  @param value
  @return