public Constraint resolve(Form form)
throws SAXException, IllegalArgumentException, NullPointerException, ParseException {
// Form checks:
if (form == null)
throw new NullPointerException("Non-null form is needed to resolve Constraint");
if (!form.isProducesRecords()) {
addWarning(
"Cannot impose constraint on records of form \""
+ form.id
+ "\" because it does not produce data records.");
return null;
}
// Get column:
@SuppressWarnings("unchecked")
ColumnPointer<ComparableColumn<?>> columnPointer =
(ColumnPointer<ComparableColumn<?>>)
ColumnPointer.ByName(
form.getSchema(),
columnName,
true,
true); // will throw IllegalArgumentException if no such column is found (but name
// sanitation will be used first)
// Column check:
if (!(columnPointer.getColumn() instanceof ComparableColumn<?>))
throw new SAXException(
"Constraint refers to a column (\"" + columnName + "\") which is not comparable.");
// Return RuleConstraint:
return RuleConstraint.FromString(columnPointer, comparison, valueString);
}
/**
* @param columnName
* @param comparison
* @param valueString
* @throws ParseException
*/
public ConstraintDescription(String columnName, String comparisonAttrib, String valueString)
throws ParseException {
this.columnName = columnName;
this.valueString = valueString;
this.comparison = RuleConstraint.parseComparisonString(comparisonAttrib);
}