/**
* Create a custom field ordering from a list of strings representing field labels. There may
* also be one or more optionally-quoted strings, each indicating a value to be inserted into a
* constant-valued column.
*
* @param labels a list of field labels and optionally constant string values
* @throws CustomColumnOrderingException if there is an unrecognised field name or no id fields
*/
public CustomColumnOrdering(List<String> labels) throws CustomColumnOrderingException {
this.ordering = ReportColumn.fromStrings(labels);
// Note we regenerate the labels from the ReportColumns so constant-valued
// columns are consistently unquoted.
this.orderedLabels = ReportColumn.getLabels(ordering);
// Create the Field ordering
this.fieldOrdering =
new ArrayList<Field>() {
{
for (ReportColumn c : ordering) {
if (c.isField()) add(c.field);
}
}
};
// Sanity checks
// Are there any fields included?
if (this.fieldOrdering.isEmpty())
throw new CustomColumnOrderingException("", "No valid fields specified.");
// Are there id fields included?
if (!Field.idFields.clone().removeAll(this.fieldOrdering)) {
String idFieldStr =
String.format("(%s)", StringUtils.join(Field.getLabels(Field.idFields), ", "));
throw new CustomColumnOrderingException(
"",
String.format(
"No identifying fields specified. You must include one of %s.", idFieldStr));
}
// Set the field set if all is okay
this.fields = EnumSet.copyOf(this.fieldOrdering);
}
/**
* Remove the named columns from the ordering. Returns the ordering for convenience.
*
* @param columns a collection of labels
* @return
*/
protected CustomColumnOrdering remove(Collection<String> columns) {
this.ordering.removeAll(ReportColumn.fromStrings(columns));
this.orderedLabels.removeAll(columns);
Collection<Field> flds = Field.getFields(columns);
this.fieldOrdering.removeAll(flds);
this.fields.removeAll(flds);
return this;
}
/**
* Create a custom ordering without generating exceptions on invalid specification. This method
* will create a custom ordering as per the list of labels. Labels that do not match fields will
* be included as constant-valued columns, and there are no restrictions on whether id fields
* are included (allowing for the creation of orderings leading to useless reports); nor are
* there limits on the number of columns which can be included. This method should therefore
* only be used in creating enumerated PredefinedFieldOrderings, or user-defined orderings
* defined through the LOCKSS user interface.
*
* @param labels
* @return
*/
protected static CustomColumnOrdering createUnchecked(List<String> labels) {
final List<ReportColumn> ordering = ReportColumn.fromStrings(labels);
List<Field> fieldOrdering =
new ArrayList<Field>() {
{
for (ReportColumn c : ordering) {
if (c.isField()) add(c.field);
}
}
};
return new CustomColumnOrdering(ordering, fieldOrdering, labels);
}