@Override
protected void init() {
super.init();
if (_cv) return;
// At most one of the following may be specified.
int specified = 0;
if (!isEmpty(cols)) {
specified++;
}
if (!isEmpty(ignored_cols)) {
specified++;
}
if (!isEmpty(ignored_cols_by_name)) {
specified++;
}
if (specified > 1)
throw new IllegalArgumentException(
"Arguments 'cols', 'ignored_cols_by_name', and 'ignored_cols' are exclusive");
// Unify all ignored cols specifiers to ignored_cols.
{
if (!isEmpty(ignored_cols_by_name)) {
assert (isEmpty(ignored_cols));
ignored_cols = ignored_cols_by_name;
ignored_cols_by_name = EMPTY;
}
if (ignored_cols == null) {
ignored_cols = new int[0];
}
}
// At this point, ignored_cols_by_name is dead.
assert (isEmpty(ignored_cols_by_name));
// Create map of ignored columns for speed.
HashMap<Integer, Integer> ignoredColsMap = new HashMap<Integer, Integer>();
for (int i = 0; i < ignored_cols.length; i++) {
int value = ignored_cols[i];
ignoredColsMap.put(new Integer(value), new Integer(1));
}
// Add UUID cols to ignoredColsMap. Duplicates get folded into one entry.
Vec[] vecs = source.vecs();
for (int i = 0; i < vecs.length; i++) {
if (vecs[i].isUUID()) {
ignoredColsMap.put(new Integer(i), new Integer(1));
}
}
// Rebuild ignored_cols from the map. Sort it.
{
ignored_cols = new int[ignoredColsMap.size()];
int j = 0;
for (Integer key : ignoredColsMap.keySet()) {
ignored_cols[j] = key.intValue();
j++;
}
Arrays.sort(ignored_cols);
}
// If the columns are not specified, then select everything.
if (isEmpty(cols)) {
cols = new int[source.vecs().length];
for (int i = 0; i < cols.length; i++) cols[i] = i;
} else {
if (!checkIdx(source, cols))
throw new IllegalArgumentException("Argument 'cols' specified invalid column!");
}
// Make a set difference between cols and ignored_cols.
if (!isEmpty(ignored_cols)) {
int[] icols = !isEmpty(ignored_cols) ? ignored_cols : ignored_cols_by_name;
if (!checkIdx(source, icols))
throw new IllegalArgumentException(
"Argument 'ignored_cols' or 'ignored_cols_by_name' specified invalid column!");
cols = difference(cols, icols);
// Setup all variables in consistent way
ignored_cols = icols;
ignored_cols_by_name = icols;
}
if (cols.length == 0) {
throw new IllegalArgumentException("No column selected");
}
}
