public void cartesianProductOrUnionIfSameHeaders(Table t) {
int t1Cols = this.getColumnsCount();
int t2Cols = t.getColumnsCount();
if (t2Cols == 0) return;
else if (t1Cols == 0) {
if (this.headers == null) this.headers = new ArrayList<Attribute>();
for (Attribute att : t.getHeaders()) this.headers.add(new Attribute(att));
if (this.values == null) this.values = new ArrayList<List<String>>();
if (t.getValues() != null)
for (List<String> v : t.getValues()) if (v != null) values.add(new ArrayList<String>(v));
} else {
if (sameHeaders(t)) {
List<Table> tables = new ArrayList<Table>();
tables.add(this);
tables.add(t);
Table result = union(tables);
this.setHeaders(result.getHeaders());
this.setValues(result.getValues());
return;
}
for (Attribute att : t.getHeaders()) headers.add(new Attribute(att));
int t1Rows = this.getRowsCount();
int t2Rows = t.getRowsCount();
int totalRows = t1Rows == 0 || t2Rows == 0 ? t1Rows + t2Rows : t1Rows * t2Rows;
List<List<String>> values = new ArrayList<List<String>>();
for (int i = 0; i < totalRows; i++) {
List<String> row = new ArrayList<String>();
for (int j = 0; j < t1Cols; j++) {
int index = t1Rows == 0 ? -1 : i % t1Rows;
if (index == -1 || this.values == null || this.values.get(index) == null) row.add(null);
else row.add(this.values.get(index).get(j));
}
for (int j = 0; j < t2Cols; j++) {
int index = t2Rows == 0 ? -1 : i % t2Rows;
if (index == -1 || t.getValues() == null || t.getValues().get(index) == null)
row.add(null);
else row.add(t.getValues().get(index).get(j));
}
values.add(row);
}
this.values = values;
}
}
