private List columnMatches(Column[] myPkColumns, int offset, ForeignKey key) {
if (key.getColumnSpan() > (myPkColumns.length - offset)) {
return null; // not enough columns in the key
}
List columns = new ArrayList();
for (int j = 0; j < key.getColumnSpan(); j++) {
Column column = myPkColumns[j + offset];
if (!column.equals(key.getColumn(j))) {
return null;
} else {
columns.add(column);
}
}
return columns.isEmpty() ? null : columns;
}
