/**
  * Get all keys.
  *
  * @return the keys
  */
 public KeyElement[] getKeys() {
   DBElement[] dbe = keys.getElements();
   return (KeyElement[]) Arrays.asList(dbe).toArray(new KeyElement[dbe.length]);
 }
 public ColumnPairElement[] getColumnPairs() {
   DBElement[] dbe = columnPairs.getElements();
   return (ColumnPairElement[]) Arrays.asList(dbe).toArray(new ColumnPairElement[dbe.length]);
 }
 /**
  * Get all indexes.
  *
  * @return the indexes
  */
 public IndexElement[] getIndexes() {
   DBElement[] dbe = indexes.getElements();
   return (IndexElement[]) Arrays.asList(dbe).toArray(new IndexElement[dbe.length]);
 }