@Override
public TableImpl getTable(String name) throws IllegalArgumentException {
Utility.checkTableNameIsCorrect(name);
if (tables.containsKey(name)) {
TableImpl table = tables.get(name);
if (table == null) {
DatabaseException corruptionReason = corruptTables.get(name);
throw new IllegalArgumentException(corruptionReason.getMessage(), corruptionReason);
}
return table;
} else {
return null;
}
}
@Override
public TableImpl createTable(String name) throws IllegalArgumentException {
Utility.checkTableNameIsCorrect(name);
Path tablePath = databaseRoot.resolve(name);
if (tables.containsKey(name) && tables.get(name) != null) {
return null;
}
TableImpl newTable;
try {
newTable = TableImpl.createTable(tablePath);
} catch (DatabaseException exc) {
throw new IllegalArgumentException(exc.getMessage(), exc);
}
tables.put(name, newTable);
return newTable;
}
/**
* Scans database directory and reads all tables from it.
*
* @throws DatabaseException
*/
private void reloadTables() throws DatabaseException {
tables.clear();
try (DirectoryStream<Path> dirStream = Files.newDirectoryStream(databaseRoot)) {
for (Path tablePath : dirStream) {
String tableName = tablePath.getFileName().toString();
try {
TableImpl table = TableImpl.getTable(tablePath);
tables.put(tableName, table);
} catch (DatabaseException exc) {
// mark as corrupt
tables.put(tableName, null);
corruptTables.put(
tableName,
(exc instanceof TableCorruptException
? (TableCorruptException) exc
: new TableCorruptException(tableName, exc.getMessage(), exc)));
}
}
} catch (IOException exc) {
throw new DatabaseException("Failed to scan database directory", exc);
}
}