/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.presto.connector.system;
import com.facebook.presto.connector.ConnectorId;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorTableHandle;
import com.facebook.presto.spi.ConnectorTableLayout;
import com.facebook.presto.spi.ConnectorTableLayoutHandle;
import com.facebook.presto.spi.ConnectorTableLayoutResult;
import com.facebook.presto.spi.ConnectorTableMetadata;
import com.facebook.presto.spi.Constraint;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SchemaTablePrefix;
import com.facebook.presto.spi.SystemTable;
import com.facebook.presto.spi.connector.ConnectorMetadata;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import static com.facebook.presto.connector.system.SystemColumnHandle.toSystemColumnHandles;
import static com.facebook.presto.metadata.MetadataUtil.findColumnMetadata;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.util.Objects.requireNonNull;
import static java.util.function.Function.identity;
import static java.util.stream.Collectors.toMap;
public class SystemTablesMetadata
implements ConnectorMetadata
{
private final ConnectorId connectorId;
private final Map<SchemaTableName, ConnectorTableMetadata> tables;
public SystemTablesMetadata(ConnectorId connectorId, Set<SystemTable> tables)
{
this.connectorId = requireNonNull(connectorId, "connectorId");
this.tables = tables.stream()
.map(SystemTable::getTableMetadata)
.collect(toMap(ConnectorTableMetadata::getTable, identity()));
}
private SystemTableHandle checkTableHandle(ConnectorTableHandle tableHandle)
{
SystemTableHandle systemTableHandle = (SystemTableHandle) tableHandle;
checkArgument(tables.containsKey(systemTableHandle.getSchemaTableName()));
return systemTableHandle;
}
@Override
public List<String> listSchemaNames(ConnectorSession session)
{
return tables.keySet().stream()
.map(SchemaTableName::getSchemaName)
.distinct()
.collect(toImmutableList());
}
@Override
public ConnectorTableHandle getTableHandle(ConnectorSession session, SchemaTableName tableName)
{
if (!tables.containsKey(tableName)) {
return null;
}
return SystemTableHandle.fromSchemaTableName(connectorId, tableName);
}
@Override
public List<ConnectorTableLayoutResult> getTableLayouts(ConnectorSession session, ConnectorTableHandle table, Constraint<ColumnHandle> constraint, Optional<Set<ColumnHandle>> desiredColumns)
{
SystemTableHandle tableHandle = (SystemTableHandle) table;
ConnectorTableLayout layout = new ConnectorTableLayout(new SystemTableLayoutHandle(tableHandle.getConnectorId(), tableHandle, constraint.getSummary()));
return ImmutableList.of(new ConnectorTableLayoutResult(layout, constraint.getSummary()));
}
@Override
public ConnectorTableLayout getTableLayout(ConnectorSession session, ConnectorTableLayoutHandle handle)
{
return new ConnectorTableLayout(handle);
}
@Override
public ConnectorTableMetadata getTableMetadata(ConnectorSession session, ConnectorTableHandle tableHandle)
{
SystemTableHandle systemTableHandle = checkTableHandle(tableHandle);
return tables.get(systemTableHandle.getSchemaTableName());
}
@Override
public List<SchemaTableName> listTables(ConnectorSession session, String schemaNameOrNull)
{
if (schemaNameOrNull == null) {
return ImmutableList.copyOf(tables.keySet());
}
return tables.keySet().stream()
.filter(table -> table.getSchemaName().equals(schemaNameOrNull))
.collect(toImmutableList());
}
@Override
public ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle)
{
SystemTableHandle systemTableHandle = checkTableHandle(tableHandle);
ConnectorTableMetadata tableMetadata = tables.get(systemTableHandle.getSchemaTableName());
String columnName = ((SystemColumnHandle) columnHandle).getColumnName();
ColumnMetadata columnMetadata = findColumnMetadata(tableMetadata, columnName);
checkArgument(columnMetadata != null, "Column %s on table %s does not exist", columnName, tableMetadata.getTable());
return columnMetadata;
}
@Override
public Map<String, ColumnHandle> getColumnHandles(ConnectorSession session, ConnectorTableHandle tableHandle)
{
SystemTableHandle systemTableHandle = checkTableHandle(tableHandle);
return toSystemColumnHandles(systemTableHandle.getConnectorId(), tables.get(systemTableHandle.getSchemaTableName()));
}
@Override
public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix)
{
requireNonNull(prefix, "prefix is null");
ImmutableMap.Builder<SchemaTableName, List<ColumnMetadata>> builder = ImmutableMap.builder();
for (Entry<SchemaTableName, ConnectorTableMetadata> entry : tables.entrySet()) {
if (prefix.matches(entry.getKey())) {
builder.put(entry.getKey(), entry.getValue().getColumns());
}
}
return builder.build();
}
}