/*
* 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.metadata.Metadata;
import com.facebook.presto.spi.ConnectorTableMetadata;
import com.facebook.presto.spi.InMemoryRecordSet;
import com.facebook.presto.spi.InMemoryRecordSet.Builder;
import com.facebook.presto.spi.RecordCursor;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SystemTable;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import com.google.inject.Inject;
import java.util.List;
import java.util.Map;
import static com.facebook.presto.metadata.MetadataUtil.TableMetadataBuilder.tableMetadataBuilder;
import static com.facebook.presto.metadata.MetadataUtil.columnTypeGetter;
import static com.facebook.presto.spi.type.VarcharType.VARCHAR;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.transform;
public class CatalogSystemTable
implements SystemTable
{
public static final SchemaTableName CATALOG_TABLE_NAME = new SchemaTableName("sys", "catalog");
public static final ConnectorTableMetadata CATALOG_TABLE = tableMetadataBuilder(CATALOG_TABLE_NAME)
.column("catalog_name", VARCHAR)
.column("connector_id", VARCHAR)
.build();
private final Metadata metadata;
@Inject
public CatalogSystemTable(Metadata metadata)
{
this.metadata = checkNotNull(metadata);
}
@Override
public boolean isDistributed()
{
return false;
}
@Override
public ConnectorTableMetadata getTableMetadata()
{
return CATALOG_TABLE;
}
@Override
public List<Type> getColumnTypes()
{
return ImmutableList.copyOf(transform(CATALOG_TABLE.getColumns(), columnTypeGetter()));
}
@Override
public RecordCursor cursor()
{
Builder table = InMemoryRecordSet.builder(CATALOG_TABLE);
for (Map.Entry<String, String> entry : metadata.getCatalogNames().entrySet()) {
table.addRow(entry.getKey(), entry.getValue());
}
return table.build().cursor();
}
}