| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.drill.metastore.rdbms.components.tables; |
| |
| import org.apache.drill.metastore.components.tables.TableMetadataUnit; |
| import org.apache.drill.metastore.metadata.MetadataType; |
| import org.apache.drill.metastore.rdbms.exception.RdbmsMetastoreException; |
| import org.apache.drill.metastore.rdbms.operate.RdbmsOperation; |
| import org.apache.drill.metastore.rdbms.transform.AbstractTransformer; |
| import org.apache.drill.metastore.rdbms.transform.MetadataMapper; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.Sets; |
| import org.jooq.Record; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Transformer implementation for RDBMS Metastore tables component. |
| */ |
| public class TablesTransformer extends AbstractTransformer<TableMetadataUnit> { |
| |
| private static final TablesTransformer INSTANCE = new TablesTransformer(); |
| |
| private final Map<MetadataType, MetadataMapper<TableMetadataUnit, ? extends Record>> MAPPERS = ImmutableMap.of( |
| MetadataType.TABLE, TablesMetadataMapper.TableMapper.get(), |
| MetadataType.SEGMENT, TablesMetadataMapper.SegmentMapper.get(), |
| MetadataType.FILE, TablesMetadataMapper.FileMapper.get(), |
| MetadataType.ROW_GROUP, TablesMetadataMapper.RowGroupMapper.get(), |
| MetadataType.PARTITION, TablesMetadataMapper.PartitionMapper.get() |
| ); |
| |
| public static TablesTransformer get() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public Set<MetadataMapper<TableMetadataUnit, ? extends Record>> toMappers(Set<MetadataType> metadataTypes) { |
| if (metadataTypes.contains(MetadataType.ALL)) { |
| return Sets.newHashSet(MAPPERS.values()); |
| } |
| |
| return metadataTypes.stream() |
| .map(this::toMapper) |
| .collect(Collectors.toSet()); |
| } |
| |
| @Override |
| public MetadataMapper<TableMetadataUnit, ? extends Record> toMapper(MetadataType metadataType) { |
| MetadataMapper<TableMetadataUnit, ? extends Record> mapper = MAPPERS.get(metadataType); |
| if (mapper == null) { |
| throw new RdbmsMetastoreException("Metadata mapper is absent for type: " + metadataType); |
| } |
| return mapper; |
| } |
| |
| @Override |
| public List<RdbmsOperation.Overwrite> toOverwrite(List<TableMetadataUnit> units) { |
| Map<String, List<TableMetadataUnit>> unitsByTables = units.stream() |
| .collect(Collectors.groupingBy(TableMetadataUnit::metadataType)); |
| |
| return unitsByTables.entrySet().stream() |
| .map(entry -> toOverwrite(entry.getKey(), entry.getValue())) |
| .collect(Collectors.toList()); |
| } |
| } |