exec/java-exec/src/main/java/org/apache/drill/exec/metastore/MetastoreMetadataProviderManager.java

/*
 * 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.exec.metastore;

import org.apache.drill.exec.planner.common.DrillStatsTable;
import org.apache.drill.exec.record.metadata.schema.SchemaProvider;
import org.apache.drill.metastore.MetastoreRegistry;
import org.apache.drill.metastore.metadata.TableInfo;
import org.apache.drill.metastore.metadata.TableMetadataProvider;

/**
 * Implementation of {@link MetadataProviderManager} which uses Drill Metastore providers.
 */
public class MetastoreMetadataProviderManager implements MetadataProviderManager {

  private final MetastoreRegistry metastoreRegistry;
  private final TableInfo tableInfo;
  private final MetastoreMetadataProviderConfig config;

  private TableMetadataProvider tableMetadataProvider;

  private SchemaProvider schemaProvider;
  private DrillStatsTable statsProvider;

  public MetastoreMetadataProviderManager(MetastoreRegistry metastoreRegistry,
      TableInfo tableInfo, MetastoreMetadataProviderConfig config) {
    this.metastoreRegistry = metastoreRegistry;
    this.tableInfo = tableInfo;
    this.config = config;
  }

  @Override
  public void setSchemaProvider(SchemaProvider schemaProvider) {
    this.schemaProvider = schemaProvider;
  }

  @Override
  public SchemaProvider getSchemaProvider() {
    return schemaProvider;
  }

  @Override
  public void setStatsProvider(DrillStatsTable statsProvider) {
    this.statsProvider = statsProvider;
  }

  @Override
  public DrillStatsTable getStatsProvider() {
    return statsProvider;
  }

  @Override
  public void setTableMetadataProvider(TableMetadataProvider tableMetadataProvider) {
    this.tableMetadataProvider = tableMetadataProvider;
  }

  @Override
  public TableMetadataProvider getTableMetadataProvider() {
    return tableMetadataProvider;
  }

  public MetastoreRegistry getMetastoreRegistry() {
    return metastoreRegistry;
  }

  public TableInfo getTableInfo() {
    return tableInfo;
  }

  public MetastoreMetadataProviderConfig getConfig() {
    return config;
  }

  public boolean usesMetastore() {
    return true;
  }

  public static class MetastoreMetadataProviderConfig {
    private final boolean useSchema;
    private final boolean useStatistics;
    private final boolean fallbackToFileMetadata;

    public MetastoreMetadataProviderConfig(boolean useSchema, boolean useStatistics, boolean fallbackToFileMetadata) {
      this.useSchema = useSchema;
      this.useStatistics = useStatistics;
      this.fallbackToFileMetadata = fallbackToFileMetadata;
    }

    public boolean useSchema() {
      return useSchema;
    }

    public boolean useStatistics() {
      return useStatistics;
    }

    public boolean fallbackToFileMetadata() {
      return fallbackToFileMetadata;
    }
  }
}