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   * 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.beam.sdk.extensions.sql.impl.parser;
  
  import static org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Static.RESOURCE;
  
  import java.util.List;
  import org.apache.beam.sdk.extensions.sql.impl.CatalogManagerSchema;
  import org.apache.beam.sdk.extensions.sql.impl.CatalogSchema;
  import org.apache.beam.sdk.extensions.sql.impl.TableName;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.jdbc.CalcitePrepare;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.jdbc.CalciteSchema;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.schema.Schema;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlDrop;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlIdentifier;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlKind;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlNode;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlOperator;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlSpecialOperator;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlUtil;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlWriter;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Pair;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Splitter;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Lists;
  
  public class SqlDropDatabase extends SqlDrop implements BeamSqlParser.ExecutableStatement {
    private static final SqlOperator OPERATOR =
        new SqlSpecialOperator("DROP DATABASE", SqlKind.OTHER_DDL);
    private final SqlIdentifier databaseName;
    private final boolean cascade;
  
    public SqlDropDatabase(
        SqlParserPos pos, boolean ifExists, SqlIdentifier databaseName, boolean cascade) {
      super(OPERATOR, pos, ifExists);
      this.databaseName = databaseName;
      this.cascade = cascade;
    }
  
    @Override
    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      writer.keyword(getOperator().getName());
      if (ifExists) {
        writer.keyword("IF EXISTS");
      }
      databaseName.unparse(writer, leftPrec, rightPrec);
      if (cascade) {
        writer.keyword("CASCADE");
      } else {
        writer.keyword("RESTRICT");
      }
    }
  
    @Override
    public void execute(CalcitePrepare.Context context) {
      final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, databaseName);
      Schema schema = pair.left.schema;
  
      if (!(schema instanceof CatalogManagerSchema)) {
        throw SqlUtil.newContextException(
            databaseName.getParserPosition(),
            RESOURCE.internal(
                "Attempting to drop database '"
                    + databaseName
                    + "' with unexpected Calcite Schema of type "
                    + schema.getClass()));
      }
  
      List<String> components = Lists.newArrayList(Splitter.on(".").split(databaseName.toString()));
      TableName pathOverride = TableName.create(components, "");
      CatalogSchema catalogSchema = ((CatalogManagerSchema) schema).getCatalogSchema(pathOverride);
      catalogSchema.dropDatabase(databaseName, cascade, ifExists);
    }
  
    @Override
    public List<SqlNode> getOperandList() {
      return ImmutableList.of(databaseName);
    }
  }
  