content: /*
   * 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.sdk.util.Preconditions.checkStateNotNull;
  import static org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Static.RESOURCE;
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkState;
  
  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.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.SqlCreate;
  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;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  public class SqlCreateDatabase extends SqlCreate implements BeamSqlParser.ExecutableStatement {
    private final SqlIdentifier databaseName;
    private static final SqlOperator OPERATOR =
        new SqlSpecialOperator("CREATE DATABASE", SqlKind.OTHER_DDL);
  
    public SqlCreateDatabase(
        SqlParserPos pos, boolean replace, boolean ifNotExists, SqlIdentifier databaseName) {
      super(OPERATOR, pos, replace, ifNotExists);
      this.databaseName = databaseName;
    }
  
    @Override
    public List<SqlNode> getOperandList() {
      ImmutableList.Builder<SqlNode> operands = ImmutableList.builder();
      operands.add(databaseName);
      return operands.build();
    }
  
    @Override
    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      writer.keyword("CREATE");
      if (getReplace()) {
        writer.keyword("OR REPLACE");
      }
      writer.keyword("DATABASE");
      if (ifNotExists) {
        writer.keyword("IF NOT EXISTS");
      }
      databaseName.unparse(writer, leftPrec, rightPrec);
    }
  
    @Override
    public void execute(CalcitePrepare.Context context) {
      final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, databaseName);
      Schema schema = pair.left.schema;
  
      List<String> components = Lists.newArrayList(Splitter.on('.').split(databaseName.toString()));
      @Nullable
      String catalogName = components.size() > 1 ? components.get(components.size() - 2) : null;
  
      if (!(schema instanceof CatalogManagerSchema)) {
        throw SqlUtil.newContextException(
            databaseName.getParserPosition(),
            RESOURCE.internal(
                "Attempting to create database '"
                    + databaseName
                    + "' with unexpected Calcite Schema of type "
                    + schema.getClass()));
      }
  
      CatalogManagerSchema catalogManagerSchema = (CatalogManagerSchema) schema;
      CatalogSchema catalogSchema = catalogManagerSchema.getCurrentCatalogSchema();
      // override if a catalog name is present
      if (catalogName != null) {
        Schema overridden =
            checkStateNotNull(
                catalogManagerSchema.getSubSchema(catalogName),
                "Could not find Calcite Schema for catalog '%s'.",
                catalogName);
        checkState(
            overridden instanceof CatalogSchema,
            "Catalog '%s' had unexpected Calcite Schema of type %s. Expected type: %s.",
            catalogName,
            overridden.getClass(),
            CatalogSchema.class.getSimpleName());
        catalogSchema = (CatalogSchema) overridden;
      }
  
      catalogSchema.createDatabase(databaseName, ifNotExists);
    }
  }
  