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.
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  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.Collections;
  import java.util.List;
  import org.apache.beam.sdk.extensions.sql.impl.CatalogManagerSchema;
  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.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.SqlSetOption;
  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.parser.SqlParserPos;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.util.Pair;
  
  public class SqlUseCatalog extends SqlSetOption implements BeamSqlParser.ExecutableStatement {
    private final SqlIdentifier catalogName;
  
    private static final SqlOperator OPERATOR = new SqlSpecialOperator("USE CATALOG", SqlKind.OTHER);
  
    public SqlUseCatalog(SqlParserPos pos, String scope, SqlNode catalogName) {
      super(pos, scope, SqlDdlNodes.getIdentifier(catalogName, pos), null);
      this.catalogName = SqlDdlNodes.getIdentifier(catalogName, pos);
    }
  
    @Override
    public SqlOperator getOperator() {
      return OPERATOR;
    }
  
    @Override
    public List<SqlNode> getOperandList() {
      return Collections.singletonList(catalogName);
    }
  
    @Override
    public void execute(CalcitePrepare.Context context) {
      final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, catalogName);
      Schema schema = pair.left.schema;
  
      if (!(schema instanceof CatalogManagerSchema)) {
        throw SqlUtil.newContextException(
            catalogName.getParserPosition(),
            RESOURCE.internal(
                "Attempting to 'USE CATALOG' "
                    + catalogName
                    + "' with unexpected Calcite Schema of type "
                    + schema.getClass()));
      }
  
      ((CatalogManagerSchema) schema).useCatalog(catalogName);
    }
  }
  