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.calcite.sql.ddl;
  
  import org.apache.calcite.jdbc.CalcitePrepare;
  import org.apache.calcite.sql.SqlDrop;
  import org.apache.calcite.sql.SqlIdentifier;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlOperator;
  import org.apache.calcite.sql.SqlWriter;
  import org.apache.calcite.sql.parser.SqlParserPos;
  
  import com.google.common.collect.ImmutableList;
  
  import java.util.List;
  
  /**
   * Base class for parse trees of {@code DROP TABLE}, {@code DROP VIEW},
   * {@code DROP MATERIALIZED VIEW} and {@code DROP TYPE} statements.
   */
  public abstract class SqlDropObject extends SqlDrop {
    public final SqlIdentifier name;
  
    /** Creates a SqlDropObject. */
    SqlDropObject(SqlOperator operator, SqlParserPos pos, boolean ifExists,
        SqlIdentifier name) {
      super(operator, pos, ifExists);
      this.name = name;
    }
  
    @Override public List<SqlNode> getOperandList() {
      return ImmutableList.of(name);
    }
  
    @Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      writer.keyword(getOperator().getName()); // "DROP TABLE" etc.
      if (ifExists) {
        writer.keyword("IF EXISTS");
      }
      name.unparse(writer, leftPrec, rightPrec);
    }
  
    public void execute(CalcitePrepare.Context context) {
    }
  }
  