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.sql.SqlCreate;
  import org.apache.calcite.sql.SqlIdentifier;
  import org.apache.calcite.sql.SqlKind;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlOperator;
  import org.apache.calcite.sql.SqlSpecialOperator;
  import org.apache.calcite.sql.SqlWriter;
  import org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.calcite.util.ImmutableNullableList;
  
  import java.util.List;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Parse tree for {@code CREATE SCHEMA} statement.
   */
  public class SqlCreateSchema extends SqlCreate {
    public final SqlIdentifier name;
  
    private static final SqlOperator OPERATOR =
        new SqlSpecialOperator("CREATE SCHEMA", SqlKind.CREATE_SCHEMA);
  
    /** Creates a SqlCreateSchema. */
    SqlCreateSchema(SqlParserPos pos, boolean replace, boolean ifNotExists,
        SqlIdentifier name) {
      super(OPERATOR, pos, replace, ifNotExists);
      this.name = requireNonNull(name, "name");
    }
  
    @Override public List<SqlNode> getOperandList() {
      return ImmutableNullableList.of(name);
    }
  
    @Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      if (getReplace()) {
        writer.keyword("CREATE OR REPLACE");
      } else {
        writer.keyword("CREATE");
      }
      writer.keyword("SCHEMA");
      if (ifNotExists) {
        writer.keyword("IF NOT EXISTS");
      }
      name.unparse(writer, leftPrec, rightPrec);
    }
  }
  