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;
  
  import org.apache.calcite.sql.parser.SqlParserPos;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A <code>SqlTableRef</code> is a node of a parse tree which represents
   * a table reference.
   *
   * <p>It can be attached with a sql hint statement, see {@link SqlHint} for details.
   */
  public class SqlTableRef extends SqlCall {
  
    //~ Instance fields --------------------------------------------------------
  
    private final SqlIdentifier tableName;
    private final SqlNodeList hints;
  
    //~ Static fields/initializers ---------------------------------------------
  
    private static final SqlOperator OPERATOR =
        new SqlSpecialOperator("TABLE_REF", SqlKind.TABLE_REF) {
          @Override public SqlCall createCall(
              @Nullable SqlLiteral functionQualifier,
              SqlParserPos pos, @Nullable SqlNode... operands) {
            return new SqlTableRef(pos,
                (SqlIdentifier) requireNonNull(operands[0], "tableName"),
                (SqlNodeList) requireNonNull(operands[1], "hints"));
          }
        };
  
    //~ Constructors -----------------------------------------------------------
  
    public SqlTableRef(SqlParserPos pos, SqlIdentifier tableName, SqlNodeList hints) {
      super(pos);
      this.tableName = tableName;
      this.hints = hints;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public SqlOperator getOperator() {
      return OPERATOR;
    }
  
    @Override public List<SqlNode> getOperandList() {
      return ImmutableList.of(tableName, hints);
    }
  
    @Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
      tableName.unparse(writer, leftPrec, rightPrec);
      if (!this.hints.isEmpty()) {
        writer.getDialect().unparseTableScanHints(writer, this.hints, leftPrec, rightPrec);
      }
    }
  }
  