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 org.apache.calcite.sql.validate.SqlValidator;
  import org.apache.calcite.sql.validate.SqlValidatorScope;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /**
   * The WITH clause of a query. It wraps a SELECT, UNION, or INTERSECT.
   */
  public class SqlWith extends SqlCall {
    public SqlNodeList withList;
    public SqlNode body;
  
    //~ Constructors -----------------------------------------------------------
  
    public SqlWith(SqlParserPos pos, SqlNodeList withList, SqlNode body) {
      super(pos);
      this.withList = withList;
      this.body = body;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public SqlKind getKind() {
      return SqlKind.WITH;
    }
  
    @Override public SqlOperator getOperator() {
      return SqlWithOperator.INSTANCE;
    }
  
    @Override public List<SqlNode> getOperandList() {
      return ImmutableList.of(withList, body);
    }
  
    @SuppressWarnings("assignment.type.incompatible")
    @Override public void setOperand(int i, @Nullable SqlNode operand) {
      switch (i) {
      case 0:
        withList = (SqlNodeList) operand;
        break;
      case 1:
        body = operand;
        break;
      default:
        throw new AssertionError(i);
      }
    }
  
    @Override public void validate(SqlValidator validator,
        SqlValidatorScope scope) {
      validator.validateWith(this, scope);
    }
  
    /**
     * SqlWithOperator is used to represent a WITH clause of a query. It wraps
     * a SELECT, UNION, or INTERSECT.
     */
    private static class SqlWithOperator extends SqlSpecialOperator {
      private static final SqlWithOperator INSTANCE = new SqlWithOperator();
  
      private SqlWithOperator() {
        // NOTE:  make precedence lower then SELECT to avoid extra parens
        super("WITH", SqlKind.WITH, 2);
      }
  
      //~ Methods ----------------------------------------------------------------
  
      @Override public void unparse(
          SqlWriter writer,
          SqlCall call,
          int leftPrec,
          int rightPrec) {
        final SqlWith with = (SqlWith) call;
        final SqlWriter.Frame frame =
            writer.startList(SqlWriter.FrameTypeEnum.WITH, "WITH", "");
        boolean isRecursive = ((SqlWithItem) with.withList.get(0)).recursive.booleanValue();
        if (isRecursive) {
          writer.keyword("RECURSIVE");
        }
        final SqlWriter.Frame frame1 = writer.startList("", "");
        for (SqlNode node : with.withList) {
          writer.sep(",");
          node.unparse(writer, 0, 0);
        }
        writer.endList(frame1);
        final SqlWriter.Frame frame2 =
            writer.startList(SqlWriter.FrameTypeEnum.WITH_BODY);
        with.body.unparse(writer,
            SqlWithOperator.INSTANCE.getLeftPrec(), SqlWithOperator.INSTANCE.getRightPrec());
        writer.endList(frame2);
        writer.endList(frame);
      }
  
  
      @SuppressWarnings("argument.type.incompatible")
      @Override public SqlCall createCall(@Nullable SqlLiteral functionQualifier,
          SqlParserPos pos, @Nullable SqlNode... operands) {
        return new SqlWith(pos, (SqlNodeList) operands[0], operands[1]);
      }
  
      @Override public void validateCall(SqlCall call,
          SqlValidator validator,
          SqlValidatorScope scope,
          SqlValidatorScope operandScope) {
        validator.validateWith((SqlWith) call, scope);
      }
    }
  }
  