/*
 * Copyright 2018 Confluent Inc.
 *
 * Licensed under the Confluent Community License (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.confluent.io/confluent-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 */

package io.confluent.ksql.planner.plan;

public class PlanVisitor<C, R> {

  protected R visitPlan(final PlanNode node, final C context) {
    return null;
  }

  protected R visitFilter(final FilterNode node, final C context) {
    return visitPlan(node, context);
  }

  protected R visitProject(final ProjectNode node, final C context) {
    return visitPlan(node, context);
  }

  protected R visitStructuredDataSourceNode(final StructuredDataSourceNode node, final C context) {
    return visitPlan(node, context);
  }

  protected R visitAggregate(final AggregateNode node, final C context) {
    return visitPlan(node, context);
  }

  protected R visitJoin(final JoinNode node, final C context) {
    return visitPlan(node, context);
  }

  protected R visitOutput(final OutputNode node, final C context) {
    return visitPlan(node, context);
  }

}