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.linq4j.tree;
  
  /**
   * Node visitor.
   *
   * @param <R> Return type
   */
  public interface Visitor<R> {
    R visit(BinaryExpression binaryExpression);
    R visit(BlockStatement blockStatement);
    R visit(ClassDeclaration classDeclaration);
    R visit(ConditionalExpression conditionalExpression);
    R visit(ConditionalStatement conditionalStatement);
    R visit(ConstantExpression constantExpression);
    R visit(ConstructorDeclaration constructorDeclaration);
    R visit(DeclarationStatement declarationStatement);
    R visit(DefaultExpression defaultExpression);
    R visit(DynamicExpression dynamicExpression);
    R visit(FieldDeclaration fieldDeclaration);
    R visit(ForStatement forStatement);
    R visit(ForEachStatement forEachStatement);
    R visit(FunctionExpression functionExpression);
    R visit(GotoStatement gotoStatement);
    R visit(IndexExpression indexExpression);
    R visit(InvocationExpression invocationExpression);
    R visit(LabelStatement labelStatement);
    R visit(LambdaExpression lambdaExpression);
    R visit(ListInitExpression listInitExpression);
    R visit(MemberExpression memberExpression);
    R visit(MemberInitExpression memberInitExpression);
    R visit(MethodCallExpression methodCallExpression);
    R visit(MethodDeclaration methodDeclaration);
    R visit(NewArrayExpression newArrayExpression);
    R visit(NewExpression newExpression);
    R visit(ParameterExpression parameterExpression);
    R visit(SwitchStatement switchStatement);
    R visit(TernaryExpression ternaryExpression);
    R visit(ThrowStatement throwStatement);
    R visit(TryStatement tryStatement);
    R visit(TypeBinaryExpression typeBinaryExpression);
    R visit(UnaryExpression unaryExpression);
    R visit(WhileStatement whileStatement);
  }
  