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;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.lang.reflect.Type;
  import java.util.Objects;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Abstract implementation of {@link Node}.
   */
  public abstract class AbstractNode implements Node {
    public final ExpressionType nodeType;
    public final Type type;
  
    AbstractNode(ExpressionType nodeType, Type type) {
      this.type = requireNonNull(type, "type");
      this.nodeType = requireNonNull(nodeType, "nodeType");
    }
  
    /**
     * Gets the node type of this Expression.
     */
    public ExpressionType getNodeType() {
      return nodeType;
    }
  
    /**
     * Gets the static type of the expression that this Expression
     * represents.
     */
    public Type getType() {
      return type;
    }
  
    @Override public String toString() {
      ExpressionWriter writer = new ExpressionWriter(true);
      accept(writer, 0, 0);
      return writer.toString();
    }
  
    @Override public void accept(ExpressionWriter writer) {
      accept(writer, 0, 0);
    }
  
    void accept0(ExpressionWriter writer) {
      accept(writer, 0, 0);
    }
  
    void accept(ExpressionWriter writer, int lprec, int rprec) {
      throw new RuntimeException(
          "un-parse not supported: " + getClass() + ":" + nodeType);
    }
  
    @Override public Node accept(Shuttle shuttle) {
      throw new RuntimeException(
          "visit not supported: " + getClass() + ":" + nodeType);
    }
  
    public @Nullable Object evaluate(Evaluator evaluator) {
      throw new RuntimeException(
          "evaluation not supported: " + getClass() + ":" + nodeType);
    }
  
    @Override public boolean equals(@Nullable Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
  
      AbstractNode that = (AbstractNode) o;
      return nodeType == that.nodeType
          && type.equals(that.type);
    }
  
    @Override public int hashCode() {
      return Objects.hash(nodeType, type);
    }
  }
  