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.materialize;
  
  import com.google.common.collect.ImmutableList;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  /** A sequence of {@link Step}s from a root node (fact table) to another node
   * (dimension table), possibly via intermediate dimension tables. */
  class Path {
    final List<Step> steps;
    private final int id;
  
    Path(List<Step> steps, int id) {
      this.steps = ImmutableList.copyOf(steps);
      this.id = id;
    }
  
    @Override public int hashCode() {
      return id;
    }
  
    @Override public boolean equals(@Nullable Object obj) {
      return this == obj
          || obj instanceof Path
          && id == ((Path) obj).id;
    }
  }
  