content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * Licensed 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 com.alibaba.graphscope.common.ir.type;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.Objects;
  
  public class GraphProperty {
      public static final String LEN_KEY = "~len";
      public static final String ALL_KEY = "~all";
      public static final String ID_KEY = "~id";
      public static final String LABEL_KEY = "~label";
      public static final String START_V_KEY = "~start_v";
      public static final String END_V_KEY = "~end_v";
  
      private final Opt opt;
      private final @Nullable GraphNameOrId key;
  
      public GraphProperty(Opt opt) {
          this.opt = opt;
          this.key = null;
      }
  
      public GraphProperty(GraphNameOrId key) {
          this.key = Objects.requireNonNull(key);
          this.opt = Opt.KEY;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          GraphProperty that = (GraphProperty) o;
          return opt == that.opt && Objects.equals(key, that.key);
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(opt, key);
      }
  
      public Opt getOpt() {
          return opt;
      }
  
      public @Nullable GraphNameOrId getKey() {
          return key;
      }
  
      public enum Opt {
          ID,
          LABEL,
          LEN,
          ALL,
          KEY,
          START_V,
          END_V
      }
  }
  