content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.csp.sentinel.slots.block.flow;
  
  import java.util.Comparator;
  
  import com.alibaba.csp.sentinel.slots.block.RuleConstant;
  
  /**
   * Comparator for flow rules.
   *
   * @author jialiang.linjl
   */
  public class FlowRuleComparator implements Comparator<FlowRule> {
  
      @Override
      public int compare(FlowRule o1, FlowRule o2) {
          // the FlowRule in Clustered mode will be put at the end.
          if (o1.isClusterMode() && !o2.isClusterMode()) {
              return 1;
          }
  
          if (!o1.isClusterMode() && o2.isClusterMode()) {
              return -1;
          }
  
          if (o1.getLimitApp() == null) {
              return 0;
          }
  
          if (o1.getLimitApp().equals(o2.getLimitApp())) {
              return 0;
          }
  
          if (RuleConstant.LIMIT_APP_DEFAULT.equals(o1.getLimitApp())) {
              return 1;
          } else if (RuleConstant.LIMIT_APP_DEFAULT.equals(o2.getLimitApp())) {
              return -1;
          } else {
              return 0;
          }
      }
  
  }
  