Line data    Source code

       1             : // Copyright (C) 2015 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.account;
      16             : 
      17             : import com.google.common.collect.ComparisonChain;
      18             : import com.google.common.collect.Ordering;
      19             : import com.google.gerrit.extensions.common.AccountInfo;
      20             : import java.util.Comparator;
      21             : 
      22             : public class AccountInfoComparator extends Ordering<AccountInfo>
      23             :     implements Comparator<AccountInfo> {
      24         104 :   public static final AccountInfoComparator ORDER_NULLS_FIRST = new AccountInfoComparator();
      25         104 :   public static final AccountInfoComparator ORDER_NULLS_LAST =
      26         104 :       new AccountInfoComparator().setNullsLast();
      27             : 
      28             :   private boolean nullsLast;
      29             : 
      30             :   private AccountInfoComparator() {}
      31             : 
      32             :   private AccountInfoComparator setNullsLast() {
      33         104 :     this.nullsLast = true;
      34         104 :     return this;
      35             :   }
      36             : 
      37             :   @Override
      38             :   public int compare(AccountInfo a, AccountInfo b) {
      39          35 :     return ComparisonChain.start()
      40          35 :         .compare(a.name, b.name, createOrdering())
      41          35 :         .compare(a.email, b.email, createOrdering())
      42          35 :         .compare(a._accountId, b._accountId, createOrdering())
      43          35 :         .result();
      44             :   }
      45             : 
      46             :   private <S extends Comparable<?>> Ordering<S> createOrdering() {
      47          35 :     if (nullsLast) {
      48           3 :       return Ordering.natural().nullsLast();
      49             :     }
      50          32 :     return Ordering.natural().nullsFirst();
      51             :   }
      52             : }