Line data    Source code

       1             : // Copyright (C) 2021 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.query.change;
      16             : 
      17             : import static com.google.gerrit.server.index.change.ChangeField.HASHTAG_SPEC;
      18             : 
      19             : import dk.brics.automaton.RegExp;
      20             : import dk.brics.automaton.RunAutomaton;
      21             : 
      22             : public class RegexHashtagPredicate extends ChangeRegexPredicate {
      23             :   protected final RunAutomaton pattern;
      24             : 
      25             :   public RegexHashtagPredicate(String re) {
      26           4 :     super(HASHTAG_SPEC, re);
      27             : 
      28           4 :     if (re.startsWith("^")) {
      29           4 :       re = re.substring(1);
      30             :     }
      31             : 
      32           4 :     if (re.endsWith("$") && !re.endsWith("\\$")) {
      33           4 :       re = re.substring(0, re.length() - 1);
      34             :     }
      35             : 
      36           4 :     this.pattern = new RunAutomaton(new RegExp(re).toAutomaton());
      37           4 :   }
      38             : 
      39             :   @Override
      40             :   public boolean match(ChangeData cd) {
      41           2 :     if (cd.hashtags().isEmpty()) {
      42           0 :       return false;
      43             :     }
      44           2 :     return cd.hashtags().stream().anyMatch(ht -> pattern.run(ht));
      45             :   }
      46             : 
      47             :   @Override
      48             :   public int getCost() {
      49           0 :     return 1;
      50             :   }
      51             : }