code: ///////////////////////////////////////////////////////////////////////////////////////////////
  // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
  // Copyright (C) 2001-2023 the original author or authors.
  //
  // This library is free software; you can redistribute it and/or
  // modify it under the terms of the GNU Lesser General Public
  // License as published by the Free Software Foundation; either
  // version 2.1 of the License, or (at your option) any later version.
  //
  // This library is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.bdd;
  
  import java.util.Objects;
  import java.util.regex.Pattern;
  
  public final class TestInputViolation implements Comparable<TestInputViolation> {
  
      /** Pattern to match the symbol: "{". */
      private static final Pattern OPEN_CURLY_PATTERN = Pattern.compile("\\{");
  
      /** Pattern to match the symbol: "(". */
      private static final Pattern OPEN_PAREN_PATTERN = Pattern.compile("\\(");
  
      /** Pattern to match the symbol: ")". */
      private static final Pattern CLOSE_PAREN_PATTERN = Pattern.compile("\\)");
  
      /** Parsed violation line number. */
      private final int lineNo;
  
      /** Parsed violation message. */
      private final String message;
  
      /**
       * Creates a new {@code TestInputViolation} instance.
       *
       * @param lineNo the violation line number.
       * @param message the violation message.
       */
      public TestInputViolation(int lineNo, String message) {
          this.lineNo = lineNo;
          this.message = message;
      }
  
      /**
       * Gets the violation line number.
       *
       * @return the violation line number.
       */
      public int getLineNo() {
          return lineNo;
      }
  
      /**
       * Gets the violation message.
       *
       * @return the violation message.
       */
      public String getMessage() {
          return message;
      }
  
      /**
       * Creates regex string to match the violation message format.
       *
       * @return the regex string.
       */
      public String toRegex() {
          String regex = lineNo + ":(?:\\d+:)?\\s.*";
          if (message != null) {
              String rawMessage = message;
              rawMessage = OPEN_CURLY_PATTERN.matcher(rawMessage).replaceAll("\\\\{");
              rawMessage = OPEN_PAREN_PATTERN.matcher(rawMessage).replaceAll("\\\\(");
              rawMessage = CLOSE_PAREN_PATTERN.matcher(rawMessage).replaceAll("\\\\)");
              regex += rawMessage + ".*";
          }
          return regex;
      }
  
      @Override
      public int compareTo(TestInputViolation testInputViolation) {
          final int result;
          if (message != null && lineNo == testInputViolation.lineNo) {
              result = testInputViolation.message.compareTo(message);
          }
          else {
              result = Integer.compare(lineNo, testInputViolation.lineNo);
          }
          return result;
      }
  
      @Override
      public int hashCode() {
          return Objects.hash(lineNo);
      }
  
      @Override
      public boolean equals(Object object) {
          return getClass() == object.getClass() && compareTo((TestInputViolation) object) == 0;
      }
  }
  