plugin/checkstyle/src/main/java/se/jguru/nazgul/tools/plugin/checkstyle/CheckstyleReportGenerator.java
public boolean matchRule(AuditEvent event, String ruleName, String expectedMessage, String expectedSeverity) {
        if (!ruleName.equals(RuleUtil.getName(event))) {
            return false;
        }

        // check message too, for those that have a specific one.
        // like GenericIllegalRegexp and Regexp
        if (expectedMessage != null) {
            // event.getMessage() uses java.text.MessageFormat in its implementation.
            // Read MessageFormat Javadoc about single quote:
            // http://java.sun.com/j2se/1.4.2/docs/api/java/text/MessageFormat.html
            String msgWithoutSingleQuote = StringUtils.replace(expectedMessage, "'", "");

            return expectedMessage.equals(event.getMessage()) || msgWithoutSingleQuote.equals(event.getMessage());
        }
        // Check the severity. This helps to distinguish between
        // different configurations for the same rule, where each
        // configuration has a different severity, like JavadocMetod.
        // See also http://jira.codehaus.org/browse/MCHECKSTYLE-41
        if (expectedSeverity != null) {
            return expectedSeverity.equals(event.getSeverityLevel().getName());
        }

        return true;
    }
public boolean matchRule(AuditEvent event, String ruleName, String expectedMessage, String expectedSeverity) {
        if (!ruleName.equals(RuleUtil.getName(event))) {
            return false;
        }

        // check message too, for those that have a specific one.
        // like GenericIllegalRegexp and Regexp
        if (expectedMessage != null) {
            // event.getMessage() uses java.text.MessageFormat in its implementation.
            // Read MessageFormat Javadoc about single quote:
            // http://java.sun.com/j2se/1.4.2/docs/api/java/text/MessageFormat.html
            String msgWithoutSingleQuote = StringUtils.replace(expectedMessage, "'", "");

            return expectedMessage.equals(event.getMessage()) || msgWithoutSingleQuote.equals(event.getMessage());
        }
        // Check the severity. This helps to distinguish between
        // different configurations for the same rule, where each
        // configuration has a different severity, like JavadocMetod.
        // See also http://jira.codehaus.org/browse/MCHECKSTYLE-41
        if (expectedSeverity != null) {
            return expectedSeverity.equals(event.getSeverityLevel().getName());
        }

        return true;
    }
Check if a violation matches a rule.

@param event            the violation to check
@param ruleName         The name of the rule
@param expectedMessage  A message that, if it's not null, will be matched to the message from the violation
@param expectedSeverity A severity that, if it's not null, will be matched to the severity from the violation
@return The number of rule violations