liquibase-core/src/main/java/liquibase/logging/core/DefaultLoggerConfiguration.java
public LogLevel getLogLevel() {
        String logLevel = getLogLevelName();

        if ("debug".equalsIgnoreCase(logLevel)) {
            return LogLevel.DEBUG;
        } else if ("info".equalsIgnoreCase(logLevel)) {
            return LogLevel.INFO;
        } else if ("warning".equalsIgnoreCase(logLevel)) {
            return LogLevel.WARNING;
        } else if ("error".equalsIgnoreCase(logLevel) || "severe".equalsIgnoreCase(logLevel)) {
            return LogLevel.SEVERE;
        } else if ("off".equalsIgnoreCase(logLevel)) {
            return LogLevel.OFF;
        } else {
            throw new UnexpectedLiquibaseException("Unknown log level: " + logLevel+".  Valid levels are: debug, info, warning, error, off");
        }
    }
public LogLevel getLogLevel() {
        String logLevel = getLogLevelName();

        if ("debug".equalsIgnoreCase(logLevel)) {
            return LogLevel.DEBUG;
        } else if ("info".equalsIgnoreCase(logLevel)) {
            return LogLevel.INFO;
        } else if ("warning".equalsIgnoreCase(logLevel)) {
            return LogLevel.WARNING;
        } else if ("error".equalsIgnoreCase(logLevel) || "severe".equalsIgnoreCase(logLevel)) {
            return LogLevel.SEVERE;
        } else if ("off".equalsIgnoreCase(logLevel)) {
            return LogLevel.OFF;
        } else {
            throw new UnexpectedLiquibaseException("Unknown log level: " + logLevel+".  Valid levels are: debug, info, warning, error, off");
        }
    }
Transforms the strings DEBUG, INFO, WARNING, ERROR and OFF (case-insensitive) into the appropriate LogLevel.
@return a value from the LogLevel enum