Method map

src/main/java/com/cronutils/mapper/CronMapper.java:76–95

Maps given cron to target cron definition. @param cron - Instance to be mapped; if null a NullPointerException will be raised @return new Cron instance, never null;

(final Cron cron)

     * @return new Cron instance, never null;
     */
    public Cron map(final Cron cron) {
        Preconditions.checkNotNull(cron, "Cron must not be null");
        if(cron instanceof RebootCron){
            if(this.to.getCronNicknames().contains(CronNicknames.REBOOT)){
                return new RebootCron(this.to);
            } else {
                throw new IllegalArgumentException("The target cron definition does not support @reboot nickname");
            }
        }
        final List<CronField> fields = new ArrayList<>();
        for (final CronFieldName name : CronFieldName.values()) {
            if (mappings.containsKey(name)) {
                final CronField field = mappings.get(name).apply(cron.retrieve(name));
                if (field != null) {
                    fields.add(field);
                }
            }
        }
        return cronRules.apply(new SingleCron(to, fields)).validate();
    }

    /**
     * Creates a CronMapper that maps a cron4j expression to a quartz expression.