private String contrast() {
        final ShenyuDictDO before = (ShenyuDictDO) getBefore();
        Objects.requireNonNull(before);
        final ShenyuDictDO after = (ShenyuDictDO) getAfter();
        Objects.requireNonNull(after);
        if (Objects.equals(before, after)) {
            return "it no change";
        }
        final StringBuilder builder = new StringBuilder();
        if (!Objects.equals(before.getDictName(), after.getDictName())) {
            builder.append(String.format("name[%s => %s] ", before.getDictName(), after.getDictName()));
        }
        if (!Objects.equals(before.getDictValue(), after.getDictValue())) {
            builder.append(String.format("value[%s => %s] ", before.getDictValue(), after.getDictValue()));
        }
        if (!Objects.equals(before.getDesc(), after.getDesc())) {
            builder.append(String.format("desc[%s => %s] ", before.getDesc(), after.getDesc()));
        }
        if (!Objects.equals(before.getType(), after.getType())) {
            builder.append(String.format("type[%s => %s] ", before.getType(), after.getType()));
        }
        if (!Objects.equals(before.getEnabled(), after.getEnabled())) {
            builder.append(String.format("enable[%s => %s] ", before.getEnabled(), after.getEnabled()));
        }
        if (!Objects.equals(before.getSort(), after.getSort())) {
            builder.append(String.format("sort[%s => %s] ", before.getSort(), after.getSort()));
        }
        return builder.toString();
    }
Create a new {@code DictChangedEvent}.operator is unknown.

@param source   Current dict state
@param before   Before the change dict state
@param type     event type
@param operator operator
shenyu-admin/src/main/java/org/apache/shenyu/admin/model/event/dict/DictChangedEvent.java