import org.apache.flink.cep.PatternStream; //导入依赖的package包/类
private static <TWarningType extends IWarning> DataStream<TWarningType> toWarningStream(DataStream<LocalWeatherData> localWeatherDataDataStream, IWarningPattern<LocalWeatherData, TWarningType> warningPattern) {
    PatternStream<LocalWeatherData> tempPatternStream = CEP.pattern(
            localWeatherDataDataStream.keyBy(new KeySelector<LocalWeatherData, String>() {
                @Override
                public String getKey(LocalWeatherData localWeatherData) throws Exception {
                    return localWeatherData.getStation().getWban();
                }
            }),
            warningPattern.getEventPattern());

    DataStream<TWarningType> warnings = tempPatternStream.select(new PatternSelectFunction<LocalWeatherData, TWarningType>() {
        @Override
        public TWarningType select(Map<String, List<LocalWeatherData>> map) throws Exception {
            return warningPattern.create(map);
        }
    }, new GenericTypeInfo<TWarningType>(warningPattern.getWarningTargetType()));

    return warnings;
}