过滤器链模式

类结构图

过滤器链

public class LabItemFilterChain {

    private List<LabItemFilter> labItemFilters;
    int pos = 0;

    public LabItemFilterChain() {
        this.labItemFilters = new LinkedList<>();
    }

    public void addFilter(LabItemFilter labItemFilter) {
        labItemFilters.add(labItemFilter);
    }

    public LabItemRange doFilter(Report request,List<LabItemRange> response) {
        LabItemRange range = null;
        if (request==null|| CollectionUtils.isEmpty(response)) {
            return null;
        }
        if (pos<labItemFilters.size()) {
            range = labItemFilters.get(pos++).doFilter(request, response, this);
            if (range!=null) {
                return range;
            }
        }
        return null;
    }
}

 过滤器接口及默认比较方法

public interface LabItemFilter {

    LabItemRange doFilter(Report report, List<LabItemRange> itemRanges,LabItemFilterChain filterChain);

    default boolean compareCode(LabItemRange itemRange,Report report){
        if (itemRange.getSampleCode()==null||report.getSampleCode()==null) {
            return false;
        }
        return Objects.equals(itemRange.getSampleCode(),report.getSampleCode());
    }

    default boolean compareAge(LabItemRange itemRange,Report report){
        Integer age = report.getAge();
        Integer ageUnit = report.getAgeUnit();
        Integer lowAge = itemRange.getLowAge();
        Integer highAge = itemRange.getHighAge();
        Integer lowAgeUnit = itemRange.getLowAgeUnit();
        Integer highAgeUnit = itemRange.getHighAgeUnit();

        if (age==null||ageUnit==null||lowAge==null||highAge==null||lowAgeUnit==null||highAgeUnit==null) {
            return false;
        }

        long ageSecond = age * AlisDateUtils.getSecondsByAgeUnit(ageUnit);
        long lowAgeSecond = lowAge * AlisDateUtils.getSecondsByAgeUnit(lowAgeUnit);
        long hignAgeSecond = highAge * AlisDateUtils.getSecondsByAgeUnit(highAgeUnit);
        return ageSecond>=lowAgeSecond&&ageSecond<=hignAgeSecond;
    }

    default boolean compareSex(LabItemRange itemRange,Report report){
        if (itemRange.getSex()==null||report.getSex()==null) {
            return false;
        }
        return Objects.equals(itemRange.getSex(),report.getSex());
    }
}

接口的各种实现

public class LabItemByAgeFilter implements LabItemFilter{
    @Override
    public LabItemRange doFilter(Report report, List<LabItemRange> itemRanges, LabItemFilterChain filterChain) {
        for (LabItemRange itemRange : itemRanges) {
            if (Objects.isNull(itemRange.getSampleCode())&&Objects.isNull(itemRange.getSex())&&compareAge(itemRange,report)) {
                return itemRange;
            }
        }
        return filterChain.doFilter(report, itemRanges);
    }
}

public class LabItemByCodeAgeFilter implements LabItemFilter{
    @Override
    public LabItemRange doFilter(Report report, List<LabItemRange> itemRanges, LabItemFilterChain filterChain) {
        for (LabItemRange itemRange : itemRanges) {
            if (Objects.isNull(itemRange.getSex())&&compareCode(itemRange,report)&&compareAge(itemRange,report)) {
                return itemRange;
            }
        }
        return filterChain.doFilter(report, itemRanges);
    }
}

调用

        LabItemFilterChain chain = new LabItemFilterChain();
		chain.addFilter(new LabItemByCodeAgeSexFilter());
		chain.addFilter(new LabItemByCodeAgeFilter());
		chain.addFilter(new LabItemByCodeSexFilter());
		chain.addFilter(new LabItemByCodeFilter());
		chain.addFilter(new LabItemByAgeSexFilter());
		chain.addFilter(new LabItemByAgeFilter());
		chain.addFilter(new LabItemBySexFilter());
		chain.addFilter(new LabItemDefaultFilter());

		LabItemRange labItemRange = chain.doFilter(report, labItemRangeList);
		return labItemRange;

匿名方法实现