KeyValueHelper 自定方法优化convertMap 空指针报错

桃扇骨 2022-04-10 08:26 138阅读 0赞

原来的代码：

KeyValueHelper.setMessageText(orderList, orderDetail::getlMateria, orderDetail::setSubclass, convertMap(materiaMap, materiaMap::getSubclass));

KeyValueHelper.setMessageText(rmaReturnDetailSnList, RmaReturnDetailSn::getMaterialSn, RmaReturnDetailSn::setSupplierSn,
            KeyValueHelper.extractKVMap(snTempVOS, SNTempVO::getSnCode, SNTempVO::getSupplierSn));

支持以上两种为map和List

就是获取各种根据code查询出来的name时批量set的方法，基本思路就是讲查询回来的的list根据code分组得到map 然后根据

key值去除map 速度比而且方便

但是由于 materiaMap::getSubclass值可能null，所以会报空指针

KeyValueHelper.setMessageText(orderList, orderDetail::getlMateria, orderDetail::setSubclass, convertMap(materiaMap, materiaMap::getSubclass));
    
    
     public static <T> void setMessageText(Collection<T> objects, Function<T, ? extends Object> keyGetter, BiConsumer<T, String> valueSetter, Map<Object, String> kvs) {
            Iterator var4 = objects.iterator();
    
            while(var4.hasNext()) {
                T object = var4.next();
                setMessageText(object, keyGetter, valueSetter, kvs);
            }
    
        }
    
    private static <K extends Object, V1, V2> Map<Object, V2> convertMap(Map<K, V1> original, Function<V1, V2> converter) {
            Map<Object, V2> result = original.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, kv1Entry -> {
                return converter.apply(kv1Entry.getValue());
            }));
            return result;
        }

改为

private static <K extends Object, V1, V2> Map<Object, V2> convertMap(Map<K, V1> original, Function<V1, V2> converter) {
            if(MapUtils.isEmpty(original)){
                return Collections.emptyMap();
            }
            Map<Object, V2> result = new HashMap<>();;
    
            for (Map.Entry<K, V1> kv1Entry : original.entrySet()) {
                if(kv1Entry.getKey() != null && kv1Entry.getValue() !=null){
                    result.put(kv1Entry.getKey(), converter.apply(kv1Entry.getValue()));
                }
            }
    
            return result;
        }

public class KeyValueHelper {
        public KeyValueHelper() {
        }
    
        public static void main(String[] args) throws Exception {
            SimpleIdGenerator simpleIdGenerator = null;
            Range<Long> longRange = ((SimpleIdGenerator)simpleIdGenerator).nextIds(Object.class, 100L);
    
            for(long i = (Long)longRange.getLowerBound(); i < (Long)longRange.getUpperBound(); ++i) {
                ;
            }
    
        }
    
        public static <K, E> Map<K, String> extractKVMap(Collection<E> objects, Function<? super E, K> keyGetter, Function<? super E, String> valueGetter) {
            if (CollectionUtils.isEmpty(objects)) {
                return Collections.emptyMap();
            } else {
                Map<K, String> kvs = new HashMap();
                Iterator var4 = objects.iterator();
    
                while(var4.hasNext()) {
                    E object = var4.next();
                    kvs.put(keyGetter.apply(object), valueGetter.apply(object));
                }
    
                return kvs;
            }
        }
    
        public static <T> void setMessageText(T object, Function<? super T, ? extends Object> keyGetter, BiConsumer<T, String> valueSetter, Map<Object, String> kvs) {
            Object key = keyGetter.apply(object);
            if (key != null) {
                valueSetter.accept(object, kvs.get(key));
            }
        }
    
        public static <T> void setMessageText(Collection<T> objects, Function<T, ? extends Object> keyGetter, BiConsumer<T, String> valueSetter, Map<Object, String> kvs) {
            Iterator var4 = objects.iterator();
    
            while(var4.hasNext()) {
                T object = var4.next();
                setMessageText(object, keyGetter, valueSetter, kvs);
            }
    
        }

private static <K extends Object, V1, V2> Map<Object, V2> convertMap(Map<K, V1> original, Function<V1, V2> converter) \{  
        if(MapUtils.isEmpty(original))\{  
            return Collections.emptyMap();  
        \}  
        Map<Object, V2> result = new HashMap<>();;

for (Map.Entry<K, V1> kv1Entry : original.entrySet()) \{  
            if(kv1Entry.getKey() != null && kv1Entry.getValue() !=null)\{  
                result.put(kv1Entry.getKey(), converter.apply(kv1Entry.getValue()));  
            \}  
        \}

return result;  
    \}

}