feature(uniapp商品): 商品业务代码调整

yudao-framework/yudao-common/src/main/java/cn/iocoder/yudao/framework/common/util/collection/CollectionUtils.java

@@ -173,6 +173,23 @@ public class CollectionUtils {
         return valueFunc.apply(t);
     }
 
+    public static <T, V extends Comparable<? super V>> V getMinValue(List<T> from, Function<T, V> valueFunc) {
+        if (CollUtil.isEmpty(from)) {
+            return null;
+        }
+        assert from.size() > 0; // 断言，避免告警
+        T t = from.stream().min(Comparator.comparing(valueFunc)).get();
+        return valueFunc.apply(t);
+    }
+
+    public static <T, V extends Comparable<? super V>> V getSumValue(List<T> from, Function<T, V> valueFunc, BinaryOperator<V> accumulator) {
+        if (CollUtil.isEmpty(from)) {
+            return null;
+        }
+        assert from.size() > 0; // 断言，避免告警
+        return from.stream().map(valueFunc).reduce(accumulator).get();
+    }
+
     public static <T> void addIfNotNull(Collection<T> coll, T item) {
         if (item == null) {
             return;