对象比较的优化

commons/src/main/java/com/jzg/commons/util/comparble/DiffUtils.java

@@ -33,40 +33,35 @@ public class DiffUtils {
      */
     @SneakyThrows
     public static <T> List<DiffResult> diff(T a, T b) {
-        if (equals(a, b)) {
-            return Collections.EMPTY_LIST;
+        if (a == null && b == null) return Collections.emptyList();
+        if (a != null && b != null && !a.getClass().equals(b.getClass())) {
+            throw new IllegalArgumentException("a 与 b 必须是相同类型");
         }
 
-        // 获取并缓存一个类中需要对比的字段
-        Map<String, Field> cachedDiffPropertyMap = DIFF_PROPERTY_CACHE.computeIfAbsent((a != null ? a : b).getClass(),
-                clazz -> {
-                    Map<String, Field> diffPropertyMap = new HashMap<>();
-                    for (Field field : clazz.getDeclaredFields()) {
-                        DiffProperty diffProperty = field.getAnnotation(DiffProperty.class);
-                        if (diffProperty != null) {
-                            field.setAccessible(true);
-                            String name = diffProperty.name();
-                            if (name.isEmpty()) {
-                                name = field.getName();
-                            }
-                            diffPropertyMap.put(name, field);
-                        }
-                    }
-                    return diffPropertyMap;
-                });
+        Class<?> clazz = (a != null ? a : b).getClass();
+        Map<String, Field> cachedDiffPropertyMap = DIFF_PROPERTY_CACHE.computeIfAbsent(clazz, clz -> {
+            Map<String, Field> map = new HashMap<>();
+            for (Field field : clz.getDeclaredFields()) {
+                DiffProperty prop = field.getAnnotation(DiffProperty.class);
+                if (prop != null) {
+                    field.setAccessible(true);
+                    String name = prop.name().isEmpty() ? field.getName() : prop.name();
+                    map.put(name, field);
+                }
+            }
+            return map;
+        });
 
-        // 新老对象，属性值进行对比，并将对比结果，不同的进行返回
-        List<DiffResult> diffResultList = new ArrayList<>();
-        for (Map.Entry<String, Field> fieldEntry : cachedDiffPropertyMap.entrySet()) {
-            Field field = fieldEntry.getValue();
-            // field.get(a) 获取a对象field这个属性名的属性值!
-            Object aValue = a == null ? null : field.get(a);
-            Object bValue = b == null ? null : field.get(b);
-            if (!equals(aValue, bValue)) {
-                diffResultList.add(new DiffResult(field.getName(), fieldEntry.getKey(), aValue, bValue));
+        List<DiffResult> result = new ArrayList<>();
+        for (Map.Entry<String, Field> entry : cachedDiffPropertyMap.entrySet()) {
+            Field field = entry.getValue();
+            Object aVal = (a == null) ? null : field.get(a);
+            Object bVal = (b == null) ? null : field.get(b);
+            if (!Objects.equals(aVal, bVal)) {
+                result.add(new DiffResult(field.getName(), entry.getKey(), aVal, bVal));
             }
         }
-        return diffResultList;
+        return result;
     }
 
     /**