fix support custom reader for enum, for issue #2688 and issue #2726 (#…

…2727)

* fix support custom reader for enum, for issue #2688 and issue #2726

core/src/main/java/com/alibaba/fastjson2/util/TypeUtils.java

@@ -1482,10 +1482,10 @@ public static <T> T cast(Object obj, Class<T> targetClass, ObjectReaderProvider
                 if (obj instanceof Integer) {
                     int intValue = (Integer) obj;
                     return (T) ((ObjectReaderImplEnum) objectReader).of(intValue);
-                } else {
-                    JSONReader jsonReader = JSONReader.of(JSON.toJSONString(obj));
-                    return (T) objectReader.readObject(jsonReader, null, null, 0);
                 }
+            } else {
+                JSONReader jsonReader = JSONReader.of(JSON.toJSONString(obj));
+                return (T) objectReader.readObject(jsonReader, targetClass, null, 0);
             }
         }
 

core/src/test/java/com/alibaba/fastjson2/issues_2700/Issue2712.java

@@ -1,4 +1,4 @@
-package com.alibaba.fastjson2.issues_2600;
+package com.alibaba.fastjson2.issues_2700;
 
 import com.alibaba.fastjson2.JSON;
 import com.alibaba.fastjson2.JSONWriter;

core/src/test/java/com/alibaba/fastjson2/issues_2700/Issue2726.java

@@ -0,0 +1,75 @@
+package com.alibaba.fastjson2.issues_2700;
+
+import com.alibaba.fastjson2.JSONArray;
+import com.alibaba.fastjson2.JSONObject;
+import com.alibaba.fastjson2.JSONReader;
+import com.alibaba.fastjson2.annotation.JSONType;
+import com.alibaba.fastjson2.reader.ObjectReader;
+import lombok.Getter;
+import lombok.Setter;
+import org.junit.jupiter.api.Test;
+
+import java.lang.reflect.Type;
+import java.util.Objects;
+
+import static com.alibaba.fastjson2.issues_2700.Issue2726.ElementType.DIV;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2726 {
+    @Test
+    public void test() {
+        String json = "[{\"elementType\":1}]";
+        JSONArray jsonArray = JSONArray.parseArray(json);
+        assertEquals(DIV, ((JSONObject) jsonArray.get(0)).to(Bean.class).getElementType());
+        assertEquals(DIV, jsonArray.toJavaList(Bean.class).get(0).getElementType());
+    }
+
+    @Getter
+    @Setter
+    static class Bean {
+        private ElementType elementType;
+    }
+
+    @JSONType(writeEnumAsJavaBean = true, deserializer = FastJsonEnumDeserializer.class)
+    @Getter
+    enum ElementType {
+        HTML("HTML"),
+        DIV("DIV");
+
+        final String name;
+
+        ElementType(String name) {
+            this.name = name;
+        }
+    }
+
+    @SuppressWarnings("rawtypes")
+    static class FastJsonEnumDeserializer
+            implements ObjectReader<Object> {
+        @Override
+        public Object readObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
+            if (jsonReader.nextIfNull()) {
+                return null;
+            }
+            Class fieldClass = (Class) fieldType;
+            Object value = jsonReader.readAny();
+            if (fieldClass.isEnum()) {
+                Enum[] enumConstants = (Enum[]) fieldClass.getEnumConstants();
+                if (value instanceof Integer) {
+                    for (Enum enumConstant : enumConstants) {
+                        if (Objects.equals(enumConstant.ordinal(), value)) {
+                            return enumConstant;
+                        }
+                    }
+                } else {
+                    for (Enum enumConstant : enumConstants) {
+                        if (Objects.equals(enumConstant.name(), value)) {
+                            return enumConstant;
+                        }
+                    }
+                }
+            }
+            return null;
+        }
+    }
+}