feat: implement map-object conversion with a safer method

If you still want to use the unsafe version, please use
com.onixbyte:map-util-unsafe.

Author: zihluwang

devkit-utils/src/main/java/com/onixbyte/devkit/utils/MapUtil.java

@@ -31,7 +31,7 @@
  * Please see documentation for more information.
  *
  * @author zihluwang
- * @version 1.4.2
+ * @version 1.7.0
  * @since 1.0.0
  */
 @Slf4j
@@ -40,81 +40,31 @@ public final class MapUtil {
     /**
      * Converts an object to a map by mapping the field names to their corresponding values.
      *
-     * @param <T>      the type of the object
-     * @param entity   the object to be converted to a map
-     * @param adapters adapts the entity for mapping to a map
+     * @param <T>     the type of the object
+     * @param entity  the object to be converted to a map
+     * @param adapter adapts the entity for mapping to a map
      * @return a map representing the fields and their values of the object
      */
-    public static <T> Map<String, Object> objectToMap(T entity,
-                                                      Map<String, ObjectMapAdapter<T, ?>> adapters) {
-        var resultMap = new HashMap<String, Object>();
-        adapters.forEach((fieldName, adapter) -> resultMap.put(fieldName, adapter.fetch(entity)));
-        return resultMap;
+    public static <T> Map<String, Object> objectToMap(T entity, ObjectMapAdapter<T> adapter) {
+        return adapter.toMap(entity);
     }
 
     /**
      * Converts a map to an object of the specified type by setting the field values using the
      * map entries.
      *
      * @param objectMap the map representing the fields and their values
-     * @param entity    an empty entity of the target class
-     * @param adapters  the adapters to execute the setter for the entity
+     * @param adapter   the adapter to execute the setter for the entity
      * @param <T>       the type of the object to be created
      * @return an object of the specified type with the field values set from the map
      */
-    public static <T> T mapToObject(Map<String, Object> objectMap,
-                                    T entity,
-                                    Map<String, ObjectMapAdapter<T, ?>> adapters) {
-        adapters.forEach((fieldName, adapter) -> Optional.ofNullable(objectMap)
-                .map((data) -> data.get(fieldName))
-                .ifPresent((fieldValue) -> adapter.setValue(entity, fieldValue)));
-        return entity;
+    public static <T> T mapToObject(Map<String, Object> objectMap, ObjectMapAdapter<T> adapter) {
+        return adapter.toObject(objectMap);
     }
 
     /**
-     * Retrieves the value of a field from an object using reflection.
-     *
-     * @param <E>     the type of the entity
-     * @param <T>     the type of the field value
-     * @param entity  the object from which to retrieve the field value
-     * @param adapter the adapter to execute the getter
-     * @return the value of the field in the object, or null if the field does not exist or cannot
-     * be accessed
+     * Private constructor prevent class being instantiated.
      */
-    public static <E, T> T getFieldValue(E entity, ObjectMapAdapter<E, T> adapter) {
-        return adapter.fetch(entity);
-    }
-
-    /**
-     * Sets the value of a field in an object using reflection.
-     *
-     * @param <E>        the type of the entity
-     * @param <T>        the type of the field value
-     * @param entity     the object in which to set the field value
-     * @param adapter    the adapter to execute the setter
-     * @param fieldValue the value to be set
-     */
-    public static <E, T> void setFieldValue(E entity,
-                                            ObjectMapAdapter<E, T> adapter,
-                                            Object fieldValue) {
-        adapter.setValue(entity, fieldValue);
-    }
-
-    /**
-     * Casts the specified value to the required type with Optional.
-     *
-     * @param value        the value to be cast
-     * @param requiredType the type to which the value should be cast
-     * @param <T>          the type to which the value should be cast
-     * @return the cast value, or {@code null} if the value is not an instance of the requiredType
-     */
-    public static <T> T cast(Object value, Class<T> requiredType) {
-        return Optional.ofNullable(requiredType)
-                .filter((clazz) -> clazz.isInstance(value))
-                .map((clazz) -> clazz.cast(value))
-                .orElse(null);
-    }
-
     private MapUtil() {
     }
 }

devkit-utils/src/main/java/com/onixbyte/devkit/utils/ObjectMapAdapter.java

@@ -17,53 +17,32 @@
 
 package com.onixbyte.devkit.utils;
 
-import java.util.function.BiConsumer;
-import java.util.function.Function;
+import java.util.Map;
 
 /**
  * Adapts an Object to a Map, making conversion between Map and Object much more safe.
  *
- * @param <E> entity type
  * @param <T> field type
  * @author zihluwang
- * @version 1.4.2
+ * @version 1.7.0
  * @since 1.4.2
  */
-public class ObjectMapAdapter<E, T> {
-
-    private final Function<E, T> getter;
-
-    private final BiConsumer<E, Object> setter;
-
-    /**
-     * Create an adapter.
-     *
-     * @param getter the getter of the field
-     * @param setter the setter of the field
-     */
-    public ObjectMapAdapter(Function<E, T> getter, BiConsumer<E, Object> setter) {
-        this.getter = getter;
-        this.setter = setter;
-    }
+public interface ObjectMapAdapter<T> {
 
     /**
-     * Get data from the entity.
+     * Convert an object to a map.
      *
-     * @param entity the source of the data
-     * @return the data
+     * @param element the element that will be converted to Map
+     * @return a Map that is converted from the element
      */
-    public T fetch(E entity) {
-        return getter.apply(entity);
-    }
+    Map<String, Object> toMap(T element);
 
     /**
-     * Set value to the entity.
+     * Convert a Map to an object.
      *
-     * @param entity the target of the data
-     * @param value  the value
+     * @param map the map that will be converted to Object
+     * @return the object that is converted from the Map
      */
-    public void setValue(E entity, Object value) {
-        setter.accept(entity, value);
-    }
+    T toObject(Map<String, Object> map);
 
 }