Boost speed in circumstance, which updates a few property or creates with a part of dictionary. #197

Author: wolfcon

MJExtension/MJEClass.h

@@ -18,6 +18,9 @@ NS_ASSUME_NONNULL_BEGIN
     NSArray<MJProperty *> * _Nullable _allCodingProperties;
 
     NSArray<MJProperty *> * _Nullable _allProperties2JSON;
+    NSDictionary <NSString *, MJProperty *> *_mapper;
+    NSArray<MJProperty *> *_multiKeysProperties;
+
 
     BOOL _hasOld2NewModifier;
     BOOL _hasDictionary2ObjectModifier;

MJExtension/MJEClass.m

@@ -189,6 +189,9 @@ - (void)mj_handlePropertiesWithAllowedList:(NSSet *)allowedList
     NSMutableArray<MJProperty *> *allProperties = NSMutableArray.array;
     NSMutableArray<MJProperty *> *codingProperties = NSMutableArray.array;
     NSMutableArray<MJProperty *> *allProperties2JSON = NSMutableArray.array;
+    NSMutableDictionary *mapper = NSMutableDictionary.dictionary;
+    NSMutableArray<MJProperty *> *multiKeysProperties = NSMutableArray.array;
+
     [cls mj_enumerateClasses:^(__unsafe_unretained Class c, BOOL *stop) {
         // 1. get all property list
         unsigned int outCount = 0;
@@ -252,6 +255,14 @@ - (void)mj_handlePropertiesWithAllowedList:(NSSet *)allowedList
 
                 // handle keypath / keypath array / keypath array(with subkey)
                 [property handleOriginKey:key];
+                
+                // The property matched with a singular key is the only condition for dictionary enumeration.
+                if (property->_isMultiMapping) {
+                    [multiKeysProperties addObject:property];
+                } else {
+                    property->_nextSame = mapper[property->_mappedKey] ?: nil;
+                    mapper[property->_mappedKey] = property;
+                }
             }
 
             [allProperties addObject:property];
@@ -264,7 +275,9 @@ - (void)mj_handlePropertiesWithAllowedList:(NSSet *)allowedList
     _allProperties = allProperties.copy;
     _allCodingProperties = codingProperties.copy;
     _allProperties2JSON = allProperties2JSON.copy;
-    
+    _mapper = mapper.copy;
+    _multiKeysProperties = multiKeysProperties.copy;
+
     _propertiesCount = _allProperties.count;
 }
 

MJExtension/MJProperty.h

@@ -95,6 +95,8 @@ NS_ASSUME_NONNULL_BEGIN
     MJEBasicType _basicObjectType;
     /// True if property is a number (e.g: bool, double, int, etc.).
     BOOL _isBasicNumber;
+    /// The property has the same value with it. It's a linked list data structure for different property linked by the same key, which will result to get the same value.
+    MJProperty * _Nullable _nextSame;
 }
 
 /// `Property` name that defined by class.