add RATreeView as source

doric-iOS/Devkit/Classes/RATreeView/RABatchChangeEntity.m

@@ -0,0 +1,62 @@
+//
+//  RABatchChangesEntity.m
+//  RATreeView
+//
+//  Created by Rafal Augustyniak on 17/11/15.
+//  Copyright © 2015 Rafal Augustyniak. All rights reserved.
+//
+
+
+#import "RABatchChangeEntity.h"
+
+
+@implementation RABatchChangeEntity
+
++ (instancetype)batchChangeEntityWithBlock:(void (^)())updates type:(RABatchChangeType)type ranking:(NSInteger)ranking
+{
+    NSParameterAssert(updates);
+    RABatchChangeEntity *entity = [RABatchChangeEntity new];
+    entity.type = type;
+    entity.ranking = ranking;
+    entity.updatesBlock = updates;
+
+    return entity;
+}
+
+- (NSComparisonResult)compare:(RABatchChangeEntity *)otherEntity
+{
+    if ([self destructiveOperation]) {
+        if (![otherEntity destructiveOperation]) {
+            return NSOrderedAscending;
+        } else {
+            return [@(otherEntity.ranking) compare:@(self.ranking)];
+        }
+    } else if (self.type == RABatchChangeTypeItemMove && otherEntity.type != RABatchChangeTypeItemMove) {
+        return [otherEntity destructiveOperation] ? NSOrderedAscending : NSOrderedDescending;
+
+    } else if ([self constructiveOperation]) {
+        if (![otherEntity constructiveOperation]) {
+            return NSOrderedDescending;
+        } else {
+            return [@(self.ranking) compare:@(otherEntity.ranking)];
+        }
+
+    } else {
+        return NSOrderedSame;
+    }
+}
+
+- (BOOL)constructiveOperation
+{
+    return self.type == RABatchChangeTypeItemRowExpansion
+    || self.type == RABatchChangeTypeItemRowInsertion;
+}
+
+- (BOOL)destructiveOperation
+{
+    return self.type == RABatchChangeTypeItemRowCollapse
+    || self.type == RABatchChangeTypeItemRowDeletion;
+}
+
+@end
+