impement Result by myself.

Author: nori0620

SwiftFilePath.xcodeproj/project.pbxproj

@@ -14,6 +14,7 @@
 		CC7833131A610299005E77C3 /* Entity.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC7833101A610299005E77C3 /* Entity.swift */; };
 		CC7833141A610299005E77C3 /* File.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC7833111A610299005E77C3 /* File.swift */; };
 		CC78331C1A618186005E77C3 /* Either.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC78331A1A61816B005E77C3 /* Either.swift */; };
+		CC78331E1A6186B7005E77C3 /* Result.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC78331D1A6186B7005E77C3 /* Result.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -37,6 +38,7 @@
 		CC7833101A610299005E77C3 /* Entity.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Entity.swift; sourceTree = "<group>"; };
 		CC7833111A610299005E77C3 /* File.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = File.swift; sourceTree = "<group>"; };
 		CC78331A1A61816B005E77C3 /* Either.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Either.swift; sourceTree = "<group>"; };
+		CC78331D1A6186B7005E77C3 /* Result.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Result.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -85,6 +87,7 @@
 				CC7833111A610299005E77C3 /* File.swift */,
 				CC7832F11A610124005E77C3 /* SwiftFilePath.h */,
 				CC7832EF1A610124005E77C3 /* Supporting Files */,
+				CC78331D1A6186B7005E77C3 /* Result.swift */,
 			);
 			path = SwiftFilePath;
 			sourceTree = "<group>";
@@ -238,6 +241,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				CC78331C1A618186005E77C3 /* Either.swift in Sources */,
+				CC78331E1A6186B7005E77C3 /* Result.swift in Sources */,
 				CC7833141A610299005E77C3 /* File.swift in Sources */,
 				CC7833121A610299005E77C3 /* Dir.swift in Sources */,
 				CC7833131A610299005E77C3 /* Entity.swift in Sources */,

SwiftFilePath/Result.swift

@@ -0,0 +1,82 @@
+//
+//  Result.swift
+//  SwiftFilePath
+//
+//  Created by nori0620 on 2015/01/11.
+//  Copyright (c) 2015年 Norihiro Sakamoto. All rights reserved.
+//
+
+public enum Result<S,F> {
+    
+    case Success(ResultContainer<S>)
+    case Failure(ResultContainer<F>)
+    
+    public init(success:S){
+        self = .Success( ResultContainer(success) )
+    }
+    
+    public init(failure:F){
+        self = .Failure( ResultContainer(failure) )
+    }
+    
+    public var isSuccess:Bool {
+        switch self {
+            case .Success: return true
+            case .Failure: return false
+        }
+        
+    }
+    
+    public var isFailure:Bool {
+        switch self {
+            case .Success: return false
+            case .Failure: return true
+        }
+    }
+    
+    public var value:S? {
+        switch self {
+        case .Success(let container):
+            return container.content
+        case .Failure(let container):
+            return .None
+        }
+    }
+    
+    public var error:F? {
+        switch self {
+        case .Success(let container):
+            return .None
+        case .Failure(let container):
+            return container.content
+        }
+    }
+    
+    public func onFailure(handler:(F) -> Void ) -> Result<S,F> {
+        switch self {
+        case .Success(let container):
+            return self
+        case .Failure(let container):
+            handler( container.content )
+            return self
+        }
+    }
+    
+    public func onSuccess(handler:(S) -> Void ) -> Result<S,F> {
+        switch self {
+        case .Success(let container):
+            handler( container.content )
+            return self
+        case .Failure(let container):
+            return self
+        }
+    }
+   
+}
+
+public class ResultContainer<T> {
+    let content:T
+    init(_ content:T){
+        self.content = content
+    }
+}

SwiftFilePathTests/SwiftFilePathTests.swift

@@ -392,7 +392,44 @@ class SwiftFilePathTests: XCTestCase {
         XCTAssertFalse( srcFile.exists )
         XCTAssertTrue( destFile.exists )
 
+    }
+    
+    // MARK:
+    
+    func testSuccessResult() {
+        var callOnFailure = false
+        var callOnSuccess = false
+        let result = Result<Int,String>(success:200)
+            .onSuccess({ (value:Int) in
+                callOnSuccess = true
+                XCTAssertEqual(value,200)
+            })
+            .onFailure({ (error:String) in
+                callOnFailure = true
+            })
 
-        
+        XCTAssertTrue( result.isSuccess )
+        XCTAssertEqual( result.value!, 200 )
+        XCTAssertFalse( callOnFailure )
+        XCTAssertTrue( callOnSuccess )
+    }
+    
+    func testFailureResult() {
+        var callOnFailure = false
+        var callOnSuccess = false
+        let result = Result<Int,String>(failure:"NG!")
+            .onSuccess({ (value:Int) in
+                callOnSuccess = true
+            })
+            .onFailure({ (error:String) in
+                callOnFailure = true
+                XCTAssertEqual(error,"NG!")
+            })
+        
+        XCTAssertTrue( result.isFailure )
+        XCTAssertEqual( result.error!, "NG!" )
+        XCTAssertTrue( callOnFailure )
+        XCTAssertFalse( callOnSuccess )
     }
+    
 }