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Builder Pattern
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| protocol Builder { | |
| func make(title: String) | |
| func make(string: String) | |
| func make(items: [String]) | |
| func close() | |
| } |
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| final class BuilderTests: XCTestCase { | |
| func testTextBuilder() throws { | |
| let textBuilder = TextBuilder() | |
| let director = Director(builder: textBuilder) | |
| director.construct() | |
| let result = textBuilder.result() | |
| XCTAssertEqual( | |
| result, | |
| """ | |
| ========================== | |
| 『Gretting』 | |
| ◼ 아침과 낮에 | |
| · 좋은 아침입니다. | |
| · 안녕하세요. | |
| ◼ 밤에 | |
| · 안녕하세요 | |
| · 안녕히 주무세요. | |
| · 안녕히 계세요. | |
| ========================== | |
| """ | |
| ) | |
| } | |
| func testHTMLBuilder() throws { | |
| let htmlBuilder = HTMLBuilder() | |
| let director = Director(builder: htmlBuilder) | |
| director.construct() | |
| XCTAssertEqual(htmlBuilder.filename(), "Gretting.html") | |
| XCTAssertEqual( | |
| htmlBuilder.result(), | |
| """ | |
| <html><head><title>Gretting</title></head><body> | |
| <h1>Gretting</h1> | |
| <p>아침과 낮에</p> | |
| <ul> | |
| <li>좋은 아침입니다.</li> | |
| <li>안녕하세요.</li> | |
| </ul> | |
| <p>밤에</p> | |
| <ul> | |
| <li>안녕하세요</li> | |
| <li>안녕히 주무세요.</li> | |
| <li>안녕히 계세요.</li> | |
| </ul> | |
| </body></html> | |
| """ | |
| ) | |
| } | |
| } |
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| final class Director { | |
| private let builder: Builder | |
| init(builder: Builder) { | |
| self.builder = builder | |
| } | |
| func construct() { | |
| builder.make(title: "Gretting") | |
| builder.make(string: "아침과 낮에") | |
| builder.make(items: [ | |
| "좋은 아침입니다.", | |
| "안녕하세요." | |
| ]) | |
| builder.make(string: "밤에") | |
| builder.make(items: [ | |
| "안녕하세요", | |
| "안녕히 주무세요.", | |
| "안녕히 계세요." | |
| ]) | |
| builder.close() | |
| } | |
| } |
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| final class HTMLBuilder: Builder { | |
| private var writer: PrintWriter? | |
| func make(title: String) { | |
| writer = PrintWriter(filename: title + ".html") | |
| writer?.println("<html><head><title>" + title + "</title></head><body>") | |
| writer?.println("<h1>" + title + "</h1>") | |
| } | |
| func make(string: String) { | |
| writer?.println("<p>" + string + "</p>") | |
| } | |
| func make(items: [String]) { | |
| writer?.println("<ul>") | |
| items.forEach { | |
| writer?.println("<li>\($0)</li>") | |
| } | |
| writer?.println("</ul>") | |
| } | |
| func close() { | |
| writer?.println("</body></html>") | |
| do { | |
| try writer?.close() | |
| } catch { | |
| print("[PrintWriter] error: \(error)") | |
| } | |
| } | |
| func filename() -> String? { | |
| return writer?.filename | |
| } | |
| func result() -> String? { | |
| return writer?.result() | |
| } | |
| } |
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| final class PrintWriter { | |
| enum Exception: Error { | |
| case fileWriteException(Error) | |
| case invalidfileURL | |
| } | |
| fileprivate let filename: String | |
| private let fileURL: URL | |
| private var contents: String | |
| init?(filename: String) { | |
| guard let fileURL = FileManager | |
| .default | |
| .urls(for: .documentDirectory, in: .userDomainMask) | |
| .first? | |
| .appendingPathComponent(filename) else { | |
| return nil | |
| } | |
| self.filename = filename | |
| self.fileURL = fileURL | |
| self.contents = "" | |
| } | |
| func println(_ text: String) { | |
| contents.append(text + "\n") | |
| } | |
| func close() throws { | |
| try contents.write(to: fileURL, atomically: true, encoding: .utf8) | |
| } | |
| func result() -> String { | |
| return contents | |
| } | |
| } |
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| final class TextBuilder: Builder { | |
| private var buffer: String = "" | |
| func make(title: String) { | |
| buffer.append("==========================\n") | |
| buffer.append("『\(title)』") | |
| buffer.append("\n") | |
| } | |
| func make(string: String) { | |
| buffer.append("◼ \(string)\n") | |
| buffer.append("\n") | |
| } | |
| func make(items: [String]) { | |
| buffer.append(contentsOf: items.flatMap { " · \($0)\n" }) | |
| buffer.append("\n") | |
| } | |
| func close() { | |
| buffer.append("==========================\n") | |
| } | |
| func result() -> String { | |
| return buffer | |
| } | |
| } |
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