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design_pattern:builder_pattern [2017/10/28 09:21] – ledyxdesign_pattern:builder_pattern [2021/02/07 03:25] (current) – [Builder Pattern] ledyx
Line 3: Line 3:
   * 복잡한 구조를 한 번에 완성시키기 어려움. 그렇기 때문에 각 부분을 만들고 단계적으로 조립.   * 복잡한 구조를 한 번에 완성시키기 어려움. 그렇기 때문에 각 부분을 만들고 단계적으로 조립.
  
-{{tag>Architecture Modeling DesignPattern Creational}}+{{tag>Architecture Modeling Design_Pattern Creational}}
  
 += Director =
 +<sxh java ; highlight : [9,10,11,12,13]>
 +/* Builder 역할의 인터페이스(API)를 사용해서 인스턴스 조립/생성. */
 +public class Director {
 + private Builder builder;
 +
 + public Director(Builder builder) {
 + this.builder = builder;
 + }
 +
 + public void construct() {
 + builder.setHeader();
 + builder.setMessage("Hello", "World!", "안녕?", "세상아");
 + builder.setFooter();
 + }
 +}
 +</sxh>
 +
 +
 += Builder, ConcreteBuilder =
 +
 +<sxh java ; title: Builder>
 +/* 인스턴스의 각 부분을 만들기 위한 메소드 준비 */
 +public abstract class Builder {
 + protected StringBuffer buffer = new StringBuffer();
 +
 + public abstract void setHeader();
 + public abstract void setMessage(String... items);
 + public abstract void setFooter();
 +}
 +</sxh>
 +
 +<sxh java ; title: ConcreteBuilder>
 +public class PlainTextBuilder extends Builder {
 +
 + @Override
 + public void setHeader() {
 + buffer.append("====================\n");
 + }
 +
 + @Override
 + public void setMessage(String... items) {
 +
 + Stream.of(items).forEach(str -> {
 + buffer.append(str);
 + buffer.append("\n");
 + });
 +
 + }
 +
 + public void print() {
 + System.out.println(buffer);
 + System.out.println("\n");
 + }
 +
 + @Override
 + public void setFooter() {
 + buffer.append("====================");
 + }
 +}
 +</sxh>
 +
 +<sxh java ; title: ConcreteBuilder>
 +public class JavaCodeBuilder extends Builder {
 +
 + private String snippet1 = "public class JavaCodeBuilder {\r\n" + 
 + " public static void main(String[] args) {\r\n" + 
 + " System.out.println(";
 +
 + private String snippet2 = ");\r\n" + 
 + " }\r\n" + 
 + "}";
 +
 + @Override
 + public void setHeader() {
 + buffer.append(snippet1);
 + }
 +
 + @Override
 + public void setMessage(String... items) {
 +
 + buffer.append("\"");
 + Stream.of(items).forEach(str -> {
 + buffer.append(str);
 + buffer.append(" ");
 + });
 + buffer.append("\"");
 + }
 +
 + @Override
 + public void setFooter() {
 + buffer.append(snippet2);
 + }
 +
 + public void save() {
 + String fileName = "JavaCodeBuilder.java";
 +
 + System.out.println(buffer);
 + System.out.println();
 + System.out.println(fileName + " 로 저장되었습니다.");
 +
 + try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(fileName))){
 + bos.write(String.valueOf(buffer).getBytes());
 + } catch (Exception e) {
 + e.printStackTrace();
 + }
 + }
 +}
 +</sxh>
 +
 += Client =
 +<sxh java>
 +public class Main {
 + public static void main(String[] args) {
 + PlainTextBuilder plainTextBuilder = new PlainTextBuilder();
 + construct(plainTextBuilder);
 + plainTextBuilder.print();
 +
 + JavaCodeBuilder javaCodeBuilder = new JavaCodeBuilder();
 + construct(javaCodeBuilder);
 + javaCodeBuilder.save();
 + }
 +
 + private static void construct(Builder concreteBuilder) {
 + Director plainTextDirector = new Director(concreteBuilder);
 + plainTextDirector.construct();
 + }
 +}
 +
 +
 +/*
 +====================
 +Hello
 +World!
 +안녕?
 +세상아
 +====================
 +
 +
 +public class JavaCodeBuilder {
 + public static void main(String[] args) {
 + System.out.println("Hello World! 안녕? 세상아 ");
 + }
 +}
 +
 +JavaCodeBuilder.java 로 저장되었습니다.
 +*/
 +</sxh>
design_pattern/builder_pattern.1509178914.txt.gz · Last modified: 2021/02/07 03:15 (external edit)