Prototype Pattern

@Test public void test() { Manager manager = new Manager(); UnderlinePen upen = new UnderlinePen('~'); MessageBox mbox = new MessageBox('*'); MessageBox sbox = new MessageBox('/'); manager.register("strong box", upen); manager.register("warning box", mbox); manager.register("slash box", sbox); Product p1 = manager.create("strong box"); p1.use("Hello, world."); Product p2 = manager.create("warning box"); p2.use("Hello, world."); Product p3 = manager.create("slash box"); p3.use("Hello, world."); }


객체를 등록하고, 필요시 등록된 객체를 넘겨주는 것이 아니고 복사해서 복사본을 넘겨준다.
package com.tistory.temp.pattern.prototype; import java.util.HashMap; public class Manager { private HashMap<String, Product> showcase = new HashMap<String, Product>(); public void register(String name, Product proto) { showcase.put(name, proto); } public Product create(String protoname) { Product p = (Product) showcase.get(protoname); return p.createClone(); } }

package com.tistory.temp.pattern.prototype; public interface Product extends Cloneable { public void use(String s); public Product createClone(); }

package com.tistory.temp.pattern.prototype; public class UnderlinePen implements Product { private char ulchar; public UnderlinePen(char ulchar) { this.ulchar = ulchar; } public void use(String s) { int length = s.getBytes().length; System.out.println("\"" + s + "\""); System.out.print(" "); for (int i = 0; i < length; i++) { System.out.print(ulchar); } System.out.println(" "); } public Product createClone() { Product p = null; try { p = (Product) clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); } return p; } }

package com.tistory.temp.pattern.prototype; public class MessageBox implements Product { private char decochar; public MessageBox(char decochar) { this.decochar = decochar; } public void use(String s) { int length = s.getBytes().length; for (int i = 0; i < length + 4; i++) { System.out.print(decochar); } System.out.println(""); System.out.println(decochar + " " + s + " " + decochar); for (int i = 0; i < length + 4; i++) { System.out.print(decochar); } System.out.println(""); } public Product createClone() { Product p = null; try { p = (Product) clone(); } catch (Exception e) { e.printStackTrace(); } return p; } }