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CommonCommandPattern.java
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CommonCommandPattern.java
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package com.camnter.basicexercises.design.command;
import java.util.ArrayList;
import java.util.List;
/**
* 命令模式
*
* 命令模式 (Command Pattern):将一个请求封装为一个对象,从而让我们可用不同的请求对客户进行参数化;对请求排队或者
* 记录请求日志,以及支持可撤销的操作。命令模式是一种对象行为型模式,其别名为动作 (Action) 模式或
* 事务 (Transaction) 模式
*
* @author CaMnter
*/
public class CommonCommandPattern {
public static void main(String[] args) {
FunctionMenu functionMenu = new FunctionMenu();
FunctionButton help = new FunctionButton("帮助");
help.setCommand(new HelpCommand());
FunctionButton minimize = new FunctionButton("最小化");
minimize.setCommand(new MinimizeCommand());
functionMenu.addFunctionButton(help);
functionMenu.addFunctionButton(minimize);
functionMenu.execute();
}
/**
* 抽象命令类
*/
public static abstract class Command {
public abstract void execute();
}
/**
* 具体命令类 - 帮助
*/
public static class HelpCommand extends Command {
private final HelpHandler helpHandler;
public HelpCommand() {
this.helpHandler = new HelpHandler();
}
@Override
public void execute() {
this.helpHandler.help();
}
private static class HelpHandler {
public void help() {
System.out.println("[HelpHandler] [help]");
}
}
}
/**
* 具体命令类 - 窗口最小化
*/
public static class MinimizeCommand extends Command {
private final WindowHandler windowHandler;
public MinimizeCommand() {
this.windowHandler = new WindowHandler();
}
@Override
public void execute() {
this.windowHandler.minimize();
}
public static class WindowHandler {
public void minimize() {
System.out.println("[WindowHandler] [minimize]");
}
}
}
/**
* 功能按钮
*/
public static class FunctionButton {
private final String name;
private Command command;
public FunctionButton(String name) {
this.name = name;
}
public void setCommand(Command command) {
this.command = command;
}
public void onClick() {
System.out.println("[FunctionButton] [name] = " + this.name);
this.command.execute();
}
}
/**
* 功能菜单
*/
public static class FunctionMenu {
private List<FunctionButton> functionButtons = new ArrayList<FunctionButton>();
public void addFunctionButton(FunctionButton functionButton) {
this.functionButtons.add(functionButton);
}
public void removeFunctionButton(FunctionButton functionButton) {
this.functionButtons.remove(functionButton);
}
public void execute() {
for (FunctionButton functionButton : functionButtons) {
functionButton.onClick();
}
}
}
}