/**
 * @author : sunys
 * @version : v1.0
 * @createTime : 2021/1/16 20:08
 * @description : 抽象领导处理者
 */
public abstract class LeaderHandler {
    private LeaderHandler nextLeader;
    protected String name;

    public LeaderHandler(String name) {
        this.name = name;
    }

    public LeaderHandler getNextLeader() {
        return nextLeader;
    }

    public void setNextLeader(LeaderHandler nextLeader) {
        this.nextLeader = nextLeader;
    }

    /**
     * 抽象审批处理方法
     *
     * @param days 请假天数
     */
    public abstract void approval(Integer days);
}

/**
 * @author : sunys
 * @version : v1.0
 * @createTime : 2021/1/16 20:18
 * @description : 主任具体处理者
 */
public class DirectorHandler extends LeaderHandler {
    public DirectorHandler(String name) {
        super(name);
    }

    @Override
    public void approval(Integer days) {
        System.out.println("--->请假" + days + "天，由" + this.name + "审批通过--->");
        LeaderHandler nextLeader = super.getNextLeader();
        if (null != nextLeader) {
            nextLeader.approval(days);
        }
    }
}

/**
 * @author : sunys
 * @version : v1.0
 * @createTime : 2021/1/16 20:29
 * @description : 部门经理具体处理者
 */
public class DepartmentManagerHandler extends LeaderHandler {
    public DepartmentManagerHandler(String name) {
        super(name);
    }

    @Override
    public void approval(Integer days) {
        System.out.println("--->请假" + days + "天，由" + this.name + "审批通过--->");
        LeaderHandler nextLeader = super.getNextLeader();
        if (null != nextLeader) {
            nextLeader.approval(days);
        }
    }
}

/**
 * @author : sunys
 * @version : v1.0
 * @createTime : 2021/1/16 20:30
 * @description : 人力资源部经理具体处理者
 */
public class ResourcesManagerHandler extends LeaderHandler {
    public ResourcesManagerHandler(String name) {
        super(name);
    }

    @Override
    public void approval(Integer days) {
        if (days > 3) {
            System.out.println("--->请假" + days + "天，超过3天，由" + this.name + "审批通过--->");
        }
        LeaderHandler nextLeader = super.getNextLeader();
        if (null != nextLeader) {
            nextLeader.approval(days);
        }
    }
}

/**
 * @author : sunys
 * @version : v1.0
 * @createTime : 2021/1/16 20:39
 * @description :
 */
public class CompetentLeaderHandler extends LeaderHandler {
    public CompetentLeaderHandler(String name) {
        super(name);
    }

    @Override
    public void approval(Integer days) {
        if (days > 3) {
            System.out.println("--->请假" + days + "天，超过3天，由" + this.name + "审批通过--->");
        }
        LeaderHandler nextLeader = super.getNextLeader();
        if (null != nextLeader) {
            nextLeader.approval(days);
        }
    }
}

/**
 * @author : sunys
 * @version : v1.0
 * @createTime : 2021/1/16 20:05
 * @description :
 */
public class Client {

    public static void approvalTest(Integer days) {
        //组装责任链
        DirectorHandler directorHandler = new DirectorHandler("部门侯主任");
        DepartmentManagerHandler departmentManagerHandler = new DepartmentManagerHandler("部门吴经理");
        ResourcesManagerHandler resourcesManagerHandler = new ResourcesManagerHandler("人力资源王经理");
        CompetentLeaderHandler competentLeaderHandler = new CompetentLeaderHandler("主管领导老王");

        directorHandler.setNextLeader(departmentManagerHandler);
        departmentManagerHandler.setNextLeader(resourcesManagerHandler);
        resourcesManagerHandler.setNextLeader(competentLeaderHandler);
        //提交请求
        directorHandler.approval(days);
        System.out.println("流程审批结束");
    }
}

/**
 * The type Client test.
 */
class ClientTest {

    /**
     * Client test.
     */
    @Test
    void clientTest() {
        System.out.println("Client call director");
        System.out.println("====================================");
        //请假小于3天
        Client.approvalTest(2);
        System.out.println("====================================");
        //请假大于3天
        Client.approvalTest(5);
        System.out.println("====================================");
    }
}

public interface FilterChain {
    void doFilter(ServletRequest var1, ServletResponse var2) throws IOException, ServletException;
}

public final class ApplicationFilterChain implements FilterChain {
    ...//源码省略

    public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {
        if (Globals.IS_SECURITY_ENABLED) {
            ServletRequest req = request;
            ServletResponse res = response;

            try {
                AccessController.doPrivileged(() -> {
                    this.internalDoFilter(req, res);
                    return null;
                });
            } catch (PrivilegedActionException var7) {
                Exception e = var7.getException();
                if (e instanceof ServletException) {
                    throw (ServletException)e;
                }

                if (e instanceof IOException) {
                    throw (IOException)e;
                }

                if (e instanceof RuntimeException) {
                    throw (RuntimeException)e;
                }

                throw new ServletException(e.getMessage(), e);
            }
        } else {
            this.internalDoFilter(request, response);
        }

    }
    ...//源码省略
}

public interface HandlerInterceptor {
    boolean preHandle(HttpServletRequest var1, HttpServletResponse var2, Object var3) throws Exception;

    void postHandle(HttpServletRequest var1, HttpServletResponse var2, Object var3, ModelAndView var4) throws Exception;

    void afterCompletion(HttpServletRequest var1, HttpServletResponse var2, Object var3, Exception var4) throws Exception;
}

public class LocaleChangeInterceptor extends HandlerInterceptorAdapter {
    ...//源码省略

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException {
        String newLocale = request.getParameter(this.getParamName());
        if (newLocale != null && this.checkHttpMethod(request.getMethod())) {
            LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
            if (localeResolver == null) {
                throw new IllegalStateException("No LocaleResolver found: not in a DispatcherServlet request?");
            }

            try {
                localeResolver.setLocale(request, response, this.parseLocaleValue(newLocale));
            } catch (IllegalArgumentException var7) {
                if (!this.isIgnoreInvalidLocale()) {
                    throw var7;
                }

                this.logger.debug("Ignoring invalid locale value [" + newLocale + "]: " + var7.getMessage());
            }
        }

        return true;
    }

    ...//源码省略
}

/**
 * 手机品牌接口
 *
 * @author sunys
 */
public interface PhoneBrand {
    /**
     * Call.
     * 打电话
     */
    void call();

    /**
     * Send message.
     * 发短信
     */
    void sendMessage();

    /**
     * Go online.
     * 上网
     */
    void goOnline();
}

/**
 * @author sunys
 * HuaWei品牌接口实现
 */
public class HuaWeiPhoneBrandImpl implements PhoneBrand {
    @Override
    public void call() {
        System.out.println("Call use HuaWei phone.");
    }

    @Override
    public void sendMessage() {
        System.out.println("SendMessage use HuaWei phone.");
    }

    @Override
    public void goOnline() {
        System.out.println("GoOnline use HuaWei phone.");
    }
}

/**
 * @author sunys
 * Apple品牌接口实现
 */
public class ApplePhoneBrandImpl implements PhoneBrand {
    @Override
    public void call() {
        System.out.println("Call use Apple phone.");
    }

    @Override
    public void sendMessage() {
        System.out.println("SendMessage use Apple phone.");
    }

    @Override
    public void goOnline() {
        System.out.println("GoOnline use Apple phone.");
    }
}

/**
 * @author sunys
 * XiaoMi品牌接口实现
 */
public class XiaoMiPhoneBrandImpl implements PhoneBrand {
    @Override
    public void call() {
        System.out.println("Call use XiaoMi phone.");
    }

    @Override
    public void sendMessage() {
        System.out.println("SendMessage use XiaoMi phone.");
    }

    @Override
    public void goOnline() {
        System.out.println("GoOnline use XiaoMi phone.");
    }
}

/**
 * @author sunys
 * 手机抽象类 相当于“桥”
 */
public abstract class Phone {

    /**
     * PhoneBrand 类聚合
     */
    private PhoneBrand phoneBrand;

    public Phone(PhoneBrand phoneBrand) {
        super();
        this.phoneBrand = phoneBrand;
    }

    protected void call() {
        this.phoneBrand.call();
    }


    protected void sendMessage() {
        this.phoneBrand.sendMessage();
    }

    protected void goOnline() {
        this.phoneBrand.goOnline();
    }
}

/**
 * The type Phone black.
 * @author sunys
 */
public class PhoneBlack extends Phone{
    /**
     * Instantiates a new Phone black.
     *
     * @param phoneBrand the phone brand
     */
    public PhoneBlack(PhoneBrand phoneBrand) {
        super(phoneBrand);
    }

    @Override
    public void call() {
        super.call();
        System.out.println("The phone of call is Black.");
    }

    @Override
    public void sendMessage() {
        super.sendMessage();
        System.out.println("The phone of sendMessage is Black.");
    }

    @Override
    public void goOnline() {
        super.goOnline();
        System.out.println("The phone of goOnline is Black.");
    }
}

/**
 * The type Phone red.
 *
 * @author sunys
 */
public class PhoneRed extends Phone{
    /**
     * Instantiates a new Phone red.
     *
     * @param phoneBrand the phone brand
     */
    public PhoneRed(PhoneBrand phoneBrand) {
        super(phoneBrand);
    }

    @Override
    public void call() {
        super.call();
        System.out.println("The phone of call is Red.");
    }

    @Override
    public void sendMessage() {
        super.sendMessage();
        System.out.println("The phone of sendMessage is Red.");
    }

    @Override
    public void goOnline() {
        super.goOnline();
        System.out.println("The phone of goOnline is Red.");
    }
}

/**
 * The type Phone white.
 *
 * @author sunys
 */
public class PhoneWhite extends Phone{
    /**
     * Instantiates a new Phone white.
     *
     * @param phoneBrand the phone brand
     */
    public PhoneWhite(PhoneBrand phoneBrand) {
        super(phoneBrand);
    }

    @Override
    public void call() {
        super.call();
        System.out.println("The phone of call is White.");
    }

    @Override
    public void sendMessage() {
        super.sendMessage();
        System.out.println("The phone of sendMessage is White.");
    }

    @Override
    public void goOnline() {
        super.goOnline();
        System.out.println("The phone of goOnline is White.");
    }
}

/**
 * The type Client.
 *
 * @author sunys
 */
public class Client {
    /**
     * Bridge test.
     */
    public static void bridgeTest() {
        PhoneRed phoneRed = new PhoneRed(new HuaWeiPhoneBrandImpl());
        phoneRed.call();
        phoneRed.sendMessage();
        phoneRed.goOnline();
        PhoneBlack phoneBlack = new PhoneBlack(new HuaWeiPhoneBrandImpl());
        phoneBlack.call();
        phoneBlack.sendMessage();
        phoneBlack.goOnline();
        PhoneWhite phoneWhite = new PhoneWhite(new XiaoMiPhoneBrandImpl());
        phoneWhite.call();
        phoneWhite.sendMessage();
        phoneWhite.goOnline();
    }
}

/**
 * The type Client.
 *
 * @author sunys
 */
public class Client {

    /**
     * Jdbc test.
     */
    public static void jdbcTest(){
        try {
            // 1. 注册驱动
            Class.forName("com.mysql.jdbc.Driver");
            //2. 创建一个连接对象
            Connection conn = DriverManager.getConnection("url","user","password");
            //3. 创建一个sql语句的发送命令对象
            Statement stmt = conn.createStatement();
            // 4. 执行sql,拿到查询的结果集对象
            ResultSet rs = stmt.executeQuery("s");
            //5. 输出结果集的数据
            while(rs.next()){
                System.out.println(rs);
            }
            //6. 关闭连接，命令对象以及结果集。
            rs.close();
            stmt.close();
            conn.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}

public class Source220V {
    public int outVoltage220v(){
        return 220;
    }
}

public interface Destination5V {
    /**
     *
     * @return
     */
    int outVoltage5v();
}

public class VoltageAdapter extends Source220V implements Destination5V{
    @Override
    public int outVoltage5v() {
        int voltage220v = outVoltage220v();
        return voltage220v/44;
    }
}

public class Client {
    public static void main(String[] args) {
        VoltageAdapter voltageAdapter = new VoltageAdapter();
        voltageAdapter.outVoltage5v();
    }
}

public class VoltageAdapter  implements Destination5V{
    /**
     * 直接持有需要被适配的类（Source）
     */
    private Source220V source220V;

    public VoltageAdapter(Source220V source220V) {
        this.source220V = source220V;
    }

    @Override
    public int outVoltage5v() {
        int voltage220v = source220V.outVoltage220v();
        return voltage220v/44;
    }
}

public class Client {
    public static void main(String[] args) {
        VoltageAdapter voltageAdapter = new VoltageAdapter(new Source220V());
        voltageAdapter.outVoltage5v();
    }
}

public interface Destination {
    /**
     *
     * @return
     */
    int outVoltage5v();

    /**
     * @return
     */
    int outVoltage10v();

    /**
     * @return
     */
    int outVoltage36v();

    /**
     * @return
     */
    int outVoltage220v();
}

public  abstract class AbstractVoltageAdapter implements Destination{
    @Override
    public int outVoltage5v() {
        return 5;
    }

    @Override
    public int outVoltage10v() {
        return 10;
    }

    @Override
    public int outVoltage36v() {
        return 36;
    }

    @Override
    public int outVoltage220v() {
        return 220;
    }
}

public class VoltageAdapter extends AbstractVoltageAdapter{
    @Override
    public int outVoltage5v() {
        int voltage220v = outVoltage220v();
        return voltage220v/44;
    }
}

public class Client {
    public static void main(String[] args) {
        VoltageAdapter voltageAdapter = new VoltageAdapter();
        voltageAdapter.outVoltage5v();
    }
}

public class DispatcherServlet extends FrameworkServlet {
...
    /**
 * Return the HandlerAdapter for this handler object.
 * @param handler the handler object to find an adapter for
 * @throws ServletException if no HandlerAdapter can be found for the handler. This is a fatal error.
 */
protected HandlerAdapter getHandlerAdapter(Object handler) throws ServletException {
for (HandlerAdapter ha : this.handlerAdapters) {
if (logger.isTraceEnabled()) {
logger.trace("Testing handler adapter [" + ha + "]");
}
if (ha.supports(handler)) {
return ha;
}
}
throw new ServletException("No adapter for handler [" + handler +
"]: The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler");
}
...
}

public interface HandlerAdapter {

/**
 * Given a handler instance, return whether or not this {@code HandlerAdapter}
 * can support it. Typical HandlerAdapters will base the decision on the handler
 * type. HandlerAdapters will usually only support one handler type each.
 * <p>A typical implementation:
 * <p>{@code
 * return (handler instanceof MyHandler);
 * }
 * @param handler handler object to check
 * @return whether or not this object can use the given handler
 */
boolean supports(Object handler);

/**
 * Use the given handler to handle this request.
 * The workflow that is required may vary widely.
 * @param request current HTTP request
 * @param response current HTTP response
 * @param handler handler to use. This object must have previously been passed
 * to the {@code supports} method of this interface, which must have
 * returned {@code true}.
 * @throws Exception in case of errors
 * @return ModelAndView object with the name of the view and the required
 * model data, or {@code null} if the request has been handled directly
 */
ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception;

/**
 * Same contract as for HttpServlet's {@code getLastModified} method.
 * Can simply return -1 if there's no support in the handler class.
 * @param request current HTTP request
 * @param handler handler to use
 * @return the lastModified value for the given handler
 * @see javax.servlet.http.HttpServlet#getLastModified
 * @see org.springframework.web.servlet.mvc.LastModified#getLastModified
 */
long getLastModified(HttpServletRequest request, Object handler);

}

public class Car {
    private String engine;
    private String frame;
    private String wheel;

    public String getEngine() {
        return engine;
    }

    public void setEngine(String engine) {
        this.engine = engine;
    }

    public String getFrame() {
        return frame;
    }

    public void setFrame(String frame) {
        this.frame = frame;
    }

    public String getWheel() {
        return wheel;
    }

    public void setWheel(String wheel) {
        this.wheel = wheel;
    }
    @Override
    public String toString() {
        return "Car{" +
                "engine='" + engine + '\'' +
                ", frame='" + frame + '\'' +
                ", wheel='" + wheel + '\'' +
                '}';
    }
}

public interface CarBuilder {
    /**
     * 建造发动机
     * @return
     */
    String buildEngine();

    /**
     * 建造车身框架
     * @return
     */
    String buildFrame();

    /**
     * 建造轮胎
     * @return
     */
    String buildWheel();

    /**
     * 获取小汽车成品
     * @return
     */
    Car getCar();
}

public class BaoMaCarBuilder implements CarBuilder{
    Car car = new Car();
    public void buildEngine() {
        this.car.setEngine("建造宝马发动机！");
    }

    public void buildFrame() {
        this.car.setFrame("建造宝马车身框架！");
    }
    public void buildWheel() {
       this.car.setWheel("建造宝马轮胎！");
    }

    public Car getCar() {
        return this.car;
    }
}

public class CarDirector {
    private CarBuilder carBuilder;

    public CarDirector(CarBuilder carBuilder) {
        this.carBuilder = carBuilder;
    }

    /**
     * 构建汽车的流程交给指导者
     * @return
     */
    public Car builderCar(){
        carBuilder.buildEngine();
        carBuilder.buildFrame();
        carBuilder.buildWheel();
        return carBuilder.getCar();
    }
}

public class Client {
    public static void main(String[] args) {
        BaoMaCarBuilder baoMaCarBuilder = new BaoMaCarBuilder();
        CarDirector carDirector = new CarDirector(baoMaCarBuilder);
        Car car = carDirector.builderCar();
        System.out.println(car);
    }
}

public interface Appendable {

    /**
     * Appends the specified character sequence to this <tt>Appendable</tt>.
     *
     * <p> Depending on which class implements the character sequence
     * <tt>csq</tt>, the entire sequence may not be appended.  For
     * instance, if <tt>csq</tt> is a {@link java.nio.CharBuffer} then
     * the subsequence to append is defined by the buffer's position and limit.
     *
     * @param  csq
     *         The character sequence to append.  If <tt>csq</tt> is
     *         <tt>null</tt>, then the four characters <tt>"null"</tt> are
     *         appended to this Appendable.
     *
     * @return  A reference to this <tt>Appendable</tt>
     *
     * @throws  IOException
     *          If an I/O error occurs
     */
    Appendable append(CharSequence csq) throws IOException;

    /**
     * Appends a subsequence of the specified character sequence to this
     * <tt>Appendable</tt>.
     *
     * <p> An invocation of this method of the form <tt>out.append(csq, start,
     * end)</tt> when <tt>csq</tt> is not <tt>null</tt>, behaves in
     * exactly the same way as the invocation
     *
     * <pre>
     *     out.append(csq.subSequence(start, end)) </pre>
     *
     * @param  csq
     *         The character sequence from which a subsequence will be
     *         appended.  If <tt>csq</tt> is <tt>null</tt>, then characters
     *         will be appended as if <tt>csq</tt> contained the four
     *         characters <tt>"null"</tt>.
     *
     * @param  start
     *         The index of the first character in the subsequence
     *
     * @param  end
     *         The index of the character following the last character in the
     *         subsequence
     *
     * @return  A reference to this <tt>Appendable</tt>
     *
     * @throws  IndexOutOfBoundsException
     *          If <tt>start</tt> or <tt>end</tt> are negative, <tt>start</tt>
     *          is greater than <tt>end</tt>, or <tt>end</tt> is greater than
     *          <tt>csq.length()</tt>
     *
     * @throws  IOException
     *          If an I/O error occurs
     */
    Appendable append(CharSequence csq, int start, int end) throws IOException;

    /**
     * Appends the specified character to this <tt>Appendable</tt>.
     *
     * @param  c
     *         The character to append
     *
     * @return  A reference to this <tt>Appendable</tt>
     *
     * @throws  IOException
     *          If an I/O error occurs
     */
    Appendable append(char c) throws IOException;
}

abstract class AbstractStringBuilder implements Appendable, CharSequence {
...
  // Documentation in subclasses because of synchro difference
    public AbstractStringBuilder append(StringBuffer sb) {
        if (sb == null)
            return appendNull();
        int len = sb.length();
        ensureCapacityInternal(count + len);
        sb.getChars(0, len, value, count);
        count += len;
        return this;
    }

    /**
     * @since 1.8
     */
    AbstractStringBuilder append(AbstractStringBuilder asb) {
        if (asb == null)
            return appendNull();
        int len = asb.length();
        ensureCapacityInternal(count + len);
        asb.getChars(0, len, value, count);
        count += len;
        return this;
    }

    // Documentation in subclasses because of synchro difference
    @Override
    public AbstractStringBuilder append(CharSequence s) {
        if (s == null)
            return appendNull();
        if (s instanceof String)
            return this.append((String)s);
        if (s instanceof AbstractStringBuilder)
            return this.append((AbstractStringBuilder)s);

        return this.append(s, 0, s.length());
    }
...
}

public final class StringBuilder
    extends AbstractStringBuilder
    implements java.io.Serializable, CharSequence
{
...
   @Override
     public StringBuilder append(Object obj) {
         return append(String.valueOf(obj));
     }

     @Override
     public StringBuilder append(String str) {
         super.append(str);
         return this;
     }

     /**
      * Appends the specified {@code StringBuffer} to this sequence.
      * <p>
      * The characters of the {@code StringBuffer} argument are appended,
      * in order, to this sequence, increasing the
      * length of this sequence by the length of the argument.
      * If {@code sb} is {@code null}, then the four characters
      * {@code "null"} are appended to this sequence.
      * <p>
      * Let <i>n</i> be the length of this character sequence just prior to
      * execution of the {@code append} method. Then the character at index
      * <i>k</i> in the new character sequence is equal to the character at
      * index <i>k</i> in the old character sequence, if <i>k</i> is less than
      * <i>n</i>; otherwise, it is equal to the character at index <i>k-n</i>
      * in the argument {@code sb}.
      *
      * @param   sb   the {@code StringBuffer} to append.
      * @return  a reference to this object.
      */
     public StringBuilder append(StringBuffer sb) {
         super.append(sb);
         return this;
     }

     @Override
     public StringBuilder append(CharSequence s) {
         super.append(s);
         return this;
     }
...
}