/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package Web;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 检查path,分配调用的handler
 *
 * @author Ma
 */
public class Allocation {

 /**
 * 路径配置
 */
 public static HashMap PATH = new HashMap();

 /**
 * 初始化,分配器
 *
 * @param request 请求header
 */
 public static void init(Request request) {


 //说明访问的非静态文件
 String[] pathArray = HttpServer.getAllPath();
 for (int i = 0; i < pathArray.length; i++) {
 Pattern pattern = Pattern.compile(pathArray[i]);

 Matcher matcher = pattern.matcher(request.Path);

 if (matcher.matches()) {
 try {
 Class handler = Allocation.PATH.get(pathArray[i]).getClass();
 //处理参数
 Class[] paramType = new Class[matcher.groupCount()];
 Arrays.fill(paramType, String.class);
 Method method = handler.getMethod(request.Method.toLowerCase(), paramType);
 //把request赋值过去 使用
 handler.getMethod("init", new Class[]{Request.class}).invoke(Allocation.PATH.get(pathArray[i]), request);
 //调用类似构造方法;
 handler.getMethod("construct").invoke(Allocation.PATH.get(pathArray[i]));
 String[] param = new String[matcher.groupCount()];
 for (int j = 0; j < param.length; j++) {
 param[j] = matcher.group(j + 1);

 }
 method.invoke(Allocation.PATH.get(pathArray[i]), param);

 } catch (NoSuchMethodException ex) {
 //Handler中方法不存在
 ExceptionalHandling.set404(ex);
 Logger.getLogger(Allocation.class.getName()).log(Level.SEVERE, null, ex);
 } catch (SecurityException ex) {
 //安全异常。由安全管理器抛出,用于指示违反安全情况的异常。
 Logger.getLogger(Allocation.class.getName()).log(Level.SEVERE, null, ex);
 } catch (IllegalAccessException ex) {
 //设置成了私有方法,应该为public
 InternalServerError500.set500(ex);
 Logger.getLogger(Allocation.class.getName()).log(Level.SEVERE, null, ex);
 } catch (IllegalArgumentException ex) {
 //调用方法的时候传递的参数不正确
 InternalServerError500.set500(ex);
 Logger.getLogger(Allocation.class.getName()).log(Level.SEVERE, null, ex);
 } catch (InvocationTargetException ex) {
 //ex.getCause() 才能获取真实的异常
 //一般是构造方法的错误。所以Handler中的构造方法不能有参数
 Logger.getLogger(Allocation.class.getName()).log(Level.SEVERE, null, ex.getCause());
 } catch (Exception ex) {
 //这里处理其他异常,因为是用反射运行的这里要处理异常
 Logger.getLogger(Allocation.class.getName()).log(Level.SEVERE, null, ex);
 }
 //如果有就直接Return,终止往下执行,下面处理没找到。
 return;
 } else {

 continue;
 }
 }

 //执行到这里,说明没有找到匹配的URL发送404错误

 NotFound404.set404("未设置对应URL:" + request.Path);

 }

}