This toolset, which just make some easy function depend on other famous and great project, is just designed for myself.
ArgUtil is designed for make java program can decode the arguments automatically.
感谢apache.cli提供的参数解析，我不过是在他的基础上套了一个壳罢了。
注意：我使用Arg注释作为判断变量是否需要从传入参数中解析
notion: I use the annotation(Arg) to order which field want to be decode from argv.
参数列表：
arg(必须)：传入参数的短格式
longarg(非必须)：传入参数的长格式
needed(默认为false)：是否必须
val(非必须)：默认值
level(若needed为false时才会生效)：比needed更加灵活，能够根据level判断该参数是够是必须的
description(非必须)：参数说明
hasArg(必须)：后面是否携带值
parameter of annotation Arg:
arg: min name of argument
longarg: long name of argument
needed: whether have to be input to program
val: default value(after all argument is contribute by string, so it won't be something complex. In this toolset only support int double float String boolean)
level: sometimes needed is not enough just because program have different function, and in different function need different arguments. Therefore I design level to specify whether in this function the argument is needed. (every bit of int means one level)
If the decode find some exception it will output the parameter description which is made up automatically by toolset. If it is not enough, user can just input a new Options which OverWrited the toString function when create new instance of ArgUtils.
import cn.treeh.ToNX.O;
import cn.treeh.ToNX.util.ArgUtil;
public class MyParameter extends ArgUtil {
@Arg(arg = "a", needed = true, hasArg = true, val = "1")//default value = 1
public int par_1;//-a
@Arg(arg = "b", hasArg = true, level = 1)//level = 1
public int par_2;//-b
@Arg(arg = "c", longarg = "cc", hasArg = false, description = "this is par_3")//also longarg is support
public double par_3;//-c | --cc
static public void main(String[] argv) {
MyParameter mp = new MyParameter();
O.ptln(mp.toHelpString());//print autogenerate help
mp.parse(argv, 1);//1 means fields which level=1 are needed
O.ptln(mp.toString()); //print total parameters list
O.ptln(mp.par_2);
}
}recommend: Use a static field to restore arguments, so that arguments can be accessible in every part of program.