客户端交互需要做到
- 提示用户输入什么
- 接收用户输入
- 验证输入合法
实现
MyReader: 负责与用户的交互MyRegularExpression: 负责检验用户输入
MyReader
readInt - 读取一个满足一定条件的整数
- 效果
>> useage:
0. show this usage table
1. set the duty start and end date
2. load duty table from file
3. exit
>> option: s
invalid input
>> option: #
invalid input
>> option: -1
not a valid option id
>> option: 4
not a valid option id
>> option: 1
Please input the [start date] and [end date] in form [yyyy-MM-dd]
start date:
- 实现
/**
* @method readInt
* @param1 mark if this int value represent an option id
* @param2 the min option id, only valid when param1 is true
* @param3 the max option id, only valid when param1 is true
* @param4 the name of the value to be read, aim to show for user
* */
public int readInt(boolean readOpt, int firstOpt, int lastOpt, String name) {
int opt = -1;
while(opt == -1) {
print(name + ": ");
if(!scanner.hasNextInt()) {
// if not receive an integer
print("invalid input\n");
scanner.next();
continue;
}
opt = scanner.nextInt();
if(!readOpt) {
break;
}
if(opt < firstOpt || opt > lastOpt) {
print("not a valid option id\n");
opt = -1;
}
}
return opt;
}
readString - 读取一个通过特定正则验证的字符串
- 效果
>> Please input the [start date] and [end date] in form [yyyy-MM-dd]
start date: s
start date: 1
start date: #
start date: 21-7-7
start date: 2021.7.7
start date: 2021-12-32
start date: 2021-7-7
start date: 2021-07-07
end date:
- 实现
/**
* @method readString
* @param1 the name of the string to be read, also the name for a regular expression
* @param2 the message show for user
* @return an string that match the regular expression
* */
public String readString(String name, String show) {
String string;
do {
string = "";
print(show + " " + name + ": ");
while(string.isEmpty()) {
string = scanner.nextLine();
}
} while(!myRegularExpression.checkAttr(string, name));
return string;
}
MyRegularExpression
addRule - 向正则集中添加一个正则表达式
- 实现
/**
* @method addRule
* @param1 the name of this rule
* @param2 a correct regular expression
* */
public void addRule(String ruleName, String ruleExpression) {
rule.put(ruleName, ruleExpression);
}
checkAttr - 检验一个字符串是否和指定的正则匹配
- 实现
/**
* @method checkAttr
* @param1 the string to be check
* @param2 the name of an regular expression registered in the rule
* */
public boolean checkAttr(String attrString, String attrName) {
Pattern pattern = Pattern.compile(rule.get(attrName));
Matcher matcher = pattern.matcher(attrString);
return matcher.matches();
}
客户端使用流程
1、实例化 MyReader 对象
2、实例化 MyRegularExpression 对象，并添加需要接收的数据的正则表达式
3、为 MyReader 设置 MyRegularExpression
4、调用 MyReader 的读写接口，并传入相应参数
设计模式 - 委托
回顾开头提到的两个主要问题
- 接收用户输入 :
App委托给MyReader - 验证用户输入 :
Myreader委托给MyRegularExpression
附 - 本实验用到的正则表达式
/* note : clear the indent of the file before use */
public static final String extractEmployeePart =
"Employee\\{[\\s]?([A-Za-z]+\\{[A-Za-z]+(\\s[A-Za-z]+)*,[0-9]{3}-[0-9]{4}-[0-9]{4}\\})+\\}";
public static final String extractEmployeeInfo =
"[A-Za-z]+\\{[A-Za-z]+(\\s[A-Za-z]+)*,[0-9]{3}-[0-9]{4}-[0-9]{4}\\}";
public static final String extractEmployeeName =
"[A-Za-z]+\\{";
public static final String extractEmployeeDuty =
"\\{[A-Za-z]+(\\s[A-Za-z]+)*,";
public static final String extractEmployeePhone =
",[0-9]{3}-[0-9]{4}-[0-9]{4}";
public static final String extractPeriodPart =
"Period\\{[\\s]?[0-9]{4}-[0-9]{2}-[0-9]{2},[0-9]{4}-[0-9]{2}-[0-9]{2}\\}";
public static final String extractPeriodInfo =
"\\{[0-9]{4}-[0-9]{2}-[0-9]{2},[0-9]{4}-[0-9]{2}-[0-9]{2}\\}";
public static final String extractStartDate =
"\\{[0-9]{4}-[0-9]{2}-[0-9]{2}";
public static final String extractEndDate =
",[0-9]{4}-[0-9]{2}-[0-9]{2}";
public static final String extractRosterPart =
"Roster\\{[\\s]?([A-Za-z]+\\{[0-9]{4}-[0-9]{2}-[0-9]{2},[0-9]{4}-[0-9]{2}-[0-9]{2}\\})+\\}";
public static final String extractRosterInfo =
"[A-Za-z]+\\{[0-9]{4}-[0-9]{2}-[0-9]{2},[0-9]{4}-[0-9]{2}-[0-9]{2}\\}";
/* use to check the input */
public static final String DATE =
"(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)(([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})-(((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)-(0[1-9]|[12][0-9]|30))|(02-(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))-02-29)";
public static final String NAME =
"[A-Za-z]+";
public static final String DUTY =
"[A-Za-z]+(\\s[A-Za-z]+)*";
public static final String PHONE =
"[0-9]{3}-[0-9]{4}-[0-9]{4}";
public static final String FILE =
"[\\s\\S]*";
public static final String ID =
"[0-9]+";
public static final String CLASSROOM =
"[A-Z]-[0-9]{3}";
public static final String HOURSOFWEEK =
"([1-9][02468]$)|([2468])";
public static final String EXECUTETIME =
"[1-9][0-9]*";