103 lines
2.5 KiB
Java
103 lines
2.5 KiB
Java
package de.dis2017;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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/**
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* Small helper class for forms.
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*/
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class FormUtil {
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/**
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* Reads a string from the console.
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*
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* @param label Label that is shown before the input
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* @return read string
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*/
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static String readString(String label) {
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return readString(label, "");
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}
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/**
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* Reads a string from the console.
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*
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* @param label Label that is shown before the input
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* @param defaultValue the default value in case an empty input is provided
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* @return read string
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*/
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static String readString(String label, String defaultValue) {
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String ret = null;
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BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
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try {
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System.out.print(label+": ");
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ret = stdin.readLine();
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ret = ret.isEmpty() ? defaultValue : ret;
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} catch (IOException e) {
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e.printStackTrace();
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}
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return ret;
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}
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/**
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* Reads a password from the console.
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*
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* @return the entered password
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*/
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static String readPassword() {
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String password;
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System.out.print("Password: ");
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password = String.valueOf(System.console().readPassword());
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return password;
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}
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/**
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* Reads a password from the console.
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*
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* @return the entered password
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*/
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static String readPassword(String oldPassword) {
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String password;
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System.out.print("Password: ");
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password = String.valueOf(System.console().readPassword());
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if(password.equals(""))return oldPassword;
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return password;
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}
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/**
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* Reads an integer from the console.
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*
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* @param label Label that is shown before the input
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* @return read integer
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*/
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static int readInt(String label) {
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return readInt(label, -1);
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}
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/**
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* Reads an integer from the console.
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*
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* @param label Label that is shown before the input
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* @param defaultValue the default value
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* @return read integer
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*/
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static int readInt(String label, int defaultValue) {
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int ret = 0;
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boolean finished = false;
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String defaultValueStr = defaultValue == -1 ? "" : String.valueOf(defaultValue);
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while(!finished) {
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String line = readString(label, defaultValueStr);
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try {
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ret = Integer.parseInt(line);
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finished = true;
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} catch (NumberFormatException e) {
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System.err.println("Invalid input: Please insert a valid number!");
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}
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}
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return ret;
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}
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}
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