1bP8deFn

1import org.apache.commons.lang.StringUtils;
2import java.util.HashMap;
3import java.util.Map;
4
5public class App {
6    public static void main(String[] args) {
7
8        //all these prints out as expected.
9
10        String newEmail1 = getEmail("sample1");
11        System.out.println("Expected: some**@gmail.com | actual: " + newEmail1);
12
13        String newEmail2 = getEmail("sample2");
14        System.out.println("Expected: null | actual: " + newEmail2);
15
16        String newEmail3 = getEmail("short");
17        System.out.println("Expected: q**@gmail.com | actual: " + newEmail3);
18
19        String newEmail4 = getEmail("noname");
20        System.out.println("Expected: null | actual: " + newEmail4);
21    }
22
23    private static String getEmail(String param){
24        //added these solely for testing to show
25        Map<String, String> emails = new HashMap<>();
26        emails.put("sample1", "someone@gmail.com");
27        emails.put("short", "qw@gmail.com");
28        emails.put("noname", "@gmail.com");
29        //added these solely for testing to show
30
31        //I am looking for opinions from here onwards. <-- HERE -->
32        String emailAddress = emails.get(param);
33        if(emailAddress != null){
34            String emailAddressFront = StringUtils.substringBefore(emailAddress, "@");
35            String emailAddressBack = StringUtils.substringAfter(emailAddress, "@");
36
37            // i need to hide emails by only revealing first 4 characters.
38            // but also need to check in case email name is shorter than 4.
39            if(emailAddressFront.isEmpty()){
40                return null;
41            }
42            int shortenedLength = 4;
43            int emailNameLength = emailAddressFront.length();
44            if(emailNameLength < 4){
45                shortenedLength = emailNameLength - 1;
46            }
47            emailAddress = emailAddressFront.substring(0, shortenedLength) + "**@" + emailAddressBack;
48        }
49        return emailAddress;
50        //I am looking for opinions till here. <-- HERE -->
51    }
52}
53	
54private static String getEmail(final String param){
55    final Map<String, String> emails = new HashMap<>();
56    emails.put("sample1", "someone@gmail.com");
57    emails.put("short", "qw@gmail.com");
58    emails.put("noname", "@gmail.com");
59
60    final String emailAddress = emails.get(param);
61    if (emailAddress == null) {
62        return null;
63    }
64
65    final int atIndex = emailAddress.indexOf('@');
66    if (atIndex == 0) {
67        return null;
68    }
69
70    final StringBuilder maskedEmailAddress = new StringBuilder(emailAddress);
71    if (atIndex < 4) {
72        maskedEmailAddress.replace(1, atIndex, "**");
73    } else {
74        maskedEmailAddress.replace(4, atIndex, "**");
75    }
76
77    return maskedEmailAddress.toString();
78}