xapi.util.validators.ChecksValidEmail Maven / Gradle / Ivy
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package xapi.util.validators;
import xapi.util.api.ValidatesValue;
public class ChecksValidEmail implements ValidatesValue {
public static final ChecksValidEmail SINGLETON = new ChecksValidEmail();
@Override
public String validate(String value, String errorPrefix) {
if (value == null)
return "[value cannot be null] "+errorPrefix;
if (value.length() == 0)
return "[value cannot be empty] "+errorPrefix;
int ind = value.indexOf('@');
errorPrefix = "You sent: "+value;
if (ind == -1)
return "[value must contain @] +"+errorPrefix;
if (ind == 0)
return "[value cannot start with @] "+errorPrefix;
if (!value.substring(0, ind).matches("[a-z0-9._-]+")) {
return "[username can only contain letter, numbers and . _ or - ] "+errorPrefix;
}
value = value.substring(ind + 1);
if (!value.matches("[a-z0-9.-]+")) {
return "[domain name can only contain letter, numbers and . or - ] "+errorPrefix;
}
if (value.indexOf('.')==-1) {
return "[domain name must contain a . ] "+errorPrefix;
}
return null;
}
}