/**
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.webui.form.validator;
import org.exoplatform.commons.serialization.api.annotations.Serialized;
import org.exoplatform.web.application.CompoundApplicationMessage;
import org.exoplatform.webui.form.UIFormInput;
/**
* Created by The eXo Platform SARL Author : Dang Van Minh minhdv81@yahoo.com Jun 7, 2006
*
* Validates whether an email is in the correct format Valid characters that can be used in a domain name are: a-z 0-9 - (dash)
* or . (dot) but not as a starting or ending character . (dot) as a separator for the textual portions of a domain name
*
* Valid characters that can be used in a local part are: a-z 0-9 - (dash) or _ (underscore) or . (dot) but not as a starting or
* ending character and not appear two or more times consecutively
*/
@Serialized
public class EmailAddressValidator extends MultipleConditionsValidator {
static void validate(String value, String label, CompoundApplicationMessage messages) {
Object[] args = { label };
int atIndex = value.indexOf('@');
if (atIndex == -1) {
messages.addMessage("EmailAddressValidator.msg.Invalid-input", args);
} else {
String localPart = value.substring(0, atIndex);
String domainName = value.substring(atIndex + 1);
if (!validateLocalPart(localPart.toCharArray()) || !validateDomainName(domainName.toCharArray())) {
messages.addMessage("EmailAddressValidator.msg.Invalid-input", args);
}
}
}
@Override
protected void validate(String value, String label, CompoundApplicationMessage messages, UIFormInput uiInput) {
validate(value, label, messages);
}
private static boolean validateLocalPart(char[] localPart) {
if (localPart.length == 0 || !Character.isLetter(localPart[0])
|| !Character.isLetterOrDigit(localPart[localPart.length - 1])) {
return false;
}
for (int i = 1; i < localPart.length - 1; i++) {
char c = localPart[i];
char next = localPart[i + 1];
if (Character.isLetterOrDigit(c) || (isLocalPartSymbol(c) && Character.isLetterOrDigit(next))) {
continue;
} else {
return false;
}
}
return true;
}
private static boolean validateDomainName(char[] domainName) {
if (domainName.length == 0 || !Character.isLetterOrDigit(domainName[0])
|| !Character.isLetterOrDigit(domainName[domainName.length - 1])) {
return false;
}
// Check if there is no non-alphabet following the last dot
boolean foundValidLastDot = false;
for (int i = 1; i < domainName.length - 1; i++) {
char c = domainName[i];
char next = domainName[i + 1];
if (c == '.') {
foundValidLastDot = true;
} else if (!Character.isLetter(c)) {
foundValidLastDot = false;
}
if (Character.isLetterOrDigit(c) || (isDomainNameSymbol(c) && Character.isLetterOrDigit(next))) {
continue;
} else {
return false;
}
}
return foundValidLastDot;
}
private static boolean isLocalPartSymbol(char c) {
return c == '-' || c == '_' || c == '.';
}
private static boolean isDomainNameSymbol(char c) {
return c == '-' || c == '.';
}
}