content: package act.validation;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import act.Act;
  import act.util.TopLevelDomainList;
  import org.osgl.util.S;
  
  import javax.validation.ConstraintValidator;
  import javax.validation.ConstraintValidatorContext;
  
  public class EmailHandler implements ConstraintValidator<Email, CharSequence> {
  
      private TopLevelDomainList tldList;
  
      @Override
      public void initialize(Email email) {
          tldList = Act.getInstance(TopLevelDomainList.class);
      }
  
      @Override
      public boolean isValid(CharSequence charSequence, ConstraintValidatorContext constraintValidatorContext) {
          return isValid(charSequence);
      }
  
      private boolean isValid(Object val) {
          String s = S.string(val);
          boolean valid = (S.isBlank(s) || s.toLowerCase().matches("^[_a-z0-9-']+(\\.[_a-z0-9-']+)*(\\+[0-9]+)?@[a-z0-9-]+(\\.[a-z0-9-]+)*(\\.[a-z]{2,64})$"));
          if (!valid) {
              return false;
          }
          // check tld
          String tld = S.cut(s).afterLast(".");
          return tldList.isTld(tld);
      }
  }
  