SimpleStringValidator.java

  1. /*
  2.  * Copyright 2022 Global Crop Diversity Trust
  3.  *
  4.  * Licensed under the Apache License, Version 2.0 (the "License");
  5.  * you may not use this file except in compliance with the License.
  6.  * You may obtain a copy of the License at
  7.  *
  8.  *   http://www.apache.org/licenses/LICENSE-2.0
  9.  *
  10.  * Unless required by applicable law or agreed to in writing, software
  11.  * distributed under the License is distributed on an "AS IS" BASIS,
  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13.  * See the License for the specific language governing permissions and
  14.  * limitations under the License.
  15.  */
  16. package org.gringlobal.custom.validation.javax;

  17. import javax.validation.ConstraintValidator;
  18. import javax.validation.ConstraintValidatorContext;

  19. /**
  20.  * @author Matija Obreza
  21.  */
  22. public class SimpleStringValidator implements ConstraintValidator<SimpleString, String> {

  23.     /**
  24.      * Initializes the validator.
  25.      */
  26.     @Override
  27.     public void initialize(SimpleString constraintAnnotation) {
  28.     }

  29.     /**
  30.      * Implements the validation logic.
  31.      * @return {@code false} if {@code value} contains line break characters, tab, double white space or is not trimmed
  32.      */
  33.     @Override
  34.     public boolean isValid(String value, ConstraintValidatorContext context) {
  35.         if (value == null) {
  36.             return true;
  37.         }
  38.         return value.trim().equals(value) && value.indexOf('\n') == -1 && value.indexOf('\r') == -1 && value.indexOf("  ") == -1 && !value.matches("\\s\\s");
  39.     }

  40. }