1 /*
2 * Hibernate Validator, declare and validate application constraints
3 *
4 * License: Apache License, Version 2.0
5 * See the license.txt file in the root directory or <http://www.apache.org/licenses/LICENSE-2.0>.
6 */
7 package org.hibernate.validator.internal.constraintvalidators.bv;
8
9 import javax.validation.ConstraintValidator;
10 import javax.validation.ConstraintValidatorContext;
11 import javax.validation.constraints.NotBlank;
12
13 /**
14 * Check that a character sequence is not {@code null} nor empty after removing any leading or trailing whitespace.
15 *
16 * @author Guillaume Smet
17 */
18 public class NotBlankValidator implements ConstraintValidator<NotBlank, CharSequence> {
19
20 /**
21 * Checks that the character sequence is not {@code null} nor empty after removing any leading or trailing
22 * whitespace.
23 *
24 * @param charSequence the character sequence to validate
25 * @param constraintValidatorContext context in which the constraint is evaluated
26 * @return returns {@code true} if the string is not {@code null} and the length of the trimmed
27 * {@code charSequence} is strictly superior to 0, {@code false} otherwise
28 */
29 @Override
30 public boolean isValid(CharSequence charSequence, ConstraintValidatorContext constraintValidatorContext) {
31 if ( charSequence == null ) {
32 return false;
33 }
34
35 return charSequence.toString().trim().length() > 0;
36 }
37 }
38