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/*
* Copyright 2000-2022 Vaadin Ltd.
*
* 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.
*/
package com.vaadin.data.validator;
import com.vaadin.data.ValidationResult;
import com.vaadin.data.ValueContext;
/**
* Verifies that the length of a string is within the given range.
*
* @author Vaadin Ltd.
* @since 8.0
*/
@SuppressWarnings("serial")
public class StringLengthValidator extends AbstractValidator<String> {
private final RangeValidator<Integer> validator;
/**
* Creates a new StringLengthValidator with a given error message and
* minimum and maximum length limits.
*
* @param errorMessage
* the error message to return if validation fails
* @param minLength
* the minimum permissible length of the string or null for no
* limit.
* @param maxLength
* the maximum permissible length of the string or null for no
* limit.
*/
public StringLengthValidator(String errorMessage, Integer minLength,
Integer maxLength) {
super(errorMessage);
validator = RangeValidator.of(errorMessage, minLength, maxLength);
}
@Override
public ValidationResult apply(String value, ValueContext context) {
if (value == null) {
return toResult(value, true);
}
ValidationResult lengthCheck = validator.apply(value.length(), context);
return toResult(value, !lengthCheck.isError());
}
/**
* Gets the maximum permissible length of the string.
*
* @return the maximum length of the string or null if there is no limit
*/
public Integer getMaxLength() {
return validator.getMaxValue();
}
/**
* Gets the minimum permissible length of the string.
*
* @return the minimum length of the string or null if there is no limit
*/
public Integer getMinLength() {
return validator.getMinValue();
}
/**
* Sets the maximum permissible length of the string.
*
* @param maxLength
* the maximum length to accept or null for no limit
*/
public void setMaxLength(Integer maxLength) {
validator.setMaxValue(maxLength);
}
/**
* Sets the minimum permissible length.
*
* @param minLength
* the minimum length to accept or null for no limit
*/
public void setMinLength(Integer minLength) {
validator.setMaxValue(minLength);
}
@Override
public String toString() {
return String.format("%s[%d, %d]", getClass().getSimpleName(),
getMinLength(), getMaxLength());
}
}
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