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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.validation;

import static java.util.Objects.isNull;

import lombok.extern.slf4j.Slf4j;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.nio.file.Path;

/**
 * Validates that a string value is a valid path, exists, and is a regular file (not a directory).
 */
@Slf4j
public class FilePathValidator implements ConstraintValidator {

    private FilePath filePath;

    @Override
    public void initialize(FilePath constraintAnnotation) {
        this.filePath = constraintAnnotation;
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        if (isNull(value)) {
            return filePath.allowNull();
        }

        try {
            var file = Path.of(value).toFile();
            return file.exists() && file.isFile();
        } catch (Exception e) {
            LOG.warn("Exception thrown validating path [{}]", value, e);
            return false;
        }
    }
}