RangeValidator.java

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package org.glassfish.grizzly.config.dom;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * ConstraintValidator for validating the Range within min to max or ${...} or null.
 *
 * @author Shing Wai Chan
 */
public class RangeValidator implements ConstraintValidator<Range, String> {
    private int min;
    private int max;

    public void initialize(final Range range) {
        min = range.min();
        max = range.max();
    }

    public boolean isValid(final String s, final ConstraintValidatorContext constraintValidatorContext) {
        if (s == null) {
            return true;
        }

        try {
            int value = Integer.parseInt(s);
            return (value >= min && value <= max);
        } catch (NumberFormatException e) {
            return s.charAt(0) == '$'
                    && s.charAt(1) == '{' && s.charAt(s.length() - 1) == '}';
        }
    }
}