org.hibernate.validator.internal.constraintvalidators.SizeValidatorForCharSequence Maven / Gradle / Ivy

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*
* 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
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package org.hibernate.validator.internal.constraintvalidators;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.constraints.Size;

import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;

/**
 * Check that the length of a character sequence is between min and max.
 *
 * @author Emmanuel Bernard
 * @author Gavin King
 * @author Hardy Ferentschik
 */
public class SizeValidatorForCharSequence implements ConstraintValidator {
	
	private static final Log log = LoggerFactory.make();
	
	private int min;
	private int max;

	public void initialize(Size parameters) {
		min = parameters.min();
		max = parameters.max();
		validateParameters();
	}

	/**
	 * Checks the length of the specified character sequence (e.g. string).
	 *
	 * @param charSequence The character sequence to validate.
	 * @param constraintValidatorContext context in which the constraint is evaluated.
	 *
	 * @return Returns true if the string is null or the length of charSequence between the specified
	 *         min and max values (inclusive), false otherwise.
	 */
	public boolean isValid(CharSequence charSequence, ConstraintValidatorContext constraintValidatorContext) {
		if ( charSequence == null ) {
			return true;
		}
		int length = charSequence.length();
		return length >= min && length <= max;
	}

	private void validateParameters() {
		if ( min < 0 ) {
			throw log.getMinCannotBeNegativeException();
		}
		if ( max < 0 ) {
			throw log.getMaxCannotBeNegativeException();
		}
		if ( max < min ) {
			throw log.getLengthCannotBeNegativeException();
		}
	}
}