#region License
/*
* Copyright 2002-2005 the original author or authors.
*
* 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.
*/
#endregion
#region Imports
using System;
using System.Text.RegularExpressions;
using Spring.Expressions;
using Spring.Util;
#endregion
namespace Spring.Validation.Validators{
/// <summary>
/// Validates that the object is valid ISBN-10 or ISBN-13 value.
/// </summary>
/// <author>Goran Milosavljevic</author>
public class ISBNValidator : BaseSimpleValidator
{
#region Constructors
/// <summary>
/// Creates a new instance of the <b>ISBNValidator</b> class.
/// </summary>
public ISBNValidator()
{}
/// <summary>
/// Creates a new instance of the <b>ISBNValidator</b> class.
/// </summary>
/// <param name="test">The expression to validate.</param>
/// <param name="when">The expression that determines if this validator should be evaluated.</param>
public ISBNValidator(string test, string when)
: base(test, when)
{
AssertUtils.ArgumentHasText(test, "test");
}
/// <summary>
/// Creates a new instance of the <b>ISBNValidator</b> class.
/// </summary>
/// <param name="test">The expression to validate.</param>
/// <param name="when">The expression that determines if this validator should be evaluated.</param>
public ISBNValidator(IExpression test, IExpression when)
: base(test, when)
{
AssertUtils.ArgumentNotNull(test, "test");
}
#endregion
#region BaseValidator methods
/// <summary>
/// Validates the supplied <paramref name="objectToValidate"/>.
/// </summary>
/// <remarks>
/// In the case of the <see cref="ISBNValidator"/> class,
/// the test should be a string variable that will be evaluated and the object
/// obtained as a result of this evaluation will be tested using the ISBN-10 or
/// ISBN-13 validation rules.
/// </remarks>
/// <param name="objectToValidate">The object to validate.</param>
/// <returns>
/// <see lang="true"/> if the supplied <paramref name="objectToValidate"/> is valid ISBN.
/// </returns>
protected override bool Validate(object objectToValidate)
{
String isbn = objectToValidate as String;
if (StringUtils.IsNullOrEmpty(isbn))
{
return true;
}
return IsValid(isbn);
}
#endregion
#region ISBNValidator methods
/// <summary>
/// Validates <paramref name="isbn"/> against ISBN-10 or ISBN-13 validation
/// rules.
/// </summary>
/// <param name="isbn">
/// ISBN string to validate.
/// </param>
/// <returns>
/// <b>true</b> if <paramref name="isbn"/> is a valid ISBN-10 or ISBN-13 code.
/// </returns>
private bool IsValid(String isbn)
{
String code = (isbn == null ? null : isbn.Trim().Replace("-", "").Replace(" ", ""));
// check the length
if ((code == null) || (code.Length < 10 || code.Length>13))
{
return false;
}
// validate/reformat using regular expression
Match match;
String pattern;
if (code.Length == 10)
{
pattern = ISBN10_PATTERN;
}
else
{
pattern = ISBN13_PATTERN;
}
match = Regex.Match(code, pattern);
return match.Success && match.Index == 0 && match.Length == code.Length;
}
#endregion
#region Data members
private static readonly String SEP = "(?:\\-|\\s)";
private static readonly String GROUP = "(\\d{1,5})";
private static readonly String PUBLISHER = "(\\d{1,7})";
private static readonly String TITLE = "(\\d{1,6})";
/// <summary>
/// ISBN-10 consists of 4 groups of numbers separated by either
/// dashes (-) or spaces.
/// </summary>
/// <remarks>
/// The first group is 1-5 characters, second 1-7, third 1-6,
/// and fourth is 1 digit or an X.
/// </remarks>
static readonly String ISBN10_PATTERN = "^(?:(\\d{9}[0-9X])|(?:" + GROUP + SEP + PUBLISHER + SEP + TITLE + SEP + "([0-9X])))$";
/// <summary>
/// ISBN-13 consists of 5 groups of numbers separated by either
/// dashes (-) or spaces.
/// </summary>
/// <remarks>
/// The first group is 978 or 979, the second group is
/// 1-5 characters, third 1-7, fourth 1-6, and fifth is 1 digit.
/// </remarks>
static readonly String ISBN13_PATTERN = "^(978|979)(?:(\\d{10})|(?:" + SEP + GROUP + SEP + PUBLISHER + SEP + TITLE + SEP + "([0-9])))$";
#endregion
}
}
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