org.apache.commons.validator.routines.ISSNValidator Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.validator.routines;
import java.io.Serializable;
import org.apache.commons.validator.routines.checkdigit.CheckDigitException;
import org.apache.commons.validator.routines.checkdigit.EAN13CheckDigit;
import org.apache.commons.validator.routines.checkdigit.ISSNCheckDigit;
/**
* International Standard Serial Number (ISSN)
* is an eight-digit serial number used to
* uniquely identify a serial publication.
*
*
* The format is:
*
* ISSN dddd-dddC
* where:
* d = decimal digit (0-9)
* C = checksum (0-9 or X)
*
* The checksum is formed by adding the first 7 digits multiplied by
* the position in the entire number (counting from the right).
*
* For example, abcd-efg would be 8a + 7b + 6c + 5d + 4e +3f +2g.
* The check digit is modulus 11, where the value 10 is represented by 'X'
* For example:
* ISSN 0317-8471
* ISSN 1050-124X
*
* This class strips off the 'ISSN ' prefix if it is present before passing
* the remainder to the checksum routine.
*
*
*
* Note: the {@link #isValid(String)} and {@link } methods strip off any leading
* or trailing spaces before doing the validation.
* To ensure that only a valid code (without 'ISSN ' prefix) is passed to a method,
* use the following code:
*
* Object valid = validator.validate(input);
* if (valid != null) {
* some_method(valid.toString());
* }
*
* @since 1.5.0
*/
public class ISSNValidator implements Serializable {
private static final long serialVersionUID = 4319515687976420405L;
private static final String ISSN_REGEX = "(?:ISSN )?(\\d{4})-(\\d{3}[0-9X])$"; // We don't include the '-' in the code, so it is 8 chars
private static final CodeValidator issnValidator = new CodeValidator(ISSN_REGEX, 8, ISSNCheckDigit.ISSN_CHECK_DIGIT);
/** ISSN Code Validator */
private static final ISSNValidator ISSN_VALIDATOR = new ISSNValidator();
/**
* Return a singleton instance of the ISSN validator
*
* @return A singleton instance of the ISSN validator.
*/
public static ISSNValidator getInstance() {
return ISSN_VALIDATOR;
}
/**
* Check the code is a valid ISSN code after any transformation
* by the validate routine.
* @param code The code to validate.
* @return true
if a valid ISSN
* code, otherwise false
.
*/
public boolean isValid(String code) {
return issnValidator.isValid(code);
}
/**
* Check the code is valid ISSN code.
*
* If valid, this method returns the ISSN code with
* the 'ISSN ' prefix removed (if it was present)
*
* @param code The code to validate.
* @return A valid ISSN code if valid, otherwise null
.
*/
public Object validate(String code) {
return issnValidator.validate(code);
}
/**
* Convert an ISSN code to an EAN-13 code.
*
* This method requires a valid ISSN code.
* It may contain a leading 'ISSN ' prefix,
* as the input is passed through the {@link #validate(String)}
* method.
*
* @param issn The ISSN code to convert
* @param suffix the two digit suffix, e.g. "00"
* @return A converted EAN-13 code or null
* if the input ISSN code is not valid
*/
public String convertToEAN13(String issn, String suffix) {
if (suffix == null || !suffix.matches("\\d\\d")) {
throw new IllegalArgumentException("Suffix must be two digits: '" + suffix + "'");
}
Object result = validate(issn);
if (result == null) {
return null;
}
// Calculate the new EAN-13 code
final String input = result.toString();
String ean13 = "977" + input.substring(0, input.length() -1) + suffix;
try {
String checkDigit = EAN13CheckDigit.EAN13_CHECK_DIGIT.calculate(ean13);
ean13 += checkDigit;
return ean13;
} catch (CheckDigitException e) { // Should not happen
throw new IllegalArgumentException("Check digit error for '" + ean13 + "' - " + e.getMessage());
}
}
}