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A Java SDK to help implementing the Open Banking standard : https://www.openbanking.org.uk/read-write-apis/

There is a newer version: 3.1.2.5

/**
 *
 * The contents of this file are subject to the terms of the Common Development and
 *  Distribution License (the License). You may not use this file except in compliance with the
 *  License.
 *
 *  You can obtain a copy of the License at https://forgerock.org/cddlv1-0/. See the License for the
 *  specific language governing permission and limitations under the License.
 *
 *  When distributing Covered Software, include this CDDL Header Notice in each file and include
 *  the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 *  Header, with the fields enclosed by brackets [] replaced by your own identifying
 *  information: "Portions copyright [year] [name of copyright owner]".
 *
 *  Copyright 2019 ForgeRock AS.
 */
package uk.org.openbanking.validation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.Currency;

public class CurrencyCodeValidator implements ConstraintValidator {
    @Override
    public void initialize(ValidISOCurrencyCode validISOCurrencyCode) {
    }

    @Override
    public boolean isValid(String currencyCode, ConstraintValidatorContext constraintValidatorContext) {
        if (currencyCode == null) {
            return false;
        }
        try {
            Currency.getInstance(currencyCode);
        } catch(IllegalArgumentException e) {
            return false;
        }
        return true;
    }

}