io.jsonwebtoken.impl.lang.PositiveIntegerConverter Maven / Gradle / Ivy
/*
* Copyright © 2022 jsonwebtoken.io
*
* 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.
*/
package io.jsonwebtoken.impl.lang;
import io.jsonwebtoken.lang.Assert;
import java.util.concurrent.atomic.AtomicInteger;
public class PositiveIntegerConverter implements Converter {
public static final PositiveIntegerConverter INSTANCE = new PositiveIntegerConverter();
@Override
public Object applyTo(Integer integer) {
return integer;
}
@Override
public Integer applyFrom(Object o) {
Assert.notNull(o, "Argument cannot be null.");
int i;
if (o instanceof Byte || o instanceof Short || o instanceof Integer || o instanceof AtomicInteger) {
i = ((Number) o).intValue();
} else { // could be Long, AtomicLong, Float, Decimal, BigInteger, BigDecimal, String, etc., all of which
// may not be accurately converted into an Integer, either due to overflow or fractional values. The
// easiest way to account for all of them is to parse the string value as an int instead of testing all
// the types:
String sval = String.valueOf(o);
try {
i = Integer.parseInt(sval);
} catch (NumberFormatException e) {
String msg = "Value cannot be represented as a java.lang.Integer.";
throw new IllegalArgumentException(msg, e);
}
}
if (i <= 0) {
String msg = "Value must be a positive integer.";
throw new IllegalArgumentException(msg);
}
return i;
}
}