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Remove unchecked behaviour in MathUtils.cast

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-use dynamic casting to ensure typesafety
-shortcircuit if the Number already has the desired type
This commit is contained in:
Ruben Dijkstra 2014-09-18 09:30:31 +02:00
parent e84c71fb82
commit a7897ca8c3
1 changed files with 15 additions and 20 deletions
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35
querydsl-core/src/main/java/com/mysema/util/MathUtils.java
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@ -38,38 +38,33 @@ public final class MathUtils {
return MathUtils.<D>cast(res, (Class<D>)num1.getClass());
}
@SuppressWarnings("unchecked")
public static <D extends Number> D cast(Number num, Class<D> type) {
Number rv;
if (type.equals(Byte.class)) {
rv = num.byteValue();
D rv;
if (type.isInstance(num)) {
rv = type.cast(num);
} else if (type.equals(Byte.class)) {
rv = type.cast(num.byteValue());
} else if (type.equals(Double.class)) {
rv = num.doubleValue();
rv = type.cast(num.doubleValue());
} else if (type.equals(Float.class)) {
rv = num.floatValue();
rv = type.cast(num.floatValue());
} else if (type.equals(Integer.class)) {
rv = num.intValue();
rv = type.cast(num.intValue());
} else if (type.equals(Long.class)) {
rv = num.longValue();
rv = type.cast(num.longValue());
} else if (type.equals(Short.class)) {
rv = num.shortValue();
rv = type.cast(num.shortValue());
} else if (type.equals(BigDecimal.class)) {
if (num instanceof BigDecimal) {
rv = num;
} else {
rv = new BigDecimal(num.toString());
}
rv = type.cast(new BigDecimal(num.toString()));
} else if (type.equals(BigInteger.class)) {
if (num instanceof BigInteger) {
rv = num;
} else if (num instanceof BigDecimal) {
rv = ((BigDecimal)num).toBigInteger();
if (num instanceof BigDecimal) {
rv = type.cast(((BigDecimal) num).toBigInteger());
} else {
rv = new BigInteger(num.toString());
rv = type.cast(new BigInteger(num.toString()));
}
} else {
throw new IllegalArgumentException(String.format("Illegal type : %s", type.getSimpleName()));
}
return (D) rv;
return rv;
}
}