Method coerceToNumber

java/org/apache/el/lang/ELSupport.java:317–359

Coerces a Number to the specified numeric type. @param number the number to coerce @param type the target numeric type @return the coerced number @throws ELException if the number cannot be coerced to the target type

(final Number number, final Class<?> type)

     * @throws ELException if the number cannot be coerced to the target type
     */
    protected static Number coerceToNumber(final Number number, final Class<?> type) throws ELException {
        if (Long.TYPE == type || Long.class.equals(type)) {
            return Long.valueOf(number.longValue());
        }
        if (Double.TYPE == type || Double.class.equals(type)) {
            return Double.valueOf(number.doubleValue());
        }
        if (Integer.TYPE == type || Integer.class.equals(type)) {
            return Integer.valueOf(number.intValue());
        }
        if (BigInteger.class.equals(type)) {
            if (number instanceof BigDecimal) {
                return ((BigDecimal) number).toBigInteger();
            }
            if (number instanceof BigInteger) {
                return number;
            }
            return BigInteger.valueOf(number.longValue());
        }
        if (BigDecimal.class.equals(type)) {
            if (number instanceof BigDecimal) {
                return number;
            }
            if (number instanceof BigInteger) {
                return new BigDecimal((BigInteger) number);
            }
            return new BigDecimal(number.doubleValue());
        }
        if (Byte.TYPE == type || Byte.class.equals(type)) {
            return Byte.valueOf(number.byteValue());
        }
        if (Short.TYPE == type || Short.class.equals(type)) {
            return Short.valueOf(number.shortValue());
        }
        if (Float.TYPE == type || Float.class.equals(type)) {
            return Float.valueOf(number.floatValue());
        }
        if (Number.class.equals(type)) {
            return number;
        }

        throw new ELException(MessageFactory.get("error.convert", number, number.getClass(), type));
    }

    /**
     * Coerces an object to a Number of the specified type.