/**
* Casts the specified value to Double data type.
*
* @see DataType#DOUBLE
*/
private static Double toDouble(Object value) {
if (value instanceof Double) {
return (Double) value;
} else if ((value instanceof Float) || (value instanceof Integer)) {
Number number = (Number) value;
return Double.valueOf(number.doubleValue());
}
throw new TypeCheckException(DataType.DOUBLE, value);
}
/**
* Casts the specified value to Float data type.
*
* @see DataType#FLOAT
*/
private static Float toFloat(Object value) {
if (value instanceof Float) {
return (Float) value;
} else if (value instanceof Integer) {
Number number = (Number) value;
return Float.valueOf(number.floatValue());
}
throw new TypeCheckException(DataType.FLOAT, value);
}
/**
* Casts the specified value to String data type.
*
* @see DataType#STRING
*/
private static String toString(Object value) {
if (value instanceof String) {
return (String) value;
} else if ((value instanceof Double)
|| (value instanceof Float)
|| (value instanceof Integer)) {
Number number = (Number) value;
return number.toString();
}
throw new TypeCheckException(DataType.STRING, value);
}
private static Number cast(DataType dataType, Number number) {
switch (dataType) {
case INTEGER:
if (number instanceof Integer) {
return number;
}
return Integer.valueOf(number.intValue());
case FLOAT:
if (number instanceof Float) {
return number;
}
return Float.valueOf(number.floatValue());
case DOUBLE:
if (number instanceof Double) {
return number;
}
return Double.valueOf(number.doubleValue());
default:
break;
}
throw new EvaluationException();
}