/** Attempt to convert a typed value to a boolean using the supplied type converter. */
public static boolean toBoolean(TypeConverter typeConverter, TypedValue typedValue) {
return (Boolean)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Boolean.class));
}
/** Attempt to convert a typed value to a float using the supplied type converter. */
public static float toFloat(TypeConverter typeConverter, TypedValue typedValue) {
return (Float)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Float.class));
}
/** Attempt to convert a typed value to an int using the supplied type converter. */
public static int toInt(TypeConverter typeConverter, TypedValue typedValue) {
return (Integer)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Integer.class));
}
/** Attempt to convert a typed value to a byte using the supplied type converter. */
public static byte toByte(TypeConverter typeConverter, TypedValue typedValue) {
return (Byte)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Byte.class));
}
/** Attempt to convert a typed value to a short using the supplied type converter. */
public static short toShort(TypeConverter typeConverter, TypedValue typedValue) {
return (Short)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Short.class));
}
/** Attempt to convert a typed value to a char using the supplied type converter. */
public static char toChar(TypeConverter typeConverter, TypedValue typedValue) {
return (Character)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Character.class));
}
/** Attempt to convert a typed value to a long using the supplied type converter. */
public static long toLong(TypeConverter typeConverter, TypedValue typedValue) {
return (Long)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Long.class));
}
/** Attempt to convert a typed value to a double using the supplied type converter. */
public static double toDouble(TypeConverter typeConverter, TypedValue typedValue) {
return (Double)
typeConverter.convertValue(
typedValue.getValue(),
typedValue.getTypeDescriptor(),
TypeDescriptor.valueOf(Double.class));
}
public Object convertValue(TypedValue value, TypeDescriptor targetTypeDescriptor)
throws EvaluationException {
Object val = value.getValue();
return this.relatedContext
.getTypeConverter()
.convertValue(val, TypeDescriptor.forObject(val), targetTypeDescriptor);
}
/**
* Compare the left operand to see it is an instance of the type specified as the right operand.
* The right operand must be a class.
*
* @param state the expression state
* @return true if the left operand is an instanceof of the right operand, otherwise false
* @throws EvaluationException if there is a problem evaluating the expression
*/
@Override
public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException {
TypedValue left = getLeftOperand().getValueInternal(state);
TypedValue right = getRightOperand().getValueInternal(state);
Object leftValue = left.getValue();
Object rightValue = right.getValue();
if (leftValue == null) {
return BooleanTypedValue.FALSE; // null is not an instanceof anything
}
if (rightValue == null || !(rightValue instanceof Class<?>)) {
throw new SpelEvaluationException(
getRightOperand().getStartPosition(),
SpelMessage.INSTANCEOF_OPERATOR_NEEDS_CLASS_OPERAND,
(rightValue == null ? "null" : rightValue.getClass().getName()));
}
Class<?> rightClass = (Class<?>) rightValue;
return BooleanTypedValue.forValue(rightClass.isAssignableFrom(leftValue.getClass()));
}
/**
* Determines if there is a type converter available in the specified context and attempts to use
* it to convert the supplied value to the specified type. Throws an exception if conversion is
* not possible.
*
* @param context the evaluation context that may define a type converter
* @param typedValue the value to convert and a type descriptor describing it
* @param targetType the type to attempt conversion to
* @return the converted value
* @throws EvaluationException if there is a problem during conversion or conversion of the value
* to the specified type is not supported
*/
@SuppressWarnings("unchecked")
public static <T> T convertTypedValue(
EvaluationContext context, TypedValue typedValue, Class<T> targetType) {
Object value = typedValue.getValue();
if ((targetType == null)
|| (value != null && ClassUtils.isAssignableValue(targetType, value))) {
return (T) value;
}
if (context != null) {
return (T)
context
.getTypeConverter()
.convertValue(
value, typedValue.getTypeDescriptor(), TypeDescriptor.valueOf(targetType));
}
throw new EvaluationException(
"Cannot convert value '" + value + "' to type '" + targetType.getName() + "'");
}
