@SuppressWarnings("unchecked")
protected Collection convertToTypedCollection(
Collection original, String propertyName, Class requiredType, TypeDescriptor typeDescriptor) {
boolean originalAllowed = requiredType.isInstance(original);
if (!originalAllowed && !Collection.class.isAssignableFrom(requiredType)) {
return original;
}
MethodParameter methodParam = typeDescriptor.getMethodParameter();
Class elementType = null;
if (methodParam != null) {
elementType = GenericCollectionTypeResolver.getCollectionParameterType(methodParam);
}
if (elementType == null
&& originalAllowed
&& !this.propertyEditorRegistry.hasCustomEditorForElement(null, propertyName)) {
return original;
}
Iterator it;
try {
it = original.iterator();
if (it == null) {
if (logger.isDebugEnabled()) {
logger.debug(
"Collection of type ["
+ original.getClass().getName()
+ "] returned null Iterator - injecting original Collection as-is");
}
return original;
}
} catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Cannot access Collection of type ["
+ original.getClass().getName()
+ "] - injecting original Collection as-is",
ex);
}
return original;
}
Collection convertedCopy;
try {
if (CollectionFactory.isApproximableCollectionType(requiredType)) {
convertedCopy = CollectionFactory.createApproximateCollection(original, original.size());
} else {
convertedCopy = (Collection) requiredType.newInstance();
}
} catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Cannot create copy of Collection type ["
+ original.getClass().getName()
+ "] - injecting original Collection as-is",
ex);
}
return original;
}
int i = 0;
for (; it.hasNext(); i++) {
Object element = it.next();
String indexedPropertyName = buildIndexedPropertyName(propertyName, i);
if (methodParam != null) {
methodParam.increaseNestingLevel();
}
Object convertedElement =
convertIfNecessary(indexedPropertyName, null, element, elementType, typeDescriptor);
if (methodParam != null) {
methodParam.decreaseNestingLevel();
}
try {
convertedCopy.add(convertedElement);
} catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Collection type ["
+ original.getClass().getName()
+ "] seems to be read-only - injecting original Collection as-is",
ex);
}
return original;
}
originalAllowed = originalAllowed && (element == convertedElement);
}
return (originalAllowed ? original : convertedCopy);
}
@SuppressWarnings("unchecked")
private Collection<?> convertToTypedCollection(
Collection<?> original,
String propertyName,
Class<?> requiredType,
TypeDescriptor typeDescriptor) {
if (!Collection.class.isAssignableFrom(requiredType)) {
return original;
}
boolean approximable = CollectionFactory.isApproximableCollectionType(requiredType);
if (!approximable && !canCreateCopy(requiredType)) {
if (logger.isDebugEnabled()) {
logger.debug(
"Custom Collection type ["
+ original.getClass().getName()
+ "] does not allow for creating a copy - injecting original Collection as-is");
}
return original;
}
boolean originalAllowed = requiredType.isInstance(original);
TypeDescriptor elementType = typeDescriptor.getElementTypeDescriptor();
if (elementType == null
&& originalAllowed
&& !this.propertyEditorRegistry.hasCustomEditorForElement(null, propertyName)) {
return original;
}
Iterator<?> it;
try {
it = original.iterator();
if (it == null) {
if (logger.isDebugEnabled()) {
logger.debug(
"Collection of type ["
+ original.getClass().getName()
+ "] returned null Iterator - injecting original Collection as-is");
}
return original;
}
} catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Cannot access Collection of type ["
+ original.getClass().getName()
+ "] - injecting original Collection as-is: "
+ ex);
}
return original;
}
Collection<Object> convertedCopy;
try {
if (approximable) {
convertedCopy = CollectionFactory.createApproximateCollection(original, original.size());
} else {
convertedCopy =
(Collection<Object>) ReflectionUtils.accessibleConstructor(requiredType).newInstance();
}
} catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Cannot create copy of Collection type ["
+ original.getClass().getName()
+ "] - injecting original Collection as-is: "
+ ex);
}
return original;
}
int i = 0;
for (; it.hasNext(); i++) {
Object element = it.next();
String indexedPropertyName = buildIndexedPropertyName(propertyName, i);
Object convertedElement =
convertIfNecessary(
indexedPropertyName,
null,
element,
(elementType != null ? elementType.getType() : null),
elementType);
try {
convertedCopy.add(convertedElement);
} catch (Throwable ex) {
if (logger.isDebugEnabled()) {
logger.debug(
"Collection type ["
+ original.getClass().getName()
+ "] seems to be read-only - injecting original Collection as-is: "
+ ex);
}
return original;
}
originalAllowed = originalAllowed && (element == convertedElement);
}
return (originalAllowed ? original : convertedCopy);
}