/**
* Resolve the constructor arguments for this bean into the resolvedValues object. This may
* involve looking up other beans.
*
* <p>This method is also used for handling invocations of static factory methods.
*/
private int resolveConstructorArguments(
String beanName,
RootBeanDefinition mbd,
BeanWrapper bw,
ConstructorArgumentValues cargs,
ConstructorArgumentValues resolvedValues) {
TypeConverter converter =
(this.beanFactory.getCustomTypeConverter() != null
? this.beanFactory.getCustomTypeConverter()
: bw);
BeanDefinitionValueResolver valueResolver =
new BeanDefinitionValueResolver(this.beanFactory, beanName, mbd, converter);
int minNrOfArgs = cargs.getArgumentCount();
for (Map.Entry<Integer, ConstructorArgumentValues.ValueHolder> entry :
cargs.getIndexedArgumentValues().entrySet()) {
int index = entry.getKey();
if (index < 0) {
throw new BeanCreationException(
mbd.getResourceDescription(), beanName, "Invalid constructor argument index: " + index);
}
if (index > minNrOfArgs) {
minNrOfArgs = index + 1;
}
ConstructorArgumentValues.ValueHolder valueHolder = entry.getValue();
if (valueHolder.isConverted()) {
resolvedValues.addIndexedArgumentValue(index, valueHolder);
} else {
Object resolvedValue =
valueResolver.resolveValueIfNecessary("constructor argument", valueHolder.getValue());
ConstructorArgumentValues.ValueHolder resolvedValueHolder =
new ConstructorArgumentValues.ValueHolder(
resolvedValue, valueHolder.getType(), valueHolder.getName());
resolvedValueHolder.setSource(valueHolder);
resolvedValues.addIndexedArgumentValue(index, resolvedValueHolder);
}
}
for (ConstructorArgumentValues.ValueHolder valueHolder : cargs.getGenericArgumentValues()) {
if (valueHolder.isConverted()) {
resolvedValues.addGenericArgumentValue(valueHolder);
} else {
Object resolvedValue =
valueResolver.resolveValueIfNecessary("constructor argument", valueHolder.getValue());
ConstructorArgumentValues.ValueHolder resolvedValueHolder =
new ConstructorArgumentValues.ValueHolder(
resolvedValue, valueHolder.getType(), valueHolder.getName());
resolvedValueHolder.setSource(valueHolder);
resolvedValues.addGenericArgumentValue(resolvedValueHolder);
}
}
return minNrOfArgs;
}
/**
* Create an array of arguments to invoke a constructor or factory method, given the resolved
* constructor argument values.
*/
private ArgumentsHolder createArgumentArray(
String beanName,
RootBeanDefinition mbd,
ConstructorArgumentValues resolvedValues,
BeanWrapper bw,
Class<?>[] paramTypes,
String[] paramNames,
Object methodOrCtor,
boolean autowiring)
throws UnsatisfiedDependencyException {
String methodType = (methodOrCtor instanceof Constructor ? "constructor" : "factory method");
TypeConverter converter =
(this.beanFactory.getCustomTypeConverter() != null
? this.beanFactory.getCustomTypeConverter()
: bw);
ArgumentsHolder args = new ArgumentsHolder(paramTypes.length);
Set<ConstructorArgumentValues.ValueHolder> usedValueHolders =
new HashSet<ConstructorArgumentValues.ValueHolder>(paramTypes.length);
Set<String> autowiredBeanNames = new LinkedHashSet<String>(4);
for (int paramIndex = 0; paramIndex < paramTypes.length; paramIndex++) {
Class<?> paramType = paramTypes[paramIndex];
String paramName = (paramNames != null ? paramNames[paramIndex] : null);
// Try to find matching constructor argument value, either indexed or generic.
ConstructorArgumentValues.ValueHolder valueHolder =
resolvedValues.getArgumentValue(paramIndex, paramType, paramName, usedValueHolders);
// If we couldn't find a direct match and are not supposed to autowire,
// let's try the next generic, untyped argument value as fallback:
// it could match after type conversion (for example, String -> int).
if (valueHolder == null && !autowiring) {
valueHolder = resolvedValues.getGenericArgumentValue(null, null, usedValueHolders);
}
if (valueHolder != null) {
// We found a potential match - let's give it a try.
// Do not consider the same value definition multiple times!
usedValueHolders.add(valueHolder);
Object originalValue = valueHolder.getValue();
Object convertedValue;
if (valueHolder.isConverted()) {
convertedValue = valueHolder.getConvertedValue();
args.preparedArguments[paramIndex] = convertedValue;
} else {
ConstructorArgumentValues.ValueHolder sourceHolder =
(ConstructorArgumentValues.ValueHolder) valueHolder.getSource();
Object sourceValue = sourceHolder.getValue();
try {
convertedValue =
converter.convertIfNecessary(
originalValue,
paramType,
MethodParameter.forMethodOrConstructor(methodOrCtor, paramIndex));
// TODO re-enable once race condition has been found (SPR-7423)
/*
if (originalValue == sourceValue || sourceValue instanceof TypedStringValue) {
// Either a converted value or still the original one: store converted value.
sourceHolder.setConvertedValue(convertedValue);
args.preparedArguments[paramIndex] = convertedValue;
}
else {
*/
args.resolveNecessary = true;
args.preparedArguments[paramIndex] = sourceValue;
// }
} catch (TypeMismatchException ex) {
throw new UnsatisfiedDependencyException(
mbd.getResourceDescription(),
beanName,
paramIndex,
paramType,
"Could not convert "
+ methodType
+ " argument value of type ["
+ ObjectUtils.nullSafeClassName(valueHolder.getValue())
+ "] to required type ["
+ paramType.getName()
+ "]: "
+ ex.getMessage());
}
}
args.arguments[paramIndex] = convertedValue;
args.rawArguments[paramIndex] = originalValue;
} else {
// No explicit match found: we're either supposed to autowire or
// have to fail creating an argument array for the given constructor.
if (!autowiring) {
throw new UnsatisfiedDependencyException(
mbd.getResourceDescription(),
beanName,
paramIndex,
paramType,
"Ambiguous "
+ methodType
+ " argument types - "
+ "did you specify the correct bean references as "
+ methodType
+ " arguments?");
}
try {
MethodParameter param = MethodParameter.forMethodOrConstructor(methodOrCtor, paramIndex);
Object autowiredArgument =
resolveAutowiredArgument(param, beanName, autowiredBeanNames, converter);
args.rawArguments[paramIndex] = autowiredArgument;
args.arguments[paramIndex] = autowiredArgument;
args.preparedArguments[paramIndex] = new AutowiredArgumentMarker();
args.resolveNecessary = true;
} catch (BeansException ex) {
throw new UnsatisfiedDependencyException(
mbd.getResourceDescription(), beanName, paramIndex, paramType, ex);
}
}
}
for (String autowiredBeanName : autowiredBeanNames) {
this.beanFactory.registerDependentBean(autowiredBeanName, beanName);
if (this.beanFactory.logger.isDebugEnabled()) {
this.beanFactory.logger.debug(
"Autowiring by type from bean name '"
+ beanName
+ "' via "
+ methodType
+ " to bean named '"
+ autowiredBeanName
+ "'");
}
}
return args;
}