public Map<?, ?> resolve(Invocation inv, ParamMetaData metaData) {
if (StringUtils.isNotEmpty(metaData.getParamName())) {
Class<?>[] genericTypes = (Class[]) metaData.getUserObject(this);
Class<?> keyType = genericTypes[0];
Class<?> valueType = genericTypes[1];
Map<?, ?> toConvert =
WebUtils.getParametersStartingWith(
inv.getRequest(), metaData.getParamName() + MAP_SEPARATOR);
if (toConvert != null) {
if (keyType != String.class || valueType != String.class) {
Map<Object, Object> ret = new HashMap<Object, Object>();
for (Map.Entry<?, ?> entry : toConvert.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
TypeConverter typeConverter = SafedTypeConverterFactory.getCurrentConverter();
if (keyType != String.class) {
key = typeConverter.convertIfNecessary(key, keyType);
}
if (valueType != String.class) {
value = typeConverter.convertIfNecessary(value, valueType);
}
ret.put(key, value);
}
return ret;
}
return toConvert;
}
}
return new HashMap<Object, Object>(2);
}
@SuppressWarnings("unchecked")
private static Object resolveArray(
Invocation inv, ParamMetaData metaData, Class<?> compnentType) {
if (compnentType == MultipartFile.class) {
String filterName = metaData.getParamName();
if (filterName == null) {
filterName = "";
}
if (inv.getRequest() instanceof MultipartRequest) {
List<MultipartFile> files = new LinkedList<MultipartFile>();
MultipartRequest multipartRequest = (MultipartRequest) inv.getRequest();
Iterator<String> names = multipartRequest.getFileNames();
while (names.hasNext()) {
String name = names.next();
if (name.startsWith(filterName)) {
files.add(multipartRequest.getFile(name));
}
}
return files.toArray(new MultipartFile[0]);
} else {
if (logger.isDebugEnabled()) {
logger.debug(
"cann't "
+ "set MultipartFile param to method "
+ ", the request is not a MultipartRequest");
}
}
} else {
Object toConvert = null;
for (String paramName : metaData.getParamNames()) {
if (paramName != null) {
toConvert = inv.getRequest().getParameterValues(paramName);
if (toConvert != null) {
break;
}
}
}
if (toConvert != null) {
if (((String[]) toConvert).length == 1) {
toConvert = ((String[]) toConvert)[0].split(",");
}
Class<?> arrayType;
if (metaData.getParamType().isArray()) {
arrayType = metaData.getParamType();
} else {
arrayType = arrayTypeMap.get(compnentType);
if (arrayType == null) {
arrayType = Array.newInstance((Class<?>) compnentType, 0).getClass();
}
}
TypeConverter typeConverter = SafedTypeConverterFactory.getCurrentConverter();
Object array = typeConverter.convertIfNecessary(toConvert, arrayType);
return array;
}
}
return Array.newInstance((Class<?>) compnentType, 0);
}
/** Resolve the prepared arguments stored in the given bean definition. */
private Object[] resolvePreparedArguments(
String beanName,
RootBeanDefinition mbd,
BeanWrapper bw,
Member methodOrCtor,
Object[] argsToResolve) {
Class<?>[] paramTypes =
(methodOrCtor instanceof Method
? ((Method) methodOrCtor).getParameterTypes()
: ((Constructor<?>) methodOrCtor).getParameterTypes());
TypeConverter converter =
(this.beanFactory.getCustomTypeConverter() != null
? this.beanFactory.getCustomTypeConverter()
: bw);
BeanDefinitionValueResolver valueResolver =
new BeanDefinitionValueResolver(this.beanFactory, beanName, mbd, converter);
Object[] resolvedArgs = new Object[argsToResolve.length];
for (int argIndex = 0; argIndex < argsToResolve.length; argIndex++) {
Object argValue = argsToResolve[argIndex];
MethodParameter methodParam = MethodParameter.forMethodOrConstructor(methodOrCtor, argIndex);
GenericTypeResolver.resolveParameterType(methodParam, methodOrCtor.getDeclaringClass());
if (argValue instanceof AutowiredArgumentMarker) {
argValue = resolveAutowiredArgument(methodParam, beanName, null, converter);
} else if (argValue instanceof BeanMetadataElement) {
argValue = valueResolver.resolveValueIfNecessary("constructor argument", argValue);
} else if (argValue instanceof String) {
argValue = this.beanFactory.evaluateBeanDefinitionString((String) argValue, mbd);
}
Class<?> paramType = paramTypes[argIndex];
try {
resolvedArgs[argIndex] = converter.convertIfNecessary(argValue, paramType, methodParam);
} catch (TypeMismatchException ex) {
String methodType =
(methodOrCtor instanceof Constructor ? "constructor" : "factory method");
throw new UnsatisfiedDependencyException(
mbd.getResourceDescription(),
beanName,
argIndex,
paramType,
"Could not convert "
+ methodType
+ " argument value of type ["
+ ObjectUtils.nullSafeClassName(argValue)
+ "] to required type ["
+ paramType.getName()
+ "]: "
+ ex.getMessage());
}
}
return resolvedArgs;
}
public Object[] resolve(final Invocation inv, final ParameterBindingResult parameterBindingResult)
throws Exception {
Object[] parameters = new Object[paramMetaDatas.length];
for (int i = 0; i < resolvers.length; i++) {
if (resolvers[i] == null) {
continue;
}
try {
if (logger.isDebugEnabled()) {
logger.debug(
"Resolves parameter "
+ paramMetaDatas[i].getParamType().getSimpleName()
+ " using "
+ resolvers[i].getClass().getName());
}
parameters[i] = resolvers[i].resolve(inv, paramMetaDatas[i]);
// afterPropertiesSet
if (parameters[i] instanceof InitializingBean) {
((InitializingBean) parameters[i]).afterPropertiesSet();
}
if (parameters[i] == null) {
DefValue defValudeAnnotation = paramMetaDatas[i].getAnnotation(DefValue.class);
if (defValudeAnnotation != null && paramMetaDatas[i].getParamType() == String.class) {
parameters[i] = defValudeAnnotation.value();
}
}
} catch (TypeMismatchException e) {
// 出现这个错误肯定是解析一般参数失败导致的，而非bean里面的某个属性值的解析失败
logger.debug("", e);
// 对简单类型的参数，设置一个默认值给它以支持对该方法的继续调用
if (paramMetaDatas[i].getParamType().isPrimitive()) {
DefValue defValudeAnnotation = paramMetaDatas[i].getAnnotation(DefValue.class);
if (defValudeAnnotation == null
|| DefValue.NATIVE_DEFAULT.equals(defValudeAnnotation.value())) {
// 对这最常用的类型做一下if-else判断，其他类型就简单使用converter来做吧
if (paramMetaDatas[i].getParamType() == int.class) {
parameters[i] = Integer.valueOf(0);
} else if (paramMetaDatas[i].getParamType() == long.class) {
parameters[i] = Long.valueOf(0);
} else if (paramMetaDatas[i].getParamType() == boolean.class) {
parameters[i] = Boolean.FALSE;
} else if (paramMetaDatas[i].getParamType() == double.class) {
parameters[i] = Double.valueOf(0);
} else if (paramMetaDatas[i].getParamType() == float.class) {
parameters[i] = Float.valueOf(0);
} else {
TypeConverter typeConverter = SafedTypeConverterFactory.getCurrentConverter();
parameters[i] =
typeConverter.convertIfNecessary("0", paramMetaDatas[i].getParamType());
}
} else {
TypeConverter typeConverter = SafedTypeConverterFactory.getCurrentConverter();
parameters[i] =
typeConverter.convertIfNecessary(
defValudeAnnotation.value(), paramMetaDatas[i].getParamType());
}
}
//
String paramName = parameterNames[i];
if (paramName == null) {
for (String name : paramMetaDatas[i].getParamNames()) {
if ((paramName = name) != null) {
break;
}
}
}
Assert.isTrue(paramName != null);
FieldError fieldError =
new FieldError( //
"method", // 该出错字段所在的对象的名字；对于这类异常我们统一规定名字为method
paramName, // 出错的字段的名字；取其参数名
inv.getParameter(paramName), // 被拒绝的值
true, // whether this error represents a binding failure (like a type mismatch);
// else, it is a validation failure
new String[] {e.getErrorCode()}, // "typeMismatch"
new String[] {
inv.getParameter(paramName)
}, // the array of arguments to be used to resolve this message
null // the default message to be used to resolve this message
);
parameterBindingResult.addError(fieldError);
} catch (Exception e) {
// 什么错误呢？比如很有可能是构造对象不能成功导致的错误，没有默认构造函数、构造函数执行失败等等
logger.error("", e);
throw e;
}
}
return parameters;
}
/**
* 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;
}
/** Match the given qualifier annotation against the candidate bean definition. */
protected boolean checkQualifier(
BeanDefinitionHolder bdHolder, Annotation annotation, TypeConverter typeConverter) {
Class<? extends Annotation> type = annotation.annotationType();
RootBeanDefinition bd = (RootBeanDefinition) bdHolder.getBeanDefinition();
AutowireCandidateQualifier qualifier = bd.getQualifier(type.getName());
if (qualifier == null) {
qualifier = bd.getQualifier(ClassUtils.getShortName(type));
}
if (qualifier == null) {
Annotation targetAnnotation = null;
if (bd.getResolvedFactoryMethod() != null) {
targetAnnotation = AnnotationUtils.getAnnotation(bd.getResolvedFactoryMethod(), type);
}
if (targetAnnotation == null) {
// look for matching annotation on the target class
if (this.beanFactory != null) {
Class<?> beanType = this.beanFactory.getType(bdHolder.getBeanName());
if (beanType != null) {
targetAnnotation =
AnnotationUtils.getAnnotation(ClassUtils.getUserClass(beanType), type);
}
}
if (targetAnnotation == null && bd.hasBeanClass()) {
targetAnnotation =
AnnotationUtils.getAnnotation(ClassUtils.getUserClass(bd.getBeanClass()), type);
}
}
if (targetAnnotation != null && targetAnnotation.equals(annotation)) {
return true;
}
}
Map<String, Object> attributes = AnnotationUtils.getAnnotationAttributes(annotation);
if (attributes.isEmpty() && qualifier == null) {
// if no attributes, the qualifier must be present
return false;
}
for (Map.Entry<String, Object> entry : attributes.entrySet()) {
String attributeName = entry.getKey();
Object expectedValue = entry.getValue();
Object actualValue = null;
// check qualifier first
if (qualifier != null) {
actualValue = qualifier.getAttribute(attributeName);
}
if (actualValue == null) {
// fall back on bean definition attribute
actualValue = bd.getAttribute(attributeName);
}
if (actualValue == null
&& attributeName.equals(AutowireCandidateQualifier.VALUE_KEY)
&& expectedValue instanceof String
&& bdHolder.matchesName((String) expectedValue)) {
// fall back on bean name (or alias) match
continue;
}
if (actualValue == null && qualifier != null) {
// fall back on default, but only if the qualifier is present
actualValue = AnnotationUtils.getDefaultValue(annotation, attributeName);
}
if (actualValue != null) {
actualValue = typeConverter.convertIfNecessary(actualValue, expectedValue.getClass());
}
if (!expectedValue.equals(actualValue)) {
return false;
}
}
return true;
}