List of usage examples for org.springframework.beans.factory.config ConstructorArgumentValues getGenericArgumentValue
@Nullable
public ValueHolder getGenericArgumentValue(@Nullable Class<?> requiredType, @Nullable String requiredName,
@Nullable Set<ValueHolder> usedValueHolders)
From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java
/** * Determine the target type for the given bean definition which is based on * a factory method. Only called if there is no singleton instance registered * for the target bean already.//w w w. j a v a 2 s. com * <p>This implementation determines the type matching {@link #createBean}'s * different creation strategies. As far as possible, we'll perform static * type checking to avoid creation of the target bean. * @param beanName the name of the bean (for error handling purposes) * @param mbd the merged bean definition for the bean * @param typesToMatch the types to match in case of internal type matching purposes * (also signals that the returned {@code Class} will never be exposed to application code) * @return the type for the bean if determinable, or {@code null} otherwise * @see #createBean */ @Nullable protected Class<?> getTypeForFactoryMethod(String beanName, RootBeanDefinition mbd, Class<?>... typesToMatch) { ResolvableType cachedReturnType = mbd.factoryMethodReturnType; if (cachedReturnType != null) { return cachedReturnType.resolve(); } Class<?> factoryClass; boolean isStatic = true; String factoryBeanName = mbd.getFactoryBeanName(); if (factoryBeanName != null) { if (factoryBeanName.equals(beanName)) { throw new BeanDefinitionStoreException(mbd.getResourceDescription(), beanName, "factory-bean reference points back to the same bean definition"); } // Check declared factory method return type on factory class. factoryClass = getType(factoryBeanName); isStatic = false; } else { // Check declared factory method return type on bean class. factoryClass = resolveBeanClass(mbd, beanName, typesToMatch); } if (factoryClass == null) { return null; } factoryClass = ClassUtils.getUserClass(factoryClass); // If all factory methods have the same return type, return that type. // Can't clearly figure out exact method due to type converting / autowiring! Class<?> commonType = null; Method uniqueCandidate = null; int minNrOfArgs = (mbd.hasConstructorArgumentValues() ? mbd.getConstructorArgumentValues().getArgumentCount() : 0); Method[] candidates = this.factoryMethodCandidateCache.computeIfAbsent(factoryClass, ReflectionUtils::getUniqueDeclaredMethods); for (Method candidate : candidates) { if (Modifier.isStatic(candidate.getModifiers()) == isStatic && mbd.isFactoryMethod(candidate) && candidate.getParameterCount() >= minNrOfArgs) { // Declared type variables to inspect? if (candidate.getTypeParameters().length > 0) { try { // Fully resolve parameter names and argument values. Class<?>[] paramTypes = candidate.getParameterTypes(); String[] paramNames = null; ParameterNameDiscoverer pnd = getParameterNameDiscoverer(); if (pnd != null) { paramNames = pnd.getParameterNames(candidate); } ConstructorArgumentValues cav = mbd.getConstructorArgumentValues(); Set<ConstructorArgumentValues.ValueHolder> usedValueHolders = new HashSet<>( paramTypes.length); Object[] args = new Object[paramTypes.length]; for (int i = 0; i < args.length; i++) { ConstructorArgumentValues.ValueHolder valueHolder = cav.getArgumentValue(i, paramTypes[i], (paramNames != null ? paramNames[i] : null), usedValueHolders); if (valueHolder == null) { valueHolder = cav.getGenericArgumentValue(null, null, usedValueHolders); } if (valueHolder != null) { args[i] = valueHolder.getValue(); usedValueHolders.add(valueHolder); } } Class<?> returnType = AutowireUtils.resolveReturnTypeForFactoryMethod(candidate, args, getBeanClassLoader()); uniqueCandidate = (commonType == null && returnType == candidate.getReturnType() ? candidate : null); commonType = ClassUtils.determineCommonAncestor(returnType, commonType); if (commonType == null) { // Ambiguous return types found: return null to indicate "not determinable". return null; } } catch (Throwable ex) { if (logger.isDebugEnabled()) { logger.debug("Failed to resolve generic return type for factory method: " + ex); } } } else { uniqueCandidate = (commonType == null ? candidate : null); commonType = ClassUtils.determineCommonAncestor(candidate.getReturnType(), commonType); if (commonType == null) { // Ambiguous return types found: return null to indicate "not determinable". return null; } } } } if (commonType == null) { return null; } // Common return type found: all factory methods return same type. For a non-parameterized // unique candidate, cache the full type declaration context of the target factory method. cachedReturnType = (uniqueCandidate != null ? ResolvableType.forMethodReturnType(uniqueCandidate) : ResolvableType.forClass(commonType)); mbd.factoryMethodReturnType = cachedReturnType; return cachedReturnType.resolve(); }
From source file:org.springframework.beans.factory.support.ConstructorResolver.java
/** * Create an array of arguments to invoke a constructor or factory method, * given the resolved constructor argument values. *///from ww w .ja v a 2 s . c o m private ArgumentsHolder createArgumentArray(String beanName, RootBeanDefinition mbd, @Nullable ConstructorArgumentValues resolvedValues, BeanWrapper bw, Class<?>[] paramTypes, @Nullable String[] paramNames, Executable executable, boolean autowiring, boolean fallback) throws UnsatisfiedDependencyException { TypeConverter customConverter = this.beanFactory.getCustomTypeConverter(); TypeConverter converter = (customConverter != null ? customConverter : bw); ArgumentsHolder args = new ArgumentsHolder(paramTypes.length); Set<ConstructorArgumentValues.ValueHolder> usedValueHolders = new HashSet<>(paramTypes.length); Set<String> autowiredBeanNames = new LinkedHashSet<>(4); for (int paramIndex = 0; paramIndex < paramTypes.length; paramIndex++) { Class<?> paramType = paramTypes[paramIndex]; String paramName = (paramNames != null ? paramNames[paramIndex] : ""); // Try to find matching constructor argument value, either indexed or generic. ConstructorArgumentValues.ValueHolder valueHolder = null; if (resolvedValues != null) { 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 || paramTypes.length == resolvedValues.getArgumentCount())) { 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 { MethodParameter methodParam = MethodParameter.forExecutable(executable, paramIndex); try { convertedValue = converter.convertIfNecessary(originalValue, paramType, methodParam); } catch (TypeMismatchException ex) { throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName, new InjectionPoint(methodParam), "Could not convert argument value of type [" + ObjectUtils.nullSafeClassName(valueHolder.getValue()) + "] to required type [" + paramType.getName() + "]: " + ex.getMessage()); } Object sourceHolder = valueHolder.getSource(); if (sourceHolder instanceof ConstructorArgumentValues.ValueHolder) { Object sourceValue = ((ConstructorArgumentValues.ValueHolder) sourceHolder).getValue(); args.resolveNecessary = true; args.preparedArguments[paramIndex] = sourceValue; } } args.arguments[paramIndex] = convertedValue; args.rawArguments[paramIndex] = originalValue; } else { MethodParameter methodParam = MethodParameter.forExecutable(executable, paramIndex); // 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, new InjectionPoint(methodParam), "Ambiguous argument values for parameter of type [" + paramType.getName() + "] - did you specify the correct bean references as arguments?"); } try { Object autowiredArgument = resolveAutowiredArgument(methodParam, beanName, autowiredBeanNames, converter, fallback); 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, new InjectionPoint(methodParam), ex); } } } for (String autowiredBeanName : autowiredBeanNames) { this.beanFactory.registerDependentBean(autowiredBeanName, beanName); if (logger.isDebugEnabled()) { logger.debug("Autowiring by type from bean name '" + beanName + "' via " + (executable instanceof Constructor ? "constructor" : "factory method") + " to bean named '" + autowiredBeanName + "'"); } } return args; }