/** * 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; }