List of usage examples for org.springframework.beans.factory.config ConstructorArgumentValues getArgumentCount
public int getArgumentCount()
From source file:org.springframework.beans.factory.support.ConstructorResolver.java
/** * Instantiate the bean using a named factory method. The method may be static, if the * bean definition parameter specifies a class, rather than a "factory-bean", or * an instance variable on a factory object itself configured using Dependency Injection. * <p>Implementation requires iterating over the static or instance methods with the * name specified in the RootBeanDefinition (the method may be overloaded) and trying * to match with the parameters. We don't have the types attached to constructor args, * so trial and error is the only way to go here. The explicitArgs array may contain * argument values passed in programmatically via the corresponding getBean method. * @param beanName the name of the bean/* w ww. j a v a 2 s . c o m*/ * @param mbd the merged bean definition for the bean * @param explicitArgs argument values passed in programmatically via the getBean * method, or {@code null} if none (-> use constructor argument values from bean definition) * @return a BeanWrapper for the new instance */ public BeanWrapper instantiateUsingFactoryMethod(final String beanName, final RootBeanDefinition mbd, @Nullable final Object[] explicitArgs) { BeanWrapperImpl bw = new BeanWrapperImpl(); this.beanFactory.initBeanWrapper(bw); Object factoryBean; Class<?> factoryClass; boolean isStatic; 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"); } factoryBean = this.beanFactory.getBean(factoryBeanName); if (mbd.isSingleton() && this.beanFactory.containsSingleton(beanName)) { throw new ImplicitlyAppearedSingletonException(); } factoryClass = factoryBean.getClass(); isStatic = false; } else { // It's a static factory method on the bean class. if (!mbd.hasBeanClass()) { throw new BeanDefinitionStoreException(mbd.getResourceDescription(), beanName, "bean definition declares neither a bean class nor a factory-bean reference"); } factoryBean = null; factoryClass = mbd.getBeanClass(); isStatic = true; } Method factoryMethodToUse = null; ArgumentsHolder argsHolderToUse = null; Object[] argsToUse = null; if (explicitArgs != null) { argsToUse = explicitArgs; } else { Object[] argsToResolve = null; synchronized (mbd.constructorArgumentLock) { factoryMethodToUse = (Method) mbd.resolvedConstructorOrFactoryMethod; if (factoryMethodToUse != null && mbd.constructorArgumentsResolved) { // Found a cached factory method... argsToUse = mbd.resolvedConstructorArguments; if (argsToUse == null) { argsToResolve = mbd.preparedConstructorArguments; } } } if (argsToResolve != null) { argsToUse = resolvePreparedArguments(beanName, mbd, bw, factoryMethodToUse, argsToResolve, true); } } if (factoryMethodToUse == null || argsToUse == null) { // Need to determine the factory method... // Try all methods with this name to see if they match the given arguments. factoryClass = ClassUtils.getUserClass(factoryClass); Method[] rawCandidates = getCandidateMethods(factoryClass, mbd); List<Method> candidateSet = new ArrayList<>(); for (Method candidate : rawCandidates) { if (Modifier.isStatic(candidate.getModifiers()) == isStatic && mbd.isFactoryMethod(candidate)) { candidateSet.add(candidate); } } Method[] candidates = candidateSet.toArray(new Method[0]); AutowireUtils.sortFactoryMethods(candidates); ConstructorArgumentValues resolvedValues = null; boolean autowiring = (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_CONSTRUCTOR); int minTypeDiffWeight = Integer.MAX_VALUE; Set<Method> ambiguousFactoryMethods = null; int minNrOfArgs; if (explicitArgs != null) { minNrOfArgs = explicitArgs.length; } else { // We don't have arguments passed in programmatically, so we need to resolve the // arguments specified in the constructor arguments held in the bean definition. if (mbd.hasConstructorArgumentValues()) { ConstructorArgumentValues cargs = mbd.getConstructorArgumentValues(); resolvedValues = new ConstructorArgumentValues(); minNrOfArgs = resolveConstructorArguments(beanName, mbd, bw, cargs, resolvedValues); } else { minNrOfArgs = 0; } } LinkedList<UnsatisfiedDependencyException> causes = null; for (Method candidate : candidates) { Class<?>[] paramTypes = candidate.getParameterTypes(); if (paramTypes.length >= minNrOfArgs) { ArgumentsHolder argsHolder; if (explicitArgs != null) { // Explicit arguments given -> arguments length must match exactly. if (paramTypes.length != explicitArgs.length) { continue; } argsHolder = new ArgumentsHolder(explicitArgs); } else { // Resolved constructor arguments: type conversion and/or autowiring necessary. try { String[] paramNames = null; ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer(); if (pnd != null) { paramNames = pnd.getParameterNames(candidate); } argsHolder = createArgumentArray(beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring, candidates.length == 1); } catch (UnsatisfiedDependencyException ex) { if (logger.isTraceEnabled()) { logger.trace("Ignoring factory method [" + candidate + "] of bean '" + beanName + "': " + ex); } // Swallow and try next overloaded factory method. if (causes == null) { causes = new LinkedList<>(); } causes.add(ex); continue; } } int typeDiffWeight = (mbd.isLenientConstructorResolution() ? argsHolder.getTypeDifferenceWeight(paramTypes) : argsHolder.getAssignabilityWeight(paramTypes)); // Choose this factory method if it represents the closest match. if (typeDiffWeight < minTypeDiffWeight) { factoryMethodToUse = candidate; argsHolderToUse = argsHolder; argsToUse = argsHolder.arguments; minTypeDiffWeight = typeDiffWeight; ambiguousFactoryMethods = null; } // Find out about ambiguity: In case of the same type difference weight // for methods with the same number of parameters, collect such candidates // and eventually raise an ambiguity exception. // However, only perform that check in non-lenient constructor resolution mode, // and explicitly ignore overridden methods (with the same parameter signature). else if (factoryMethodToUse != null && typeDiffWeight == minTypeDiffWeight && !mbd.isLenientConstructorResolution() && paramTypes.length == factoryMethodToUse.getParameterCount() && !Arrays.equals(paramTypes, factoryMethodToUse.getParameterTypes())) { if (ambiguousFactoryMethods == null) { ambiguousFactoryMethods = new LinkedHashSet<>(); ambiguousFactoryMethods.add(factoryMethodToUse); } ambiguousFactoryMethods.add(candidate); } } } if (factoryMethodToUse == null) { if (causes != null) { UnsatisfiedDependencyException ex = causes.removeLast(); for (Exception cause : causes) { this.beanFactory.onSuppressedException(cause); } throw ex; } List<String> argTypes = new ArrayList<>(minNrOfArgs); if (explicitArgs != null) { for (Object arg : explicitArgs) { argTypes.add(arg != null ? arg.getClass().getSimpleName() : "null"); } } else if (resolvedValues != null) { Set<ValueHolder> valueHolders = new LinkedHashSet<>(resolvedValues.getArgumentCount()); valueHolders.addAll(resolvedValues.getIndexedArgumentValues().values()); valueHolders.addAll(resolvedValues.getGenericArgumentValues()); for (ValueHolder value : valueHolders) { String argType = (value.getType() != null ? ClassUtils.getShortName(value.getType()) : (value.getValue() != null ? value.getValue().getClass().getSimpleName() : "null")); argTypes.add(argType); } } String argDesc = StringUtils.collectionToCommaDelimitedString(argTypes); throw new BeanCreationException(mbd.getResourceDescription(), beanName, "No matching factory method found: " + (mbd.getFactoryBeanName() != null ? "factory bean '" + mbd.getFactoryBeanName() + "'; " : "") + "factory method '" + mbd.getFactoryMethodName() + "(" + argDesc + ")'. " + "Check that a method with the specified name " + (minNrOfArgs > 0 ? "and arguments " : "") + "exists and that it is " + (isStatic ? "static" : "non-static") + "."); } else if (void.class == factoryMethodToUse.getReturnType()) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Invalid factory method '" + mbd.getFactoryMethodName() + "': needs to have a non-void return type!"); } else if (ambiguousFactoryMethods != null) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Ambiguous factory method matches found in bean '" + beanName + "' " + "(hint: specify index/type/name arguments for simple parameters to avoid type ambiguities): " + ambiguousFactoryMethods); } if (explicitArgs == null && argsHolderToUse != null) { argsHolderToUse.storeCache(mbd, factoryMethodToUse); } } try { Object beanInstance; if (System.getSecurityManager() != null) { final Object fb = factoryBean; final Method factoryMethod = factoryMethodToUse; final Object[] args = argsToUse; beanInstance = AccessController.doPrivileged( (PrivilegedAction<Object>) () -> this.beanFactory.getInstantiationStrategy() .instantiate(mbd, beanName, this.beanFactory, fb, factoryMethod, args), this.beanFactory.getAccessControlContext()); } else { beanInstance = this.beanFactory.getInstantiationStrategy().instantiate(mbd, beanName, this.beanFactory, factoryBean, factoryMethodToUse, argsToUse); } bw.setBeanInstance(beanInstance); return bw; } catch (Throwable ex) { throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Bean instantiation via factory method failed", ex); } }
From source file:org.springframework.beans.factory.support.ConstructorResolver.java
/** * 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. *//*from www . j av a 2 s . c o m*/ private int resolveConstructorArguments(String beanName, RootBeanDefinition mbd, BeanWrapper bw, ConstructorArgumentValues cargs, ConstructorArgumentValues resolvedValues) { TypeConverter customConverter = this.beanFactory.getCustomTypeConverter(); TypeConverter converter = (customConverter != null ? customConverter : 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; }
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 w w w .j av a 2 s.c om 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; }