Example usage for org.springframework.beans.factory.support BeanDefinitionValueResolver resolveValueIfNecessary

Introduction

In this page you can find the example usage for org.springframework.beans.factory.support BeanDefinitionValueResolver resolveValueIfNecessary.

Prototype

@Nullable
public Object resolveValueIfNecessary(Object argName, @Nullable Object value) 

Source Link

Document

Given a PropertyValue, return a value, resolving any references to other beans in the factory if necessary.

Usage

From source file:org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.java

/**
 * Apply the given property values, resolving any runtime references
 * to other beans in this bean factory. Must use deep copy, so we
 * don't permanently modify this property.
 * @param beanName the bean name passed for better exception information
 * @param mbd the merged bean definition
 * @param bw the BeanWrapper wrapping the target object
 * @param pvs the new property values//from w ww . j a v a  2s.  c  o  m
 */
protected void applyPropertyValues(String beanName, BeanDefinition mbd, BeanWrapper bw, PropertyValues pvs) {
    if (pvs.isEmpty()) {
        return;
    }

    if (System.getSecurityManager() != null && bw instanceof BeanWrapperImpl) {
        ((BeanWrapperImpl) bw).setSecurityContext(getAccessControlContext());
    }

    MutablePropertyValues mpvs = null;
    List<PropertyValue> original;

    if (pvs instanceof MutablePropertyValues) {
        mpvs = (MutablePropertyValues) pvs;
        if (mpvs.isConverted()) {
            // Shortcut: use the pre-converted values as-is.
            try {
                bw.setPropertyValues(mpvs);
                return;
            } catch (BeansException ex) {
                throw new BeanCreationException(mbd.getResourceDescription(), beanName,
                        "Error setting property values", ex);
            }
        }
        original = mpvs.getPropertyValueList();
    } else {
        original = Arrays.asList(pvs.getPropertyValues());
    }

    TypeConverter converter = getCustomTypeConverter();
    if (converter == null) {
        converter = bw;
    }
    BeanDefinitionValueResolver valueResolver = new BeanDefinitionValueResolver(this, beanName, mbd, converter);

    // Create a deep copy, resolving any references for values.
    List<PropertyValue> deepCopy = new ArrayList<>(original.size());
    boolean resolveNecessary = false;
    for (PropertyValue pv : original) {
        if (pv.isConverted()) {
            deepCopy.add(pv);
        } else {
            String propertyName = pv.getName();
            Object originalValue = pv.getValue();
            Object resolvedValue = valueResolver.resolveValueIfNecessary(pv, originalValue);
            Object convertedValue = resolvedValue;
            boolean convertible = bw.isWritableProperty(propertyName)
                    && !PropertyAccessorUtils.isNestedOrIndexedProperty(propertyName);
            if (convertible) {
                convertedValue = convertForProperty(resolvedValue, propertyName, bw, converter);
            }
            // Possibly store converted value in merged bean definition,
            // in order to avoid re-conversion for every created bean instance.
            if (resolvedValue == originalValue) {
                if (convertible) {
                    pv.setConvertedValue(convertedValue);
                }
                deepCopy.add(pv);
            } else if (convertible && originalValue instanceof TypedStringValue
                    && !((TypedStringValue) originalValue).isDynamic()
                    && !(convertedValue instanceof Collection || ObjectUtils.isArray(convertedValue))) {
                pv.setConvertedValue(convertedValue);
                deepCopy.add(pv);
            } else {
                resolveNecessary = true;
                deepCopy.add(new PropertyValue(pv, convertedValue));
            }
        }
    }
    if (mpvs != null && !resolveNecessary) {
        mpvs.setConverted();
    }

    // Set our (possibly massaged) deep copy.
    try {
        bw.setPropertyValues(new MutablePropertyValues(deepCopy));
    } catch (BeansException ex) {
        throw new BeanCreationException(mbd.getResourceDescription(), beanName, "Error setting property values",
                ex);
    }
}

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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  w w  w .  j a v 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;
}

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From source file:org.springframework.beans.factory.support.ConstructorResolver.java

/**
 * Resolve the prepared arguments stored in the given bean definition.
 *//*w w  w. j a  v  a  2 s  . com*/
private Object[] resolvePreparedArguments(String beanName, RootBeanDefinition mbd, BeanWrapper bw,
        Executable executable, Object[] argsToResolve, boolean fallback) {

    TypeConverter customConverter = this.beanFactory.getCustomTypeConverter();
    TypeConverter converter = (customConverter != null ? customConverter : bw);
    BeanDefinitionValueResolver valueResolver = new BeanDefinitionValueResolver(this.beanFactory, beanName, mbd,
            converter);
    Class<?>[] paramTypes = executable.getParameterTypes();

    Object[] resolvedArgs = new Object[argsToResolve.length];
    for (int argIndex = 0; argIndex < argsToResolve.length; argIndex++) {
        Object argValue = argsToResolve[argIndex];
        MethodParameter methodParam = MethodParameter.forExecutable(executable, argIndex);
        GenericTypeResolver.resolveParameterType(methodParam, executable.getDeclaringClass());
        if (argValue instanceof AutowiredArgumentMarker) {
            argValue = resolveAutowiredArgument(methodParam, beanName, null, converter, fallback);
        } 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) {
            throw new UnsatisfiedDependencyException(mbd.getResourceDescription(), beanName,
                    new InjectionPoint(methodParam),
                    "Could not convert argument value of type [" + ObjectUtils.nullSafeClassName(argValue)
                            + "] to required type [" + paramType.getName() + "]: " + ex.getMessage());
        }
    }
    return resolvedArgs;
}

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