LegacyConfigPostProcessor.java 文件源码

/**
 * Given a bean name (assumed to implement {@link org.springframework.core.io.support.PropertiesLoaderSupport})
 * checks whether it already references the <code>global-properties</code> bean. If not, 'upgrades' the bean by
 * appending all additional resources it mentions in its <code>locations</code> property to
 * <code>globalPropertyLocations</code>, except for those resources mentioned in <code>newLocations</code>. A
 * reference to <code>global-properties</code> will then be added and the resource list in
 * <code>newLocations<code> will then become the new <code>locations</code> list for the bean.
 * 
 * @param beanFactory
 *            the bean factory
 * @param globalPropertyLocations
 *            the list of global property locations to be appended to
 * @param beanName
 *            the bean name
 * @param newLocations
 *            the new locations to be set on the bean
 * @return the mutable property values
 */
@SuppressWarnings("unchecked")
private MutablePropertyValues processLocations(ConfigurableListableBeanFactory beanFactory,
        Collection<Object> globalPropertyLocations, String beanName, String[] newLocations)
{
    // Get the bean an check its existing properties value
    MutablePropertyValues beanProperties = beanFactory.getBeanDefinition(beanName).getPropertyValues();
    PropertyValue pv = beanProperties.getPropertyValue(LegacyConfigPostProcessor.PROPERTY_PROPERTIES);
    Object value;

    // If the properties value already references the global-properties bean, we have nothing else to do. Otherwise,
    // we have to 'upgrade' the bean definition.
    if (pv == null || (value = pv.getValue()) == null || !(value instanceof BeanReference)
            || ((BeanReference) value).getBeanName().equals(LegacyConfigPostProcessor.BEAN_NAME_GLOBAL_PROPERTIES))
    {
        // Convert the array of new locations to a managed list of type string values, so that it is
        // compatible with a bean definition
        Collection<Object> newLocationList = new ManagedList(newLocations.length);
        if (newLocations != null && newLocations.length > 0)
        {
            for (String preserveLocation : newLocations)
            {
                newLocationList.add(new TypedStringValue(preserveLocation));
            }
        }

        // If there is currently a locations list, process it
        pv = beanProperties.getPropertyValue(LegacyConfigPostProcessor.PROPERTY_LOCATIONS);
        if (pv != null && (value = pv.getValue()) != null && value instanceof Collection)
        {
            Collection<Object> locations = (Collection<Object>) value;

            // Compute the set of locations that need to be added to globalPropertyLocations (preserving order) and
            // warn about each
            Set<Object> addedLocations = new LinkedHashSet<Object>(locations);
            addedLocations.removeAll(globalPropertyLocations);
            addedLocations.removeAll(newLocationList);

            for (Object location : addedLocations)
            {
                LegacyConfigPostProcessor.logger.warn("Legacy configuration detected: adding "
                        + (location instanceof TypedStringValue ? ((TypedStringValue) location).getValue()
                                : location.toString()) + " to global-properties definition");
                globalPropertyLocations.add(location);
            }

        }
        // Ensure the bean now references global-properties
        beanProperties.addPropertyValue(LegacyConfigPostProcessor.PROPERTY_PROPERTIES, new RuntimeBeanReference(
                LegacyConfigPostProcessor.BEAN_NAME_GLOBAL_PROPERTIES));

        // Ensure the new location list is now set on the bean
        if (newLocationList.size() > 0)
        {
            beanProperties.addPropertyValue(LegacyConfigPostProcessor.PROPERTY_LOCATIONS, newLocationList);
        }
        else
        {
            beanProperties.removePropertyValue(LegacyConfigPostProcessor.PROPERTY_LOCATIONS);
        }
    }
    return beanProperties;
}