Examples with AcceptsNullName org.apache.sling.models.spi.AcceptsNullName used on opensource projects

Example 1 with AcceptsNullName

use of org.apache.sling.models.spi.AcceptsNullName in project sling by apache.

the class ModelAdapterFactory method injectElement.

@CheckForNull
private RuntimeException injectElement(final InjectableElement element, final Object adaptable, @Nonnull final DisposalCallbackRegistry registry, final InjectCallback callback, @Nonnull final Map<ValuePreparer, Object> preparedValues) {
    InjectAnnotationProcessor annotationProcessor = null;
    String source = element.getSource();
    boolean wasInjectionSuccessful = false;
    // find an appropriate annotation processor
    for (InjectAnnotationProcessorFactory2 factory : injectAnnotationProcessorFactories2) {
        annotationProcessor = factory.createAnnotationProcessor(adaptable, element.getAnnotatedElement());
        if (annotationProcessor != null) {
            break;
        }
    }
    if (annotationProcessor == null) {
        for (InjectAnnotationProcessorFactory factory : injectAnnotationProcessorFactories) {
            annotationProcessor = factory.createAnnotationProcessor(adaptable, element.getAnnotatedElement());
            if (annotationProcessor != null) {
                break;
            }
        }
    }
    String name = getName(element, annotationProcessor);
    final Object injectionAdaptable = getAdaptable(adaptable, element, annotationProcessor);
    RuntimeException lastInjectionException = null;
    if (injectionAdaptable != null) {
        // prepare the set of injectors to process. if a source is given only use injectors with this name.
        final RankedServices<Injector> injectorsToProcess;
        if (StringUtils.isEmpty(source)) {
            injectorsToProcess = sortedInjectors;
        } else {
            injectorsToProcess = injectors.get(source);
            if (injectorsToProcess == null) {
                throw new IllegalArgumentException("No Sling Models Injector registered for source '" + source + "'.");
            }
        }
        // find the right injector
        for (Injector injector : injectorsToProcess) {
            if (name != null || injector instanceof AcceptsNullName) {
                Object preparedValue = injectionAdaptable;
                // only do the ValuePreparer optimization for the original adaptable
                if (injector instanceof ValuePreparer && adaptable == injectionAdaptable) {
                    final ValuePreparer preparer = (ValuePreparer) injector;
                    Object fromMap = preparedValues.get(preparer);
                    if (fromMap != null) {
                        preparedValue = fromMap;
                    } else {
                        preparedValue = preparer.prepareValue(injectionAdaptable);
                        preparedValues.put(preparer, preparedValue);
                    }
                }
                Object value = injector.getValue(preparedValue, name, element.getType(), element.getAnnotatedElement(), registry);
                if (value != null) {
                    lastInjectionException = callback.inject(element, value);
                    if (lastInjectionException == null) {
                        wasInjectionSuccessful = true;
                        break;
                    }
                }
            }
        }
    }
    // if injection failed, use default
    if (!wasInjectionSuccessful) {
        Result<Boolean> defaultInjectionResult = injectDefaultValue(element, annotationProcessor, callback);
        if (defaultInjectionResult.wasSuccessful()) {
            wasInjectionSuccessful = defaultInjectionResult.getValue();
            // log previous injection error, if there was any
            if (lastInjectionException != null && wasInjectionSuccessful) {
                log.debug("Although falling back to default value worked, injection into {} failed because of: " + lastInjectionException.getMessage(), element.getAnnotatedElement(), lastInjectionException);
            }
        } else {
            return defaultInjectionResult.getThrowable();
        }
    }
    // if default is not set, check if mandatory
    if (!wasInjectionSuccessful) {
        if (element.isOptional(annotationProcessor)) {
            // log previous injection error, if there was any
            if (lastInjectionException != null) {
                log.debug("Injection into optional element {} failed because of: " + lastInjectionException.getMessage(), element.getAnnotatedElement(), lastInjectionException);
            }
            if (element.isPrimitive()) {
                RuntimeException throwable = injectPrimitiveInitialValue(element, callback);
                if (throwable != null) {
                    return throwable;
                }
            }
        } else {
            if (lastInjectionException != null) {
                return lastInjectionException;
            } else {
                return new ModelClassException("No injector returned a non-null value!");
            }
        }
    }
    return null;
}