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package org.glassfish.jersey.server.internal.inject;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.Set;
import javax.ws.rs.Encoded;
import javax.inject.Inject;
import org.glassfish.jersey.internal.inject.Providers;
import org.glassfish.jersey.internal.util.ReflectionHelper;
import org.glassfish.jersey.server.model.Parameter;
import org.glassfish.jersey.server.spi.internal.ValueFactoryProvider;
import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.InjectionResolver;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import jersey.repackaged.com.google.common.base.Predicate;
import jersey.repackaged.com.google.common.collect.Sets;
/**
* Abstract base class for resolving JAX-RS {@code @XxxParam} injection.
*
* @param <A> supported parameter injection annotation.
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public abstract class ParamInjectionResolver<A extends Annotation> implements InjectionResolver<A> {
@Inject
private ServiceLocator locator;
private final Predicate<ValueFactoryProvider> concreteValueFactoryClassFilter;
/**
* Initialize the base parameter injection resolver.
*
* @param valueFactoryProviderClass parameter value factory provider class.
*/
public ParamInjectionResolver(final Class<? extends ValueFactoryProvider> valueFactoryProviderClass) {
this.concreteValueFactoryClassFilter = new Predicate<ValueFactoryProvider>() {
@Override
public boolean apply(ValueFactoryProvider input) {
return valueFactoryProviderClass.isInstance(input);
}
};
}
@Override
@SuppressWarnings("unchecked")
public Object resolve(Injectee injectee, ServiceHandle<?> root) {
AnnotatedElement annotated = injectee.getParent();
Annotation[] annotations;
if (annotated.getClass().equals(Constructor.class)) {
annotations = ((Constructor) annotated).getParameterAnnotations()[injectee.getPosition()];
} else {
annotations = annotated.getDeclaredAnnotations();
}
Class componentClass = injectee.getInjecteeClass();
Type genericType = injectee.getRequiredType();
boolean isHk2Factory = ReflectionHelper.isSubClassOf(genericType, Factory.class);
final Type targetGenericType;
if (isHk2Factory) {
targetGenericType = ReflectionHelper.getTypeArgument(genericType, 0);
} else {
targetGenericType = genericType;
}
final Class<?> targetType = ReflectionHelper.erasure(targetGenericType);
Set<ValueFactoryProvider> providers = Sets.filter(Providers.getProviders(locator, ValueFactoryProvider.class),
concreteValueFactoryClassFilter);
final ValueFactoryProvider valueFactoryProvider = providers.iterator().next(); // get first provider in the set
final Parameter parameter = Parameter.create(
componentClass,
componentClass,
hasEncodedAnnotation(injectee),
targetType,
targetGenericType,
annotations);
final Factory<?> valueFactory = valueFactoryProvider.getValueFactory(parameter);
if (valueFactory != null) {
if (isHk2Factory) {
return valueFactory;
} else {
return valueFactory.provide();
}
}
return null;
}
private boolean hasEncodedAnnotation(Injectee injectee) {
AnnotatedElement element = injectee.getParent();
final boolean isConstructor = element instanceof Constructor;
final boolean isMethod = element instanceof Method;
// if injectee is method or constructor, check its parameters
if (isConstructor || isMethod) {
Annotation annotations[];
if (isMethod) {
annotations = ((Method) element).getParameterAnnotations()[injectee.getPosition()];
} else {
annotations = ((Constructor) element).getParameterAnnotations()[injectee.getPosition()];
}
for (Annotation annotation : annotations) {
if (annotation.annotationType().equals(Encoded.class)) {
return true;
}
}
}
// check injectee itself (method, constructor or field)
if (element.isAnnotationPresent(Encoded.class)) {
return true;
}
// check class which contains injectee
Class clazz = injectee.getInjecteeClass();
return clazz.isAnnotationPresent(Encoded.class);
}
@Override
public boolean isConstructorParameterIndicator() {
return true;
}
@Override
public boolean isMethodParameterIndicator() {
return false;
}
}