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package org.glassfish.jersey.internal.inject;
import java.lang.reflect.Type;
import javax.ws.rs.core.Context;
import javax.inject.Inject;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.util.ReflectionHelper;
import org.glassfish.hk2.api.ActiveDescriptor;
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 org.glassfish.hk2.api.TypeLiteral;
import org.glassfish.hk2.utilities.InjecteeImpl;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
/**
* Injection resolver for {@link Context @Context} injection annotation.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@Singleton
public class ContextInjectionResolver implements InjectionResolver<Context> {
/**
* Context injection resolver HK2 binder.
*/
public static final class Binder extends AbstractBinder {
@Override
protected void configure() {
// @Context
bind(ContextInjectionResolver.class).to(new TypeLiteral<InjectionResolver<Context>>() {
}).in(Singleton.class);
}
}
@Inject
private ServiceLocator serviceLocator;
@Override
public Object resolve(Injectee injectee, ServiceHandle<?> root) {
Type requiredType = injectee.getRequiredType();
boolean isHk2Factory = ReflectionHelper.isSubClassOf(requiredType, Factory.class);
Injectee newInjectee;
if (isHk2Factory) {
newInjectee = getInjectee(injectee, ReflectionHelper.getTypeArgument(requiredType, 0));
} else {
newInjectee = injectee;
}
ActiveDescriptor<?> ad = serviceLocator.getInjecteeDescriptor(newInjectee);
if (ad != null) {
final ServiceHandle handle = serviceLocator.getServiceHandle(ad, newInjectee);
if (isHk2Factory) {
return asFactory(handle);
} else {
return handle.getService();
}
}
return null;
}
private Factory asFactory(final ServiceHandle handle) {
return new Factory() {
@Override
public Object provide() {
return handle.getService();
}
@Override
public void dispose(Object instance) {
//not used
}
};
}
private Injectee getInjectee(final Injectee injectee, final Type requiredType) {
return new RequiredTypeOverridingInjectee(injectee, requiredType);
}
private static class RequiredTypeOverridingInjectee extends InjecteeImpl {
private static final long serialVersionUID = -3740895548611880187L;
private RequiredTypeOverridingInjectee(final Injectee injectee, final Type requiredType) {
super(injectee);
setRequiredType(requiredType);
}
}
@Override
public boolean isConstructorParameterIndicator() {
return true;
}
@Override
public boolean isMethodParameterIndicator() {
return false;
}
}