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package org.glassfish.jersey.internal.inject;
import java.util.Iterator;
import javax.ws.rs.WebApplicationException;
import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.internal.ServiceFinder;
/**
* Injection binding utility methods.
*
* @author Tom Beerbower
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public class Injections {
/**
* Creates a {@link InjectionManager} without parent and initial binder.
*
* @return a injection manager with all the bindings.
*/
public static InjectionManager createInjectionManager() {
return lookupInjectionManagerFactory().create();
}
/**
* Creates a {@link InjectionManager} with initial binder that is immediately registered.
*
* @param binder custom the {@link Binder binder}.
* @return a injection manager with all the bindings.
*/
public static InjectionManager createInjectionManager(Binder binder) {
InjectionManagerFactory injectionManagerFactory = lookupInjectionManagerFactory();
InjectionManager injectionManager = injectionManagerFactory.create();
injectionManager.register(binder);
return injectionManager;
}
/**
* Creates an unnamed, parented {@link InjectionManager}. In case the {@code parent} injection manager is not specified, the
* locator will not be parented.
*
* @param parent The parent of this injection manager. Services can be found in the parent (and all grand-parents). May be
* {@code null}. An underlying DI provider checks whether the parent is in a proper type.
* @return an injection manager with all the bindings.
*/
public static InjectionManager createInjectionManager(Object parent) {
return lookupInjectionManagerFactory().create(parent);
}
private static InjectionManagerFactory lookupInjectionManagerFactory() {
Iterator<InjectionManagerFactory> iterator = ServiceFinder.find(InjectionManagerFactory.class).iterator();
if (iterator.hasNext()) {
return iterator.next();
} else {
throw new IllegalStateException(LocalizationMessages.INJECTION_MANAGER_FACTORY_NOT_FOUND());
}
}
/**
* Get the class by contract or create and inject a new instance.
*
* @param <T> instance type.
* @param injectionManager DI injection manager.
* @param clazz class of the instance to be provider.
* @return instance of the class either provided as a service or created and injected by HK2.
*/
public static <T> T getOrCreate(InjectionManager injectionManager, final Class<T> clazz) {
try {
final T component = injectionManager.getInstance(clazz);
return component == null ? injectionManager.createAndInitialize(clazz) : component;
} catch (final RuntimeException e) {
// Look for WebApplicationException and return it if found. MultiException is thrown when *Param field is
// annotated and value cannot be provided (for example fromString(String) method can throw unchecked
// exception.
//
// see InvalidParamTest
// see JERSEY-1117
Throwable throwable = e.getCause();
if (throwable != null && WebApplicationException.class.isAssignableFrom(throwable.getClass())) {
throw (WebApplicationException) throwable;
}
throw e;
}
}
}