athenz.shade.zts.org.glassfish.hk2.utilities.GreedyResolver Maven / Gradle / Ivy
/*
* Copyright (c) 2017, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.utilities;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import athenz.shade.zts.athenz.shade.zts.javax.inject.Inject;
import athenz.shade.zts.athenz.shade.zts.javax.inject.Singleton;
import athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.DescriptorVisibility;
import athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.Injectee;
import athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.JustInTimeInjectionResolver;
import athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.ServiceLocator;
import athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.Visibility;
/**
* This is a greedy resolve that will add in any class
* that has failed to be resolved. It uses {@link ServiceLocatorUtilities#addClasses(athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.ServiceLocator, Class...)}
* in order to add classes, and hence will use the default
* class analyzer to discover injection points and constructors.
*
* If the injected class is an interface the interface may use
* the {@link GreedyDefaultImplementation} in order to specify
* the class that should be used when another implementation
* of this interface cannot be found.
*
* WARNING: This resolve should be used with care as it
* could cause unexpected class files to be instantiated
* by hk2
*
* @author jwells
*
*/
@Singleton
@Visibility(DescriptorVisibility.LOCAL)
public class GreedyResolver implements JustInTimeInjectionResolver {
private final ServiceLocator locator;
@Inject
private GreedyResolver(ServiceLocator locator) {
this.locator = locator;
}
/* (non-Javadoc)
* @see athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.JustInTimeInjectionResolver#justInTimeResolution(athenz.shade.zts.athenz.shade.zts.org.glassfish.hk2.api.Injectee)
*/
@Override
public boolean justInTimeResolution(Injectee failedInjectionPoint) {
Type type = failedInjectionPoint.getRequiredType();
if (type == null) return false;
Class clazzToAdd = null;
if (type instanceof Class) {
clazzToAdd = (Class) type;
}
else if (type instanceof ParameterizedType) {
Type rawType = ((ParameterizedType) type).getRawType();
if (rawType instanceof Class) {
clazzToAdd = (Class) rawType;
}
}
if (clazzToAdd == null) return false;
if (clazzToAdd.isInterface()) {
GreedyDefaultImplementation gdi = clazzToAdd.getAnnotation(GreedyDefaultImplementation.class);
if (gdi != null) {
clazzToAdd = gdi.value();
}
else {
return false;
}
}
ServiceLocatorUtilities.addClasses(locator, clazzToAdd);
return true;
}
}