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HK2 InjectionManager implementation
/*
* Copyright (c) 2017, 2020 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 org.glassfish.jersey.inject.hk2;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.Set;
import java.util.function.Supplier;
import jakarta.inject.Inject;
import jakarta.inject.Named;
import jakarta.inject.Singleton;
import org.glassfish.jersey.internal.Errors;
import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.internal.inject.InjectionResolver;
import org.glassfish.jersey.internal.util.collection.ImmutableCollectors;
import org.glassfish.jersey.internal.util.collection.LazyValue;
import org.glassfish.jersey.internal.util.collection.Value;
import org.glassfish.jersey.internal.util.collection.Values;
import org.glassfish.hk2.api.ClassAnalyzer;
import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
/**
* Implementation of the {@link ClassAnalyzer} that supports selection
* of the constructor with largest number of parameters as defined in
* and required by JAX-RS specification.
*
* @author John Wells (john.wells at oracle.com)
* @author Marek Potociar
*/
@Singleton
@Named(JerseyClassAnalyzer.NAME)
public final class JerseyClassAnalyzer implements ClassAnalyzer {
/**
* Name of the analyzer service.
*/
public static final String NAME = "JerseyClassAnalyzer";
/**
* Binder for the JAX-RS compliant class analyzer implementation.
*/
public static final class Binder extends AbstractBinder {
private final ServiceLocator serviceLocator;
/**
* Constructor for {@code JerseyClassAnalyzer}.
*
* @param serviceLocator current injection manager.
*/
public Binder(ServiceLocator serviceLocator) {
this.serviceLocator = serviceLocator;
}
@Override
protected void configure() {
ClassAnalyzer defaultAnalyzer =
serviceLocator.getService(ClassAnalyzer.class, ClassAnalyzer.DEFAULT_IMPLEMENTATION_NAME);
Supplier> resolvers = () -> serviceLocator.getAllServices(InjectionResolver.class);
bind(new JerseyClassAnalyzer(defaultAnalyzer, resolvers))
.analyzeWith(ClassAnalyzer.DEFAULT_IMPLEMENTATION_NAME)
.named(JerseyClassAnalyzer.NAME)
.to(ClassAnalyzer.class);
}
}
private final ClassAnalyzer defaultAnalyzer;
private final LazyValue> resolverAnnotations;
/**
* Injection constructor.
*
* @param defaultAnalyzer default HK2 class analyzer.
* @param supplierResolvers configured injection resolvers.
*/
private JerseyClassAnalyzer(ClassAnalyzer defaultAnalyzer, Supplier> supplierResolvers) {
this.defaultAnalyzer = defaultAnalyzer;
Value> resolvers = () -> supplierResolvers.get().stream()
.filter(InjectionResolver::isConstructorParameterIndicator)
.map(InjectionResolver::getAnnotation)
.collect(ImmutableCollectors.toImmutableSet());
this.resolverAnnotations = Values.lazy(resolvers);
}
@SuppressWarnings("unchecked")
@Override
public Constructor getConstructor(final Class clazz) throws MultiException, NoSuchMethodException {
if (clazz.isLocalClass()) {
throw new NoSuchMethodException(LocalizationMessages.INJECTION_ERROR_LOCAL_CLASS_NOT_SUPPORTED(clazz.getName()));
}
if (clazz.isMemberClass() && !Modifier.isStatic(clazz.getModifiers())) {
throw new NoSuchMethodException(
LocalizationMessages.INJECTION_ERROR_NONSTATIC_MEMBER_CLASS_NOT_SUPPORTED(clazz.getName()));
}
final Constructor retVal;
try {
retVal = defaultAnalyzer.getConstructor(clazz);
final Class[] args = retVal.getParameterTypes();
if (args.length != 0) {
return retVal;
}
// Is zero length, but is it specifically marked?
final Inject i = retVal.getAnnotation(Inject.class);
if (i != null) {
return retVal;
}
// In this case, the default chose a zero-arg constructor since it could find no other
} catch (final NoSuchMethodException ignored) {
// In this case, the default failed because it found no constructor it could use
} catch (final MultiException me) {
if (me.getErrors().size() != 1 && !(me.getErrors().get(0) instanceof IllegalArgumentException)) {
throw me;
}
// Otherwise, the default failed because it found more than one constructor
}
// At this point, we simply need to find the constructor with the largest number of parameters
final Constructor[] constructors = AccessController.doPrivileged(
(PrivilegedAction[]>) clazz::getDeclaredConstructors);
Constructor selected = null;
int selectedSize = 0;
int maxParams = -1;
for (final Constructor constructor : constructors) {
final Class[] params = constructor.getParameterTypes();
if (params.length >= maxParams && isCompatible(constructor)) {
if (params.length > maxParams) {
maxParams = params.length;
selectedSize = 0;
}
selected = constructor;
selectedSize++;
}
}
if (selectedSize == 0) {
throw new NoSuchMethodException(LocalizationMessages.INJECTION_ERROR_SUITABLE_CONSTRUCTOR_NOT_FOUND(clazz.getName()));
}
if (selectedSize > 1) {
// Found {0} constructors with {1} parameters in {2} class. Selecting the first found constructor: {3}
Errors.warning(clazz, LocalizationMessages.MULTIPLE_MATCHING_CONSTRUCTORS_FOUND(
selectedSize, maxParams, clazz.getName(), selected.toGenericString()));
}
return (Constructor) selected;
}
@SuppressWarnings("MagicConstant")
private boolean isCompatible(final Constructor constructor) {
if (constructor.getAnnotation(Inject.class) != null) {
// JSR-330 applicable
return true;
}
final int paramSize = constructor.getParameterTypes().length;
if (paramSize != 0 && resolverAnnotations.get().isEmpty()) {
return false;
}
if (!Modifier.isPublic(constructor.getModifiers())) {
// return true for a default constructor, return false otherwise.
return paramSize == 0
&& (constructor.getDeclaringClass().getModifiers()
& (Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE)) == constructor.getModifiers();
}
for (final Annotation[] paramAnnotations : constructor.getParameterAnnotations()) {
boolean found = false;
for (final Annotation paramAnnotation : paramAnnotations) {
if (resolverAnnotations.get().contains(paramAnnotation.annotationType())) {
found = true;
break;
}
}
if (!found) {
return false;
}
}
return true;
}
@Override
public Set getInitializerMethods(final Class clazz) throws MultiException {
return defaultAnalyzer.getInitializerMethods(clazz);
}
@Override
public Set getFields(final Class clazz) throws MultiException {
return defaultAnalyzer.getFields(clazz);
}
@Override
public Method getPostConstructMethod(final Class clazz) throws MultiException {
return defaultAnalyzer.getPostConstructMethod(clazz);
}
@Override
public Method getPreDestroyMethod(final Class clazz) throws MultiException {
return defaultAnalyzer.getPreDestroyMethod(clazz);
}
}
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