com.google.inject.internal.DefaultConstructionProxyFactory Maven / Gradle / Ivy
/*
* Copyright (C) 2006 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.inject.internal;
import com.google.common.collect.ImmutableMap;
import com.google.inject.spi.InjectionPoint;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.List;
import java.util.function.BiFunction;
import org.aopalliance.intercept.MethodInterceptor;
/**
* Produces construction proxies that invoke the class constructor.
*
* @author [email protected] (Bob Lee)
*/
final class DefaultConstructionProxyFactory implements ConstructionProxyFactory {
private final InjectionPoint injectionPoint;
/** @param injectionPoint an injection point whose member is a constructor of {@code T}. */
DefaultConstructionProxyFactory(InjectionPoint injectionPoint) {
this.injectionPoint = injectionPoint;
}
@Override
public ConstructionProxy create() {
@SuppressWarnings("unchecked") // the injection point is for a constructor of T
final Constructor constructor = (Constructor) injectionPoint.getMember();
if (InternalFlags.isBytecodeGenEnabled()) {
try {
BiFunction fastConstructor =
BytecodeGen.fastConstructor(constructor);
if (fastConstructor != null) {
return new FastClassProxy(injectionPoint, constructor, fastConstructor);
}
} catch (Exception | LinkageError e) {
/* fall-through */
}
}
return new ReflectiveProxy(injectionPoint, constructor);
}
/** A {@link ConstructionProxy} that uses bytecode generation to invoke the constructor. */
private static final class FastClassProxy implements ConstructionProxy {
final InjectionPoint injectionPoint;
final Constructor constructor;
final BiFunction fastConstructor;
FastClassProxy(
InjectionPoint injectionPoint,
Constructor constructor,
BiFunction fastConstructor) {
this.injectionPoint = injectionPoint;
this.constructor = constructor;
this.fastConstructor = fastConstructor;
}
@Override
@SuppressWarnings("unchecked")
public T newInstance(Object... arguments) throws InvocationTargetException {
try {
return (T) fastConstructor.apply(null, arguments);
} catch (Throwable e) {
throw new InvocationTargetException(e); // match JDK reflection behaviour
}
}
@Override
public InjectionPoint getInjectionPoint() {
return injectionPoint;
}
@Override
public Constructor getConstructor() {
return constructor;
}
@Override
public ImmutableMap> getMethodInterceptors() {
return ImmutableMap.of();
}
}
private static final class ReflectiveProxy implements ConstructionProxy {
final Constructor constructor;
final InjectionPoint injectionPoint;
ReflectiveProxy(InjectionPoint injectionPoint, Constructor constructor) {
if (!Modifier.isPublic(constructor.getDeclaringClass().getModifiers())
|| !Modifier.isPublic(constructor.getModifiers())) {
constructor.setAccessible(true);
}
this.injectionPoint = injectionPoint;
this.constructor = constructor;
}
@Override
public T newInstance(Object... arguments) throws InvocationTargetException {
try {
return constructor.newInstance(arguments);
} catch (InstantiationException e) {
throw new AssertionError(e); // shouldn't happen, we know this is a concrete type
} catch (IllegalAccessException e) {
throw new AssertionError(e); // a security manager is blocking us, we're hosed
}
}
@Override
public InjectionPoint getInjectionPoint() {
return injectionPoint;
}
@Override
public Constructor getConstructor() {
return constructor;
}
@Override
public ImmutableMap> getMethodInterceptors() {
return ImmutableMap.of();
}
}
}