| /* |
| * 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.base.Preconditions; |
| 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; |
| |
| /** |
| * Produces construction proxies that invoke the class constructor. |
| * |
| * @author crazybob@google.com (Bob Lee) |
| */ |
| final class DefaultConstructionProxyFactory<T> implements ConstructionProxyFactory<T> { |
| |
| 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<T> create() { |
| @SuppressWarnings("unchecked") // the injection point is for a constructor of T |
| final Constructor<T> constructor = (Constructor<T>) injectionPoint.getMember(); |
| |
| /*if[AOP]*/ |
| try { |
| net.sf.cglib.reflect.FastClass fc = BytecodeGen.newFastClassForMember(constructor); |
| if (fc != null) { |
| int index = fc.getIndex(constructor.getParameterTypes()); |
| // We could just fall back to reflection in this case but I believe this should actually |
| // be impossible. |
| Preconditions.checkArgument( |
| index >= 0, "Could not find constructor %s in fast class", constructor); |
| return new FastClassProxy<T>(injectionPoint, constructor, fc, index); |
| } |
| } catch (net.sf.cglib.core.CodeGenerationException e) { |
| /* fall-through */ |
| } |
| /*end[AOP]*/ |
| |
| return new ReflectiveProxy<T>(injectionPoint, constructor); |
| } |
| |
| /*if[AOP]*/ |
| /** A {@link ConstructionProxy} that uses FastClass to invoke the constructor. */ |
| private static final class FastClassProxy<T> implements ConstructionProxy<T> { |
| final InjectionPoint injectionPoint; |
| final Constructor<T> constructor; |
| final net.sf.cglib.reflect.FastClass fc; |
| final int index; |
| |
| private FastClassProxy( |
| InjectionPoint injectionPoint, |
| Constructor<T> constructor, |
| net.sf.cglib.reflect.FastClass fc, |
| int index) { |
| this.injectionPoint = injectionPoint; |
| this.constructor = constructor; |
| this.fc = fc; |
| this.index = index; |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public T newInstance(Object... arguments) throws InvocationTargetException { |
| // Use this method instead of FastConstructor to save a stack frame |
| return (T) fc.newInstance(index, arguments); |
| } |
| |
| @Override |
| public InjectionPoint getInjectionPoint() { |
| return injectionPoint; |
| } |
| |
| @Override |
| public Constructor<T> getConstructor() { |
| return constructor; |
| } |
| |
| @Override |
| public ImmutableMap<Method, List<org.aopalliance.intercept.MethodInterceptor>> |
| getMethodInterceptors() { |
| return ImmutableMap.of(); |
| } |
| } |
| /*end[AOP]*/ |
| |
| private static final class ReflectiveProxy<T> implements ConstructionProxy<T> { |
| final Constructor<T> constructor; |
| final InjectionPoint injectionPoint; |
| |
| ReflectiveProxy(InjectionPoint injectionPoint, Constructor<T> 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<T> getConstructor() { |
| return constructor; |
| } |
| |
| /*if[AOP]*/ |
| @Override |
| public ImmutableMap<Method, List<org.aopalliance.intercept.MethodInterceptor>> |
| getMethodInterceptors() { |
| return ImmutableMap.of(); |
| } |
| /*end[AOP]*/ |
| } |
| } |