| /** |
| * 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.inject.internal.ProvisionListenerStackCallback.ProvisionCallback; |
| import com.google.inject.internal.util.ImmutableSet; |
| import com.google.inject.spi.InjectionPoint; |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.Set; |
| |
| /** |
| * Creates instances using an injectable constructor. After construction, all injectable fields and |
| * methods are injected. |
| * |
| * @author crazybob@google.com (Bob Lee) |
| */ |
| final class ConstructorInjector<T> { |
| |
| private final ImmutableSet<InjectionPoint> injectableMembers; |
| private final SingleParameterInjector<?>[] parameterInjectors; |
| private final ConstructionProxy<T> constructionProxy; |
| private final MembersInjectorImpl<T> membersInjector; |
| |
| ConstructorInjector(Set<InjectionPoint> injectableMembers, |
| ConstructionProxy<T> constructionProxy, |
| SingleParameterInjector<?>[] parameterInjectors, |
| MembersInjectorImpl<T> membersInjector) { |
| this.injectableMembers = ImmutableSet.copyOf(injectableMembers); |
| this.constructionProxy = constructionProxy; |
| this.parameterInjectors = parameterInjectors; |
| this.membersInjector = membersInjector; |
| } |
| |
| public ImmutableSet<InjectionPoint> getInjectableMembers() { |
| return injectableMembers; |
| } |
| |
| ConstructionProxy<T> getConstructionProxy() { |
| return constructionProxy; |
| } |
| |
| /** |
| * Construct an instance. Returns {@code Object} instead of {@code T} because |
| * it may return a proxy. |
| */ |
| Object construct(final Errors errors, final InternalContext context, |
| Class<?> expectedType, boolean allowProxy, |
| ProvisionListenerStackCallback<T> provisionCallback) |
| throws ErrorsException { |
| final ConstructionContext<T> constructionContext = context.getConstructionContext(this); |
| |
| // We have a circular reference between constructors. Return a proxy. |
| if (constructionContext.isConstructing()) { |
| if(!allowProxy) { |
| throw errors.circularProxiesDisabled(expectedType).toException(); |
| } else { |
| // TODO (crazybob): if we can't proxy this object, can we proxy the other object? |
| return constructionContext.createProxy(errors, expectedType); |
| } |
| } |
| |
| // If we're re-entering this factory while injecting fields or methods, |
| // return the same instance. This prevents infinite loops. |
| T t = constructionContext.getCurrentReference(); |
| if (t != null) { |
| return t; |
| } |
| |
| try { |
| // Optimization: Don't go through the callback stack if we have no listeners. |
| if (!provisionCallback.hasListeners()) { |
| return provision(errors, context, constructionContext); |
| } else { |
| return provisionCallback.provision(errors, context, new ProvisionCallback<T>() { |
| public T call() throws ErrorsException { |
| return provision(errors, context, constructionContext); |
| } |
| }); |
| } |
| } finally { |
| constructionContext.removeCurrentReference(); |
| } |
| } |
| |
| /** Provisions a new T. */ |
| private T provision(Errors errors, InternalContext context, |
| ConstructionContext<T> constructionContext) throws ErrorsException { |
| try { |
| constructionContext.startConstruction(); |
| T t; |
| try { |
| Object[] parameters = SingleParameterInjector.getAll(errors, context, parameterInjectors); |
| t = constructionProxy.newInstance(parameters); |
| constructionContext.setProxyDelegates(t); |
| } finally { |
| constructionContext.finishConstruction(); |
| } |
| |
| // Store reference. If an injector re-enters this factory, they'll get the same reference. |
| constructionContext.setCurrentReference(t); |
| |
| membersInjector.injectMembers(t, errors, context, false); |
| membersInjector.notifyListeners(t, errors); |
| |
| return t; |
| } catch (InvocationTargetException userException) { |
| Throwable cause = userException.getCause() != null |
| ? userException.getCause() |
| : userException; |
| throw errors.withSource(constructionProxy.getInjectionPoint()) |
| .errorInjectingConstructor(cause).toException(); |
| } |
| } |
| } |