| /** |
| * Copyright (C) 2008 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.spi.Dependency; |
| |
| /** |
| * Resolves a single parameter, to be used in a constructor or method invocation. |
| */ |
| final class SingleParameterInjector<T> { |
| private static final Object[] NO_ARGUMENTS = {}; |
| |
| private final Dependency<T> dependency; |
| private final InternalFactory<? extends T> factory; |
| |
| SingleParameterInjector(Dependency<T> dependency, InternalFactory<? extends T> factory) { |
| this.dependency = dependency; |
| this.factory = factory; |
| } |
| |
| private T inject(Errors errors, InternalContext context) throws ErrorsException { |
| Dependency previous = context.setDependency(dependency); |
| try { |
| return factory.get(errors.withSource(dependency), context, dependency, false); |
| } finally { |
| context.setDependency(previous); |
| } |
| } |
| |
| /** |
| * Returns an array of parameter values. |
| */ |
| static Object[] getAll(Errors errors, InternalContext context, |
| SingleParameterInjector<?>[] parameterInjectors) throws ErrorsException { |
| if (parameterInjectors == null) { |
| return NO_ARGUMENTS; |
| } |
| |
| int numErrorsBefore = errors.size(); |
| |
| int size = parameterInjectors.length; |
| Object[] parameters = new Object[size]; |
| |
| // optimization: use manual for/each to save allocating an iterator here |
| for (int i = 0; i < size; i++) { |
| SingleParameterInjector<?> parameterInjector = parameterInjectors[i]; |
| try { |
| parameters[i] = parameterInjector.inject(errors, context); |
| } catch (ErrorsException e) { |
| errors.merge(e.getErrors()); |
| } |
| } |
| |
| errors.throwIfNewErrors(numErrorsBefore); |
| return parameters; |
| } |
| } |