| /* |
| * 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 Object source; |
| |
| private final InternalFactory<? extends T> factory; |
| |
| SingleParameterInjector(Dependency<T> dependency, BindingImpl<? extends T> binding) { |
| this.dependency = dependency; |
| this.source = binding.getSource(); |
| this.factory = binding.getInternalFactory(); |
| } |
| |
| T inject(InternalContext context) throws InternalProvisionException { |
| Dependency<T> localDependency = dependency; |
| Dependency previous = context.pushDependency(localDependency, source); |
| |
| try { |
| return factory.get(context, localDependency, false); |
| } catch (InternalProvisionException ipe) { |
| throw ipe.addSource(localDependency); |
| } finally { |
| context.popStateAndSetDependency(previous); |
| |
| } |
| } |
| |
| // TODO(lukes): inline into callers to decrease stack depth |
| |
| /** Returns an array of parameter values. */ |
| static Object[] getAll(InternalContext context, SingleParameterInjector<?>[] parameterInjectors) |
| throws InternalProvisionException { |
| if (parameterInjectors == null) { |
| return NO_ARGUMENTS; |
| } |
| |
| 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++) { |
| parameters[i] = parameterInjectors[i].inject(context); |
| } |
| return parameters; |
| } |
| } |