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Java example source code file (

This example Java source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

constructionproxyfactory, constructorinjector, constructorinjectorstore, errors, errorsexception, failablecache, immutablelist, membersinjectorimpl, override, proxyfactory, singleparameterinjector, suppresswarnings

The Java example source code

 * Copyright (C) 2009 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.


import static;


 * Constructor injectors by type.
 * @author (Jesse Wilson)
final class ConstructorInjectorStore {
  private final InjectorImpl injector;

  private final FailableCache<InjectionPoint, ConstructorInjector  cache
      = new FailableCache<InjectionPoint, ConstructorInjector () {
    protected ConstructorInjector<?> create(InjectionPoint constructorInjector, Errors errors)
        throws ErrorsException {
      return createConstructor(constructorInjector, errors);

  ConstructorInjectorStore(InjectorImpl injector) {
    this.injector = injector;

   * Returns a new complete constructor injector with injection listeners registered.
  public ConstructorInjector<?> get(InjectionPoint constructorInjector, Errors errors)
      throws ErrorsException {
    return cache.get(constructorInjector, errors);
   * Purges an injection point from the cache. Use this only if the cache is not actually valid and
   * needs to be purged. (See issue 319 and
   * ImplicitBindingTest#testCircularJitBindingsLeaveNoResidue and
   * #testInstancesRequestingProvidersForThemselvesWithChildInjectors for examples of when this is
   * necessary.)
   * Returns true if the injector for that point was stored in the cache, false otherwise.
  boolean remove(InjectionPoint ip) {
    return cache.remove(ip);

  private <T> ConstructorInjector createConstructor(InjectionPoint injectionPoint, Errors errors)
      throws ErrorsException {
    int numErrorsBefore = errors.size();

    SingleParameterInjector<?>[] constructorParameterInjectors
        = injector.getParametersInjectors(injectionPoint.getDependencies(), errors);

    @SuppressWarnings("unchecked") // the injector type agrees with the injection point type
    MembersInjectorImpl<T> membersInjector = (MembersInjectorImpl) injector.membersInjectorStore
        .get(injectionPoint.getDeclaringType(), errors);

    ImmutableList<MethodAspect> injectorAspects = injector.state.getMethodAspects();
    ImmutableList<MethodAspect> methodAspects = membersInjector.getAddedAspects().isEmpty()
        ? injectorAspects
        : ImmutableList.copyOf(concat(injectorAspects, membersInjector.getAddedAspects()));
    ConstructionProxyFactory<T> factory = new ProxyFactory(injectionPoint, methodAspects);
    ConstructionProxyFactory<T> factory = new DefaultConstructionProxyFactory(injectionPoint);


    return new ConstructorInjector<T>(membersInjector.getInjectionPoints(), factory.create(),
        constructorParameterInjectors, membersInjector);

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