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Java example source code file (ProvidedByInternalFactory.java)

This example Java source code file (ProvidedByInternalFactory.java) is included in the alvinalexander.com "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

bindingimpl, class, delayedinitialize, dependency, errorsexception, internalcontext, key, object, override, providedbyinternalfactory, provider, providerinternalfactory, runtimeexception

The ProvidedByInternalFactory.java Java example source code

 * Copyright (C) 2011 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.google.inject.internal;

import static com.google.common.base.Preconditions.checkState;

import com.google.inject.Key;
import com.google.inject.ProvidedBy;
import com.google.inject.internal.InjectorImpl.JitLimitation;
import com.google.inject.spi.Dependency;

import javax.inject.Provider;

 * An {@link InternalFactory} for {@literal @}{@link ProvidedBy} bindings.
 * @author sameb@google.com (Sam Berlin)
class ProvidedByInternalFactory<T> extends ProviderInternalFactory
    implements DelayedInitialize {
  private final Class<?> rawType;
  private final Class<? extends Provider providerType;
  private final Key<? extends Provider providerKey;
  private BindingImpl<? extends Provider providerBinding;
  private ProvisionListenerStackCallback<T> provisionCallback;
      Class<?> rawType,
      Class<? extends Provider providerType,
      Key<? extends Provider providerKey) {
    this.rawType = rawType;
    this.providerType = providerType; 
    this.providerKey = providerKey;
  void setProvisionListenerCallback(ProvisionListenerStackCallback<T> listener) {
    provisionCallback = listener;
  public void initialize(InjectorImpl injector, Errors errors) throws ErrorsException {
    providerBinding =
        injector.getBindingOrThrow(providerKey, errors, JitLimitation.NEW_OR_EXISTING_JIT);

  public T get(Errors errors, InternalContext context, Dependency dependency, boolean linked)
      throws ErrorsException {
    checkState(providerBinding != null, "not initialized");
    context.pushState(providerKey, providerBinding.getSource());
    try {
      errors = errors.withSource(providerKey);
      Provider<? extends T> provider = providerBinding.getInternalFactory().get(
          errors, context, dependency, true);
      return circularGet(provider, errors, context, dependency, provisionCallback);
    } finally {
  protected T provision(javax.inject.Provider<? extends T> provider, Errors errors,
      Dependency<?> dependency, ConstructionContext constructionContext)
      throws ErrorsException {
    try {
      Object o = super.provision(provider, errors, dependency, constructionContext);
      if (o != null && !rawType.isInstance(o)) {
        throw errors.subtypeNotProvided(providerType, rawType).toException();
      @SuppressWarnings("unchecked") // protected by isInstance() check above
      T t = (T) o;
      return t;
    } catch (RuntimeException e) {
      throw errors.errorInProvider(e).toException();

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