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Java example source code file (InternalFactoryToProviderAdapter.java)

This example Java source code file (InternalFactoryToProviderAdapter.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.

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Java - Java tags/keywords

dependency, errorsexception, internalcontext, internalfactorytoprovideradapter, object, override, runtimeexception, string

The InternalFactoryToProviderAdapter.java Java example source code

 * 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,
 * 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.checkNotNull;

import com.google.inject.Provider;
import com.google.inject.spi.Dependency;

 * @author crazybob@google.com (Bob Lee)
final class InternalFactoryToProviderAdapter<T> implements InternalFactory {

  private final Provider<? extends T> provider;
  private final Object source;

  public InternalFactoryToProviderAdapter(Provider<? extends T> provider, Object source) {
    this.provider = checkNotNull(provider, "provider");
    this.source = checkNotNull(source, "source");

  public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked)
      throws ErrorsException {
    // TODO(sameb): Does this need to push state into the context?
    try {
      return errors.checkForNull(provider.get(), source, dependency);
    } catch (RuntimeException userException) {
      throw errors.withSource(source).errorInProvider(userException).toException();

  @Override public String toString() {
    return provider.toString();

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