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Java example source code file (BoundProviderFactory.java)

This example Java source code file (BoundProviderFactory.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

boundproviderfactory, constructioncontext, creationlistener, dependency, errorsexception, injectorimpl, internalcontext, key, object, override, providerinternalfactory, provisionlistenerstackcallback, string

The BoundProviderFactory.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,
 * 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 static com.google.common.base.Preconditions.checkNotNull;

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

import javax.inject.Provider;

/**
 * Delegates to a custom factory which is also bound in the injector.
 */
final class BoundProviderFactory<T> extends ProviderInternalFactory implements CreationListener {

  private final ProvisionListenerStackCallback<T> provisionCallback;
  private final InjectorImpl injector;
  final Key<? extends javax.inject.Provider providerKey;
  private InternalFactory<? extends javax.inject.Provider providerFactory;

  BoundProviderFactory(
      InjectorImpl injector,
      Key<? extends javax.inject.Provider providerKey,
      Object source,
      ProvisionListenerStackCallback<T> provisionCallback) {
    super(source);
    this.provisionCallback = checkNotNull(provisionCallback, "provisionCallback");
    this.injector = injector;
    this.providerKey = providerKey;
  }

  public void notify(Errors errors) {
    try {
      providerFactory = injector.getInternalFactory(providerKey, errors.withSource(source), JitLimitation.NEW_OR_EXISTING_JIT);
    } catch (ErrorsException e) {
      errors.merge(e.getErrors());
    }
  }

  public T get(Errors errors, InternalContext context, Dependency<?> dependency, boolean linked)
      throws ErrorsException {
    context.pushState(providerKey, source);
    try {
      errors = errors.withSource(providerKey);
      javax.inject.Provider<? extends T> provider = providerFactory.get(errors, context, dependency, true);
      return circularGet(provider, errors, context, dependency, provisionCallback);
    } finally {
      context.popState();
    }
  }
  
  @Override
  protected T provision(Provider<? extends T> provider, Errors errors, Dependency dependency,
      ConstructionContext<T> constructionContext) throws ErrorsException {
    try {
      return super.provision(provider, errors, dependency, constructionContext);
    } catch(RuntimeException userException) {
      throw errors.errorInProvider(userException).toException();
    } 
  }

  @Override public String toString() {
    return providerKey.toString();
  }
}

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