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Java example source code file (DeferredLookups.java)

This example Java source code file (DeferredLookups.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

deferredlookups, injectorimpl, list, membersinjectorlookup, providerlookup, util

The DeferredLookups.java 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
 *
 * 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.common.collect.Lists;
import com.google.inject.Key;
import com.google.inject.MembersInjector;
import com.google.inject.Provider;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.Element;
import com.google.inject.spi.MembersInjectorLookup;
import com.google.inject.spi.ProviderLookup;

import java.util.List;

/**
 * Returns providers and members injectors that haven't yet been initialized. As a part of injector
 * creation it's necessary to {@link #initialize initialize} these lookups.
 *
 * @author jessewilson@google.com (Jesse Wilson)
 */
final class DeferredLookups implements Lookups {
  private final InjectorImpl injector;
  private final List<Element> lookups = Lists.newArrayList();

  DeferredLookups(InjectorImpl injector) {
    this.injector = injector;
  }

  /**
   * Initialize the specified lookups, either immediately or when the injector is created.
   */
  void initialize(Errors errors) {
    injector.lookups = injector;
    new LookupProcessor(errors).process(injector, lookups);
  }

  public <T> Provider getProvider(Key key) {
    ProviderLookup<T> lookup = new ProviderLookup(key, key);
    lookups.add(lookup);
    return lookup.getProvider();
  }

  public <T> MembersInjector getMembersInjector(TypeLiteral type) {
    MembersInjectorLookup<T> lookup = new MembersInjectorLookup(type, type);
    lookups.add(lookup);
    return lookup.getMembersInjector();
  }
}

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