BaseAdWordsServices.java

// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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.api.ads.adwords.lib.factory;

import com.google.api.ads.adwords.lib.client.AdWordsServiceClient;
import com.google.api.ads.adwords.lib.client.AdWordsServiceDescriptor;
import com.google.api.ads.adwords.lib.client.AdWordsSession;
import com.google.api.ads.adwords.lib.utils.SessionUtility;
import com.google.api.ads.common.lib.factory.BaseServices;
import com.google.common.base.Preconditions;
import com.google.inject.Injector;

/** Base for a utility class which creates AdWords service clients. */
public abstract class BaseAdWordsServices
    extends BaseServices<AdWordsServiceClient, AdWordsSession, AdWordsServiceDescriptor>
    implements AdWordsServicesInterface {

  final Injector injector;

  /** @param injector an injector which binds all the necessary classes */
  protected BaseAdWordsServices(Injector injector) {
    super(new AdWordsServiceClientFactory(injector));
    this.injector = injector;
  }

  @Override
  public <UtilityT> UtilityT getUtility(AdWordsSession session, Class<UtilityT> utilityClass) {
    Preconditions.checkNotNull(session, "Null session");
    Preconditions.checkNotNull(utilityClass, "Null utility class");
    if (utilityClass.getAnnotation(SessionUtility.class) == null) {
      throw new IllegalArgumentException(
          utilityClass + " is not annotated with " + SessionUtility.class);
    }
    Injector childInjector = injector.createChildInjector(new AdWordsSessionModule(session));
    return childInjector.getInstance(utilityClass);
  }

  /** Returns a new {@link DependencyBootstrapper} bound to this object's injector. */
  protected DependencyBootstrapper createBootstrapper() {
    return injector.getInstance(DependencyBootstrapper.class);
  }
}