caliper/src/main/java/com/google/caliper/platform/dalvik/DalvikModule.java

/*
 * Copyright (C) 2015 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.caliper.platform.dalvik;

import com.google.common.base.Optional;

import dagger.Module;
import dagger.Provides;

import javax.inject.Singleton;

/**
 * Provider of a {@link DalvikPlatform} instance.
 *
 * <p>The {@link DalvikPlatform} is optional as it is only available when running on Android.
 */
@Module
public final class DalvikModule {

  @Provides
  @Singleton
  public static Optional<DalvikPlatform> provideOptionalPlatform() {
    if (System.getProperty("java.specification.name").equals("Dalvik Core Library")) {
      return Optional.of(new DalvikPlatform());
    } else {
      return Optional.absent();
    }
  }
}