NoopIdleNotificationCallbackIdleNotifierProvider.java

/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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 androidx.test.espresso.base;

import androidx.test.espresso.base.IdlingResourceRegistry.IdleNotificationCallback;
import javax.inject.Provider;

/**
 * A default implementation of an IdleNotifier provider which is always idle and invokes a {@link
 * IdleNotificationCallback} on transition to idle.
 */
final class NoopIdleNotificationCallbackIdleNotifierProvider
    implements Provider<IdleNotifier<IdleNotificationCallback>> {

  @Override
  public NoopIdleNotificationCallbackIdleNotifier get() {
    return new NoopIdleNotificationCallbackIdleNotifier();
  }

  private static class NoopIdleNotificationCallbackIdleNotifier
      implements IdleNotifier<IdleNotificationCallback> {

    @Override
    public boolean isIdleNow() {
      return true;
    }

    @Override
    public void registerNotificationCallback(IdleNotificationCallback cb) {
      cb.allResourcesIdle();
    }

    @Override
    public void cancelCallback() {}
  }
}