java/com/android/voicemail/impl/Assert.java

/*
 * Copyright (C) 2016 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 com.android.voicemail.impl;

import android.os.Looper;

/** Assertions which will result in program termination. */
public class Assert {

  private static Boolean isMainThreadForTest;

  public static void isTrue(boolean condition) {
    if (!condition) {
      throw new AssertionError("Expected condition to be true");
    }
  }

  public static void isMainThread() {
    if (isMainThreadForTest != null) {
      isTrue(isMainThreadForTest);
      return;
    }
    isTrue(Looper.getMainLooper().equals(Looper.myLooper()));
  }

  public static void isNotMainThread() {
    if (isMainThreadForTest != null) {
      isTrue(!isMainThreadForTest);
      return;
    }
    isTrue(!Looper.getMainLooper().equals(Looper.myLooper()));
  }

  public static void fail() {
    throw new AssertionError("Fail");
  }

  /** Override the main thread status for tests. Set to null to revert to normal behavior */
  @NeededForTesting
  public static void setIsMainThreadForTesting(Boolean isMainThread) {
    isMainThreadForTest = isMainThread;
  }
}