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package it.niedermann.owncloud.notes.persistence;
import androidx.annotation.Nullable;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.Observer;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
public class NotesDatabaseTestUtil {
private static long currentLong = 1;
private NotesDatabaseTestUtil() {
// Util class
}
/**
* @see <a href="https://gist.github.com/JoseAlcerreca/1e9ee05dcdd6a6a6fa1cbfc125559bba">Source</a>
*/
public static <T> T getOrAwaitValue(final LiveData<T> liveData) throws InterruptedException {
final Object[] data = new Object[1];
final CountDownLatch latch = new CountDownLatch(1);
Observer<T> observer = new Observer<T>() {
@Override
public void onChanged(@Nullable T o) {
data[0] = o;
latch.countDown();
liveData.removeObserver(this);
}
};
liveData.observeForever(observer);
// Don't wait indefinitely if the LiveData is not set.
if (!latch.await(2, TimeUnit.SECONDS)) {
throw new RuntimeException("LiveData value was never set.");
}
//noinspection unchecked
return (T) data[0];
}
public static String randomString(int length) {
final int leftLimit = 48; // numeral '0'
final int rightLimit = 122; // letter 'z'
return new Random().ints(leftLimit, rightLimit + 1)
.filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97))
.limit(length)
.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
.toString();
}
public static long uniqueLong() {
return currentLong++;
}
}
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