import net.pterodactylus.sonitus.data.Source;
import com.google.common.base.Preconditions;
/**
* Basic {@link ExternalFilter} implementation that verifies that the connected
import net.pterodactylus.sonitus.data.Source;
import com.google.common.base.Preconditions;
/**
* Basic {@link ExternalFilter} implementation that verifies that the connected