import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import org.jspecify.annotations.Nullable;

/**
 * An {@link InputStream} that concatenates multiple substreams. At most one stream will be open at
 * a time.
 *
 * @author Chris Nokleberg
 * @since 1.0
 */
@J2ktIncompatible
@GwtIncompatible
final class MultiInputStream extends InputStream {

	subSingle    map[subHandlerID]SingleHandlerFn
	subStateless map[subHandlerID]*StatelessHandler
	subStreams   map[subHandlerID]*StreamHandler
}

func (h *handlers) init() {
	h.subSingle = make(map[subHandlerID]SingleHandlerFn)
	h.subStateless = make(map[subHandlerID]*StatelessHandler)
	h.subStreams = make(map[subHandlerID]*StreamHandler)
}

func (h *handlers) hasAny(id HandlerID) bool {
	if !id.valid() {

		return nil, ErrUnknownHandler
	}
	if c.State() != StateConnected {
		return nil, ErrDisconnected
	}
	handler := c.handlers.subStreams[makeZeroSubHandlerID(h)]
	if handler == nil {
		if debugPrint {
			fmt.Println("want", makeZeroSubHandlerID(h), c.route, "got", c.handlers.subStreams)
		}
		return nil, ErrUnknownHandler
	}

	var requests chan []byte
	var responses chan Response
	if handler.InCapacity > 0 {

                return;
            }
            final FacetQueryView facetQueryView = new FacetQueryView();
            facetQueryView.setTitle(values[0]);
            split(values[1], "\t").of(subStream -> subStream.map(String::trim).filter(StringUtil::isNotEmpty).forEach(v -> {
                final String[] facet = StringUtils.split(v, "=", 2);
                if (facet.length == 2) {