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Reactive event streams for JavaFX

There is a newer version: 2.0-M5

package org.reactfx;

import org.reactfx.util.Either;
import org.reactfx.util.Tuple2;
import org.reactfx.util.Tuple3;

class EmitOnEachStream extends LazilyBoundStream {
    private final EventStream source;
    private final EventStream impulse;

    private boolean hasValue = false;
    private T value = null;

    public EmitOnEachStream(EventStream source, EventStream impulse) {
        this.source = source;
        this.impulse = impulse;
    }

    @Override
    protected Subscription subscribeToInputs() {
        Subscription s1 = subscribeTo(source, v -> {
            hasValue = true;
            value = v;
        });

        Subscription s2 = subscribeTo(impulse, i -> {
            if(hasValue) {
                emit(value);
            }
        });

        return s1.and(s2);
    }
}

class EmitOnEachBiStream
extends EmitOnEachStream>
implements PoorMansBiStream {

    public EmitOnEachBiStream(
            EventStream> source,
            EventStream impulse) {
        super(source, impulse);
    }
}

class EmitOnEachTriStream
extends EmitOnEachStream>
implements PoorMansTriStream {

    public EmitOnEachTriStream(
            EventStream> source,
            EventStream impulse) {
        super(source, impulse);
    }
}

@Deprecated
class EmitOnEachEitherStream
extends EmitOnEachStream>
implements EitherEventStream {

    public EmitOnEachEitherStream(
            EventStream> source,
            EventStream impulse) {
        super(source, impulse);
    }
}