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package hydra.compute;

import hydra.core.Unit;

import java.util.function.Function;

/**
 * A convenience class for stateless adapters; we use Hydra's Unit as the state type.
 * Note: using Java's Void is problematic because of the interaction of Optional with null values.
 */
public class StatelessAdapter extends Adapter {
    public StatelessAdapter(boolean isLossy, T1 source, T2 target, Coder coder) {
        super(isLossy, source, target, coder);
    }

    /**
     * Construct a stateless adapter.
     */
    public static  StatelessAdapter of(boolean isLossy,
                                                                       T1 source,
                                                                       T2 target,
                                                                       Coder coder) {
        return new StatelessAdapter(isLossy, source, target, coder);
    }

    /**
     * Construct a unidirectional adapter; encoding follows the provided function, while decoding will fail gracefully.
     */
    public static  StatelessAdapter unidirectional(
            T1 source, T2 target, Function> encode) {
        return StatelessAdapter.of(true, source, target, StatelessCoder.unidirectional(encode));
    }
}