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package org.reactfx.value;

import java.util.function.Consumer;

import org.reactfx.SuspendableBase;
import org.reactfx.util.AccumulatorSize;
import org.reactfx.util.NotificationAccumulator;

class SuspendableValWrapper
extends SuspendableBase, T, T>
implements SuspendableVal, ProperVal {
    private final Val delegate;

    protected SuspendableValWrapper(Val obs) {
        super(
                obs.invalidations(),
                NotificationAccumulator.retainOldestValNotifications());
        this.delegate = obs;
    }

    @Override
    public T getValue() {
        return delegate.getValue();
    }

    @Override
    protected AccumulatorSize sizeOf(T accum) {
        return AccumulatorSize.ONE;
    }

    @Override
    protected T headOf(T accum) {
        return accum;
    }

    @Override
    protected T tailOf(T accum) {
        throw new UnsupportedOperationException("Cannot take a tail of a single value");
    }

}