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package net.yudichev.jiotty.common.lang;

import javax.annotation.Nullable;
import java.util.function.BiConsumer;

import static com.google.common.base.Preconditions.checkNotNull;

public final class DeduplicatingBiConsumer implements BiConsumer {
    private final BiConsumer delegate;
    @Nullable
    private T lastValue1;
    @Nullable
    private U lastValue2;

    public DeduplicatingBiConsumer(BiConsumer delegate) {
        this.delegate = checkNotNull(delegate);
    }

    @Override
    public void accept(T t, U u) {
        if (!t.equals(lastValue1) || !u.equals(lastValue2)) {
            delegate.accept(t, u);
            lastValue1 = t;
            lastValue2 = u;
        }
    }
}