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R2DBC driver for ClickHouse

There is a newer version: 0.7.1-patch1

package com.clickhouse.r2dbc;

import java.io.Serializable;
import java.util.Map.Entry;

/**
 * Immutable pair with two values: left and right.
 */
public class ClickHousePair implements Entry, Serializable {
    public static final ClickHousePair EMPTY = new ClickHousePair<>(null, null);

    @SuppressWarnings("unchecked")
    public static final  ClickHousePair of(L left, R right) {
        if (left == null && right == null) {
            return (ClickHousePair) EMPTY;
        }

        return new ClickHousePair<>(left, right);
    }

    private final L left;
    private final R right;

    public L getLeft() {
        return left;
    }

    public R getRight() {
        return right;
    }

    protected ClickHousePair(L left, R right) {
        this.left = left;
        this.right = right;
    }

    @Override
    public L getKey() {
        return left;
    }

    @Override
    public R getValue() {
        return right;
    }

    @Override
    public R setValue(R value) {
        throw new IllegalStateException("Cannot modify value");
    }
}