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rx-java Observables for jdbc

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package com.github.davidmoten.rx.jdbc;

/**
 * Utility methods to checking conditions.
 */
final class Conditions {

    /**
     * Private constructor to prevent instantiation.
     */
    private Conditions() {
        // prevent instantiation
    }

    /**
     * If and only if parameter is false throw a {@link RuntimeException}.
     * 
     * @param b
     */
    static void checkTrue(boolean b) {
        if (!b)
            throw new RuntimeException("check failed");
    }

    /**
     * If and only if parameter is true throw a {@link RuntimeException}.
     * 
     * @param b
     */
    static void checkFalse(boolean b) {
        checkTrue(!b);
    }

    /**
     * Throws a {@link NullPointerException} if argument is null.
     * 
     * @param obj
     */
    static void checkNotNull(Object obj) {
        if (obj == null)
            throw new NullPointerException("argument cannot be null");
    }

}