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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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package org.javimmutable.collections.common;

/**
 * Utility class containing static methods for implementing pre and post conditions.
 */
public final class Conditions
{
    private Conditions()
    {
        // prevent class being instantiated
    }

    public static void stopNull(Object a)
    {
        if (a == null) {
            throw new NullPointerException();
        }
    }

    public static void stopNull(Object a,
                                Object b)
    {
        if (a == null || b == null) {
            throw new NullPointerException();
        }
    }

    public static void stopNull(Object a,
                                Object b,
                                Object c)
    {
        if (a == null || b == null || c == null) {
            throw new NullPointerException();
        }
    }

    public static void stopNull(Object a,
                                Object b,
                                Object c,
                                Object d)
    {
        if (a == null || b == null || c == null || d == null) {
            throw new NullPointerException();
        }
    }
}