public static <T> int linearSearch(List<? extends T> list, Comparator<T> comparator, T key, int initialGuess) {
        int guess = initialGuess;
        if (guess >= list.size()) {
            guess = list.size()-1;
        }
        int comparison = comparator.compare(list.get(guess), key);
        if (comparison == 0) {
            return guess;
        }
        if (comparison < 0) {
            guess++;
            while (guess < list.size()) {
                comparison = comparator.compare(list.get(guess), key);
                if (comparison == 0) {
                    return guess;
                }
                if (comparison > 0) {
                    return -(guess+1);
                }
                guess++;
            }
            return -(list.size()+1);
        } else {
            guess--;
            while (guess >= 0) {
                comparison = comparator.compare(list.get(guess), key);
                if (comparison == 0) {
                    return guess;
                }
                if (comparison < 0) {
                    return -(guess+2);
                }
                guess--;
            }
            return -1;
        }
    }
@Test
    public void testLinearSearch() {
        List<Integer> list = Lists.newArrayList(0, 1, 3, 4);

        doTest(list, 5, 10);
        doTest(list, 5, 4);
        doTest(list, 5, 3);
        doTest(list, 5, 2);
        doTest(list, 5, 1);
        doTest(list, 5, 0);

        doTest(list, 4, 10);
        doTest(list, 4, 4);
        doTest(list, 4, 3);
        doTest(list, 4, 2);
        doTest(list, 4, 1);
        doTest(list, 4, 0);

        doTest(list, 3, 10);
        doTest(list, 3, 4);
        doTest(list, 3, 3);
        doTest(list, 3, 2);
        doTest(list, 3, 1);
        doTest(list, 3, 0);

        doTest(list, 2, 10);
        doTest(list, 2, 4);
        doTest(list, 2, 3);
        doTest(list, 2, 2);
        doTest(list, 2, 1);
        doTest(list, 2, 0);

        doTest(list, 1, 10);
        doTest(list, 1, 4);
        doTest(list, 1, 3);
        doTest(list, 1, 2);
        doTest(list, 1, 1);
        doTest(list, 1, 0);

        doTest(list, 0, 10);
        doTest(list, 0, 4);
        doTest(list, 0, 3);
        doTest(list, 0, 2);
        doTest(list, 0, 1);
        doTest(list, 0, 0);

        doTest(list, -1, 10);
        doTest(list, -1, 4);
        doTest(list, -1, 3);
        doTest(list, -1, 2);
        doTest(list, -1, 1);
        doTest(list, -1, 0);
    }