Examples of RandomIndexGenerator

programming5.code.RandomIndexGenerator
This class uses a java Random object to generate integers included in one or more given ranges. If the ranges are provided properly, the generator guarantees that every integer (index) belonging to the union of the ranges will have the same probability of being generated in each call to the getRandomIndex method. These integers can then, for example, be used to index subsets of an array or collection, while guaranteeing that no elements outside of the given index ranges will be selected. This implementation may save memory with respect to generating the desired index subset to then select a random element, if the ranges are large. @author Andres Quiroz Hernandez @version 6.9

Examples of programming5.code.RandomIndexGenerator

    protected RandomIndexGenerator alphabeticMixedCaseRandom;
    protected Random lengthRandom;


    public RandomStringGenerator() {
        lengthRandom = new Random(System.currentTimeMillis());
        generalRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "32-126");   // TODO: What is a good code range for all?
        numericRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "48-57");
        alphanumericRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "48-57, 97-122");
        alphabeticRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "97 - 122");
        alphanumericMixedCaseRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "48-57, 97-122, 65-90");
        alphabeticMixedCaseRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "65-90, 97-122");
    }

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Examples of programming5.code.RandomIndexGenerator

    /**
     * @param seed seed for random number generators
     */
    public RandomStringGenerator(long seed) {
        lengthRandom = new Random(seed);
        generalRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "32-126");
        numericRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "48-57");
        alphanumericRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "48-57, 97-122");
        alphabeticRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "97 - 122");
        alphanumericMixedCaseRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "48-57, 97-122, 65-90");
        alphabeticMixedCaseRandom = new RandomIndexGenerator(lengthRandom.nextLong(), "65-90, 97-122");
    }

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Examples of programming5.code.RandomIndexGenerator

        }
        int[][] aux = new int[ranges.length][];
        for (int i = 0; i < ranges.length; i++) {
            aux[i] = (int[]) ranges[i];
        }
        RandomIndexGenerator customRandom = new RandomIndexGenerator(lengthRandom.nextLong(), aux);
        // Generate string
        String ret = "";
        for (int i = 0; i < length; i++) {
            ret += Character.toString((char) customRandom.getRandomIndex());
        }
        return ret;
    }

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Examples of programming5.code.RandomIndexGenerator

    }


    @BeforeClass
    public static void setUpClass() throws Exception {
        df = new KeyboardCharDistanceFunction();
        RandomIndexGenerator rig = new RandomIndexGenerator("32-126");
        arbitrary1 = (char) rig.getRandomIndex();
        arbitrary2 = (char) rig.getRandomIndex();
        arbitrary3 = (char) rig.getRandomIndex();
    }

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