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The OpenTripPlanner multimodal journey planning system

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package org.opentripplanner.transit.raptor.util;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

/**
 * A utility class for integer functions.
 */
public final class IntUtils {
    /** The constructor is private to protect this class from being instantiated. */
    private IntUtils() {};


    /**
     * Convert an integer to a String, if the value equals the {@code notSetValue} parameter
     * an empty string is returned.
     */
    public static String intToString(int value, int notSetValue) {
        return value == notSetValue ? "" : Integer.toString(value);
    }


    /**
     * Create a new int array and initialize all values with the given {@code initialValue}.
     */
    public static int[] intArray(int size, int initialValue) {
        int [] array = new int[size];
        Arrays.fill(array, initialValue);
        return array;
    }

    /**
     * Concatenate list a and b and convert them to int arrays.
     */
    public static int[] concat(Collection a, Collection b) {
        List all = new ArrayList<>(a);
        all.addAll(b);
        return all.stream().mapToInt(it -> it).toArray();
    }

}