org.opentripplanner.transit.raptor.util.IntUtils Maven / Gradle / Ivy
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();
}
}