add new api to array utils

Author: JavaSaBr

rlib-common/src/main/java/com/ss/rlib/common/util/ArrayUtils.java

@@ -32,6 +32,56 @@ public final class ArrayUtils {
     public static final long[] EMPTY_LONG_ARRAY = new long[0];
     public static final char[] EMPTY_CHAR_ARRAY = new char[0];
 
+    /**
+     * Convert an object integer array to primitive int array.
+     *
+     * @param array the object integer array.
+     * @return the primitive int array.
+     */
+    public static @NotNull int[] toIntArray(@NotNull Integer[] array) {
+
+        if (array.length < 1) {
+            return ArrayUtils.EMPTY_INT_ARRAY;
+        }
+
+        var intArray = new int[array.length];
+
+        for (int i = 0; i < array.length; i++) {
+            intArray[i] = array[i];
+        }
+
+        return intArray;
+    }
+
+    /**
+     * Convert an string to primitive int array by regex.
+     *
+     * @param string the string.
+     * @param regex  the regex.
+     * @return the primitive int array.
+     * @throws NumberFormatException if some elements in the string are not an integer.
+     */
+    public static @NotNull int[] toIntArray(@NotNull String string, @NotNull String regex) {
+
+        if (string.isBlank()) {
+            return ArrayUtils.EMPTY_INT_ARRAY;
+        }
+
+        var elements = string.split(regex);
+
+        if (elements.length < 1) {
+            return ArrayUtils.EMPTY_INT_ARRAY;
+        }
+
+        var intArray = new int[elements.length];
+
+        for (int i = 0; i < elements.length; i++) {
+            intArray[i] = Integer.parseInt(elements[i].trim());
+        }
+
+        return intArray;
+    }
+
     /**
      * Add the element to the array and extend or create the array if need.
      *
@@ -279,7 +329,7 @@ public static boolean contains(@NotNull Object[] array, @NotNull Object object)
     }
 
     /**
-     * Copy and extend if need a native array array.
+     * Copy and extend if need a native array.
      *
      * @param <T>      the array component's type.
      * @param original the original array.

rlib-common/src/test/java/com/ss/rlib/common/test/util/ArrayUtilsTests.java

@@ -1,10 +1,49 @@
 package com.ss.rlib.common.test.util;
 
+import com.ss.rlib.common.util.ArrayUtils;
+import com.ss.rlib.common.util.array.ArrayFactory;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
 /**
  * Test of methods in ArrayUtils class.
  *
  * @author JavaSaBr
  */
 public class ArrayUtilsTests {
 
+    @Test
+    void convertIntegerArrayToIntArrayTest() {
+
+        Integer[] integers = ArrayFactory.toArray(1, 2, 3, 4, 5);
+        int[] ints = ArrayUtils.toIntArray(integers);
+        int[] empty = ArrayUtils.toIntArray(new Integer[0]);
+
+        Assertions.assertArrayEquals(ints, ArrayFactory.toIntArray(1, 2, 3, 4, 5));
+        Assertions.assertArrayEquals(empty, ArrayFactory.toIntArray());
+    }
+
+    @Test
+    void convertStringToIntArrayTest() {
+
+        Assertions.assertArrayEquals(
+            ArrayUtils.toIntArray("1,2,3,4,5", ","),
+            ArrayFactory.toIntArray(1, 2, 3, 4, 5)
+        );
+        Assertions.assertArrayEquals(
+            ArrayUtils.toIntArray(" 1 ,2 , 3,4, 5", ","),
+            ArrayFactory.toIntArray(1, 2, 3, 4, 5)
+        );
+        Assertions.assertArrayEquals(
+            ArrayUtils.toIntArray(" 1 ,2 , 3,4, 5", ","),
+            ArrayFactory.toIntArray(1, 2, 3, 4, 5)
+        );
+
+        Assertions.assertThrows(NumberFormatException.class,
+            () -> ArrayUtils.toIntArray(" 1 ,,2 , 3,4, 5,", ","));
+        Assertions.assertThrows(NumberFormatException.class,
+            () -> ArrayUtils.toIntArray(" 1 ,qwd , 3,4, 5", ","));
+        Assertions.assertThrows(NumberFormatException.class,
+            () -> ArrayUtils.toIntArray(" 1 ,2.5 , 3,4, 5", ","));
+    }
 }