add new number util method

Author: JavaSaBr

build.gradle

@@ -8,7 +8,7 @@ buildscript {
     }
 }
 
-rootProject.version = '9.3.0'
+rootProject.version = '9.4.0'
 group = 'com.spaceshift'
 
 allprojects {

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

@@ -111,6 +111,26 @@ public static boolean isLong(@Nullable String string) {
         }
     }
 
+    /**
+     * Convert a string to int object or null if this string is null or not a number.
+     *
+     * @param string the string to convert.
+     * @return the int object or null.
+     * @since 9.4.0
+     */
+    public static @Nullable Integer safeToInt(@Nullable String string) {
+
+        if (string == null) {
+            return null;
+        } else {
+            try {
+                return Integer.valueOf(string);
+            } catch (NumberFormatException e) {
+                return null;
+            }
+        }
+    }
+
     /**
      * Convert a string to long object or null if this string is null or not a number.
      *

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

@@ -40,4 +40,13 @@ void shouldConvertStringToOptionalLong() {
         Assertions.assertFalse(NumberUtils.toOptionalLong(null).isPresent());
         Assertions.assertFalse(NumberUtils.toOptionalLong("2.1234").isPresent());
     }
+
+    @Test
+    void shouldSafetyConvertStringToInt() {
+        Assertions.assertNotNull(NumberUtils.safeToInt("1"));
+        Assertions.assertNotNull(NumberUtils.safeToInt("123124"));
+        Assertions.assertNull(NumberUtils.safeToInt("notlong"));
+        Assertions.assertNull(NumberUtils.safeToInt(null));
+        Assertions.assertNull(NumberUtils.safeToInt("2.1234"));
+    }
 }