test_class.file: dddlib-utils/src/test/java/org/dayatang/utils/ArrayUtilsTest.java
test_class.identifier: ArrayUtilsTest
test_case.body: @Test
      public void testJoinNull() {
          String separator = ", ";
          Item[] items = null;
          String result = ArrayUtils.join(items, "id", separator);
          assertTrue(result.isEmpty());
      }
test_case.class_method_signature: ArrayUtilsTest.testJoinNull()
test_case.full_signature: @Test public void testJoinNull()
test_case.identifier: testJoinNull
test_case.invocations: join assertTrue isEmpty
test_case.modifiers: @Test public
test_case.parameters: ()
test_case.return: void
test_case.signature: void testJoinNull()
focal_class.file: dddlib-utils/src/main/java/org/dayatang/utils/ArrayUtils.java
focal_class.identifier: ArrayUtils
focal_class.class_method_signature: ArrayUtils.ArrayUtils()
focal_class.full_signature: private  ArrayUtils()
focal_class.identifier: ArrayUtils
focal_class.modifiers: private
focal_class.parameters: ()
focal_class.signature:  ArrayUtils()
focal_class.class_method_signature: ArrayUtils.substract(Object[] items, String property)
focal_class.full_signature: public static Object[] substract(Object[] items, String property)
focal_class.identifier: substract
focal_class.modifiers: public static
focal_class.parameters: (Object[] items, String property)
focal_class.return: Object[]
focal_class.signature: Object[] substract(Object[] items, String property)
focal_class.class_method_signature: ArrayUtils.join(Object[] items, String property, String separator)
focal_class.full_signature: public static String join(Object[] items, String property, String separator)
focal_class.identifier: join
focal_class.modifiers: public static
focal_class.parameters: (Object[] items, String property, String separator)
focal_class.return: String
focal_class.signature: String join(Object[] items, String property, String separator)
focal_method.body: public static String join(Object[] items, String property, String separator) {
          if (items == null || items.length == 0) {
              return "";
          }
          return StringUtils.join(substract(items, property), separator);
      }
focal_method.class_method_signature: ArrayUtils.join(Object[] items, String property, String separator)
focal_method.full_signature: public static String join(Object[] items, String property, String separator)
focal_method.identifier: join
focal_method.invocations: join substract
focal_method.modifiers: public static
focal_method.parameters: (Object[] items, String property, String separator)
focal_method.return: String
focal_method.signature: String join(Object[] items, String property, String separator)