test_class.file: dddlib-utils/src/test/java/org/dayatang/utils/CollectionUtilsTest.java
test_class.identifier: CollectionUtilsTest
test_case.body: @Test
  	public void testJoinEmpty() {
  		String separator = ", ";
  		String result = CollectionUtils.join(new ArrayList<Object>(), "id", separator);
  		assertTrue(result.isEmpty());
  	}
test_case.class_method_signature: CollectionUtilsTest.testJoinEmpty()
test_case.full_signature: @Test public void testJoinEmpty()
test_case.identifier: testJoinEmpty
test_case.invocations: join assertTrue isEmpty
test_case.modifiers: @Test public
test_case.parameters: ()
test_case.return: void
test_case.signature: void testJoinEmpty()
focal_class.file: dddlib-utils/src/main/java/org/dayatang/utils/CollectionUtils.java
focal_class.identifier: CollectionUtils
focal_class.class_method_signature: CollectionUtils.CollectionUtils()
focal_class.full_signature: private  CollectionUtils()
focal_class.identifier: CollectionUtils
focal_class.modifiers: private
focal_class.parameters: ()
focal_class.signature:  CollectionUtils()
focal_class.class_method_signature: CollectionUtils.substract(Collection<?> items, String property)
focal_class.full_signature: public static Collection<?> substract(Collection<?> items, String property)
focal_class.identifier: substract
focal_class.modifiers: public static
focal_class.parameters: (Collection<?> items, String property)
focal_class.return: Collection<?>
focal_class.signature: Collection<?> substract(Collection<?> items, String property)
focal_class.class_method_signature: CollectionUtils.join(Collection<?> items, String property, String separator)
focal_class.full_signature: public static String join(Collection<?> items, String property, String separator)
focal_class.identifier: join
focal_class.modifiers: public static
focal_class.parameters: (Collection<?> items, String property, String separator)
focal_class.return: String
focal_class.signature: String join(Collection<?> items, String property, String separator)
focal_method.body: public static String join(Collection<?> items, String property, String separator) {
          if (items == null) {
              return "";
          }
          return StringUtils.join(substract(items, property), separator);
      }
focal_method.class_method_signature: CollectionUtils.join(Collection<?> items, String property, String separator)
focal_method.full_signature: public static String join(Collection<?> items, String property, String separator)
focal_method.identifier: join
focal_method.invocations: join substract
focal_method.modifiers: public static
focal_method.parameters: (Collection<?> items, String property, String separator)
focal_method.return: String
focal_method.signature: String join(Collection<?> items, String property, String separator)