Merge pull request #124 from egovframe-contribution/add_isEmpty

표준프레임워크 발전을 위한 소중한 의견에 감사드립니다.

Foundation/org.egovframe.rte.fdl.string/src/main/java/org/egovframe/rte/fdl/string/EgovObjectUtil.java

@@ -15,10 +15,15 @@
  */
 package org.egovframe.rte.fdl.string;
 
+import com.sun.istack.internal.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.lang.reflect.Array;
 import java.lang.reflect.Constructor;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Optional;
 
 /**
  * 객체의 로딩을 지원하는 유틸 클래스
@@ -137,6 +142,27 @@ public static Object instantiate(String className, String[] types, Object[] valu
     public static boolean isNull(Object object) {
         //return ((object == null) || object.equals(null));
 		return (object == null) ? true : false;
+
     }
 
+	/**
+	 * 객체가 비어있는 값인지 확인한다. (list == [] or null)
+	 * @param obj
+	 * @return Null/비어있는경우 true / Null이 아니거나 데이터가 있는경우 false
+	 */
+	public static boolean isEmpty(@Nullable Object obj) {
+		if (obj == null) {
+			return true;
+		} else if (obj instanceof Optional) {
+			return !((Optional)obj).isPresent();
+		} else if (obj instanceof CharSequence) {
+			return ((CharSequence)obj).length() == 0;
+		} else if (obj.getClass().isArray()) {
+			return Array.getLength(obj) == 0;
+		} else if (obj instanceof Collection) {
+			return ((Collection)obj).isEmpty();
+		} else {
+			return obj instanceof Map ? ((Map)obj).isEmpty() : false;
+		}
+	}
 }

Foundation/org.egovframe.rte.fdl.string/src/test/java/org/egovframe/rte/fdl/string/EgovObjectUtilTest.java

@@ -9,6 +9,8 @@
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
+import java.util.ArrayList;
+
 import static org.junit.Assert.*;
 
 
@@ -50,6 +52,19 @@ public void testIsNull() throws Exception {
 		assertTrue(EgovObjectUtil.isNull(null));
 	}
 
+	/**
+	 * [Flow #-2 Positive Case : check which Obejct is empty
+	 * @throws Exception
+	 */
+	@Test
+	public void testIsEmpty() throws Exception{
+		ArrayList<String> list = new ArrayList<>();
+		list.add("12124");
+
+		assertFalse(EgovObjectUtil.isEmpty(new Object()));
+		assertTrue(EgovObjectUtil.isEmpty(null));
+		assertFalse(EgovObjectUtil.isEmpty(list));
+	}
 
 	/**
 	 * @throws Exception