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add method addIfNotNull

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This commit is contained in:
darin.kelkhoff
2024-12-13 10:56:46 -06:00
parent edec6d64e3
commit 21a5c98376
2 changed files with 33 additions and 0 deletions
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12
qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/utils/CollectionUtils.java
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@ -700,4 +700,16 @@ public class CollectionUtils
return (map.containsKey(key) && map.get(key) != null); return (map.containsKey(key) && map.get(key) != null);
} }
/***************************************************************************
** add an element to a collection, but, only if the element isn't null
***************************************************************************/
public static <T, E extends T> void addIfNotNull(Collection<T> c, E element)
{
if(element != null)
{
c.add(element);
}
}
} }

21
qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/utils/CollectionUtilsTest.java
View File

@ -26,10 +26,12 @@ import java.util.ArrayList;
import java.util.Collection; import java.util.Collection;
import java.util.Collections; import java.util.Collections;
import java.util.HashMap; import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable; import java.util.Hashtable;
import java.util.LinkedList; import java.util.LinkedList;
import java.util.List; import java.util.List;
import java.util.Map; import java.util.Map;
import java.util.Set;
import java.util.TreeMap; import java.util.TreeMap;
import java.util.function.Function; import java.util.function.Function;
import com.google.gson.reflect.TypeToken; import com.google.gson.reflect.TypeToken;
@ -618,4 +620,23 @@ class CollectionUtilsTest extends BaseTest
4, Map.of("B", "B4")), output); 4, Map.of("B", "B4")), output);
} }
/*******************************************************************************
**
*******************************************************************************/
@Test
void testAddIfNotNull()
{
HashSet<String> s = new HashSet<>();
CollectionUtils.addIfNotNull(s, null);
assertEquals(Set.of(), s);
CollectionUtils.addIfNotNull(s, "");
assertEquals(Set.of(""), s);
CollectionUtils.addIfNotNull(s, "1");
assertEquals(Set.of("", "1"), s);
}
} }