ATLAS-3031: UI : Allow user to export the lineage in PNG or JPEG format

graphdb/janus/src/main/java/org/apache/atlas/repository/graphdb/janus/AtlasJanusElement.java

@@ -109,7 +109,14 @@ public class AtlasJanusElement<T extends Element> implements AtlasElement {
     @Override
     public void setProperty(String propertyName, Object value) {
         try {
+            if (value == null) {
+                Object existingVal = getProperty(propertyName, Object.class);
+                if (existingVal != null) {
+                    removeProperty(propertyName);
+                }
+            } else {
                 getWrappedElement().property(propertyName, value);
+            }
         } catch(SchemaViolationException e) {
             throw new AtlasSchemaViolationException(e);
         }
@@ -157,9 +164,6 @@ public class AtlasJanusElement<T extends Element> implements AtlasElement {
     @Override
     public List<String> getListProperty(String propertyName) {
         List<String> value =  getProperty(propertyName, List.class);
-        if (value == null) {
-            return Collections.emptyList();
-        }
         return value;
     }
 
@@ -200,7 +204,7 @@ public class AtlasJanusElement<T extends Element> implements AtlasElement {
 
         List<String> value = getListProperty(propertyName);
 
-        if (value.isEmpty()) {
+        if (value == null || value.isEmpty()) {
             return (List<V>)value;
         }
 

intg/src/main/java/org/apache/atlas/type/AtlasArrayType.java

@@ -154,9 +154,9 @@ public class AtlasArrayType extends AtlasType {
         boolean ret = true;
 
         if (val1 == null) {
-            ret = isEmptyArrayValue(val2);
+            ret = val2 == null;
         } else if (val2 == null) {
-            ret = isEmptyArrayValue(val1);
+            ret = false;
         } else {
             if (val1.getClass().isArray() && val2.getClass().isArray()) {
                 int len = Array.getLength(val1);
@@ -510,9 +510,7 @@ public class AtlasArrayType extends AtlasType {
     }
 
     private boolean isEmptyArrayValue(Object val) {
-        if (val == null) {
-            return true;
-        } else if (val instanceof Collection) {
+        if (val instanceof Collection) {
             return ((Collection) val).isEmpty();
         } else if (val.getClass().isArray()) {
             return Array.getLength(val) == 0;

intg/src/test/java/org/apache/atlas/TestUtilsV2.java

@@ -553,6 +553,7 @@ public final class TestUtilsV2 {
     public static final String SERDE_TYPE = "serdeType";
     public static final String COLUMNS_MAP = "columnsMap";
     public static final String COLUMNS_ATTR_NAME = "columns";
+    public static final String ENTITY_TYPE_WITH_SIMPLE_ATTR = "entity_with_simple_attr";
     public static final String ENTITY_TYPE_WITH_NESTED_COLLECTION_ATTR = "entity_with_nested_collection_attr";
     public static final String ENTITY_TYPE_WITH_COMPLEX_COLLECTION_ATTR = "entity_with_complex_collection_attr";
     public static final String ENTITY_TYPE_WITH_COMPLEX_COLLECTION_ATTR_DELETE = "entity_with_complex_collection_attr_delete";
@@ -621,6 +622,42 @@ public final class TestUtilsV2 {
         return ret;
     }
 
+    public static AtlasTypesDef defineSimpleAttrType() {
+        AtlasEntityDef simpleAttributesEntityType =
+            createClassTypeDef(ENTITY_TYPE_WITH_SIMPLE_ATTR, ENTITY_TYPE_WITH_SIMPLE_ATTR + "_description", null,
+                createUniqueRequiredAttrDef("name", "string"),
+
+                new AtlasAttributeDef("stringAtrr", "string",
+                    true,
+                    SINGLE, 1, 1,
+                    false, false, false, null),
+
+                new AtlasAttributeDef("arrayOfStrings",
+                    "array<string>", true, SINGLE, 1, 1,
+                    false, false, false, null),
+
+                new AtlasAttributeDef("mapOfStrings", "map<string,string>",
+                    true, SINGLE, 1,1, false, false, false, null)
+            );
+
+        AtlasTypesDef ret = AtlasTypeUtil.getTypesDef(Collections.<AtlasEnumDef>emptyList(),
+            Collections.<AtlasStructDef>emptyList(),
+            Collections.<AtlasClassificationDef>emptyList(),
+            Collections.singletonList(simpleAttributesEntityType));
+
+        return ret;
+    }
+
+    public static AtlasEntityWithExtInfo createSimpleAttrTypeEntity() {
+        AtlasEntity entity = new AtlasEntity(ENTITY_TYPE_WITH_SIMPLE_ATTR);
+
+        entity.setAttribute(NAME, ENTITY_TYPE_WITH_SIMPLE_ATTR);
+        entity.setAttribute("stringAtrr", "DummyThree");
+        entity.setAttribute("arrayOfStrings", Arrays.asList("DummyOne", "DummyTwo"));
+        entity.setAttribute("mapOfStrings", Collections.singletonMap("one", "DummyString"));
+
+        return new AtlasEntityWithExtInfo(entity);
+    }
 
     public static AtlasTypesDef defineHiveTypes() {
         String _description = "_description";

repository/src/main/java/org/apache/atlas/repository/graph/GraphHelper.java

@@ -1587,10 +1587,6 @@ public final class GraphHelper {
     public static Map<String, Object> getPrimitiveMap(AtlasVertex instanceVertex, String propertyName) {
         Map<String, Object> ret = instanceVertex.getProperty(AtlasGraphUtilsV2.encodePropertyKey(propertyName), Map.class);
 
-        if (ret == null) {
-            ret = new HashMap<>();
-        }
-
         return ret;
     }
 

repository/src/main/java/org/apache/atlas/repository/store/graph/v2/AtlasGraphUtilsV2.java

@@ -228,12 +228,11 @@ public class AtlasGraphUtilsV2 {
 
         Object existingValue = element.getProperty(propertyName, Object.class);
 
-        if (value == null || (value instanceof Collection && ((Collection)value).isEmpty())) {
+        if (value == null) {
             if (existingValue != null) {
                 if (LOG.isDebugEnabled()) {
                     LOG.debug("Removing property {} from {}", propertyName, toString(element));
                 }
-
                 element.removeProperty(propertyName);
             }
         } else {
@@ -242,7 +241,7 @@ public class AtlasGraphUtilsV2 {
                     LOG.debug("Setting property {} in {}", propertyName, toString(element));
                 }
 
-                if ( value instanceof Date) {
+                if (value instanceof Date) {
                     Long encodedValue = ((Date) value).getTime();
                     element.setProperty(propertyName, encodedValue);
                 } else {

repository/src/main/java/org/apache/atlas/repository/store/graph/v2/EntityGraphMapper.java

@@ -947,7 +947,12 @@ public class EntityGraphMapper {
         boolean             isReference = isReference(mapType.getValueType());
         boolean             isSoftReference = ctx.getAttribute().getAttributeDef().isSoftReferenced();
 
-        if (MapUtils.isNotEmpty(newVal)) {
+        boolean isNewValNull = newVal == null;
+
+        if (isNewValNull) {
+            newVal = new HashMap<>();
+        }
+
         String propertyName = ctx.getVertexProperty();
 
         if (isReference) {
@@ -987,12 +992,18 @@ public class EntityGraphMapper {
             newMap.putAll(finalMap);
         } else {
             // primitive type map
+            if (isNewValNull) {
+                ctx.getReferringVertex().setProperty(propertyName, null);
+            } else {
                 ctx.getReferringVertex().setProperty(propertyName, new HashMap<>(newVal));
-
+            }
             newVal.forEach((key, value) -> newMap.put(key.toString(), value));
         }
 
         if (isSoftReference) {
+            if (isNewValNull) {
+                ctx.getReferringVertex().setProperty(propertyName,null);
+            } else {
                 ctx.getReferringVertex().setProperty(propertyName, new HashMap<>(newMap));
             }
         }
@@ -1019,6 +1030,7 @@ public class EntityGraphMapper {
         Cardinality    cardinality         = attribute.getAttributeDef().getCardinality();
         List<Object>   newElementsCreated  = new ArrayList<>();
         List<Object>   currentElements;
+        boolean isNewElementsNull          = newElements == null;
 
         if (isReference && !isSoftReference) {
             currentElements = (List) getCollectionElementsUsingRelationship(ctx.getReferringVertex(), attribute);
@@ -1026,7 +1038,10 @@ public class EntityGraphMapper {
             currentElements = (List) getArrayElementsProperty(elementType, isSoftReference, ctx.getReferringVertex(), ctx.getVertexProperty());
         }
 
-        if (CollectionUtils.isNotEmpty(newElements)) {
+        if (isNewElementsNull) {
+            newElements = new ArrayList();
+        }
+
         if (cardinality == SET) {
             newElements = (List) newElements.stream().distinct().collect(Collectors.toList());
         }
@@ -1049,7 +1064,6 @@ public class EntityGraphMapper {
                 newElementsCreated.add(newEntry);
             }
         }
-        }
 
         if (isReference && !isSoftReference) {
             List<AtlasEdge> additionalEdges = removeUnusedArrayEntries(attribute, (List) currentElements, (List) newElementsCreated, ctx.getReferringVertex());
@@ -1065,8 +1079,11 @@ public class EntityGraphMapper {
             }
         }
 
-        // for dereference on way out
+        if (isNewElementsNull) {
+            setArrayElementsProperty(elementType, isSoftReference, ctx.getReferringVertex(), ctx.getVertexProperty(), null);
+        } else {
             setArrayElementsProperty(elementType, isSoftReference, ctx.getReferringVertex(), ctx.getVertexProperty(), newElementsCreated);
+        }
 
         if (LOG.isDebugEnabled()) {
             LOG.debug("<== mapArrayValue({})", ctx);

repository/src/main/java/org/apache/atlas/repository/store/graph/v2/EntityGraphRetriever.java

@@ -74,6 +74,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.ListIterator;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
@@ -740,7 +741,9 @@ public class EntityGraphRetriever {
         Map<String, AtlasObjectId> ret        = null;
         Map                        softRefVal = entityVertex.getProperty(attribute.getVertexPropertyName(), Map.class);
 
-        if (MapUtils.isNotEmpty(softRefVal)) {
+        if (MapUtils.isEmpty(softRefVal)) {
+            return softRefVal;
+        } else {
             ret = new HashMap<>();
 
             for (Object mapKey : softRefVal.keySet()) {
@@ -751,7 +754,6 @@ public class EntityGraphRetriever {
                 }
             }
         }
-
         return ret;
     }
 
@@ -759,7 +761,9 @@ public class EntityGraphRetriever {
         List<AtlasObjectId> ret        = null;
         List                softRefVal = entityVertex.getListProperty(attribute.getVertexPropertyName(), List.class);
 
-        if (CollectionUtils.isNotEmpty(softRefVal)) {
+        if (CollectionUtils.isEmpty(softRefVal)) {
+            return softRefVal;
+        } else {
             ret = new ArrayList<>();
 
             for (Object o : softRefVal) {
@@ -841,10 +845,6 @@ public class EntityGraphRetriever {
             ret = getPrimitiveMap(entityVertex, attribute.getVertexPropertyName());
         }
 
-        if (MapUtils.isEmpty(ret)) {
-            ret = null;
-        }
-
         return ret;
     }
 
@@ -855,14 +855,14 @@ public class EntityGraphRetriever {
         AtlasType      arrayElementType = arrayType.getElementType();
         List<Object>   arrayElements    = getArrayElementsProperty(arrayElementType, entityVertex, attribute);
 
-        if (CollectionUtils.isEmpty(arrayElements)) {
-            return null;
-        }
-
         if (LOG.isDebugEnabled()) {
             LOG.debug("Mapping array attribute {} for vertex {}", arrayElementType.getTypeName(), entityVertex);
         }
 
+        if (CollectionUtils.isEmpty(arrayElements)) {
+            return arrayElements;
+        }
+
         List                           arrValues     = new ArrayList(arrayElements.size());
         String                         edgeLabel     = attribute.getRelationshipEdgeLabel();
         AtlasRelationshipEdgeDirection edgeDirection = attribute.getRelationshipEdgeDirection();

repository/src/test/java/org/apache/atlas/repository/store/graph/v2/AtlasComplexAttributesTest.java

@@ -38,6 +38,7 @@ import org.testng.annotations.Test;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -48,6 +49,7 @@ import static org.apache.atlas.TestUtilsV2.ENTITY_TYPE;
 import static org.apache.atlas.TestUtilsV2.ENTITY_TYPE_MAP;
 import static org.apache.atlas.TestUtilsV2.ENTITY_TYPE_WITH_COMPLEX_COLLECTION_ATTR;
 import static org.apache.atlas.TestUtilsV2.ENTITY_TYPE_WITH_COMPLEX_COLLECTION_ATTR_DELETE;
+import static org.apache.atlas.TestUtilsV2.ENTITY_TYPE_WITH_SIMPLE_ATTR;
 import static org.apache.atlas.TestUtilsV2.NAME;
 import static org.apache.atlas.repository.graph.GraphHelper.getStatus;
 import static org.apache.atlas.type.AtlasTypeUtil.getAtlasObjectId;
@@ -66,7 +68,8 @@ public class AtlasComplexAttributesTest extends AtlasEntityTestBase {
 
         // create typeDefs
         AtlasTypesDef[] testTypesDefs = new AtlasTypesDef[] { TestUtilsV2.defineTypeWithComplexCollectionAttributes(),
-                                                              TestUtilsV2.defineTypeWithMapAttributes() };
+                                                              TestUtilsV2.defineTypeWithMapAttributes(),
+                                                              TestUtilsV2.defineSimpleAttrType()};
         createTypesDef(testTypesDefs);
 
         // create entity
@@ -195,6 +198,51 @@ public class AtlasComplexAttributesTest extends AtlasEntityTestBase {
         attrEntity.setAttribute("mapAttr5", map5);
     }
 
+    @Test
+    public void testArrayAttribute() throws Exception {
+        init();
+
+        AtlasEntityWithExtInfo simpleEntity  = TestUtilsV2.createSimpleAttrTypeEntity();
+        EntityMutationResponse response      = entityStore.createOrUpdate(new AtlasEntityStream(simpleEntity), false);
+        AtlasEntityHeader simpleEntityHeader = response.getFirstCreatedEntityByTypeName(ENTITY_TYPE_WITH_SIMPLE_ATTR);
+        AtlasEntity createdSimpleEntity      = getEntityFromStore(simpleEntityHeader);
+
+        validateEntity(simpleEntity, createdSimpleEntity);
+
+        createdSimpleEntity.setAttribute("stringAtrr", null);
+        createdSimpleEntity.setAttribute("mapOfStrings", Collections.emptyMap());
+        createdSimpleEntity.setAttribute("arrayOfStrings", Collections.emptyList());
+        EntityMutationResponse responseUpdated      = entityStore.createOrUpdate(new AtlasEntityStream(createdSimpleEntity), false);
+        AtlasEntityHeader simpleEntityUpdatedHeader = responseUpdated.getFirstUpdatedEntityByTypeName(ENTITY_TYPE_WITH_SIMPLE_ATTR);
+        AtlasEntity updatedSimpleEntity             = getEntityFromStore(simpleEntityUpdatedHeader);
+
+        assertNull(updatedSimpleEntity.getAttribute("stringAtrr"));
+        assertEquals(updatedSimpleEntity.getAttribute("mapOfStrings"), Collections.emptyMap());
+        assertEquals(updatedSimpleEntity.getAttribute("arrayOfStrings"), Collections.emptyList());
+
+        updatedSimpleEntity.setAttribute("stringAtrr", "");
+        updatedSimpleEntity.setAttribute("mapOfStrings", null);
+        updatedSimpleEntity.setAttribute("arrayOfStrings", null);
+        EntityMutationResponse responseUpdatedAgain      = entityStore.createOrUpdate(new AtlasEntityStream(updatedSimpleEntity), false);
+        AtlasEntityHeader simpleEntityUpdatedAgainHeader = responseUpdatedAgain.getFirstUpdatedEntityByTypeName(ENTITY_TYPE_WITH_SIMPLE_ATTR);
+        AtlasEntity updatedAgainSimpleEntity             = getEntityFromStore(simpleEntityUpdatedAgainHeader);
+
+        assertEquals(updatedAgainSimpleEntity.getAttribute("stringAtrr"), "");
+        assertNull(updatedAgainSimpleEntity.getAttribute("arrayOfStrings"));
+        assertNull(updatedAgainSimpleEntity.getAttribute("mapOfStrings"));
+
+        updatedAgainSimpleEntity.setAttribute("stringAtrr", "Dummy String Test 3");
+        updatedAgainSimpleEntity.setAttribute("mapOfStrings", Collections.singletonMap("key1", "val1"));
+        updatedAgainSimpleEntity.setAttribute("arrayOfStrings", Arrays.asList("DummyTest3", "DummyTest4"));
+        EntityMutationResponse updateRes   = entityStore.createOrUpdate(new AtlasEntityStream(updatedAgainSimpleEntity), false);
+        AtlasEntityHeader updateHeader = updateRes.getFirstUpdatedEntityByTypeName(ENTITY_TYPE_WITH_SIMPLE_ATTR);
+        AtlasEntity updateEntity = getEntityFromStore(updateHeader);
+
+        assertEquals(updateEntity.getAttribute("stringAtrr"), "Dummy String Test 3");
+        assertEquals(updateEntity.getAttribute("arrayOfStrings"), Arrays.asList("DummyTest3", "DummyTest4"));
+        assertEquals(updateEntity.getAttribute("mapOfStrings"), Collections.singletonMap("key1", "val1"));
+    }
+
     @Test(dependsOnMethods = "testCreateComplexAttributeEntity")
     public void testStructArray() throws Exception {
         init();