/**
* Deletes the edge between outvertex and inVertex. The edge is for attribute attributeName of
* outVertex
*
* @param outVertex
* @param inVertex
* @param attributeName
* @throws AtlasException
*/
protected void deleteEdgeBetweenVertices(
AtlasVertex outVertex, AtlasVertex inVertex, String attributeName) throws AtlasException {
LOG.debug(
"Removing edge from {} to {} with attribute name {}",
string(outVertex),
string(inVertex),
attributeName);
String typeName = GraphHelper.getTypeName(outVertex);
String outId = GraphHelper.getIdFromVertex(outVertex);
Id.EntityState state = GraphHelper.getState(outVertex);
if ((outId != null && RequestContext.get().isDeletedEntity(outId))
|| state == Id.EntityState.DELETED) {
// If the reference vertex is marked for deletion, skip updating the reference
return;
}
IDataType type = typeSystem.getDataType(IDataType.class, typeName);
AttributeInfo attributeInfo = getFieldMapping(type).fields.get(attributeName);
String propertyName = GraphHelper.getQualifiedFieldName(type, attributeName);
String edgeLabel = EDGE_LABEL_PREFIX + propertyName;
AtlasEdge edge = null;
switch (attributeInfo.dataType().getTypeCategory()) {
case CLASS:
// If its class attribute, its the only edge between two vertices
if (attributeInfo.multiplicity.nullAllowed()) {
edge = graphHelper.getEdgeForLabel(outVertex, edgeLabel);
if (shouldUpdateReverseAttribute) {
GraphHelper.setProperty(outVertex, propertyName, null);
}
} else {
// Cannot unset a required attribute.
throw new NullRequiredAttributeException(
"Cannot unset required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ GraphHelper.getVertexDetails(outVertex)
+ " edge = "
+ edgeLabel);
}
break;
case ARRAY:
// If its array attribute, find the right edge between the two vertices and update array
// property
List<String> elements = GraphHelper.getListProperty(outVertex, propertyName);
if (elements != null) {
elements =
new ArrayList<>(
elements); // Make a copy, else list.remove reflects on titan.getProperty()
for (String elementEdgeId : elements) {
AtlasEdge elementEdge =
graphHelper.getEdgeByEdgeId(outVertex, edgeLabel, elementEdgeId);
if (elementEdge == null) {
continue;
}
AtlasVertex elementVertex = elementEdge.getInVertex();
if (elementVertex.equals(inVertex)) {
edge = elementEdge;
// TODO element.size includes deleted items as well. should exclude
if (!attributeInfo.multiplicity.nullAllowed()
&& elements.size() <= attributeInfo.multiplicity.lower) {
// Deleting this edge would violate the attribute's lower bound.
throw new NullRequiredAttributeException(
"Cannot remove array element from required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ GraphHelper.getVertexDetails(outVertex)
+ " "
+ GraphHelper.getEdgeDetails(elementEdge));
}
if (shouldUpdateReverseAttribute) {
// if composite attribute, remove the reference as well. else, just remove the edge
// for example, when table is deleted, process still references the table
// but when column is deleted, table will not reference the deleted column
LOG.debug(
"Removing edge {} from the array attribute {}",
string(elementEdge),
attributeName);
elements.remove(elementEdge.getId().toString());
GraphHelper.setProperty(outVertex, propertyName, elements);
break;
}
}
}
}
break;
case MAP:
// If its map attribute, find the right edge between two vertices and update map property
List<String> keys = GraphHelper.getListProperty(outVertex, propertyName);
if (keys != null) {
keys =
new ArrayList<>(
keys); // Make a copy, else list.remove reflects on titan.getProperty()
for (String key : keys) {
String keyPropertyName = GraphHelper.getQualifiedNameForMapKey(propertyName, key);
String mapEdgeId =
GraphHelper.getSingleValuedProperty(outVertex, keyPropertyName, String.class);
AtlasEdge mapEdge = graphHelper.getEdgeByEdgeId(outVertex, keyPropertyName, mapEdgeId);
if (mapEdge != null) {
AtlasVertex mapVertex = mapEdge.getInVertex();
if (mapVertex.getId().toString().equals(inVertex.getId().toString())) {
// TODO keys.size includes deleted items as well. should exclude
if (attributeInfo.multiplicity.nullAllowed()
|| keys.size() > attributeInfo.multiplicity.lower) {
edge = mapEdge;
} else {
// Deleting this entry would violate the attribute's lower bound.
throw new NullRequiredAttributeException(
"Cannot remove map entry "
+ keyPropertyName
+ " from required attribute "
+ GraphHelper.getQualifiedFieldName(type, attributeName)
+ " on "
+ GraphHelper.getVertexDetails(outVertex)
+ " "
+ GraphHelper.getEdgeDetails(mapEdge));
}
if (shouldUpdateReverseAttribute) {
// remove this key
LOG.debug(
"Removing edge {}, key {} from the map attribute {}",
string(mapEdge),
key,
attributeName);
keys.remove(key);
GraphHelper.setProperty(outVertex, propertyName, keys);
GraphHelper.setProperty(outVertex, keyPropertyName, null);
}
break;
}
}
}
}
break;
case STRUCT:
case TRAIT:
break;
default:
throw new IllegalStateException(
"There can't be an edge from "
+ GraphHelper.getVertexDetails(outVertex)
+ " to "
+ GraphHelper.getVertexDetails(inVertex)
+ " with attribute name "
+ attributeName
+ " which is not class/array/map attribute");
}
if (edge != null) {
deleteEdge(edge, false);
RequestContext requestContext = RequestContext.get();
GraphHelper.setProperty(
outVertex,
Constants.MODIFICATION_TIMESTAMP_PROPERTY_KEY,
requestContext.getRequestTime());
requestContext.recordEntityUpdate(outId);
}
}
