dosubot[bot] commented on issue #2410:
URL:
https://github.com/apache/incubator-hugegraph/issues/2410#issuecomment-1907077657
_🤖_
<!-- Answer -->
I apologize for the confusion, you're correct. Currently, the `name` of each
EdgeLabel should be unique in the incubator-hugegraph repository. This means
that you can't create duplicate EdgeLabels with the same name for different
VertexLabels.
This is evident from the constructor of the EdgeLabel class:
```java
public EdgeLabel(final HugeGraph graph, Id id, String name) {
super(graph, id, name);
this.frequency = Frequency.DEFAULT;
this.sortKeys = new ArrayList<>();
}
```
Here, `name` is passed as a parameter to the constructor and is passed to
the superclass constructor (`super(graph, id, name);`), where it is likely
stored as an attribute of the EdgeLabel. The `name` attribute of each EdgeLabel
is used to identify the edge label. It is a unique identifier for each edge
label in the graph database. This attribute is set when an EdgeLabel object is
created and it cannot be changed afterwards.
Also, in the test case `testRemoveEdgeLabel`, an EdgeLabel named "look" is
created and then removed. After removal, when trying to get the EdgeLabel
"look" again, a `NotFoundException` is thrown, indicating that the EdgeLabel no
longer exists. If the system allowed EdgeLabels with the same `name` attribute,
this exception would not be thrown as another EdgeLabel with the same name
could exist.
Here is the relevant code snippet:
```java
@Test
public void testRemoveEdgeLabel() {
super.initPropertyKeys();
SchemaManager schema = graph().schema();
schema.vertexLabel("person")
.properties("name", "age", "city")
.primaryKeys("name")
.create();
schema.vertexLabel("book")
.properties("name", "contribution")
.primaryKeys("name")
.create();
schema.edgeLabel("look").link("person", "book")
.properties("time", "city")
.create();
Assert.assertNotNull(schema.getEdgeLabel("look"));
schema.edgeLabel("look").remove();
Assert.assertThrows(NotFoundException.class, () -> {
schema.getEdgeLabel("look");
});
}
```
In this test case, an EdgeLabel named "look" is created, confirmed to exist,
and then removed. After removal, an attempt to get the EdgeLabel "look" results
in a `NotFoundException`, indicating that no EdgeLabel with the name "look"
exists. This suggests that EdgeLabels must have unique names.
I hope this clarifies the issue. If you have any further questions, feel
free to ask.
Sources:
-
[hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/EdgeLabel.java](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/EdgeLabel.java)
-
[hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeLabelCoreTest.java](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeLabelCoreTest.java)
## Sources
-
[hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeLabelCoreTest.java](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeLabelCoreTest.java)
-
[hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/EdgeLabel.java](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/EdgeLabel.java)
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