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https://issues.apache.org/jira/browse/TINKERPOP-1504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stephen mallette closed TINKERPOP-1504.
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Resolution: Done
Assignee: stephen mallette
Fix Version/s: 3.1.7
> MutationListener doesn't provide property key on property additions
> -------------------------------------------------------------------
>
> Key: TINKERPOP-1504
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1504
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.1.4, 3.2.2
> Reporter: Jason Plurad
> Assignee: stephen mallette
> Fix For: 3.1.7
>
>
> The signatures for
> [MutationListener|https://github.com/apache/tinkerpop/blob/3.1.4/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/MutationListener.java#L58]
> property changes look like this:
> * {{public void vertexPropertyChanged(final Vertex element, final Property
> oldValue, final Object setValue, final Object... vertexPropertyKeyValues);}}
> * {{public void edgePropertyChanged(final Edge element, final Property
> oldValue, final Object setValue);}}
> * {{public void vertexPropertyPropertyChanged(final VertexProperty element,
> final Property oldValue, final Object setValue);}}
> These methods are used when a property is *added* and when a property is
> *changed*. See usage in
> [AddPropertyStep|https://github.com/apache/tinkerpop/blob/3.1.4/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/sideEffect/AddPropertyStep.java#L93-L98].
> When a vertex property is added, the {{oldValue}} is {{null}}, so there is
> no way for the listener to get the {{String key}} of the added property.
> I can think of a few options here, all of which would be breaking changes:
> # Pass a non-null {{Property}} as the {{oldValue}} that has the property
> {{key}} but a {{null}} property value. The listener would get the property
> value from {{setValue}}.
> # Add a {{final String key}} to the signatures above.
> # Change the {{setValue}} to be {{final Property setValue}} so that the key
> can be gathered from the new value.
> # Add new methods on {{MutationListener}} for {{vertexPropertyAdded()}},
> {{edgePropertyAdded()}}, and {{vertexPropertyPropertyAdded()}}.
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