Bug 283978

Description Philippe Coucaud 2009-07-20 03:21:35 EDT

Build ID: I20090611-1540

1. instantiate a GraphViewer, set a content provider of type IGraphContentProvider, set proper label provider and input element (calling setInput() is required).
2. change the content provider to be of a different type than IGraphContentProvider (e.g. IGraphEntityContentProvider)
3. set a new input (calling setInput() is required): a ClassCastException exception occurs in GraphModelEntityFactory.doBuildGraph():

java.lang.ClassCastException: [...] cannot be cast to org.eclipse.zest.core.viewers.IGraphEntityContentProvider
at org.eclipse.zest.core.viewers.internal.GraphModelEntityFactory.doBuildGraph(GraphModelEntityFactory.java:87)
at org.eclipse.zest.core.viewers.internal.GraphModelEntityFactory.createGraphModel(GraphModelEntityFactory.java:45)
at org.eclipse.zest.core.viewers.internal.AbstractStructuredGraphViewer.inputChanged(AbstractStructuredGraphViewer.java:482)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:274)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1634)
[...]

Because the factory created by GraphViewer.getFactory() is cached in 'modelFactory', only one type of content provider is allowed once the GraphViewer's input is set. The cache should probably be flushed when the type of the content provider changes.