Zest and JFace

JFace provides viewers to encapsulate the data from the presentation. For an introduction to JFace viewer please see Eclipse JFace Table Viewer. A JFace viewer requires a content provider and a label provider. Zest provides as a viewer the class "GraphViewer". Content provider in Zest are either based on the connections or on the nodes.

Standard Zest Content providers are:

Table 2. Zest JFace Content Provider

Content Provider	Description
IGraphContentProvider	Based on the connections. The connections contain the information which nodes they refer to. Cannot display nodes without connections.
IGraphEntityContentProvider	Based on the Node which contain the information about which relationship they have. These relationship are available in the label provider as EntityConnectionData objects.
IGraphEntityRelationshipContentProvider	Node based, the content provider defines getRelationShips(sourceNode, destinationNode) which determines the connections. The advantages compared with IGraphEntityContentProvider is that you decide which objects you return.

As label provider Zest can use the standard JFace interface ILabelProvider (implemented for example by the class LabelProvider) or the Zest specific IEntityStyleProvider.