/**
* Build the table of plug-in dependencies. Iterate over all the plug-ins in the plug-in registry
* and the cycle through the list of pre-requisites and create the parent/child relationships in
* the nodes.
*/
private Map getDependencyGraph() {
if (dependencyGraph != null) return dependencyGraph;
// Build up the dependency graph (see PluginDependencyGraphNode) so
// we have the information readily available for any plug-in.
State state = Platform.getPlatformAdmin().getState(false);
BundleDescription[] plugins = state.getBundles();
dependencyGraph = new HashMap();
for (int i = 0; i < plugins.length; i++) {
BundleDescription descriptor = plugins[i];
PluginDependencyGraphNode node =
(PluginDependencyGraphNode) dependencyGraph.get(new Long(descriptor.getBundleId()));
if (node == null) {
node = new PluginDependencyGraphNode(descriptor);
dependencyGraph.put(new Long(descriptor.getBundleId()), node);
}
// Cycle through the prerequisites
BundleSpecification[] requires = descriptor.getRequiredBundles();
for (int j = 0; j < requires.length; j++) {
BundleDescription childDesc = (BundleDescription) requires[j].getSupplier();
// if the child doesn't exist then move to the next child
if (childDesc == null) continue;
// if the child entry is not in the table yet then add it
PluginDependencyGraphNode childNode =
(PluginDependencyGraphNode) dependencyGraph.get(new Long(childDesc.getBundleId()));
if (childNode == null) {
childNode = new PluginDependencyGraphNode(childDesc);
dependencyGraph.put(new Long(childDesc.getBundleId()), childNode);
}
// Add the child to this node's children and set this node as an ancestor
// of the child node
node.addChild(childNode);
childNode.addAncestor(node);
}
}
return dependencyGraph;
}
