// verifies that two contexts are compatible for association
private void _verifyContextCompatibility(BplContext context1, BplContext context2) {
if (context1 == context2 || context1 == null || context2 == null) return;
if (!(context1.IsA<BplGlobalContext>() ^ context2.IsA<BplGlobalContext>())) {
BplRuntimeException.Throw("Attempt to associate objects from different contexts '{0}' and '{1}'".Substitute(context1, context2), this);
}
}
// attaches a node to the given context
private void _attachToContext(BplContextNode node, BplContext context) {
// check that the node can and needs to be attached to the context
// assumptions: node and context are not null and node.Context != context
if (node.Context != null) {
_verifyContextCompatibility(node.Context, context);
return;
}
if (context.IsA<BplGlobalContext>() && !node.IsA<BplTaxonomy>()) {
return;
}
// attach node to context, and index/seal it as needed
context.AttachNode(node);
// recursively attach the node's children
foreach (var child in node.Children.Where(child => child.Context != context)) {
_attachToContext(child, context);
}
// recursively attach the node's target associations
if (node.HasTargets) {
foreach (var target in node.Targets.Where(target => target.Context != context)) {
_attachToContext(target, context);
}
}
// recursively attach the node's source associations
if (node.HasSources) {
foreach (var source in node.Sources.Where(source => BplContext.GetOwner(source) != context)) {
if (source.IsA<BplContext>()) {
_verifyContextCompatibility((BplContext)source, context);
} else {
_attachToContext((BplContextNode)source, context);
}
}
}
}