/**
* Instantiate subviews for the given group view and the given key value to group-by. Makes
* shallow copies of each child view and its subviews up to the merge point. Sets up merge data
* views for merging the group-by key value back in.
*
* @param groupView is the parent view for which to copy subviews for
* @param groupByValues is the key values to group-by
* @param agentInstanceContext is the view services that sub-views may need
* @param propertyNames names of expressions or properties
* @return a single view or a list of views that are copies of the original list, with copied
* children, with data merge views added to the copied child leaf views.
*/
public static Object makeSubViews(
GroupByView groupView,
String[] propertyNames,
Object groupByValues,
AgentInstanceViewFactoryChainContext agentInstanceContext) {
if (!groupView.hasViews()) {
String message = "Unexpected empty list of child nodes for group view";
log.fatal(".copySubViews " + message);
throw new EPException(message);
}
Object subviewHolder;
if (groupView.getViews().length == 1) {
subviewHolder =
copyChildView(
groupView,
propertyNames,
groupByValues,
agentInstanceContext,
groupView.getViews()[0]);
} else {
// For each child node
ArrayList<View> subViewList = new ArrayList<View>(4);
subviewHolder = subViewList;
for (View originalChildView : groupView.getViews()) {
View copyChildView =
copyChildView(
groupView, propertyNames, groupByValues, agentInstanceContext, originalChildView);
subViewList.add(copyChildView);
}
}
return subviewHolder;
}
private static View copyChildView(
GroupByView groupView,
String[] propertyNames,
Object groupByValues,
AgentInstanceViewFactoryChainContext agentInstanceContext,
View originalChildView) {
if (originalChildView instanceof MergeView) {
String message = "Unexpected merge view as child of group-by view";
log.fatal(".copySubViews " + message);
throw new EPException(message);
}
if (!(originalChildView instanceof CloneableView)) {
throw new EPException(
"Unexpected error copying subview " + originalChildView.getClass().getName());
}
CloneableView cloneableView = (CloneableView) originalChildView;
// Copy child node
View copyChildView = cloneableView.cloneView();
copyChildView.setParent(groupView);
// Make the sub views for child copying from the original to the child
copySubViews(
groupView.getCriteriaExpressions(),
propertyNames,
groupByValues,
originalChildView,
copyChildView,
agentInstanceContext);
return copyChildView;
}