private static Map<String, GraphNode<?>> makeSafeGraphNodeMapCopy(
Map<String, GraphNode<?>> graphNodeMap) {
if (graphNodeMap == null) {
return null;
}
final HashMap<String, GraphNode<?>> copy =
new HashMap<String, GraphNode<?>>(CollectionHelper.determineProperSizing(graphNodeMap));
for (Map.Entry<String, GraphNode<?>> attributeNodeEntry : graphNodeMap.entrySet()) {
copy.put(attributeNodeEntry.getKey(), attributeNodeEntry.getValue().makeImmutableCopy());
}
return copy;
}
/**
* Package-protected method to centralize checking of criteria query multi-selects as defined by
* the {@link CriteriaQuery#multiselect(List)} method.
*
* @param selections The selection varargs to check
* @throws IllegalArgumentException If the selection items are not valid per {@link
* CriteriaQuery#multiselect} documentation. <i>"An argument to the multiselect method
* must not be a tuple- or array-valued compound selection item."</i>
*/
void checkMultiselect(List<Selection<?>> selections) {
final HashSet<String> aliases =
new HashSet<String>(CollectionHelper.determineProperSizing(selections.size()));
for (Selection<?> selection : selections) {
if (selection.isCompoundSelection()) {
if (selection.getJavaType().isArray()) {
throw new IllegalArgumentException(
"Selection items in a multi-select cannot contain compound array-valued elements");
}
if (Tuple.class.isAssignableFrom(selection.getJavaType())) {
throw new IllegalArgumentException(
"Selection items in a multi-select cannot contain compound tuple-valued elements");
}
}
if (StringHelper.isNotEmpty(selection.getAlias())) {
boolean added = aliases.add(selection.getAlias());
if (!added) {
throw new IllegalArgumentException(
"Multi-select expressions defined duplicate alias : " + selection.getAlias());
}
}
}
}