boolean push()

in maven-resolver-util/src/main/java/org/eclipse/aether/util/graph/transformer/ConflictResolver.java [641:700]
57 lines of code
13 McCabe index (conditional complexity)

        boolean push(DependencyNode node, Object conflictId) throws RepositoryException {
            if (conflictId == null) {
                if (node.getDependency() != null) {
                    if (node.getData().get(NODE_DATA_WINNER) != null) {
                        return false;
                    }
                    throw new RepositoryException("missing conflict id for node " + node);
                }
            } else if (!potentialAncestorIds.contains(conflictId)) {
                return false;
            }

            List<DependencyNode> graphNode = node.getChildren();
            if (stack.put(graphNode, Boolean.TRUE) != null) {
                return false;
            }

            int depth = depth();
            String scope = deriveScope(node, conflictId);
            boolean optional = deriveOptional(node, conflictId);
            NodeInfo info = infos.get(graphNode);
            if (info == null) {
                info = new NodeInfo(depth, scope, optional);
                infos.put(graphNode, info);
                parentInfos.add(info);
                parentNodes.add(node);
                parentScopes.add(scope);
                parentOptionals.add(optional);
            } else {
                int changes = info.update(depth, scope, optional);
                if (changes == 0) {
                    stack.remove(graphNode);
                    return false;
                }
                parentInfos.add(null); // disable creating new conflict items, we update the existing ones below
                parentNodes.add(node);
                parentScopes.add(scope);
                parentOptionals.add(optional);
                if (info.children != null) {
                    if ((changes & NodeInfo.CHANGE_SCOPE) != 0) {
                        ListIterator<ConflictItem> itemIterator = info.children.listIterator(info.children.size());
                        while (itemIterator.hasPrevious()) {
                            ConflictItem item = itemIterator.previous();
                            String childScope = deriveScope(item.node, null);
                            item.addScope(childScope);
                        }
                    }
                    if ((changes & NodeInfo.CHANGE_OPTIONAL) != 0) {
                        ListIterator<ConflictItem> itemIterator = info.children.listIterator(info.children.size());
                        while (itemIterator.hasPrevious()) {
                            ConflictItem item = itemIterator.previous();
                            boolean childOptional = deriveOptional(item.node, null);
                            item.addOptional(childOptional);
                        }
                    }
                }
            }

            return true;
        }