public void mergConfigurations()

in log4j-core/src/main/java/org/apache/logging/log4j/core/config/composite/DefaultMergeStrategy.java [130:241]
108 lines of code
28 McCabe index (conditional complexity)

    public void mergConfigurations(final Node target, final Node source, final PluginManager pluginManager) {
        for (final Node sourceChildNode : source.getChildren()) {
            final boolean isFilter = isFilterNode(sourceChildNode);
            boolean isMerged = false;
            for (final Node targetChildNode : target.getChildren()) {
                if (isFilter) {
                    if (isFilterNode(targetChildNode)) {
                        updateFilterNode(target, targetChildNode, sourceChildNode, pluginManager);
                        isMerged = true;
                        break;
                    }
                    continue;
                }

                if (!targetChildNode.getName().equalsIgnoreCase(sourceChildNode.getName())) {
                    continue;
                }

                switch (toRootLowerCase(targetChildNode.getName())) {
                    case PROPERTIES:
                    case SCRIPTS:
                    case APPENDERS: {
                        for (final Node node : sourceChildNode.getChildren()) {
                            for (final Node targetNode : targetChildNode.getChildren()) {
                                if (Objects.equals(targetNode.getAttributes().get(NAME), node.getAttributes().get(NAME))) {
                                    targetChildNode.getChildren().remove(targetNode);
                                    break;
                                }
                            }
                            targetChildNode.getChildren().add(node);
                        }
                        isMerged = true;
                        break;
                    }
                    case LOGGERS: {
                        final Map<String, Node> targetLoggers = new HashMap<>();
                        for (final Node node : targetChildNode.getChildren()) {
                            targetLoggers.put(node.getName(), node);
                        }
                        for (final Node node : sourceChildNode.getChildren()) {
                            final Node targetNode = getLoggerNode(targetChildNode, node.getAttributes().get(NAME));
                            final Node loggerNode = new Node(targetChildNode, node.getName(), node.getType());
                            if (targetNode != null) {
                                targetNode.getAttributes().putAll(node.getAttributes());
                                for (final Node sourceLoggerChild : node.getChildren()) {
                                    if (isFilterNode(sourceLoggerChild)) {
                                        boolean foundFilter = false;
                                        for (final Node targetChild : targetNode.getChildren()) {
                                            if (isFilterNode(targetChild)) {
                                                updateFilterNode(loggerNode, targetChild, sourceLoggerChild,
                                                        pluginManager);
                                                foundFilter = true;
                                                break;
                                            }
                                        }
                                        if (!foundFilter) {
                                            final Node childNode = new Node(loggerNode, sourceLoggerChild.getName(),
                                                    sourceLoggerChild.getType());
                                            childNode.getAttributes().putAll(sourceLoggerChild.getAttributes());
                                            childNode.getChildren().addAll(sourceLoggerChild.getChildren());
                                            targetNode.getChildren().add(childNode);
                                        }
                                    } else {
                                        final Node childNode = new Node(loggerNode, sourceLoggerChild.getName(),
                                                sourceLoggerChild.getType());
                                        childNode.getAttributes().putAll(sourceLoggerChild.getAttributes());
                                        childNode.getChildren().addAll(sourceLoggerChild.getChildren());
                                        if (childNode.getName().equalsIgnoreCase("AppenderRef")) {
                                            for (final Node targetChild : targetNode.getChildren()) {
                                                if (isSameReference(targetChild, childNode)) {
                                                    targetNode.getChildren().remove(targetChild);
                                                    break;
                                                }
                                            }
                                        } else {
                                            for (final Node targetChild : targetNode.getChildren()) {
                                                if (isSameName(targetChild, childNode)) {
                                                    targetNode.getChildren().remove(targetChild);
                                                    break;
                                                }
                                            }
                                        }

                                        targetNode.getChildren().add(childNode);
                                    }
                                }
                            } else {
                                loggerNode.getAttributes().putAll(node.getAttributes());
                                loggerNode.getChildren().addAll(node.getChildren());
                                targetChildNode.getChildren().add(loggerNode);
                            }
                        }
                        isMerged = true;
                        break;
                    }
                    default: {
                        targetChildNode.getChildren().addAll(sourceChildNode.getChildren());
                        isMerged = true;
                        break;
                    }

                }
            }
            if (!isMerged) {
                if (sourceChildNode.getName().equalsIgnoreCase("Properties")) {
                    target.getChildren().add(0, sourceChildNode);
                } else {
                    target.getChildren().add(sourceChildNode);
                }
            }
        }
    }