private void appendStructuredElements()

in log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java [363:418]
48 lines of code
17 McCabe index (conditional complexity)

    private void appendStructuredElements(final StringBuilder buffer, final LogEvent event) {
        final Message message = event.getMessage();
        final boolean isStructured = message instanceof StructuredDataMessage ||
                message instanceof StructuredDataCollectionMessage;

        if (!isStructured && (fieldFormatters != null && fieldFormatters.isEmpty()) && !includeMdc) {
            buffer.append('-');
            return;
        }

        final Map<String, StructuredDataElement> sdElements = new HashMap<>();
        final Map<String, String> contextMap = event.getContextData().toMap();

        if (mdcRequired != null) {
            checkRequired(contextMap);
        }

        if (fieldFormatters != null) {
            for (final Map.Entry<String, FieldFormatter> sdElement : fieldFormatters.entrySet()) {
                final String sdId = sdElement.getKey();
                final StructuredDataElement elem = sdElement.getValue().format(event);
                sdElements.put(sdId, elem);
            }
        }

        if (includeMdc && contextMap.size() > 0) {
            final String mdcSdIdStr = mdcSdId.toString();
            final StructuredDataElement union = sdElements.get(mdcSdIdStr);
            if (union != null) {
                union.union(contextMap);
                sdElements.put(mdcSdIdStr, union);
            } else {
                final StructuredDataElement formattedContextMap = new StructuredDataElement(contextMap, mdcPrefix, false);
                sdElements.put(mdcSdIdStr, formattedContextMap);
            }
        }

        if (isStructured) {
            if (message instanceof MessageCollectionMessage) {
                for (final StructuredDataMessage data : ((StructuredDataCollectionMessage)message)) {
                    addStructuredData(sdElements, data);
                }
            } else {
                addStructuredData(sdElements, (StructuredDataMessage) message);
            }
        }

        if (sdElements.isEmpty()) {
            buffer.append('-');
            return;
        }

        for (final Map.Entry<String, StructuredDataElement> entry : sdElements.entrySet()) {
            formatStructuredElement(entry.getKey(), entry.getValue(), buffer, listChecker);
        }
    }