protected Object convert()

in xstream/src/java/com/thoughtworks/xstream/core/AbstractReferenceUnmarshaller.java [45:86]
41 lines of code
12 McCabe index (conditional complexity)

    protected Object convert(final Object parent, final Class<?> type, final Converter converter) {
        if (parentStack.size() > 0) { // handles circular references
            final R parentReferenceKey = parentStack.peek();
            if (parentReferenceKey != null) {
                // see AbstractCircularReferenceTest.testWeirdCircularReference()
                if (!values.containsKey(parentReferenceKey)) {
                    values.put(parentReferenceKey, parent);
                }
            }
        }
        final Object result;
        final String attributeName = getMapper().aliasForSystemAttribute("reference");
        final String reference = attributeName == null ? null : reader.getAttribute(attributeName);
        final boolean isReferenceable = getMapper().isReferenceable(type);
        if (reference != null) {
            final Object cache = isReferenceable ? values.get(getReferenceKey(reference)) : null;
            if (cache == null) {
                final ConversionException ex = new ConversionException("Invalid reference");
                ex.add("reference", reference);
                ex.add("referenced-type", type.getName());
                ex.add("referenceable", Boolean.toString(isReferenceable));
                throw ex;
            }
            result = cache == NULL ? null : cache;
        } else if (!isReferenceable) {
            result = super.convert(parent, type, converter);
        } else {
            final R currentReferenceKey = getCurrentReferenceKey();
            parentStack.push(currentReferenceKey);
            Object localResult = null;
            try {
                localResult = super.convert(parent, type, converter);
            } finally {
                result = localResult;
                if (currentReferenceKey != null) {
                    values.put(currentReferenceKey, result == null ? NULL : result);
                }
                parentStack.popSilently();
            }
        }
        return result;
    }