private String replaceAnnotationAttributes()

in bval-jsr/src/main/java/org/apache/bval/jsr/DefaultMessageInterpolator.java [279:321]
43 lines of code
10 McCabe index (conditional complexity)

    private String replaceAnnotationAttributes(final String message, final Map<String, Object> annotationParameters) {
        final MessageWithParamsKey key = new MessageWithParamsKey(message, annotationParameters);
        String result = interpolations.get(key);
        if (result == null) {
            final Matcher matcher = MESSAGE_PARAMETER.matcher(message);
            if (!matcher.find()) {
                result = message;
            } else {
                final StringBuilder sb = new StringBuilder(64);
                int prev = 0;
                do {
                    int start = matcher.start();
                    String resolvedParameterValue;
                    String parameter = matcher.group(1);
                    Object variable = annotationParameters.get(parameter);
                    if (variable == null) {
                        resolvedParameterValue = matcher.group();
                    } else if (Object[].class.isInstance(variable)) {
                        resolvedParameterValue = Arrays.toString((Object[]) variable);
                    } else if (variable.getClass().isArray()) {
                        try {
                            resolvedParameterValue = (String) getToStringMethod(variable).invoke(null, variable);
                        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
                            throw new IllegalStateException("Could not expand array " + variable);
                        }
                    } else {
                        resolvedParameterValue = variable.toString();
                    }
                    if (start > prev) {
                        sb.append(message, prev, start);
                    }
                    sb.append(resolvedParameterValue);
                    prev = matcher.end();
                } while (matcher.find());
                if (prev < message.length()) {
                    sb.append(message, prev, message.length());
                }
                result = sb.toString();
            }
            interpolations.putIfAbsent(key, result);
        }
        return result;
    }